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https://github.com/c64scene-ar/llvm-6502.git
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42e8630239
definition below all of the header #include lines, lib/Target/... edition. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206842 91177308-0d34-0410-b5e6-96231b3b80d8
7271 lines
275 KiB
C++
7271 lines
275 KiB
C++
//===-- ARM64ISelLowering.cpp - ARM64 DAG Lowering Implementation --------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the ARM64TargetLowering class.
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//
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//===----------------------------------------------------------------------===//
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#include "ARM64ISelLowering.h"
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#include "ARM64PerfectShuffle.h"
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#include "ARM64Subtarget.h"
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#include "ARM64CallingConv.h"
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#include "ARM64MachineFunctionInfo.h"
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#include "ARM64TargetMachine.h"
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#include "ARM64TargetObjectFile.h"
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#include "MCTargetDesc/ARM64AddressingModes.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/CodeGen/CallingConvLower.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Type.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetOptions.h"
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using namespace llvm;
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#define DEBUG_TYPE "arm64-lower"
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STATISTIC(NumTailCalls, "Number of tail calls");
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STATISTIC(NumShiftInserts, "Number of vector shift inserts");
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// This option should go away when tail calls fully work.
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static cl::opt<bool>
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EnableARM64TailCalls("arm64-tail-calls", cl::Hidden,
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cl::desc("Generate ARM64 tail calls (TEMPORARY OPTION)."),
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cl::init(true));
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static cl::opt<bool>
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StrictAlign("arm64-strict-align", cl::Hidden,
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cl::desc("Disallow all unaligned memory accesses"));
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// Place holder until extr generation is tested fully.
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static cl::opt<bool>
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EnableARM64ExtrGeneration("arm64-extr-generation", cl::Hidden,
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cl::desc("Allow ARM64 (or (shift)(shift))->extract"),
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cl::init(true));
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static cl::opt<bool>
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EnableARM64SlrGeneration("arm64-shift-insert-generation", cl::Hidden,
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cl::desc("Allow ARM64 SLI/SRI formation"),
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cl::init(false));
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//===----------------------------------------------------------------------===//
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// ARM64 Lowering public interface.
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//===----------------------------------------------------------------------===//
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static TargetLoweringObjectFile *createTLOF(TargetMachine &TM) {
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if (TM.getSubtarget<ARM64Subtarget>().isTargetDarwin())
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return new ARM64_MachoTargetObjectFile();
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return new ARM64_ELFTargetObjectFile();
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}
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ARM64TargetLowering::ARM64TargetLowering(ARM64TargetMachine &TM)
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: TargetLowering(TM, createTLOF(TM)) {
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Subtarget = &TM.getSubtarget<ARM64Subtarget>();
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// ARM64 doesn't have comparisons which set GPRs or setcc instructions, so
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// we have to make something up. Arbitrarily, choose ZeroOrOne.
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setBooleanContents(ZeroOrOneBooleanContent);
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// When comparing vectors the result sets the different elements in the
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// vector to all-one or all-zero.
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setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
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// Set up the register classes.
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addRegisterClass(MVT::i32, &ARM64::GPR32allRegClass);
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addRegisterClass(MVT::i64, &ARM64::GPR64allRegClass);
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addRegisterClass(MVT::f16, &ARM64::FPR16RegClass);
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addRegisterClass(MVT::f32, &ARM64::FPR32RegClass);
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addRegisterClass(MVT::f64, &ARM64::FPR64RegClass);
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addRegisterClass(MVT::f128, &ARM64::FPR128RegClass);
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addRegisterClass(MVT::v16i8, &ARM64::FPR8RegClass);
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addRegisterClass(MVT::v8i16, &ARM64::FPR16RegClass);
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// Someone set us up the NEON.
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addDRTypeForNEON(MVT::v2f32);
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addDRTypeForNEON(MVT::v8i8);
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addDRTypeForNEON(MVT::v4i16);
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addDRTypeForNEON(MVT::v2i32);
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addDRTypeForNEON(MVT::v1i64);
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addDRTypeForNEON(MVT::v1f64);
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addQRTypeForNEON(MVT::v4f32);
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addQRTypeForNEON(MVT::v2f64);
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addQRTypeForNEON(MVT::v16i8);
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addQRTypeForNEON(MVT::v8i16);
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addQRTypeForNEON(MVT::v4i32);
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addQRTypeForNEON(MVT::v2i64);
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// Compute derived properties from the register classes
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computeRegisterProperties();
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// Provide all sorts of operation actions
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setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
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setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
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setOperationAction(ISD::SETCC, MVT::i32, Custom);
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setOperationAction(ISD::SETCC, MVT::i64, Custom);
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setOperationAction(ISD::SETCC, MVT::f32, Custom);
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setOperationAction(ISD::SETCC, MVT::f64, Custom);
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setOperationAction(ISD::BRCOND, MVT::Other, Expand);
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setOperationAction(ISD::BR_CC, MVT::i32, Custom);
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setOperationAction(ISD::BR_CC, MVT::i64, Custom);
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setOperationAction(ISD::BR_CC, MVT::f32, Custom);
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setOperationAction(ISD::BR_CC, MVT::f64, Custom);
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setOperationAction(ISD::SELECT, MVT::i32, Custom);
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setOperationAction(ISD::SELECT, MVT::i64, Custom);
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setOperationAction(ISD::SELECT, MVT::f32, Custom);
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setOperationAction(ISD::SELECT, MVT::f64, Custom);
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setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
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setOperationAction(ISD::SELECT_CC, MVT::i64, Custom);
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setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
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setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
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setOperationAction(ISD::BR_JT, MVT::Other, Expand);
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setOperationAction(ISD::JumpTable, MVT::i64, Custom);
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setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
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setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
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setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
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setOperationAction(ISD::FREM, MVT::f32, Expand);
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setOperationAction(ISD::FREM, MVT::f64, Expand);
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setOperationAction(ISD::FREM, MVT::f80, Expand);
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// FIXME: v1f64 shouldn't be legal if we can avoid it, because it leads to
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// silliness like this:
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setOperationAction(ISD::FABS, MVT::v1f64, Expand);
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setOperationAction(ISD::FADD, MVT::v1f64, Expand);
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setOperationAction(ISD::FCEIL, MVT::v1f64, Expand);
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setOperationAction(ISD::FCOPYSIGN, MVT::v1f64, Expand);
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setOperationAction(ISD::FCOS, MVT::v1f64, Expand);
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setOperationAction(ISD::FDIV, MVT::v1f64, Expand);
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setOperationAction(ISD::FFLOOR, MVT::v1f64, Expand);
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setOperationAction(ISD::FMA, MVT::v1f64, Expand);
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setOperationAction(ISD::FMUL, MVT::v1f64, Expand);
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setOperationAction(ISD::FNEARBYINT, MVT::v1f64, Expand);
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setOperationAction(ISD::FNEG, MVT::v1f64, Expand);
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setOperationAction(ISD::FPOW, MVT::v1f64, Expand);
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setOperationAction(ISD::FREM, MVT::v1f64, Expand);
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setOperationAction(ISD::FROUND, MVT::v1f64, Expand);
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setOperationAction(ISD::FRINT, MVT::v1f64, Expand);
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setOperationAction(ISD::FSIN, MVT::v1f64, Expand);
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setOperationAction(ISD::FSINCOS, MVT::v1f64, Expand);
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setOperationAction(ISD::FSQRT, MVT::v1f64, Expand);
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setOperationAction(ISD::FSUB, MVT::v1f64, Expand);
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setOperationAction(ISD::FTRUNC, MVT::v1f64, Expand);
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setOperationAction(ISD::SETCC, MVT::v1f64, Expand);
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setOperationAction(ISD::BR_CC, MVT::v1f64, Expand);
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setOperationAction(ISD::SELECT, MVT::v1f64, Expand);
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setOperationAction(ISD::SELECT_CC, MVT::v1f64, Expand);
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setOperationAction(ISD::FP_EXTEND, MVT::v1f64, Expand);
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setOperationAction(ISD::FP_TO_SINT, MVT::v1i64, Expand);
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setOperationAction(ISD::FP_TO_UINT, MVT::v1i64, Expand);
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setOperationAction(ISD::SINT_TO_FP, MVT::v1i64, Expand);
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setOperationAction(ISD::UINT_TO_FP, MVT::v1i64, Expand);
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setOperationAction(ISD::FP_ROUND, MVT::v1f64, Expand);
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setOperationAction(ISD::MUL, MVT::v1i64, Expand);
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// Custom lowering hooks are needed for XOR
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// to fold it into CSINC/CSINV.
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setOperationAction(ISD::XOR, MVT::i32, Custom);
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setOperationAction(ISD::XOR, MVT::i64, Custom);
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// Virtually no operation on f128 is legal, but LLVM can't expand them when
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// there's a valid register class, so we need custom operations in most cases.
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setOperationAction(ISD::FABS, MVT::f128, Expand);
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setOperationAction(ISD::FADD, MVT::f128, Custom);
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setOperationAction(ISD::FCOPYSIGN, MVT::f128, Expand);
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setOperationAction(ISD::FCOS, MVT::f128, Expand);
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setOperationAction(ISD::FDIV, MVT::f128, Custom);
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setOperationAction(ISD::FMA, MVT::f128, Expand);
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setOperationAction(ISD::FMUL, MVT::f128, Custom);
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setOperationAction(ISD::FNEG, MVT::f128, Expand);
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setOperationAction(ISD::FPOW, MVT::f128, Expand);
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setOperationAction(ISD::FREM, MVT::f128, Expand);
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setOperationAction(ISD::FRINT, MVT::f128, Expand);
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setOperationAction(ISD::FSIN, MVT::f128, Expand);
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setOperationAction(ISD::FSINCOS, MVT::f128, Expand);
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setOperationAction(ISD::FSQRT, MVT::f128, Expand);
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setOperationAction(ISD::FSUB, MVT::f128, Custom);
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setOperationAction(ISD::FTRUNC, MVT::f128, Expand);
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setOperationAction(ISD::SETCC, MVT::f128, Custom);
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setOperationAction(ISD::BR_CC, MVT::f128, Custom);
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setOperationAction(ISD::SELECT, MVT::f128, Custom);
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setOperationAction(ISD::SELECT_CC, MVT::f128, Custom);
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setOperationAction(ISD::FP_EXTEND, MVT::f128, Custom);
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// Lowering for many of the conversions is actually specified by the non-f128
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// type. The LowerXXX function will be trivial when f128 isn't involved.
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setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
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setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
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setOperationAction(ISD::FP_TO_SINT, MVT::i128, Custom);
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setOperationAction(ISD::FP_TO_UINT, MVT::i32, Custom);
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setOperationAction(ISD::FP_TO_UINT, MVT::i64, Custom);
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setOperationAction(ISD::FP_TO_UINT, MVT::i128, Custom);
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setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
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setOperationAction(ISD::SINT_TO_FP, MVT::i64, Custom);
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setOperationAction(ISD::SINT_TO_FP, MVT::i128, Custom);
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setOperationAction(ISD::UINT_TO_FP, MVT::i32, Custom);
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setOperationAction(ISD::UINT_TO_FP, MVT::i64, Custom);
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setOperationAction(ISD::UINT_TO_FP, MVT::i128, Custom);
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setOperationAction(ISD::FP_ROUND, MVT::f32, Custom);
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setOperationAction(ISD::FP_ROUND, MVT::f64, Custom);
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// Variable arguments.
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setOperationAction(ISD::VASTART, MVT::Other, Custom);
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setOperationAction(ISD::VAARG, MVT::Other, Custom);
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setOperationAction(ISD::VACOPY, MVT::Other, Custom);
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setOperationAction(ISD::VAEND, MVT::Other, Expand);
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// Variable-sized objects.
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setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
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setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
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setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
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// Exception handling.
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// FIXME: These are guesses. Has this been defined yet?
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setExceptionPointerRegister(ARM64::X0);
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setExceptionSelectorRegister(ARM64::X1);
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// Constant pool entries
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setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
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// BlockAddress
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setOperationAction(ISD::BlockAddress, MVT::i64, Custom);
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// Add/Sub overflow ops with MVT::Glues are lowered to CPSR dependences.
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setOperationAction(ISD::ADDC, MVT::i32, Custom);
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setOperationAction(ISD::ADDE, MVT::i32, Custom);
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setOperationAction(ISD::SUBC, MVT::i32, Custom);
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setOperationAction(ISD::SUBE, MVT::i32, Custom);
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setOperationAction(ISD::ADDC, MVT::i64, Custom);
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setOperationAction(ISD::ADDE, MVT::i64, Custom);
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setOperationAction(ISD::SUBC, MVT::i64, Custom);
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setOperationAction(ISD::SUBE, MVT::i64, Custom);
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// ARM64 lacks both left-rotate and popcount instructions.
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setOperationAction(ISD::ROTL, MVT::i32, Expand);
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setOperationAction(ISD::ROTL, MVT::i64, Expand);
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// ARM64 doesn't have a direct vector ->f32 conversion instructions for
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// elements smaller than i32, so promote the input to i32 first.
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setOperationAction(ISD::UINT_TO_FP, MVT::v4i8, Promote);
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setOperationAction(ISD::SINT_TO_FP, MVT::v4i8, Promote);
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setOperationAction(ISD::UINT_TO_FP, MVT::v4i16, Promote);
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setOperationAction(ISD::SINT_TO_FP, MVT::v4i16, Promote);
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// Similarly, there is no direct i32 -> f64 vector conversion instruction.
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setOperationAction(ISD::SINT_TO_FP, MVT::v2i32, Custom);
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setOperationAction(ISD::UINT_TO_FP, MVT::v2i32, Custom);
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setOperationAction(ISD::SINT_TO_FP, MVT::v2i64, Custom);
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setOperationAction(ISD::UINT_TO_FP, MVT::v2i64, Custom);
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// ARM64 doesn't have {U|S}MUL_LOHI.
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setOperationAction(ISD::UMUL_LOHI, MVT::i64, Expand);
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setOperationAction(ISD::SMUL_LOHI, MVT::i64, Expand);
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// ARM64 doesn't have MUL.2d:
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setOperationAction(ISD::MUL, MVT::v2i64, Expand);
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// Expand the undefined-at-zero variants to cttz/ctlz to their defined-at-zero
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// counterparts, which ARM64 supports directly.
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setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
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setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
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setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
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setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
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setOperationAction(ISD::CTPOP, MVT::i32, Custom);
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setOperationAction(ISD::CTPOP, MVT::i64, Custom);
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setOperationAction(ISD::SDIVREM, MVT::i32, Expand);
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setOperationAction(ISD::SDIVREM, MVT::i64, Expand);
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setOperationAction(ISD::SREM, MVT::i32, Expand);
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setOperationAction(ISD::SREM, MVT::i64, Expand);
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setOperationAction(ISD::UDIVREM, MVT::i32, Expand);
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setOperationAction(ISD::UDIVREM, MVT::i64, Expand);
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setOperationAction(ISD::UREM, MVT::i32, Expand);
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setOperationAction(ISD::UREM, MVT::i64, Expand);
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// Custom lower Add/Sub/Mul with overflow.
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setOperationAction(ISD::SADDO, MVT::i32, Custom);
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setOperationAction(ISD::SADDO, MVT::i64, Custom);
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setOperationAction(ISD::UADDO, MVT::i32, Custom);
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setOperationAction(ISD::UADDO, MVT::i64, Custom);
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setOperationAction(ISD::SSUBO, MVT::i32, Custom);
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setOperationAction(ISD::SSUBO, MVT::i64, Custom);
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setOperationAction(ISD::USUBO, MVT::i32, Custom);
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setOperationAction(ISD::USUBO, MVT::i64, Custom);
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setOperationAction(ISD::SMULO, MVT::i32, Custom);
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setOperationAction(ISD::SMULO, MVT::i64, Custom);
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setOperationAction(ISD::UMULO, MVT::i32, Custom);
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setOperationAction(ISD::UMULO, MVT::i64, Custom);
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setOperationAction(ISD::FSIN, MVT::f32, Expand);
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setOperationAction(ISD::FSIN, MVT::f64, Expand);
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setOperationAction(ISD::FCOS, MVT::f32, Expand);
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setOperationAction(ISD::FCOS, MVT::f64, Expand);
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setOperationAction(ISD::FPOW, MVT::f32, Expand);
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setOperationAction(ISD::FPOW, MVT::f64, Expand);
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setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
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setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
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// ARM64 has implementations of a lot of rounding-like FP operations.
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static MVT RoundingTypes[] = { MVT::f32, MVT::f64, MVT::v2f32,
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MVT::v4f32, MVT::v2f64 };
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for (unsigned I = 0; I < array_lengthof(RoundingTypes); ++I) {
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MVT Ty = RoundingTypes[I];
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setOperationAction(ISD::FFLOOR, Ty, Legal);
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setOperationAction(ISD::FNEARBYINT, Ty, Legal);
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setOperationAction(ISD::FCEIL, Ty, Legal);
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setOperationAction(ISD::FRINT, Ty, Legal);
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setOperationAction(ISD::FTRUNC, Ty, Legal);
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setOperationAction(ISD::FROUND, Ty, Legal);
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}
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setOperationAction(ISD::PREFETCH, MVT::Other, Custom);
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if (Subtarget->isTargetMachO()) {
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// For iOS, we don't want to the normal expansion of a libcall to
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// sincos. We want to issue a libcall to __sincos_stret to avoid memory
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// traffic.
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setOperationAction(ISD::FSINCOS, MVT::f64, Custom);
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setOperationAction(ISD::FSINCOS, MVT::f32, Custom);
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} else {
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setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
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setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
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}
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// ARM64 does not have floating-point extending loads, i1 sign-extending load,
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// floating-point truncating stores, or v2i32->v2i16 truncating store.
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setLoadExtAction(ISD::EXTLOAD, MVT::f32, Expand);
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setLoadExtAction(ISD::EXTLOAD, MVT::f64, Expand);
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setLoadExtAction(ISD::EXTLOAD, MVT::f80, Expand);
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setLoadExtAction(ISD::SEXTLOAD, MVT::i1, Expand);
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setTruncStoreAction(MVT::f32, MVT::f16, Expand);
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setTruncStoreAction(MVT::f64, MVT::f32, Expand);
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setTruncStoreAction(MVT::f64, MVT::f16, Expand);
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setTruncStoreAction(MVT::f128, MVT::f80, Expand);
|
|
setTruncStoreAction(MVT::f128, MVT::f64, Expand);
|
|
setTruncStoreAction(MVT::f128, MVT::f32, Expand);
|
|
setTruncStoreAction(MVT::f128, MVT::f16, Expand);
|
|
setTruncStoreAction(MVT::v2i32, MVT::v2i16, Expand);
|
|
// Indexed loads and stores are supported.
|
|
for (unsigned im = (unsigned)ISD::PRE_INC;
|
|
im != (unsigned)ISD::LAST_INDEXED_MODE; ++im) {
|
|
setIndexedLoadAction(im, MVT::i8, Legal);
|
|
setIndexedLoadAction(im, MVT::i16, Legal);
|
|
setIndexedLoadAction(im, MVT::i32, Legal);
|
|
setIndexedLoadAction(im, MVT::i64, Legal);
|
|
setIndexedLoadAction(im, MVT::f64, Legal);
|
|
setIndexedLoadAction(im, MVT::f32, Legal);
|
|
setIndexedStoreAction(im, MVT::i8, Legal);
|
|
setIndexedStoreAction(im, MVT::i16, Legal);
|
|
setIndexedStoreAction(im, MVT::i32, Legal);
|
|
setIndexedStoreAction(im, MVT::i64, Legal);
|
|
setIndexedStoreAction(im, MVT::f64, Legal);
|
|
setIndexedStoreAction(im, MVT::f32, Legal);
|
|
}
|
|
|
|
// Likewise, narrowing and extending vector loads/stores aren't handled
|
|
// directly.
|
|
for (unsigned VT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
|
|
VT <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++VT) {
|
|
|
|
setOperationAction(ISD::SIGN_EXTEND_INREG, (MVT::SimpleValueType)VT,
|
|
Expand);
|
|
|
|
for (unsigned InnerVT = (unsigned)MVT::FIRST_VECTOR_VALUETYPE;
|
|
InnerVT <= (unsigned)MVT::LAST_VECTOR_VALUETYPE; ++InnerVT)
|
|
setTruncStoreAction((MVT::SimpleValueType)VT,
|
|
(MVT::SimpleValueType)InnerVT, Expand);
|
|
setLoadExtAction(ISD::SEXTLOAD, (MVT::SimpleValueType)VT, Expand);
|
|
setLoadExtAction(ISD::ZEXTLOAD, (MVT::SimpleValueType)VT, Expand);
|
|
setLoadExtAction(ISD::EXTLOAD, (MVT::SimpleValueType)VT, Expand);
|
|
}
|
|
|
|
// Trap.
|
|
setOperationAction(ISD::TRAP, MVT::Other, Legal);
|
|
setOperationAction(ISD::ANY_EXTEND, MVT::v4i32, Legal);
|
|
|
|
// We combine OR nodes for bitfield operations.
|
|
setTargetDAGCombine(ISD::OR);
|
|
|
|
// Vector add and sub nodes may conceal a high-half opportunity.
|
|
// Also, try to fold ADD into CSINC/CSINV..
|
|
setTargetDAGCombine(ISD::ADD);
|
|
setTargetDAGCombine(ISD::SUB);
|
|
|
|
setTargetDAGCombine(ISD::XOR);
|
|
setTargetDAGCombine(ISD::SINT_TO_FP);
|
|
setTargetDAGCombine(ISD::UINT_TO_FP);
|
|
|
|
setTargetDAGCombine(ISD::INTRINSIC_WO_CHAIN);
|
|
|
|
setTargetDAGCombine(ISD::ANY_EXTEND);
|
|
setTargetDAGCombine(ISD::ZERO_EXTEND);
|
|
setTargetDAGCombine(ISD::SIGN_EXTEND);
|
|
setTargetDAGCombine(ISD::BITCAST);
|
|
setTargetDAGCombine(ISD::CONCAT_VECTORS);
|
|
setTargetDAGCombine(ISD::STORE);
|
|
|
|
setTargetDAGCombine(ISD::MUL);
|
|
|
|
setTargetDAGCombine(ISD::VSELECT);
|
|
|
|
MaxStoresPerMemset = MaxStoresPerMemsetOptSize = 8;
|
|
MaxStoresPerMemcpy = MaxStoresPerMemcpyOptSize = 4;
|
|
MaxStoresPerMemmove = MaxStoresPerMemmoveOptSize = 4;
|
|
|
|
setStackPointerRegisterToSaveRestore(ARM64::SP);
|
|
|
|
setSchedulingPreference(Sched::Hybrid);
|
|
|
|
// Enable TBZ/TBNZ
|
|
MaskAndBranchFoldingIsLegal = true;
|
|
|
|
setMinFunctionAlignment(2);
|
|
|
|
setDivIsWellDefined(true);
|
|
|
|
RequireStrictAlign = StrictAlign;
|
|
|
|
setHasExtractBitsInsn(true);
|
|
}
|
|
|
|
void ARM64TargetLowering::addTypeForNEON(EVT VT, EVT PromotedBitwiseVT) {
|
|
if (VT == MVT::v2f32) {
|
|
setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
|
|
AddPromotedToType(ISD::LOAD, VT.getSimpleVT(), MVT::v2i32);
|
|
|
|
setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
|
|
AddPromotedToType(ISD::STORE, VT.getSimpleVT(), MVT::v2i32);
|
|
} else if (VT == MVT::v2f64 || VT == MVT::v4f32) {
|
|
setOperationAction(ISD::LOAD, VT.getSimpleVT(), Promote);
|
|
AddPromotedToType(ISD::LOAD, VT.getSimpleVT(), MVT::v2i64);
|
|
|
|
setOperationAction(ISD::STORE, VT.getSimpleVT(), Promote);
|
|
AddPromotedToType(ISD::STORE, VT.getSimpleVT(), MVT::v2i64);
|
|
}
|
|
|
|
// Mark vector float intrinsics as expand.
|
|
if (VT == MVT::v2f32 || VT == MVT::v4f32 || VT == MVT::v2f64) {
|
|
setOperationAction(ISD::FSIN, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FCOS, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FPOWI, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FPOW, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FLOG, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FLOG2, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FLOG10, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FEXP, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FEXP2, VT.getSimpleVT(), Expand);
|
|
}
|
|
|
|
setOperationAction(ISD::EXTRACT_VECTOR_ELT, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::INSERT_VECTOR_ELT, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::BUILD_VECTOR, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::VECTOR_SHUFFLE, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::EXTRACT_SUBVECTOR, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::SRA, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::SRL, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::SHL, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::AND, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::OR, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::SETCC, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::CONCAT_VECTORS, VT.getSimpleVT(), Legal);
|
|
|
|
setOperationAction(ISD::SELECT, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::SELECT_CC, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::VSELECT, VT.getSimpleVT(), Expand);
|
|
setLoadExtAction(ISD::EXTLOAD, VT.getSimpleVT(), Expand);
|
|
|
|
// CNT supports only B element sizes.
|
|
if (VT != MVT::v8i8 && VT != MVT::v16i8)
|
|
setOperationAction(ISD::CTPOP, VT.getSimpleVT(), Expand);
|
|
|
|
setOperationAction(ISD::UDIV, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::SDIV, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::UREM, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::SREM, VT.getSimpleVT(), Expand);
|
|
setOperationAction(ISD::FREM, VT.getSimpleVT(), Expand);
|
|
|
|
setOperationAction(ISD::FP_TO_SINT, VT.getSimpleVT(), Custom);
|
|
setOperationAction(ISD::FP_TO_UINT, VT.getSimpleVT(), Custom);
|
|
}
|
|
|
|
void ARM64TargetLowering::addDRTypeForNEON(MVT VT) {
|
|
addRegisterClass(VT, &ARM64::FPR64RegClass);
|
|
addTypeForNEON(VT, MVT::v2i32);
|
|
}
|
|
|
|
void ARM64TargetLowering::addQRTypeForNEON(MVT VT) {
|
|
addRegisterClass(VT, &ARM64::FPR128RegClass);
|
|
addTypeForNEON(VT, MVT::v4i32);
|
|
}
|
|
|
|
EVT ARM64TargetLowering::getSetCCResultType(LLVMContext &, EVT VT) const {
|
|
if (!VT.isVector())
|
|
return MVT::i32;
|
|
return VT.changeVectorElementTypeToInteger();
|
|
}
|
|
|
|
/// computeMaskedBitsForTargetNode - Determine which of the bits specified in
|
|
/// Mask are known to be either zero or one and return them in the
|
|
/// KnownZero/KnownOne bitsets.
|
|
void ARM64TargetLowering::computeMaskedBitsForTargetNode(
|
|
const SDValue Op, APInt &KnownZero, APInt &KnownOne,
|
|
const SelectionDAG &DAG, unsigned Depth) const {
|
|
switch (Op.getOpcode()) {
|
|
default:
|
|
break;
|
|
case ARM64ISD::CSEL: {
|
|
APInt KnownZero2, KnownOne2;
|
|
DAG.ComputeMaskedBits(Op->getOperand(0), KnownZero, KnownOne, Depth + 1);
|
|
DAG.ComputeMaskedBits(Op->getOperand(1), KnownZero2, KnownOne2, Depth + 1);
|
|
KnownZero &= KnownZero2;
|
|
KnownOne &= KnownOne2;
|
|
break;
|
|
}
|
|
case ISD::INTRINSIC_W_CHAIN: {
|
|
ConstantSDNode *CN = cast<ConstantSDNode>(Op->getOperand(1));
|
|
Intrinsic::ID IntID = static_cast<Intrinsic::ID>(CN->getZExtValue());
|
|
switch (IntID) {
|
|
default: return;
|
|
case Intrinsic::arm64_ldaxr:
|
|
case Intrinsic::arm64_ldxr: {
|
|
unsigned BitWidth = KnownOne.getBitWidth();
|
|
EVT VT = cast<MemIntrinsicSDNode>(Op)->getMemoryVT();
|
|
unsigned MemBits = VT.getScalarType().getSizeInBits();
|
|
KnownZero |= APInt::getHighBitsSet(BitWidth, BitWidth - MemBits);
|
|
return;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
case ISD::INTRINSIC_WO_CHAIN:
|
|
case ISD::INTRINSIC_VOID: {
|
|
unsigned IntNo = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
|
|
switch (IntNo) {
|
|
default:
|
|
break;
|
|
case Intrinsic::arm64_neon_umaxv:
|
|
case Intrinsic::arm64_neon_uminv: {
|
|
// Figure out the datatype of the vector operand. The UMINV instruction
|
|
// will zero extend the result, so we can mark as known zero all the
|
|
// bits larger than the element datatype. 32-bit or larget doesn't need
|
|
// this as those are legal types and will be handled by isel directly.
|
|
MVT VT = Op.getOperand(1).getValueType().getSimpleVT();
|
|
unsigned BitWidth = KnownZero.getBitWidth();
|
|
if (VT == MVT::v8i8 || VT == MVT::v16i8) {
|
|
assert(BitWidth >= 8 && "Unexpected width!");
|
|
APInt Mask = APInt::getHighBitsSet(BitWidth, BitWidth - 8);
|
|
KnownZero |= Mask;
|
|
} else if (VT == MVT::v4i16 || VT == MVT::v8i16) {
|
|
assert(BitWidth >= 16 && "Unexpected width!");
|
|
APInt Mask = APInt::getHighBitsSet(BitWidth, BitWidth - 16);
|
|
KnownZero |= Mask;
|
|
}
|
|
break;
|
|
} break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
MVT ARM64TargetLowering::getScalarShiftAmountTy(EVT LHSTy) const {
|
|
return MVT::i64;
|
|
}
|
|
|
|
unsigned ARM64TargetLowering::getMaximalGlobalOffset() const {
|
|
// FIXME: On ARM64, this depends on the type.
|
|
// Basically, the addressable offsets are o to 4095 * Ty.getSizeInBytes().
|
|
// and the offset has to be a multiple of the related size in bytes.
|
|
return 4095;
|
|
}
|
|
|
|
FastISel *
|
|
ARM64TargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
|
|
const TargetLibraryInfo *libInfo) const {
|
|
return ARM64::createFastISel(funcInfo, libInfo);
|
|
}
|
|
|
|
const char *ARM64TargetLowering::getTargetNodeName(unsigned Opcode) const {
|
|
switch (Opcode) {
|
|
default:
|
|
return 0;
|
|
case ARM64ISD::CALL: return "ARM64ISD::CALL";
|
|
case ARM64ISD::ADRP: return "ARM64ISD::ADRP";
|
|
case ARM64ISD::ADDlow: return "ARM64ISD::ADDlow";
|
|
case ARM64ISD::LOADgot: return "ARM64ISD::LOADgot";
|
|
case ARM64ISD::RET_FLAG: return "ARM64ISD::RET_FLAG";
|
|
case ARM64ISD::BRCOND: return "ARM64ISD::BRCOND";
|
|
case ARM64ISD::CSEL: return "ARM64ISD::CSEL";
|
|
case ARM64ISD::FCSEL: return "ARM64ISD::FCSEL";
|
|
case ARM64ISD::CSINV: return "ARM64ISD::CSINV";
|
|
case ARM64ISD::CSNEG: return "ARM64ISD::CSNEG";
|
|
case ARM64ISD::CSINC: return "ARM64ISD::CSINC";
|
|
case ARM64ISD::THREAD_POINTER: return "ARM64ISD::THREAD_POINTER";
|
|
case ARM64ISD::TLSDESC_CALL: return "ARM64ISD::TLSDESC_CALL";
|
|
case ARM64ISD::ADC: return "ARM64ISD::ADC";
|
|
case ARM64ISD::SBC: return "ARM64ISD::SBC";
|
|
case ARM64ISD::ADDS: return "ARM64ISD::ADDS";
|
|
case ARM64ISD::SUBS: return "ARM64ISD::SUBS";
|
|
case ARM64ISD::ADCS: return "ARM64ISD::ADCS";
|
|
case ARM64ISD::SBCS: return "ARM64ISD::SBCS";
|
|
case ARM64ISD::ANDS: return "ARM64ISD::ANDS";
|
|
case ARM64ISD::FCMP: return "ARM64ISD::FCMP";
|
|
case ARM64ISD::FMIN: return "ARM64ISD::FMIN";
|
|
case ARM64ISD::FMAX: return "ARM64ISD::FMAX";
|
|
case ARM64ISD::DUP: return "ARM64ISD::DUP";
|
|
case ARM64ISD::DUPLANE8: return "ARM64ISD::DUPLANE8";
|
|
case ARM64ISD::DUPLANE16: return "ARM64ISD::DUPLANE16";
|
|
case ARM64ISD::DUPLANE32: return "ARM64ISD::DUPLANE32";
|
|
case ARM64ISD::DUPLANE64: return "ARM64ISD::DUPLANE64";
|
|
case ARM64ISD::MOVI: return "ARM64ISD::MOVI";
|
|
case ARM64ISD::MOVIshift: return "ARM64ISD::MOVIshift";
|
|
case ARM64ISD::MOVIedit: return "ARM64ISD::MOVIedit";
|
|
case ARM64ISD::MOVImsl: return "ARM64ISD::MOVImsl";
|
|
case ARM64ISD::FMOV: return "ARM64ISD::FMOV";
|
|
case ARM64ISD::MVNIshift: return "ARM64ISD::MVNIshift";
|
|
case ARM64ISD::MVNImsl: return "ARM64ISD::MVNImsl";
|
|
case ARM64ISD::BICi: return "ARM64ISD::BICi";
|
|
case ARM64ISD::ORRi: return "ARM64ISD::ORRi";
|
|
case ARM64ISD::BSL: return "ARM64ISD::BSL";
|
|
case ARM64ISD::NEG: return "ARM64ISD::NEG";
|
|
case ARM64ISD::EXTR: return "ARM64ISD::EXTR";
|
|
case ARM64ISD::ZIP1: return "ARM64ISD::ZIP1";
|
|
case ARM64ISD::ZIP2: return "ARM64ISD::ZIP2";
|
|
case ARM64ISD::UZP1: return "ARM64ISD::UZP1";
|
|
case ARM64ISD::UZP2: return "ARM64ISD::UZP2";
|
|
case ARM64ISD::TRN1: return "ARM64ISD::TRN1";
|
|
case ARM64ISD::TRN2: return "ARM64ISD::TRN2";
|
|
case ARM64ISD::REV16: return "ARM64ISD::REV16";
|
|
case ARM64ISD::REV32: return "ARM64ISD::REV32";
|
|
case ARM64ISD::REV64: return "ARM64ISD::REV64";
|
|
case ARM64ISD::EXT: return "ARM64ISD::EXT";
|
|
case ARM64ISD::VSHL: return "ARM64ISD::VSHL";
|
|
case ARM64ISD::VLSHR: return "ARM64ISD::VLSHR";
|
|
case ARM64ISD::VASHR: return "ARM64ISD::VASHR";
|
|
case ARM64ISD::CMEQ: return "ARM64ISD::CMEQ";
|
|
case ARM64ISD::CMGE: return "ARM64ISD::CMGE";
|
|
case ARM64ISD::CMGT: return "ARM64ISD::CMGT";
|
|
case ARM64ISD::CMHI: return "ARM64ISD::CMHI";
|
|
case ARM64ISD::CMHS: return "ARM64ISD::CMHS";
|
|
case ARM64ISD::FCMEQ: return "ARM64ISD::FCMEQ";
|
|
case ARM64ISD::FCMGE: return "ARM64ISD::FCMGE";
|
|
case ARM64ISD::FCMGT: return "ARM64ISD::FCMGT";
|
|
case ARM64ISD::CMEQz: return "ARM64ISD::CMEQz";
|
|
case ARM64ISD::CMGEz: return "ARM64ISD::CMGEz";
|
|
case ARM64ISD::CMGTz: return "ARM64ISD::CMGTz";
|
|
case ARM64ISD::CMLEz: return "ARM64ISD::CMLEz";
|
|
case ARM64ISD::CMLTz: return "ARM64ISD::CMLTz";
|
|
case ARM64ISD::FCMEQz: return "ARM64ISD::FCMEQz";
|
|
case ARM64ISD::FCMGEz: return "ARM64ISD::FCMGEz";
|
|
case ARM64ISD::FCMGTz: return "ARM64ISD::FCMGTz";
|
|
case ARM64ISD::FCMLEz: return "ARM64ISD::FCMLEz";
|
|
case ARM64ISD::FCMLTz: return "ARM64ISD::FCMLTz";
|
|
case ARM64ISD::NOT: return "ARM64ISD::NOT";
|
|
case ARM64ISD::BIT: return "ARM64ISD::BIT";
|
|
case ARM64ISD::CBZ: return "ARM64ISD::CBZ";
|
|
case ARM64ISD::CBNZ: return "ARM64ISD::CBNZ";
|
|
case ARM64ISD::TBZ: return "ARM64ISD::TBZ";
|
|
case ARM64ISD::TBNZ: return "ARM64ISD::TBNZ";
|
|
case ARM64ISD::TC_RETURN: return "ARM64ISD::TC_RETURN";
|
|
case ARM64ISD::SITOF: return "ARM64ISD::SITOF";
|
|
case ARM64ISD::UITOF: return "ARM64ISD::UITOF";
|
|
case ARM64ISD::SQSHL_I: return "ARM64ISD::SQSHL_I";
|
|
case ARM64ISD::UQSHL_I: return "ARM64ISD::UQSHL_I";
|
|
case ARM64ISD::SRSHR_I: return "ARM64ISD::SRSHR_I";
|
|
case ARM64ISD::URSHR_I: return "ARM64ISD::URSHR_I";
|
|
case ARM64ISD::SQSHLU_I: return "ARM64ISD::SQSHLU_I";
|
|
case ARM64ISD::WrapperLarge: return "ARM64ISD::WrapperLarge";
|
|
}
|
|
}
|
|
|
|
MachineBasicBlock *
|
|
ARM64TargetLowering::EmitF128CSEL(MachineInstr *MI,
|
|
MachineBasicBlock *MBB) const {
|
|
// We materialise the F128CSEL pseudo-instruction as some control flow and a
|
|
// phi node:
|
|
|
|
// OrigBB:
|
|
// [... previous instrs leading to comparison ...]
|
|
// b.ne TrueBB
|
|
// b EndBB
|
|
// TrueBB:
|
|
// ; Fallthrough
|
|
// EndBB:
|
|
// Dest = PHI [IfTrue, TrueBB], [IfFalse, OrigBB]
|
|
|
|
const TargetInstrInfo *TII = getTargetMachine().getInstrInfo();
|
|
MachineFunction *MF = MBB->getParent();
|
|
const BasicBlock *LLVM_BB = MBB->getBasicBlock();
|
|
DebugLoc DL = MI->getDebugLoc();
|
|
MachineFunction::iterator It = MBB;
|
|
++It;
|
|
|
|
unsigned DestReg = MI->getOperand(0).getReg();
|
|
unsigned IfTrueReg = MI->getOperand(1).getReg();
|
|
unsigned IfFalseReg = MI->getOperand(2).getReg();
|
|
unsigned CondCode = MI->getOperand(3).getImm();
|
|
bool CPSRKilled = MI->getOperand(4).isKill();
|
|
|
|
MachineBasicBlock *TrueBB = MF->CreateMachineBasicBlock(LLVM_BB);
|
|
MachineBasicBlock *EndBB = MF->CreateMachineBasicBlock(LLVM_BB);
|
|
MF->insert(It, TrueBB);
|
|
MF->insert(It, EndBB);
|
|
|
|
// Transfer rest of current basic-block to EndBB
|
|
EndBB->splice(EndBB->begin(), MBB, std::next(MachineBasicBlock::iterator(MI)),
|
|
MBB->end());
|
|
EndBB->transferSuccessorsAndUpdatePHIs(MBB);
|
|
|
|
BuildMI(MBB, DL, TII->get(ARM64::Bcc)).addImm(CondCode).addMBB(TrueBB);
|
|
BuildMI(MBB, DL, TII->get(ARM64::B)).addMBB(EndBB);
|
|
MBB->addSuccessor(TrueBB);
|
|
MBB->addSuccessor(EndBB);
|
|
|
|
// TrueBB falls through to the end.
|
|
TrueBB->addSuccessor(EndBB);
|
|
|
|
if (!CPSRKilled) {
|
|
TrueBB->addLiveIn(ARM64::CPSR);
|
|
EndBB->addLiveIn(ARM64::CPSR);
|
|
}
|
|
|
|
BuildMI(*EndBB, EndBB->begin(), DL, TII->get(ARM64::PHI), DestReg)
|
|
.addReg(IfTrueReg)
|
|
.addMBB(TrueBB)
|
|
.addReg(IfFalseReg)
|
|
.addMBB(MBB);
|
|
|
|
MI->eraseFromParent();
|
|
return EndBB;
|
|
}
|
|
|
|
MachineBasicBlock *
|
|
ARM64TargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
|
|
MachineBasicBlock *BB) const {
|
|
switch (MI->getOpcode()) {
|
|
default:
|
|
#ifndef NDEBUG
|
|
MI->dump();
|
|
#endif
|
|
assert(0 && "Unexpected instruction for custom inserter!");
|
|
break;
|
|
|
|
case ARM64::F128CSEL:
|
|
return EmitF128CSEL(MI, BB);
|
|
|
|
case TargetOpcode::STACKMAP:
|
|
case TargetOpcode::PATCHPOINT:
|
|
return emitPatchPoint(MI, BB);
|
|
}
|
|
llvm_unreachable("Unexpected instruction for custom inserter!");
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ARM64 Lowering private implementation.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Lowering Code
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// changeIntCCToARM64CC - Convert a DAG integer condition code to an ARM64 CC
|
|
static ARM64CC::CondCode changeIntCCToARM64CC(ISD::CondCode CC) {
|
|
switch (CC) {
|
|
default:
|
|
llvm_unreachable("Unknown condition code!");
|
|
case ISD::SETNE:
|
|
return ARM64CC::NE;
|
|
case ISD::SETEQ:
|
|
return ARM64CC::EQ;
|
|
case ISD::SETGT:
|
|
return ARM64CC::GT;
|
|
case ISD::SETGE:
|
|
return ARM64CC::GE;
|
|
case ISD::SETLT:
|
|
return ARM64CC::LT;
|
|
case ISD::SETLE:
|
|
return ARM64CC::LE;
|
|
case ISD::SETUGT:
|
|
return ARM64CC::HI;
|
|
case ISD::SETUGE:
|
|
return ARM64CC::CS;
|
|
case ISD::SETULT:
|
|
return ARM64CC::CC;
|
|
case ISD::SETULE:
|
|
return ARM64CC::LS;
|
|
}
|
|
}
|
|
|
|
/// changeFPCCToARM64CC - Convert a DAG fp condition code to an ARM64 CC.
|
|
static void changeFPCCToARM64CC(ISD::CondCode CC, ARM64CC::CondCode &CondCode,
|
|
ARM64CC::CondCode &CondCode2) {
|
|
CondCode2 = ARM64CC::AL;
|
|
switch (CC) {
|
|
default:
|
|
llvm_unreachable("Unknown FP condition!");
|
|
case ISD::SETEQ:
|
|
case ISD::SETOEQ:
|
|
CondCode = ARM64CC::EQ;
|
|
break;
|
|
case ISD::SETGT:
|
|
case ISD::SETOGT:
|
|
CondCode = ARM64CC::GT;
|
|
break;
|
|
case ISD::SETGE:
|
|
case ISD::SETOGE:
|
|
CondCode = ARM64CC::GE;
|
|
break;
|
|
case ISD::SETOLT:
|
|
CondCode = ARM64CC::MI;
|
|
break;
|
|
case ISD::SETOLE:
|
|
CondCode = ARM64CC::LS;
|
|
break;
|
|
case ISD::SETONE:
|
|
CondCode = ARM64CC::MI;
|
|
CondCode2 = ARM64CC::GT;
|
|
break;
|
|
case ISD::SETO:
|
|
CondCode = ARM64CC::VC;
|
|
break;
|
|
case ISD::SETUO:
|
|
CondCode = ARM64CC::VS;
|
|
break;
|
|
case ISD::SETUEQ:
|
|
CondCode = ARM64CC::EQ;
|
|
CondCode2 = ARM64CC::VS;
|
|
break;
|
|
case ISD::SETUGT:
|
|
CondCode = ARM64CC::HI;
|
|
break;
|
|
case ISD::SETUGE:
|
|
CondCode = ARM64CC::PL;
|
|
break;
|
|
case ISD::SETLT:
|
|
case ISD::SETULT:
|
|
CondCode = ARM64CC::LT;
|
|
break;
|
|
case ISD::SETLE:
|
|
case ISD::SETULE:
|
|
CondCode = ARM64CC::LE;
|
|
break;
|
|
case ISD::SETNE:
|
|
case ISD::SETUNE:
|
|
CondCode = ARM64CC::NE;
|
|
break;
|
|
}
|
|
}
|
|
|
|
/// changeVectorFPCCToARM64CC - Convert a DAG fp condition code to an ARM64 CC
|
|
/// usable with the vector instructions. Fewer operations are available without
|
|
/// a real NZCV register, so we have to use less efficient combinations to get
|
|
/// the same effect.
|
|
static void changeVectorFPCCToARM64CC(ISD::CondCode CC,
|
|
ARM64CC::CondCode &CondCode,
|
|
ARM64CC::CondCode &CondCode2,
|
|
bool &Invert) {
|
|
Invert = false;
|
|
switch (CC) {
|
|
default:
|
|
// Mostly the scalar mappings work fine.
|
|
changeFPCCToARM64CC(CC, CondCode, CondCode2);
|
|
break;
|
|
case ISD::SETUO:
|
|
Invert = true; // Fallthrough
|
|
case ISD::SETO:
|
|
CondCode = ARM64CC::MI;
|
|
CondCode2 = ARM64CC::GE;
|
|
break;
|
|
case ISD::SETUEQ:
|
|
case ISD::SETULT:
|
|
case ISD::SETULE:
|
|
case ISD::SETUGT:
|
|
case ISD::SETUGE:
|
|
// All of the compare-mask comparisons are ordered, but we can switch
|
|
// between the two by a double inversion. E.g. ULE == !OGT.
|
|
Invert = true;
|
|
changeFPCCToARM64CC(getSetCCInverse(CC, false), CondCode, CondCode2);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static bool isLegalArithImmed(uint64_t C) {
|
|
// Matches ARM64DAGToDAGISel::SelectArithImmed().
|
|
return (C >> 12 == 0) || ((C & 0xFFFULL) == 0 && C >> 24 == 0);
|
|
}
|
|
|
|
static SDValue emitComparison(SDValue LHS, SDValue RHS, ISD::CondCode CC,
|
|
SDLoc dl, SelectionDAG &DAG) {
|
|
EVT VT = LHS.getValueType();
|
|
|
|
if (VT.isFloatingPoint())
|
|
return DAG.getNode(ARM64ISD::FCMP, dl, VT, LHS, RHS);
|
|
|
|
// The CMP instruction is just an alias for SUBS, and representing it as
|
|
// SUBS means that it's possible to get CSE with subtract operations.
|
|
// A later phase can perform the optimization of setting the destination
|
|
// register to WZR/XZR if it ends up being unused.
|
|
|
|
// We'd like to combine a (CMP op1, (sub 0, op2) into a CMN instruction on the
|
|
// grounds that "op1 - (-op2) == op1 + op2". However, the C and V flags can be
|
|
// set differently by this operation. It comes down to whether "SInt(~op2)+1
|
|
// == SInt(~op2+1)" (and the same for UInt). If they are then everything is
|
|
// fine. If not then the optimization is wrong. Thus general comparisons are
|
|
// only valid if op2 != 0.
|
|
|
|
// So, finally, the only LLVM-native comparisons that don't mention C and V
|
|
// are SETEQ and SETNE. They're the only ones we can safely use CMN for in the
|
|
// absence of information about op2.
|
|
unsigned Opcode = ARM64ISD::SUBS;
|
|
if (RHS.getOpcode() == ISD::SUB && isa<ConstantSDNode>(RHS.getOperand(0)) &&
|
|
cast<ConstantSDNode>(RHS.getOperand(0))->getZExtValue() == 0 &&
|
|
(CC == ISD::SETEQ || CC == ISD::SETNE)) {
|
|
Opcode = ARM64ISD::ADDS;
|
|
RHS = RHS.getOperand(1);
|
|
}
|
|
|
|
return DAG.getNode(Opcode, dl, DAG.getVTList(VT, MVT::i32), LHS, RHS)
|
|
.getValue(1);
|
|
}
|
|
|
|
static SDValue getARM64Cmp(SDValue LHS, SDValue RHS, ISD::CondCode CC,
|
|
SDValue &ARM64cc, SelectionDAG &DAG, SDLoc dl) {
|
|
if (ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS.getNode())) {
|
|
EVT VT = RHS.getValueType();
|
|
uint64_t C = RHSC->getZExtValue();
|
|
if (!isLegalArithImmed(C)) {
|
|
// Constant does not fit, try adjusting it by one?
|
|
switch (CC) {
|
|
default:
|
|
break;
|
|
case ISD::SETLT:
|
|
case ISD::SETGE:
|
|
if ((VT == MVT::i32 && C != 0x80000000 &&
|
|
isLegalArithImmed((uint32_t)(C - 1))) ||
|
|
(VT == MVT::i64 && C != 0x80000000ULL &&
|
|
isLegalArithImmed(C - 1ULL))) {
|
|
CC = (CC == ISD::SETLT) ? ISD::SETLE : ISD::SETGT;
|
|
C = (VT == MVT::i32) ? (uint32_t)(C - 1) : C - 1;
|
|
RHS = DAG.getConstant(C, VT);
|
|
}
|
|
break;
|
|
case ISD::SETULT:
|
|
case ISD::SETUGE:
|
|
if ((VT == MVT::i32 && C != 0 &&
|
|
isLegalArithImmed((uint32_t)(C - 1))) ||
|
|
(VT == MVT::i64 && C != 0ULL && isLegalArithImmed(C - 1ULL))) {
|
|
CC = (CC == ISD::SETULT) ? ISD::SETULE : ISD::SETUGT;
|
|
C = (VT == MVT::i32) ? (uint32_t)(C - 1) : C - 1;
|
|
RHS = DAG.getConstant(C, VT);
|
|
}
|
|
break;
|
|
case ISD::SETLE:
|
|
case ISD::SETGT:
|
|
if ((VT == MVT::i32 && C != 0x7fffffff &&
|
|
isLegalArithImmed((uint32_t)(C + 1))) ||
|
|
(VT == MVT::i64 && C != 0x7ffffffffffffffULL &&
|
|
isLegalArithImmed(C + 1ULL))) {
|
|
CC = (CC == ISD::SETLE) ? ISD::SETLT : ISD::SETGE;
|
|
C = (VT == MVT::i32) ? (uint32_t)(C + 1) : C + 1;
|
|
RHS = DAG.getConstant(C, VT);
|
|
}
|
|
break;
|
|
case ISD::SETULE:
|
|
case ISD::SETUGT:
|
|
if ((VT == MVT::i32 && C != 0xffffffff &&
|
|
isLegalArithImmed((uint32_t)(C + 1))) ||
|
|
(VT == MVT::i64 && C != 0xfffffffffffffffULL &&
|
|
isLegalArithImmed(C + 1ULL))) {
|
|
CC = (CC == ISD::SETULE) ? ISD::SETULT : ISD::SETUGE;
|
|
C = (VT == MVT::i32) ? (uint32_t)(C + 1) : C + 1;
|
|
RHS = DAG.getConstant(C, VT);
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
|
|
ARM64CC::CondCode ARM64CC = changeIntCCToARM64CC(CC);
|
|
ARM64cc = DAG.getConstant(ARM64CC, MVT::i32);
|
|
return Cmp;
|
|
}
|
|
|
|
static std::pair<SDValue, SDValue>
|
|
getARM64XALUOOp(ARM64CC::CondCode &CC, SDValue Op, SelectionDAG &DAG) {
|
|
assert((Op.getValueType() == MVT::i32 || Op.getValueType() == MVT::i64) &&
|
|
"Unsupported value type");
|
|
SDValue Value, Overflow;
|
|
SDLoc DL(Op);
|
|
SDValue LHS = Op.getOperand(0);
|
|
SDValue RHS = Op.getOperand(1);
|
|
unsigned Opc = 0;
|
|
switch (Op.getOpcode()) {
|
|
default:
|
|
llvm_unreachable("Unknown overflow instruction!");
|
|
case ISD::SADDO:
|
|
Opc = ARM64ISD::ADDS;
|
|
CC = ARM64CC::VS;
|
|
break;
|
|
case ISD::UADDO:
|
|
Opc = ARM64ISD::ADDS;
|
|
CC = ARM64CC::CS;
|
|
break;
|
|
case ISD::SSUBO:
|
|
Opc = ARM64ISD::SUBS;
|
|
CC = ARM64CC::VS;
|
|
break;
|
|
case ISD::USUBO:
|
|
Opc = ARM64ISD::SUBS;
|
|
CC = ARM64CC::CC;
|
|
break;
|
|
// Multiply needs a little bit extra work.
|
|
case ISD::SMULO:
|
|
case ISD::UMULO: {
|
|
CC = ARM64CC::NE;
|
|
bool IsSigned = (Op.getOpcode() == ISD::SMULO) ? true : false;
|
|
if (Op.getValueType() == MVT::i32) {
|
|
unsigned ExtendOpc = IsSigned ? ISD::SIGN_EXTEND : ISD::ZERO_EXTEND;
|
|
// For a 32 bit multiply with overflow check we want the instruction
|
|
// selector to generate a widening multiply (SMADDL/UMADDL). For that we
|
|
// need to generate the following pattern:
|
|
// (i64 add 0, (i64 mul (i64 sext|zext i32 %a), (i64 sext|zext i32 %b))
|
|
LHS = DAG.getNode(ExtendOpc, DL, MVT::i64, LHS);
|
|
RHS = DAG.getNode(ExtendOpc, DL, MVT::i64, RHS);
|
|
SDValue Mul = DAG.getNode(ISD::MUL, DL, MVT::i64, LHS, RHS);
|
|
SDValue Add = DAG.getNode(ISD::ADD, DL, MVT::i64, Mul,
|
|
DAG.getConstant(0, MVT::i64));
|
|
// On ARM64 the upper 32 bits are always zero extended for a 32 bit
|
|
// operation. We need to clear out the upper 32 bits, because we used a
|
|
// widening multiply that wrote all 64 bits. In the end this should be a
|
|
// noop.
|
|
Value = DAG.getNode(ISD::TRUNCATE, DL, MVT::i32, Add);
|
|
if (IsSigned) {
|
|
// The signed overflow check requires more than just a simple check for
|
|
// any bit set in the upper 32 bits of the result. These bits could be
|
|
// just the sign bits of a negative number. To perform the overflow
|
|
// check we have to arithmetic shift right the 32nd bit of the result by
|
|
// 31 bits. Then we compare the result to the upper 32 bits.
|
|
SDValue UpperBits = DAG.getNode(ISD::SRL, DL, MVT::i64, Add,
|
|
DAG.getConstant(32, MVT::i64));
|
|
UpperBits = DAG.getNode(ISD::TRUNCATE, DL, MVT::i32, UpperBits);
|
|
SDValue LowerBits = DAG.getNode(ISD::SRA, DL, MVT::i32, Value,
|
|
DAG.getConstant(31, MVT::i64));
|
|
// It is important that LowerBits is last, otherwise the arithmetic
|
|
// shift will not be folded into the compare (SUBS).
|
|
SDVTList VTs = DAG.getVTList(MVT::i32, MVT::i32);
|
|
Overflow = DAG.getNode(ARM64ISD::SUBS, DL, VTs, UpperBits, LowerBits)
|
|
.getValue(1);
|
|
} else {
|
|
// The overflow check for unsigned multiply is easy. We only need to
|
|
// check if any of the upper 32 bits are set. This can be done with a
|
|
// CMP (shifted register). For that we need to generate the following
|
|
// pattern:
|
|
// (i64 ARM64ISD::SUBS i64 0, (i64 srl i64 %Mul, i64 32)
|
|
SDValue UpperBits = DAG.getNode(ISD::SRL, DL, MVT::i64, Mul,
|
|
DAG.getConstant(32, MVT::i64));
|
|
SDVTList VTs = DAG.getVTList(MVT::i64, MVT::i32);
|
|
Overflow =
|
|
DAG.getNode(ARM64ISD::SUBS, DL, VTs, DAG.getConstant(0, MVT::i64),
|
|
UpperBits).getValue(1);
|
|
}
|
|
break;
|
|
}
|
|
assert(Op.getValueType() == MVT::i64 && "Expected an i64 value type");
|
|
// For the 64 bit multiply
|
|
Value = DAG.getNode(ISD::MUL, DL, MVT::i64, LHS, RHS);
|
|
if (IsSigned) {
|
|
SDValue UpperBits = DAG.getNode(ISD::MULHS, DL, MVT::i64, LHS, RHS);
|
|
SDValue LowerBits = DAG.getNode(ISD::SRA, DL, MVT::i64, Value,
|
|
DAG.getConstant(63, MVT::i64));
|
|
// It is important that LowerBits is last, otherwise the arithmetic
|
|
// shift will not be folded into the compare (SUBS).
|
|
SDVTList VTs = DAG.getVTList(MVT::i64, MVT::i32);
|
|
Overflow = DAG.getNode(ARM64ISD::SUBS, DL, VTs, UpperBits, LowerBits)
|
|
.getValue(1);
|
|
} else {
|
|
SDValue UpperBits = DAG.getNode(ISD::MULHU, DL, MVT::i64, LHS, RHS);
|
|
SDVTList VTs = DAG.getVTList(MVT::i64, MVT::i32);
|
|
Overflow =
|
|
DAG.getNode(ARM64ISD::SUBS, DL, VTs, DAG.getConstant(0, MVT::i64),
|
|
UpperBits).getValue(1);
|
|
}
|
|
break;
|
|
}
|
|
} // switch (...)
|
|
|
|
if (Opc) {
|
|
SDVTList VTs = DAG.getVTList(Op->getValueType(0), MVT::i32);
|
|
|
|
// Emit the ARM64 operation with overflow check.
|
|
Value = DAG.getNode(Opc, DL, VTs, LHS, RHS);
|
|
Overflow = Value.getValue(1);
|
|
}
|
|
return std::make_pair(Value, Overflow);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerF128Call(SDValue Op, SelectionDAG &DAG,
|
|
RTLIB::Libcall Call) const {
|
|
SmallVector<SDValue, 2> Ops;
|
|
for (unsigned i = 0, e = Op->getNumOperands(); i != e; ++i)
|
|
Ops.push_back(Op.getOperand(i));
|
|
|
|
return makeLibCall(DAG, Call, MVT::f128, &Ops[0], Ops.size(), false,
|
|
SDLoc(Op)).first;
|
|
}
|
|
|
|
static SDValue LowerXOR(SDValue Op, SelectionDAG &DAG) {
|
|
SDValue Sel = Op.getOperand(0);
|
|
SDValue Other = Op.getOperand(1);
|
|
|
|
// If neither operand is a SELECT_CC, give up.
|
|
if (Sel.getOpcode() != ISD::SELECT_CC)
|
|
std::swap(Sel, Other);
|
|
if (Sel.getOpcode() != ISD::SELECT_CC)
|
|
return Op;
|
|
|
|
// The folding we want to perform is:
|
|
// (xor x, (select_cc a, b, cc, 0, -1) )
|
|
// -->
|
|
// (csel x, (xor x, -1), cc ...)
|
|
//
|
|
// The latter will get matched to a CSINV instruction.
|
|
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(Sel.getOperand(4))->get();
|
|
SDValue LHS = Sel.getOperand(0);
|
|
SDValue RHS = Sel.getOperand(1);
|
|
SDValue TVal = Sel.getOperand(2);
|
|
SDValue FVal = Sel.getOperand(3);
|
|
SDLoc dl(Sel);
|
|
|
|
// FIXME: This could be generalized to non-integer comparisons.
|
|
if (LHS.getValueType() != MVT::i32 && LHS.getValueType() != MVT::i64)
|
|
return Op;
|
|
|
|
ConstantSDNode *CFVal = dyn_cast<ConstantSDNode>(FVal);
|
|
ConstantSDNode *CTVal = dyn_cast<ConstantSDNode>(TVal);
|
|
|
|
// The the values aren't constants, this isn't the pattern we're looking for.
|
|
if (!CFVal || !CTVal)
|
|
return Op;
|
|
|
|
// We can commute the SELECT_CC by inverting the condition. This
|
|
// might be needed to make this fit into a CSINV pattern.
|
|
if (CTVal->isAllOnesValue() && CFVal->isNullValue()) {
|
|
std::swap(TVal, FVal);
|
|
std::swap(CTVal, CFVal);
|
|
CC = ISD::getSetCCInverse(CC, true);
|
|
}
|
|
|
|
// If the constants line up, perform the transform!
|
|
if (CTVal->isNullValue() && CFVal->isAllOnesValue()) {
|
|
SDValue CCVal;
|
|
SDValue Cmp = getARM64Cmp(LHS, RHS, CC, CCVal, DAG, dl);
|
|
|
|
FVal = Other;
|
|
TVal = DAG.getNode(ISD::XOR, dl, Other.getValueType(), Other,
|
|
DAG.getConstant(-1ULL, Other.getValueType()));
|
|
|
|
return DAG.getNode(ARM64ISD::CSEL, dl, Sel.getValueType(), FVal, TVal,
|
|
CCVal, Cmp);
|
|
}
|
|
|
|
return Op;
|
|
}
|
|
|
|
static SDValue LowerADDC_ADDE_SUBC_SUBE(SDValue Op, SelectionDAG &DAG) {
|
|
EVT VT = Op.getValueType();
|
|
|
|
// Let legalize expand this if it isn't a legal type yet.
|
|
if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
|
|
return SDValue();
|
|
|
|
SDVTList VTs = DAG.getVTList(VT, MVT::i32);
|
|
|
|
unsigned Opc;
|
|
bool ExtraOp = false;
|
|
switch (Op.getOpcode()) {
|
|
default:
|
|
assert(0 && "Invalid code");
|
|
case ISD::ADDC:
|
|
Opc = ARM64ISD::ADDS;
|
|
break;
|
|
case ISD::SUBC:
|
|
Opc = ARM64ISD::SUBS;
|
|
break;
|
|
case ISD::ADDE:
|
|
Opc = ARM64ISD::ADCS;
|
|
ExtraOp = true;
|
|
break;
|
|
case ISD::SUBE:
|
|
Opc = ARM64ISD::SBCS;
|
|
ExtraOp = true;
|
|
break;
|
|
}
|
|
|
|
if (!ExtraOp)
|
|
return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0), Op.getOperand(1));
|
|
return DAG.getNode(Opc, SDLoc(Op), VTs, Op.getOperand(0), Op.getOperand(1),
|
|
Op.getOperand(2));
|
|
}
|
|
|
|
static SDValue LowerXALUO(SDValue Op, SelectionDAG &DAG) {
|
|
// Let legalize expand this if it isn't a legal type yet.
|
|
if (!DAG.getTargetLoweringInfo().isTypeLegal(Op.getValueType()))
|
|
return SDValue();
|
|
|
|
ARM64CC::CondCode CC;
|
|
// The actual operation that sets the overflow or carry flag.
|
|
SDValue Value, Overflow;
|
|
std::tie(Value, Overflow) = getARM64XALUOOp(CC, Op, DAG);
|
|
|
|
// We use 0 and 1 as false and true values.
|
|
SDValue TVal = DAG.getConstant(1, MVT::i32);
|
|
SDValue FVal = DAG.getConstant(0, MVT::i32);
|
|
|
|
// We use an inverted condition, because the conditional select is inverted
|
|
// too. This will allow it to be selected to a single instruction:
|
|
// CSINC Wd, WZR, WZR, invert(cond).
|
|
SDValue CCVal = DAG.getConstant(getInvertedCondCode(CC), MVT::i32);
|
|
Overflow = DAG.getNode(ARM64ISD::CSEL, SDLoc(Op), MVT::i32, FVal, TVal, CCVal,
|
|
Overflow);
|
|
|
|
SDVTList VTs = DAG.getVTList(Op.getValueType(), MVT::i32);
|
|
return DAG.getNode(ISD::MERGE_VALUES, SDLoc(Op), VTs, Value, Overflow);
|
|
}
|
|
|
|
// Prefetch operands are:
|
|
// 1: Address to prefetch
|
|
// 2: bool isWrite
|
|
// 3: int locality (0 = no locality ... 3 = extreme locality)
|
|
// 4: bool isDataCache
|
|
static SDValue LowerPREFETCH(SDValue Op, SelectionDAG &DAG) {
|
|
SDLoc DL(Op);
|
|
unsigned IsWrite = cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue();
|
|
unsigned Locality = cast<ConstantSDNode>(Op.getOperand(3))->getZExtValue();
|
|
// The data thing is not used.
|
|
// unsigned isData = cast<ConstantSDNode>(Op.getOperand(4))->getZExtValue();
|
|
|
|
bool IsStream = !Locality;
|
|
// When the locality number is set
|
|
if (Locality) {
|
|
// The front-end should have filtered out the out-of-range values
|
|
assert(Locality <= 3 && "Prefetch locality out-of-range");
|
|
// The locality degree is the opposite of the cache speed.
|
|
// Put the number the other way around.
|
|
// The encoding starts at 0 for level 1
|
|
Locality = 3 - Locality;
|
|
}
|
|
|
|
// built the mask value encoding the expected behavior.
|
|
unsigned PrfOp = (IsWrite << 4) | // Load/Store bit
|
|
(Locality << 1) | // Cache level bits
|
|
(unsigned)IsStream; // Stream bit
|
|
return DAG.getNode(ARM64ISD::PREFETCH, DL, MVT::Other, Op.getOperand(0),
|
|
DAG.getConstant(PrfOp, MVT::i32), Op.getOperand(1));
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerFP_EXTEND(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
assert(Op.getValueType() == MVT::f128 && "Unexpected lowering");
|
|
|
|
RTLIB::Libcall LC;
|
|
LC = RTLIB::getFPEXT(Op.getOperand(0).getValueType(), Op.getValueType());
|
|
|
|
return LowerF128Call(Op, DAG, LC);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerFP_ROUND(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
if (Op.getOperand(0).getValueType() != MVT::f128) {
|
|
// It's legal except when f128 is involved
|
|
return Op;
|
|
}
|
|
|
|
RTLIB::Libcall LC;
|
|
LC = RTLIB::getFPROUND(Op.getOperand(0).getValueType(), Op.getValueType());
|
|
|
|
// FP_ROUND node has a second operand indicating whether it is known to be
|
|
// precise. That doesn't take part in the LibCall so we can't directly use
|
|
// LowerF128Call.
|
|
SDValue SrcVal = Op.getOperand(0);
|
|
return makeLibCall(DAG, LC, Op.getValueType(), &SrcVal, 1,
|
|
/*isSigned*/ false, SDLoc(Op)).first;
|
|
}
|
|
|
|
static SDValue LowerVectorFP_TO_INT(SDValue Op, SelectionDAG &DAG) {
|
|
// Warning: We maintain cost tables in ARM64TargetTransformInfo.cpp.
|
|
// Any additional optimization in this function should be recorded
|
|
// in the cost tables.
|
|
EVT InVT = Op.getOperand(0).getValueType();
|
|
EVT VT = Op.getValueType();
|
|
|
|
// FP_TO_XINT conversion from the same type are legal.
|
|
if (VT.getSizeInBits() == InVT.getSizeInBits())
|
|
return Op;
|
|
|
|
if (InVT == MVT::v2f64 || InVT == MVT::v4f32) {
|
|
SDLoc dl(Op);
|
|
SDValue Cv =
|
|
DAG.getNode(Op.getOpcode(), dl, InVT.changeVectorElementTypeToInteger(),
|
|
Op.getOperand(0));
|
|
return DAG.getNode(ISD::TRUNCATE, dl, VT, Cv);
|
|
} else if (InVT == MVT::v2f32) {
|
|
SDLoc dl(Op);
|
|
SDValue Ext = DAG.getNode(ISD::FP_EXTEND, dl, MVT::v2f64, Op.getOperand(0));
|
|
return DAG.getNode(Op.getOpcode(), dl, VT, Ext);
|
|
}
|
|
|
|
// Type changing conversions are illegal.
|
|
return SDValue();
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerFP_TO_INT(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
if (Op.getOperand(0).getValueType().isVector())
|
|
return LowerVectorFP_TO_INT(Op, DAG);
|
|
|
|
if (Op.getOperand(0).getValueType() != MVT::f128) {
|
|
// It's legal except when f128 is involved
|
|
return Op;
|
|
}
|
|
|
|
RTLIB::Libcall LC;
|
|
if (Op.getOpcode() == ISD::FP_TO_SINT)
|
|
LC = RTLIB::getFPTOSINT(Op.getOperand(0).getValueType(), Op.getValueType());
|
|
else
|
|
LC = RTLIB::getFPTOUINT(Op.getOperand(0).getValueType(), Op.getValueType());
|
|
|
|
SmallVector<SDValue, 2> Ops;
|
|
for (unsigned i = 0, e = Op->getNumOperands(); i != e; ++i)
|
|
Ops.push_back(Op.getOperand(i));
|
|
|
|
return makeLibCall(DAG, LC, Op.getValueType(), &Ops[0], Ops.size(), false,
|
|
SDLoc(Op)).first;
|
|
}
|
|
|
|
static SDValue LowerVectorINT_TO_FP(SDValue Op, SelectionDAG &DAG) {
|
|
// Warning: We maintain cost tables in ARM64TargetTransformInfo.cpp.
|
|
// Any additional optimization in this function should be recorded
|
|
// in the cost tables.
|
|
EVT VT = Op.getValueType();
|
|
SDLoc dl(Op);
|
|
SDValue In = Op.getOperand(0);
|
|
EVT InVT = In.getValueType();
|
|
|
|
// v2i32 to v2f32 is legal.
|
|
if (VT == MVT::v2f32 && InVT == MVT::v2i32)
|
|
return Op;
|
|
|
|
// This function only handles v2f64 outputs.
|
|
if (VT == MVT::v2f64) {
|
|
// Extend the input argument to a v2i64 that we can feed into the
|
|
// floating point conversion. Zero or sign extend based on whether
|
|
// we're doing a signed or unsigned float conversion.
|
|
unsigned Opc =
|
|
Op.getOpcode() == ISD::UINT_TO_FP ? ISD::ZERO_EXTEND : ISD::SIGN_EXTEND;
|
|
assert(Op.getNumOperands() == 1 && "FP conversions take one argument");
|
|
SDValue Promoted = DAG.getNode(Opc, dl, MVT::v2i64, Op.getOperand(0));
|
|
return DAG.getNode(Op.getOpcode(), dl, Op.getValueType(), Promoted);
|
|
}
|
|
|
|
// Scalarize v2i64 to v2f32 conversions.
|
|
std::vector<SDValue> BuildVectorOps;
|
|
for (unsigned i = 0; i < VT.getVectorNumElements(); ++i) {
|
|
SDValue Sclr = DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, MVT::i64, In,
|
|
DAG.getConstant(i, MVT::i64));
|
|
Sclr = DAG.getNode(Op->getOpcode(), dl, MVT::f32, Sclr);
|
|
BuildVectorOps.push_back(Sclr);
|
|
}
|
|
|
|
return DAG.getNode(ISD::BUILD_VECTOR, dl, VT, &BuildVectorOps[0],
|
|
BuildVectorOps.size());
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerINT_TO_FP(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
if (Op.getValueType().isVector())
|
|
return LowerVectorINT_TO_FP(Op, DAG);
|
|
|
|
// i128 conversions are libcalls.
|
|
if (Op.getOperand(0).getValueType() == MVT::i128)
|
|
return SDValue();
|
|
|
|
// Other conversions are legal, unless it's to the completely software-based
|
|
// fp128.
|
|
if (Op.getValueType() != MVT::f128)
|
|
return Op;
|
|
|
|
RTLIB::Libcall LC;
|
|
if (Op.getOpcode() == ISD::SINT_TO_FP)
|
|
LC = RTLIB::getSINTTOFP(Op.getOperand(0).getValueType(), Op.getValueType());
|
|
else
|
|
LC = RTLIB::getUINTTOFP(Op.getOperand(0).getValueType(), Op.getValueType());
|
|
|
|
return LowerF128Call(Op, DAG, LC);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const {
|
|
// For iOS, we want to call an alternative entry point: __sincos_stret,
|
|
// which returns the values in two S / D registers.
|
|
SDLoc dl(Op);
|
|
SDValue Arg = Op.getOperand(0);
|
|
EVT ArgVT = Arg.getValueType();
|
|
Type *ArgTy = ArgVT.getTypeForEVT(*DAG.getContext());
|
|
|
|
ArgListTy Args;
|
|
ArgListEntry Entry;
|
|
|
|
Entry.Node = Arg;
|
|
Entry.Ty = ArgTy;
|
|
Entry.isSExt = false;
|
|
Entry.isZExt = false;
|
|
Args.push_back(Entry);
|
|
|
|
const char *LibcallName =
|
|
(ArgVT == MVT::f64) ? "__sincos_stret" : "__sincosf_stret";
|
|
SDValue Callee = DAG.getExternalSymbol(LibcallName, getPointerTy());
|
|
|
|
StructType *RetTy = StructType::get(ArgTy, ArgTy, NULL);
|
|
TargetLowering::CallLoweringInfo CLI(
|
|
DAG.getEntryNode(), RetTy, false, false, false, false, 0,
|
|
CallingConv::Fast, /*isTaillCall=*/false,
|
|
/*doesNotRet=*/false, /*isReturnValueUsed*/ true, Callee, Args, DAG, dl);
|
|
std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
|
|
return CallResult.first;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerOperation(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
switch (Op.getOpcode()) {
|
|
default:
|
|
llvm_unreachable("unimplemented operand");
|
|
return SDValue();
|
|
case ISD::GlobalAddress:
|
|
return LowerGlobalAddress(Op, DAG);
|
|
case ISD::GlobalTLSAddress:
|
|
return LowerGlobalTLSAddress(Op, DAG);
|
|
case ISD::SETCC:
|
|
return LowerSETCC(Op, DAG);
|
|
case ISD::BR_CC:
|
|
return LowerBR_CC(Op, DAG);
|
|
case ISD::SELECT:
|
|
return LowerSELECT(Op, DAG);
|
|
case ISD::SELECT_CC:
|
|
return LowerSELECT_CC(Op, DAG);
|
|
case ISD::JumpTable:
|
|
return LowerJumpTable(Op, DAG);
|
|
case ISD::ConstantPool:
|
|
return LowerConstantPool(Op, DAG);
|
|
case ISD::BlockAddress:
|
|
return LowerBlockAddress(Op, DAG);
|
|
case ISD::VASTART:
|
|
return LowerVASTART(Op, DAG);
|
|
case ISD::VACOPY:
|
|
return LowerVACOPY(Op, DAG);
|
|
case ISD::VAARG:
|
|
return LowerVAARG(Op, DAG);
|
|
case ISD::ADDC:
|
|
case ISD::ADDE:
|
|
case ISD::SUBC:
|
|
case ISD::SUBE:
|
|
return LowerADDC_ADDE_SUBC_SUBE(Op, DAG);
|
|
case ISD::SADDO:
|
|
case ISD::UADDO:
|
|
case ISD::SSUBO:
|
|
case ISD::USUBO:
|
|
case ISD::SMULO:
|
|
case ISD::UMULO:
|
|
return LowerXALUO(Op, DAG);
|
|
case ISD::FADD:
|
|
return LowerF128Call(Op, DAG, RTLIB::ADD_F128);
|
|
case ISD::FSUB:
|
|
return LowerF128Call(Op, DAG, RTLIB::SUB_F128);
|
|
case ISD::FMUL:
|
|
return LowerF128Call(Op, DAG, RTLIB::MUL_F128);
|
|
case ISD::FDIV:
|
|
return LowerF128Call(Op, DAG, RTLIB::DIV_F128);
|
|
case ISD::FP_ROUND:
|
|
return LowerFP_ROUND(Op, DAG);
|
|
case ISD::FP_EXTEND:
|
|
return LowerFP_EXTEND(Op, DAG);
|
|
case ISD::FRAMEADDR:
|
|
return LowerFRAMEADDR(Op, DAG);
|
|
case ISD::RETURNADDR:
|
|
return LowerRETURNADDR(Op, DAG);
|
|
case ISD::INSERT_VECTOR_ELT:
|
|
return LowerINSERT_VECTOR_ELT(Op, DAG);
|
|
case ISD::EXTRACT_VECTOR_ELT:
|
|
return LowerEXTRACT_VECTOR_ELT(Op, DAG);
|
|
case ISD::BUILD_VECTOR:
|
|
return LowerBUILD_VECTOR(Op, DAG);
|
|
case ISD::VECTOR_SHUFFLE:
|
|
return LowerVECTOR_SHUFFLE(Op, DAG);
|
|
case ISD::EXTRACT_SUBVECTOR:
|
|
return LowerEXTRACT_SUBVECTOR(Op, DAG);
|
|
case ISD::SRA:
|
|
case ISD::SRL:
|
|
case ISD::SHL:
|
|
return LowerVectorSRA_SRL_SHL(Op, DAG);
|
|
case ISD::SHL_PARTS:
|
|
return LowerShiftLeftParts(Op, DAG);
|
|
case ISD::SRL_PARTS:
|
|
case ISD::SRA_PARTS:
|
|
return LowerShiftRightParts(Op, DAG);
|
|
case ISD::CTPOP:
|
|
return LowerCTPOP(Op, DAG);
|
|
case ISD::FCOPYSIGN:
|
|
return LowerFCOPYSIGN(Op, DAG);
|
|
case ISD::AND:
|
|
return LowerVectorAND(Op, DAG);
|
|
case ISD::OR:
|
|
return LowerVectorOR(Op, DAG);
|
|
case ISD::XOR:
|
|
return LowerXOR(Op, DAG);
|
|
case ISD::PREFETCH:
|
|
return LowerPREFETCH(Op, DAG);
|
|
case ISD::SINT_TO_FP:
|
|
case ISD::UINT_TO_FP:
|
|
return LowerINT_TO_FP(Op, DAG);
|
|
case ISD::FP_TO_SINT:
|
|
case ISD::FP_TO_UINT:
|
|
return LowerFP_TO_INT(Op, DAG);
|
|
case ISD::FSINCOS:
|
|
return LowerFSINCOS(Op, DAG);
|
|
}
|
|
}
|
|
|
|
/// getFunctionAlignment - Return the Log2 alignment of this function.
|
|
unsigned ARM64TargetLowering::getFunctionAlignment(const Function *F) const {
|
|
return 2;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Calling Convention Implementation
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "ARM64GenCallingConv.inc"
|
|
|
|
/// Selects the correct CCAssignFn for a the given CallingConvention
|
|
/// value.
|
|
CCAssignFn *ARM64TargetLowering::CCAssignFnForCall(CallingConv::ID CC,
|
|
bool IsVarArg) const {
|
|
switch (CC) {
|
|
default:
|
|
llvm_unreachable("Unsupported calling convention.");
|
|
case CallingConv::WebKit_JS:
|
|
return CC_ARM64_WebKit_JS;
|
|
case CallingConv::C:
|
|
case CallingConv::Fast:
|
|
if (!Subtarget->isTargetDarwin())
|
|
return CC_ARM64_AAPCS;
|
|
return IsVarArg ? CC_ARM64_DarwinPCS_VarArg : CC_ARM64_DarwinPCS;
|
|
}
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerFormalArguments(
|
|
SDValue Chain, CallingConv::ID CallConv, bool isVarArg,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals) const {
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
MachineFrameInfo *MFI = MF.getFrameInfo();
|
|
|
|
// Assign locations to all of the incoming arguments.
|
|
SmallVector<CCValAssign, 16> ArgLocs;
|
|
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
|
|
getTargetMachine(), ArgLocs, *DAG.getContext());
|
|
|
|
// At this point, Ins[].VT may already be promoted to i32. To correctly
|
|
// handle passing i8 as i8 instead of i32 on stack, we pass in both i32 and
|
|
// i8 to CC_ARM64_AAPCS with i32 being ValVT and i8 being LocVT.
|
|
// Since AnalyzeFormalArguments uses Ins[].VT for both ValVT and LocVT, here
|
|
// we use a special version of AnalyzeFormalArguments to pass in ValVT and
|
|
// LocVT.
|
|
unsigned NumArgs = Ins.size();
|
|
Function::const_arg_iterator CurOrigArg = MF.getFunction()->arg_begin();
|
|
unsigned CurArgIdx = 0;
|
|
for (unsigned i = 0; i != NumArgs; ++i) {
|
|
MVT ValVT = Ins[i].VT;
|
|
std::advance(CurOrigArg, Ins[i].OrigArgIndex - CurArgIdx);
|
|
CurArgIdx = Ins[i].OrigArgIndex;
|
|
|
|
// Get type of the original argument.
|
|
EVT ActualVT = getValueType(CurOrigArg->getType(), /*AllowUnknown*/ true);
|
|
MVT ActualMVT = ActualVT.isSimple() ? ActualVT.getSimpleVT() : MVT::Other;
|
|
// If ActualMVT is i1/i8/i16, we should set LocVT to i8/i8/i16.
|
|
MVT LocVT = ValVT;
|
|
if (ActualMVT == MVT::i1 || ActualMVT == MVT::i8)
|
|
LocVT = MVT::i8;
|
|
else if (ActualMVT == MVT::i16)
|
|
LocVT = MVT::i16;
|
|
|
|
CCAssignFn *AssignFn = CCAssignFnForCall(CallConv, /*IsVarArg=*/false);
|
|
bool Res =
|
|
AssignFn(i, ValVT, LocVT, CCValAssign::Full, Ins[i].Flags, CCInfo);
|
|
assert(!Res && "Call operand has unhandled type");
|
|
(void)Res;
|
|
}
|
|
assert(ArgLocs.size() == Ins.size());
|
|
SmallVector<SDValue, 16> ArgValues;
|
|
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
|
|
CCValAssign &VA = ArgLocs[i];
|
|
|
|
if (Ins[i].Flags.isByVal()) {
|
|
// Byval is used for HFAs in the PCS, but the system should work in a
|
|
// non-compliant manner for larger structs.
|
|
EVT PtrTy = getPointerTy();
|
|
int Size = Ins[i].Flags.getByValSize();
|
|
unsigned NumRegs = (Size + 7) / 8;
|
|
|
|
unsigned FrameIdx =
|
|
MFI->CreateFixedObject(8 * NumRegs, VA.getLocMemOffset(), false);
|
|
SDValue FrameIdxN = DAG.getFrameIndex(FrameIdx, PtrTy);
|
|
InVals.push_back(FrameIdxN);
|
|
|
|
continue;
|
|
} if (VA.isRegLoc()) {
|
|
// Arguments stored in registers.
|
|
EVT RegVT = VA.getLocVT();
|
|
|
|
SDValue ArgValue;
|
|
const TargetRegisterClass *RC;
|
|
|
|
if (RegVT == MVT::i32)
|
|
RC = &ARM64::GPR32RegClass;
|
|
else if (RegVT == MVT::i64)
|
|
RC = &ARM64::GPR64RegClass;
|
|
else if (RegVT == MVT::f32)
|
|
RC = &ARM64::FPR32RegClass;
|
|
else if (RegVT == MVT::f64 || RegVT == MVT::v1i64 ||
|
|
RegVT == MVT::v1f64 || RegVT == MVT::v2i32 ||
|
|
RegVT == MVT::v4i16 || RegVT == MVT::v8i8)
|
|
RC = &ARM64::FPR64RegClass;
|
|
else if (RegVT == MVT::v2i64 || RegVT == MVT::v4i32 ||
|
|
RegVT == MVT::v8i16 || RegVT == MVT::v16i8)
|
|
RC = &ARM64::FPR128RegClass;
|
|
else
|
|
llvm_unreachable("RegVT not supported by FORMAL_ARGUMENTS Lowering");
|
|
|
|
// Transform the arguments in physical registers into virtual ones.
|
|
unsigned Reg = MF.addLiveIn(VA.getLocReg(), RC);
|
|
ArgValue = DAG.getCopyFromReg(Chain, DL, Reg, RegVT);
|
|
|
|
// If this is an 8, 16 or 32-bit value, it is really passed promoted
|
|
// to 64 bits. Insert an assert[sz]ext to capture this, then
|
|
// truncate to the right size.
|
|
switch (VA.getLocInfo()) {
|
|
default:
|
|
llvm_unreachable("Unknown loc info!");
|
|
case CCValAssign::Full:
|
|
break;
|
|
case CCValAssign::BCvt:
|
|
ArgValue = DAG.getNode(ISD::BITCAST, DL, VA.getValVT(), ArgValue);
|
|
break;
|
|
case CCValAssign::SExt:
|
|
ArgValue = DAG.getNode(ISD::AssertSext, DL, RegVT, ArgValue,
|
|
DAG.getValueType(VA.getValVT()));
|
|
ArgValue = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), ArgValue);
|
|
break;
|
|
case CCValAssign::ZExt:
|
|
ArgValue = DAG.getNode(ISD::AssertZext, DL, RegVT, ArgValue,
|
|
DAG.getValueType(VA.getValVT()));
|
|
ArgValue = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), ArgValue);
|
|
break;
|
|
}
|
|
|
|
InVals.push_back(ArgValue);
|
|
|
|
} else { // VA.isRegLoc()
|
|
assert(VA.isMemLoc() && "CCValAssign is neither reg nor mem");
|
|
unsigned ArgOffset = VA.getLocMemOffset();
|
|
unsigned ArgSize = VA.getLocVT().getSizeInBits() / 8;
|
|
int FI = MFI->CreateFixedObject(ArgSize, ArgOffset, true);
|
|
|
|
// Create load nodes to retrieve arguments from the stack.
|
|
SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
|
|
InVals.push_back(DAG.getLoad(VA.getValVT(), DL, Chain, FIN,
|
|
MachinePointerInfo::getFixedStack(FI), false,
|
|
false, false, 0));
|
|
}
|
|
}
|
|
|
|
// varargs
|
|
if (isVarArg) {
|
|
if (!Subtarget->isTargetDarwin()) {
|
|
// The AAPCS variadic function ABI is identical to the non-variadic
|
|
// one. As a result there may be more arguments in registers and we should
|
|
// save them for future reference.
|
|
saveVarArgRegisters(CCInfo, DAG, DL, Chain);
|
|
}
|
|
|
|
ARM64FunctionInfo *AFI = MF.getInfo<ARM64FunctionInfo>();
|
|
// This will point to the next argument passed via stack.
|
|
unsigned StackOffset = CCInfo.getNextStackOffset();
|
|
// We currently pass all varargs at 8-byte alignment.
|
|
StackOffset = ((StackOffset + 7) & ~7);
|
|
AFI->setVarArgsStackIndex(MFI->CreateFixedObject(4, StackOffset, true));
|
|
}
|
|
|
|
return Chain;
|
|
}
|
|
|
|
void ARM64TargetLowering::saveVarArgRegisters(CCState &CCInfo,
|
|
SelectionDAG &DAG, SDLoc DL,
|
|
SDValue &Chain) const {
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
MachineFrameInfo *MFI = MF.getFrameInfo();
|
|
ARM64FunctionInfo *FuncInfo = MF.getInfo<ARM64FunctionInfo>();
|
|
|
|
SmallVector<SDValue, 8> MemOps;
|
|
|
|
static const MCPhysReg GPRArgRegs[] = { ARM64::X0, ARM64::X1, ARM64::X2,
|
|
ARM64::X3, ARM64::X4, ARM64::X5,
|
|
ARM64::X6, ARM64::X7 };
|
|
static const unsigned NumGPRArgRegs = array_lengthof(GPRArgRegs);
|
|
unsigned FirstVariadicGPR =
|
|
CCInfo.getFirstUnallocated(GPRArgRegs, NumGPRArgRegs);
|
|
|
|
static const MCPhysReg FPRArgRegs[] = { ARM64::Q0, ARM64::Q1, ARM64::Q2,
|
|
ARM64::Q3, ARM64::Q4, ARM64::Q5,
|
|
ARM64::Q6, ARM64::Q7 };
|
|
static const unsigned NumFPRArgRegs = array_lengthof(FPRArgRegs);
|
|
unsigned FirstVariadicFPR =
|
|
CCInfo.getFirstUnallocated(FPRArgRegs, NumFPRArgRegs);
|
|
|
|
unsigned GPRSaveSize = 8 * (NumGPRArgRegs - FirstVariadicGPR);
|
|
int GPRIdx = 0;
|
|
if (GPRSaveSize != 0) {
|
|
GPRIdx = MFI->CreateStackObject(GPRSaveSize, 8, false);
|
|
|
|
SDValue FIN = DAG.getFrameIndex(GPRIdx, getPointerTy());
|
|
|
|
for (unsigned i = FirstVariadicGPR; i < NumGPRArgRegs; ++i) {
|
|
unsigned VReg = MF.addLiveIn(GPRArgRegs[i], &ARM64::GPR64RegClass);
|
|
SDValue Val = DAG.getCopyFromReg(Chain, DL, VReg, MVT::i64);
|
|
SDValue Store =
|
|
DAG.getStore(Val.getValue(1), DL, Val, FIN,
|
|
MachinePointerInfo::getStack(i * 8), false, false, 0);
|
|
MemOps.push_back(Store);
|
|
FIN = DAG.getNode(ISD::ADD, DL, getPointerTy(), FIN,
|
|
DAG.getConstant(8, getPointerTy()));
|
|
}
|
|
}
|
|
|
|
unsigned FPRSaveSize = 16 * (NumFPRArgRegs - FirstVariadicFPR);
|
|
int FPRIdx = 0;
|
|
if (FPRSaveSize != 0) {
|
|
FPRIdx = MFI->CreateStackObject(FPRSaveSize, 16, false);
|
|
|
|
SDValue FIN = DAG.getFrameIndex(FPRIdx, getPointerTy());
|
|
|
|
for (unsigned i = FirstVariadicFPR; i < NumFPRArgRegs; ++i) {
|
|
unsigned VReg = MF.addLiveIn(FPRArgRegs[i], &ARM64::FPR128RegClass);
|
|
SDValue Val = DAG.getCopyFromReg(Chain, DL, VReg, MVT::v2i64);
|
|
SDValue Store =
|
|
DAG.getStore(Val.getValue(1), DL, Val, FIN,
|
|
MachinePointerInfo::getStack(i * 16), false, false, 0);
|
|
MemOps.push_back(Store);
|
|
FIN = DAG.getNode(ISD::ADD, DL, getPointerTy(), FIN,
|
|
DAG.getConstant(16, getPointerTy()));
|
|
}
|
|
}
|
|
|
|
FuncInfo->setVarArgsGPRIndex(GPRIdx);
|
|
FuncInfo->setVarArgsGPRSize(GPRSaveSize);
|
|
FuncInfo->setVarArgsFPRIndex(FPRIdx);
|
|
FuncInfo->setVarArgsFPRSize(FPRSaveSize);
|
|
|
|
if (!MemOps.empty()) {
|
|
Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, &MemOps[0],
|
|
MemOps.size());
|
|
}
|
|
}
|
|
|
|
/// LowerCallResult - Lower the result values of a call into the
|
|
/// appropriate copies out of appropriate physical registers.
|
|
SDValue ARM64TargetLowering::LowerCallResult(
|
|
SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool isVarArg,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL, SelectionDAG &DAG,
|
|
SmallVectorImpl<SDValue> &InVals, bool isThisReturn,
|
|
SDValue ThisVal) const {
|
|
CCAssignFn *RetCC = CallConv == CallingConv::WebKit_JS ? RetCC_ARM64_WebKit_JS
|
|
: RetCC_ARM64_AAPCS;
|
|
// Assign locations to each value returned by this call.
|
|
SmallVector<CCValAssign, 16> RVLocs;
|
|
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
|
|
getTargetMachine(), RVLocs, *DAG.getContext());
|
|
CCInfo.AnalyzeCallResult(Ins, RetCC);
|
|
|
|
// Copy all of the result registers out of their specified physreg.
|
|
for (unsigned i = 0; i != RVLocs.size(); ++i) {
|
|
CCValAssign VA = RVLocs[i];
|
|
|
|
// Pass 'this' value directly from the argument to return value, to avoid
|
|
// reg unit interference
|
|
if (i == 0 && isThisReturn) {
|
|
assert(!VA.needsCustom() && VA.getLocVT() == MVT::i64 &&
|
|
"unexpected return calling convention register assignment");
|
|
InVals.push_back(ThisVal);
|
|
continue;
|
|
}
|
|
|
|
SDValue Val =
|
|
DAG.getCopyFromReg(Chain, DL, VA.getLocReg(), VA.getLocVT(), InFlag);
|
|
Chain = Val.getValue(1);
|
|
InFlag = Val.getValue(2);
|
|
|
|
switch (VA.getLocInfo()) {
|
|
default:
|
|
llvm_unreachable("Unknown loc info!");
|
|
case CCValAssign::Full:
|
|
break;
|
|
case CCValAssign::BCvt:
|
|
Val = DAG.getNode(ISD::BITCAST, DL, VA.getValVT(), Val);
|
|
break;
|
|
}
|
|
|
|
InVals.push_back(Val);
|
|
}
|
|
|
|
return Chain;
|
|
}
|
|
|
|
bool ARM64TargetLowering::isEligibleForTailCallOptimization(
|
|
SDValue Callee, CallingConv::ID CalleeCC, bool isVarArg,
|
|
bool isCalleeStructRet, bool isCallerStructRet,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<SDValue> &OutVals,
|
|
const SmallVectorImpl<ISD::InputArg> &Ins, SelectionDAG &DAG) const {
|
|
// Look for obvious safe cases to perform tail call optimization that do not
|
|
// require ABI changes. This is what gcc calls sibcall.
|
|
|
|
// Do not sibcall optimize vararg calls unless the call site is not passing
|
|
// any arguments.
|
|
if (isVarArg && !Outs.empty())
|
|
return false;
|
|
|
|
// Also avoid sibcall optimization if either caller or callee uses struct
|
|
// return semantics.
|
|
if (isCalleeStructRet || isCallerStructRet)
|
|
return false;
|
|
|
|
// Note that currently ARM64 "C" calling convention and "Fast" calling
|
|
// convention are compatible. If/when that ever changes, we'll need to
|
|
// add checks here to make sure any interactions are OK.
|
|
|
|
// If the callee takes no arguments then go on to check the results of the
|
|
// call.
|
|
if (!Outs.empty()) {
|
|
// Check if stack adjustment is needed. For now, do not do this if any
|
|
// argument is passed on the stack.
|
|
SmallVector<CCValAssign, 16> ArgLocs;
|
|
CCState CCInfo(CalleeCC, isVarArg, DAG.getMachineFunction(),
|
|
getTargetMachine(), ArgLocs, *DAG.getContext());
|
|
CCAssignFn *AssignFn = CCAssignFnForCall(CalleeCC, /*IsVarArg=*/false);
|
|
CCInfo.AnalyzeCallOperands(Outs, AssignFn);
|
|
if (CCInfo.getNextStackOffset()) {
|
|
// Check if the arguments are already laid out in the right way as
|
|
// the caller's fixed stack objects.
|
|
for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size(); i != e;
|
|
++i, ++realArgIdx) {
|
|
CCValAssign &VA = ArgLocs[i];
|
|
if (VA.getLocInfo() == CCValAssign::Indirect)
|
|
return false;
|
|
if (VA.needsCustom()) {
|
|
// Just don't handle anything that needs custom adjustments for now.
|
|
// If need be, we can revisit later, but we shouldn't ever end up
|
|
// here.
|
|
return false;
|
|
} else if (!VA.isRegLoc()) {
|
|
// Likewise, don't try to handle stack based arguments for the
|
|
// time being.
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
/// LowerCall - Lower a call to a callseq_start + CALL + callseq_end chain,
|
|
/// and add input and output parameter nodes.
|
|
SDValue ARM64TargetLowering::LowerCall(CallLoweringInfo &CLI,
|
|
SmallVectorImpl<SDValue> &InVals) const {
|
|
SelectionDAG &DAG = CLI.DAG;
|
|
SDLoc &DL = CLI.DL;
|
|
SmallVector<ISD::OutputArg, 32> &Outs = CLI.Outs;
|
|
SmallVector<SDValue, 32> &OutVals = CLI.OutVals;
|
|
SmallVector<ISD::InputArg, 32> &Ins = CLI.Ins;
|
|
SDValue Chain = CLI.Chain;
|
|
SDValue Callee = CLI.Callee;
|
|
bool &IsTailCall = CLI.IsTailCall;
|
|
CallingConv::ID CallConv = CLI.CallConv;
|
|
bool IsVarArg = CLI.IsVarArg;
|
|
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
bool IsStructRet = (Outs.empty()) ? false : Outs[0].Flags.isSRet();
|
|
bool IsThisReturn = false;
|
|
|
|
// If tail calls are explicitly disabled, make sure not to use them.
|
|
if (!EnableARM64TailCalls)
|
|
IsTailCall = false;
|
|
|
|
if (IsTailCall) {
|
|
// Check if it's really possible to do a tail call.
|
|
IsTailCall = isEligibleForTailCallOptimization(
|
|
Callee, CallConv, IsVarArg, IsStructRet,
|
|
MF.getFunction()->hasStructRetAttr(), Outs, OutVals, Ins, DAG);
|
|
// We don't support GuaranteedTailCallOpt, only automatically
|
|
// detected sibcalls.
|
|
// FIXME: Re-evaluate. Is this true? Should it be true?
|
|
if (IsTailCall)
|
|
++NumTailCalls;
|
|
}
|
|
|
|
// Analyze operands of the call, assigning locations to each operand.
|
|
SmallVector<CCValAssign, 16> ArgLocs;
|
|
CCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(),
|
|
getTargetMachine(), ArgLocs, *DAG.getContext());
|
|
|
|
if (IsVarArg) {
|
|
// Handle fixed and variable vector arguments differently.
|
|
// Variable vector arguments always go into memory.
|
|
unsigned NumArgs = Outs.size();
|
|
|
|
for (unsigned i = 0; i != NumArgs; ++i) {
|
|
MVT ArgVT = Outs[i].VT;
|
|
ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
|
|
CCAssignFn *AssignFn = CCAssignFnForCall(CallConv,
|
|
/*IsVarArg=*/ !Outs[i].IsFixed);
|
|
bool Res = AssignFn(i, ArgVT, ArgVT, CCValAssign::Full, ArgFlags, CCInfo);
|
|
assert(!Res && "Call operand has unhandled type");
|
|
(void)Res;
|
|
}
|
|
} else {
|
|
// At this point, Outs[].VT may already be promoted to i32. To correctly
|
|
// handle passing i8 as i8 instead of i32 on stack, we pass in both i32 and
|
|
// i8 to CC_ARM64_AAPCS with i32 being ValVT and i8 being LocVT.
|
|
// Since AnalyzeCallOperands uses Ins[].VT for both ValVT and LocVT, here
|
|
// we use a special version of AnalyzeCallOperands to pass in ValVT and
|
|
// LocVT.
|
|
unsigned NumArgs = Outs.size();
|
|
for (unsigned i = 0; i != NumArgs; ++i) {
|
|
MVT ValVT = Outs[i].VT;
|
|
// Get type of the original argument.
|
|
EVT ActualVT = getValueType(CLI.Args[Outs[i].OrigArgIndex].Ty,
|
|
/*AllowUnknown*/ true);
|
|
MVT ActualMVT = ActualVT.isSimple() ? ActualVT.getSimpleVT() : ValVT;
|
|
ISD::ArgFlagsTy ArgFlags = Outs[i].Flags;
|
|
// If ActualMVT is i1/i8/i16, we should set LocVT to i8/i8/i16.
|
|
MVT LocVT = ValVT;
|
|
if (ActualMVT == MVT::i1 || ActualMVT == MVT::i8)
|
|
LocVT = MVT::i8;
|
|
else if (ActualMVT == MVT::i16)
|
|
LocVT = MVT::i16;
|
|
|
|
CCAssignFn *AssignFn = CCAssignFnForCall(CallConv, /*IsVarArg=*/false);
|
|
bool Res = AssignFn(i, ValVT, LocVT, CCValAssign::Full, ArgFlags, CCInfo);
|
|
assert(!Res && "Call operand has unhandled type");
|
|
(void)Res;
|
|
}
|
|
}
|
|
|
|
// Get a count of how many bytes are to be pushed on the stack.
|
|
unsigned NumBytes = CCInfo.getNextStackOffset();
|
|
|
|
// Adjust the stack pointer for the new arguments...
|
|
// These operations are automatically eliminated by the prolog/epilog pass
|
|
if (!IsTailCall)
|
|
Chain =
|
|
DAG.getCALLSEQ_START(Chain, DAG.getIntPtrConstant(NumBytes, true), DL);
|
|
|
|
SDValue StackPtr = DAG.getCopyFromReg(Chain, DL, ARM64::SP, getPointerTy());
|
|
|
|
SmallVector<std::pair<unsigned, SDValue>, 8> RegsToPass;
|
|
SmallVector<SDValue, 8> MemOpChains;
|
|
|
|
// Walk the register/memloc assignments, inserting copies/loads.
|
|
for (unsigned i = 0, realArgIdx = 0, e = ArgLocs.size(); i != e;
|
|
++i, ++realArgIdx) {
|
|
CCValAssign &VA = ArgLocs[i];
|
|
SDValue Arg = OutVals[realArgIdx];
|
|
ISD::ArgFlagsTy Flags = Outs[realArgIdx].Flags;
|
|
|
|
// Promote the value if needed.
|
|
switch (VA.getLocInfo()) {
|
|
default:
|
|
llvm_unreachable("Unknown loc info!");
|
|
case CCValAssign::Full:
|
|
break;
|
|
case CCValAssign::SExt:
|
|
Arg = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), Arg);
|
|
break;
|
|
case CCValAssign::ZExt:
|
|
Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), Arg);
|
|
break;
|
|
case CCValAssign::AExt:
|
|
Arg = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), Arg);
|
|
break;
|
|
case CCValAssign::BCvt:
|
|
Arg = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Arg);
|
|
break;
|
|
case CCValAssign::FPExt:
|
|
Arg = DAG.getNode(ISD::FP_EXTEND, DL, VA.getLocVT(), Arg);
|
|
break;
|
|
}
|
|
|
|
if (VA.isRegLoc()) {
|
|
if (realArgIdx == 0 && Flags.isReturned() && Outs[0].VT == MVT::i64) {
|
|
assert(VA.getLocVT() == MVT::i64 &&
|
|
"unexpected calling convention register assignment");
|
|
assert(!Ins.empty() && Ins[0].VT == MVT::i64 &&
|
|
"unexpected use of 'returned'");
|
|
IsThisReturn = true;
|
|
}
|
|
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
|
|
} else {
|
|
assert(VA.isMemLoc());
|
|
// There's no reason we can't support stack args w/ tailcall, but
|
|
// we currently don't, so assert if we see one.
|
|
assert(!IsTailCall && "stack argument with tail call!?");
|
|
unsigned LocMemOffset = VA.getLocMemOffset();
|
|
SDValue PtrOff = DAG.getIntPtrConstant(LocMemOffset);
|
|
PtrOff = DAG.getNode(ISD::ADD, DL, getPointerTy(), StackPtr, PtrOff);
|
|
|
|
if (Outs[i].Flags.isByVal()) {
|
|
SDValue SizeNode =
|
|
DAG.getConstant(Outs[i].Flags.getByValSize(), MVT::i64);
|
|
SDValue Cpy = DAG.getMemcpy(
|
|
Chain, DL, PtrOff, Arg, SizeNode, Outs[i].Flags.getByValAlign(),
|
|
/*isVolatile = */ false,
|
|
/*alwaysInline = */ false,
|
|
MachinePointerInfo::getStack(LocMemOffset), MachinePointerInfo());
|
|
|
|
MemOpChains.push_back(Cpy);
|
|
} else {
|
|
// Since we pass i1/i8/i16 as i1/i8/i16 on stack and Arg is already
|
|
// promoted to a legal register type i32, we should truncate Arg back to
|
|
// i1/i8/i16.
|
|
if (Arg.getValueType().isSimple() &&
|
|
Arg.getValueType().getSimpleVT() == MVT::i32 &&
|
|
(VA.getLocVT() == MVT::i1 || VA.getLocVT() == MVT::i8 ||
|
|
VA.getLocVT() == MVT::i16))
|
|
Arg = DAG.getNode(ISD::TRUNCATE, DL, VA.getLocVT(), Arg);
|
|
|
|
SDValue Store = DAG.getStore(Chain, DL, Arg, PtrOff,
|
|
MachinePointerInfo::getStack(LocMemOffset),
|
|
false, false, 0);
|
|
MemOpChains.push_back(Store);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!MemOpChains.empty())
|
|
Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, &MemOpChains[0],
|
|
MemOpChains.size());
|
|
|
|
// Build a sequence of copy-to-reg nodes chained together with token chain
|
|
// and flag operands which copy the outgoing args into the appropriate regs.
|
|
SDValue InFlag;
|
|
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
|
|
Chain = DAG.getCopyToReg(Chain, DL, RegsToPass[i].first,
|
|
RegsToPass[i].second, InFlag);
|
|
InFlag = Chain.getValue(1);
|
|
}
|
|
|
|
// If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
|
|
// direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
|
|
// node so that legalize doesn't hack it.
|
|
if (getTargetMachine().getCodeModel() == CodeModel::Large &&
|
|
Subtarget->isTargetMachO()) {
|
|
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
|
|
const GlobalValue *GV = G->getGlobal();
|
|
bool InternalLinkage = GV->hasInternalLinkage();
|
|
if (InternalLinkage)
|
|
Callee = DAG.getTargetGlobalAddress(GV, DL, getPointerTy(), 0, 0);
|
|
else {
|
|
Callee = DAG.getTargetGlobalAddress(GV, DL, getPointerTy(), 0,
|
|
ARM64II::MO_GOT);
|
|
Callee = DAG.getNode(ARM64ISD::LOADgot, DL, getPointerTy(), Callee);
|
|
}
|
|
} else if (ExternalSymbolSDNode *S =
|
|
dyn_cast<ExternalSymbolSDNode>(Callee)) {
|
|
const char *Sym = S->getSymbol();
|
|
Callee =
|
|
DAG.getTargetExternalSymbol(Sym, getPointerTy(), ARM64II::MO_GOT);
|
|
Callee = DAG.getNode(ARM64ISD::LOADgot, DL, getPointerTy(), Callee);
|
|
}
|
|
} else if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
|
|
const GlobalValue *GV = G->getGlobal();
|
|
Callee = DAG.getTargetGlobalAddress(GV, DL, getPointerTy(), 0, 0);
|
|
} else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
|
|
const char *Sym = S->getSymbol();
|
|
Callee = DAG.getTargetExternalSymbol(Sym, getPointerTy(), 0);
|
|
}
|
|
|
|
std::vector<SDValue> Ops;
|
|
Ops.push_back(Chain);
|
|
Ops.push_back(Callee);
|
|
|
|
// Add argument registers to the end of the list so that they are known live
|
|
// into the call.
|
|
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
|
|
Ops.push_back(DAG.getRegister(RegsToPass[i].first,
|
|
RegsToPass[i].second.getValueType()));
|
|
|
|
// Add a register mask operand representing the call-preserved registers.
|
|
const uint32_t *Mask;
|
|
const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
|
|
const ARM64RegisterInfo *ARI = static_cast<const ARM64RegisterInfo *>(TRI);
|
|
if (IsThisReturn) {
|
|
// For 'this' returns, use the X0-preserving mask if applicable
|
|
Mask = ARI->getThisReturnPreservedMask(CallConv);
|
|
if (!Mask) {
|
|
IsThisReturn = false;
|
|
Mask = ARI->getCallPreservedMask(CallConv);
|
|
}
|
|
} else
|
|
Mask = ARI->getCallPreservedMask(CallConv);
|
|
|
|
assert(Mask && "Missing call preserved mask for calling convention");
|
|
Ops.push_back(DAG.getRegisterMask(Mask));
|
|
|
|
if (InFlag.getNode())
|
|
Ops.push_back(InFlag);
|
|
|
|
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
|
|
|
|
// If we're doing a tall call, use a TC_RETURN here rather than an
|
|
// actual call instruction.
|
|
if (IsTailCall)
|
|
return DAG.getNode(ARM64ISD::TC_RETURN, DL, NodeTys, &Ops[0], Ops.size());
|
|
|
|
// Returns a chain and a flag for retval copy to use.
|
|
Chain = DAG.getNode(ARM64ISD::CALL, DL, NodeTys, &Ops[0], Ops.size());
|
|
InFlag = Chain.getValue(1);
|
|
|
|
Chain = DAG.getCALLSEQ_END(Chain, DAG.getIntPtrConstant(NumBytes, true),
|
|
DAG.getIntPtrConstant(0, true), InFlag, DL);
|
|
if (!Ins.empty())
|
|
InFlag = Chain.getValue(1);
|
|
|
|
// Handle result values, copying them out of physregs into vregs that we
|
|
// return.
|
|
return LowerCallResult(Chain, InFlag, CallConv, IsVarArg, Ins, DL, DAG,
|
|
InVals, IsThisReturn,
|
|
IsThisReturn ? OutVals[0] : SDValue());
|
|
}
|
|
|
|
bool ARM64TargetLowering::CanLowerReturn(
|
|
CallingConv::ID CallConv, MachineFunction &MF, bool isVarArg,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs, LLVMContext &Context) const {
|
|
CCAssignFn *RetCC = CallConv == CallingConv::WebKit_JS ? RetCC_ARM64_WebKit_JS
|
|
: RetCC_ARM64_AAPCS;
|
|
SmallVector<CCValAssign, 16> RVLocs;
|
|
CCState CCInfo(CallConv, isVarArg, MF, getTargetMachine(), RVLocs, Context);
|
|
return CCInfo.CheckReturn(Outs, RetCC);
|
|
}
|
|
|
|
SDValue
|
|
ARM64TargetLowering::LowerReturn(SDValue Chain, CallingConv::ID CallConv,
|
|
bool isVarArg,
|
|
const SmallVectorImpl<ISD::OutputArg> &Outs,
|
|
const SmallVectorImpl<SDValue> &OutVals,
|
|
SDLoc DL, SelectionDAG &DAG) const {
|
|
CCAssignFn *RetCC = CallConv == CallingConv::WebKit_JS ? RetCC_ARM64_WebKit_JS
|
|
: RetCC_ARM64_AAPCS;
|
|
SmallVector<CCValAssign, 16> RVLocs;
|
|
CCState CCInfo(CallConv, isVarArg, DAG.getMachineFunction(),
|
|
getTargetMachine(), RVLocs, *DAG.getContext());
|
|
CCInfo.AnalyzeReturn(Outs, RetCC);
|
|
|
|
// Copy the result values into the output registers.
|
|
SDValue Flag;
|
|
SmallVector<SDValue, 4> RetOps(1, Chain);
|
|
for (unsigned i = 0, realRVLocIdx = 0; i != RVLocs.size();
|
|
++i, ++realRVLocIdx) {
|
|
CCValAssign &VA = RVLocs[i];
|
|
assert(VA.isRegLoc() && "Can only return in registers!");
|
|
SDValue Arg = OutVals[realRVLocIdx];
|
|
|
|
switch (VA.getLocInfo()) {
|
|
default:
|
|
llvm_unreachable("Unknown loc info!");
|
|
case CCValAssign::Full:
|
|
break;
|
|
case CCValAssign::BCvt:
|
|
Arg = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Arg);
|
|
break;
|
|
}
|
|
|
|
Chain = DAG.getCopyToReg(Chain, DL, VA.getLocReg(), Arg, Flag);
|
|
Flag = Chain.getValue(1);
|
|
RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
|
|
}
|
|
|
|
RetOps[0] = Chain; // Update chain.
|
|
|
|
// Add the flag if we have it.
|
|
if (Flag.getNode())
|
|
RetOps.push_back(Flag);
|
|
|
|
return DAG.getNode(ARM64ISD::RET_FLAG, DL, MVT::Other, &RetOps[0],
|
|
RetOps.size());
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Other Lowering Code
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
SDValue ARM64TargetLowering::LowerGlobalAddress(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
EVT PtrVT = getPointerTy();
|
|
SDLoc DL(Op);
|
|
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
|
|
unsigned char OpFlags =
|
|
Subtarget->ClassifyGlobalReference(GV, getTargetMachine());
|
|
|
|
assert(cast<GlobalAddressSDNode>(Op)->getOffset() == 0 &&
|
|
"unexpected offset in global node");
|
|
|
|
// This also catched the large code model case for Darwin.
|
|
if ((OpFlags & ARM64II::MO_GOT) != 0) {
|
|
SDValue GotAddr = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, OpFlags);
|
|
// FIXME: Once remat is capable of dealing with instructions with register
|
|
// operands, expand this into two nodes instead of using a wrapper node.
|
|
return DAG.getNode(ARM64ISD::LOADgot, DL, PtrVT, GotAddr);
|
|
}
|
|
|
|
if (getTargetMachine().getCodeModel() == CodeModel::Large) {
|
|
const unsigned char MO_NC = ARM64II::MO_NC;
|
|
return DAG.getNode(
|
|
ARM64ISD::WrapperLarge, DL, PtrVT,
|
|
DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, ARM64II::MO_G3),
|
|
DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, ARM64II::MO_G2 | MO_NC),
|
|
DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, ARM64II::MO_G1 | MO_NC),
|
|
DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, ARM64II::MO_G0 | MO_NC));
|
|
} else {
|
|
// Use ADRP/ADD or ADRP/LDR for everything else: the small model on ELF and
|
|
// the only correct model on Darwin.
|
|
SDValue Hi = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0,
|
|
OpFlags | ARM64II::MO_PAGE);
|
|
unsigned char LoFlags = OpFlags | ARM64II::MO_PAGEOFF | ARM64II::MO_NC;
|
|
SDValue Lo = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, LoFlags);
|
|
|
|
SDValue ADRP = DAG.getNode(ARM64ISD::ADRP, DL, PtrVT, Hi);
|
|
return DAG.getNode(ARM64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
|
|
}
|
|
}
|
|
|
|
/// \brief Convert a TLS address reference into the correct sequence of loads
|
|
/// and calls to compute the variable's address (for Darwin, currently) and
|
|
/// return an SDValue containing the final node.
|
|
|
|
/// Darwin only has one TLS scheme which must be capable of dealing with the
|
|
/// fully general situation, in the worst case. This means:
|
|
/// + "extern __thread" declaration.
|
|
/// + Defined in a possibly unknown dynamic library.
|
|
///
|
|
/// The general system is that each __thread variable has a [3 x i64] descriptor
|
|
/// which contains information used by the runtime to calculate the address. The
|
|
/// only part of this the compiler needs to know about is the first xword, which
|
|
/// contains a function pointer that must be called with the address of the
|
|
/// entire descriptor in "x0".
|
|
///
|
|
/// Since this descriptor may be in a different unit, in general even the
|
|
/// descriptor must be accessed via an indirect load. The "ideal" code sequence
|
|
/// is:
|
|
/// adrp x0, _var@TLVPPAGE
|
|
/// ldr x0, [x0, _var@TLVPPAGEOFF] ; x0 now contains address of descriptor
|
|
/// ldr x1, [x0] ; x1 contains 1st entry of descriptor,
|
|
/// ; the function pointer
|
|
/// blr x1 ; Uses descriptor address in x0
|
|
/// ; Address of _var is now in x0.
|
|
///
|
|
/// If the address of _var's descriptor *is* known to the linker, then it can
|
|
/// change the first "ldr" instruction to an appropriate "add x0, x0, #imm" for
|
|
/// a slight efficiency gain.
|
|
SDValue
|
|
ARM64TargetLowering::LowerDarwinGlobalTLSAddress(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
assert(Subtarget->isTargetDarwin() && "TLS only supported on Darwin");
|
|
|
|
SDLoc DL(Op);
|
|
MVT PtrVT = getPointerTy();
|
|
const GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
|
|
|
|
SDValue TLVPAddr =
|
|
DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, ARM64II::MO_TLS);
|
|
SDValue DescAddr = DAG.getNode(ARM64ISD::LOADgot, DL, PtrVT, TLVPAddr);
|
|
|
|
// The first entry in the descriptor is a function pointer that we must call
|
|
// to obtain the address of the variable.
|
|
SDValue Chain = DAG.getEntryNode();
|
|
SDValue FuncTLVGet =
|
|
DAG.getLoad(MVT::i64, DL, Chain, DescAddr, MachinePointerInfo::getGOT(),
|
|
false, true, true, 8);
|
|
Chain = FuncTLVGet.getValue(1);
|
|
|
|
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
|
|
MFI->setAdjustsStack(true);
|
|
|
|
// TLS calls preserve all registers except those that absolutely must be
|
|
// trashed: X0 (it takes an argument), LR (it's a call) and CPSR (let's not be
|
|
// silly).
|
|
const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
|
|
const ARM64RegisterInfo *ARI = static_cast<const ARM64RegisterInfo *>(TRI);
|
|
const uint32_t *Mask = ARI->getTLSCallPreservedMask();
|
|
|
|
// Finally, we can make the call. This is just a degenerate version of a
|
|
// normal ARM64 call node: x0 takes the address of the descriptor, and returns
|
|
// the address of the variable in this thread.
|
|
Chain = DAG.getCopyToReg(Chain, DL, ARM64::X0, DescAddr, SDValue());
|
|
Chain = DAG.getNode(ARM64ISD::CALL, DL, DAG.getVTList(MVT::Other, MVT::Glue),
|
|
Chain, FuncTLVGet, DAG.getRegister(ARM64::X0, MVT::i64),
|
|
DAG.getRegisterMask(Mask), Chain.getValue(1));
|
|
return DAG.getCopyFromReg(Chain, DL, ARM64::X0, PtrVT, Chain.getValue(1));
|
|
}
|
|
|
|
/// When accessing thread-local variables under either the general-dynamic or
|
|
/// local-dynamic system, we make a "TLS-descriptor" call. The variable will
|
|
/// have a descriptor, accessible via a PC-relative ADRP, and whose first entry
|
|
/// is a function pointer to carry out the resolution. This function takes the
|
|
/// address of the descriptor in X0 and returns the TPIDR_EL0 offset in X0. All
|
|
/// other registers (except LR, CPSR) are preserved.
|
|
///
|
|
/// Thus, the ideal call sequence on AArch64 is:
|
|
///
|
|
/// adrp x0, :tlsdesc:thread_var
|
|
/// ldr x8, [x0, :tlsdesc_lo12:thread_var]
|
|
/// add x0, x0, :tlsdesc_lo12:thread_var
|
|
/// .tlsdesccall thread_var
|
|
/// blr x8
|
|
/// (TPIDR_EL0 offset now in x0).
|
|
///
|
|
/// The ".tlsdesccall" directive instructs the assembler to insert a particular
|
|
/// relocation to help the linker relax this sequence if it turns out to be too
|
|
/// conservative.
|
|
///
|
|
/// FIXME: we currently produce an extra, duplicated, ADRP instruction, but this
|
|
/// is harmless.
|
|
SDValue ARM64TargetLowering::LowerELFTLSDescCall(SDValue SymAddr,
|
|
SDValue DescAddr, SDLoc DL,
|
|
SelectionDAG &DAG) const {
|
|
EVT PtrVT = getPointerTy();
|
|
|
|
// The function we need to call is simply the first entry in the GOT for this
|
|
// descriptor, load it in preparation.
|
|
SDValue Func = DAG.getNode(ARM64ISD::LOADgot, DL, PtrVT, SymAddr);
|
|
|
|
// TLS calls preserve all registers except those that absolutely must be
|
|
// trashed: X0 (it takes an argument), LR (it's a call) and CPSR (let's not be
|
|
// silly).
|
|
const TargetRegisterInfo *TRI = getTargetMachine().getRegisterInfo();
|
|
const ARM64RegisterInfo *ARI = static_cast<const ARM64RegisterInfo *>(TRI);
|
|
const uint32_t *Mask = ARI->getTLSCallPreservedMask();
|
|
|
|
// The function takes only one argument: the address of the descriptor itself
|
|
// in X0.
|
|
SDValue Glue, Chain;
|
|
Chain = DAG.getCopyToReg(DAG.getEntryNode(), DL, ARM64::X0, DescAddr, Glue);
|
|
Glue = Chain.getValue(1);
|
|
|
|
// We're now ready to populate the argument list, as with a normal call:
|
|
SmallVector<SDValue, 6> Ops;
|
|
Ops.push_back(Chain);
|
|
Ops.push_back(Func);
|
|
Ops.push_back(SymAddr);
|
|
Ops.push_back(DAG.getRegister(ARM64::X0, PtrVT));
|
|
Ops.push_back(DAG.getRegisterMask(Mask));
|
|
Ops.push_back(Glue);
|
|
|
|
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
|
|
Chain = DAG.getNode(ARM64ISD::TLSDESC_CALL, DL, NodeTys, &Ops[0], Ops.size());
|
|
Glue = Chain.getValue(1);
|
|
|
|
return DAG.getCopyFromReg(Chain, DL, ARM64::X0, PtrVT, Glue);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerELFGlobalTLSAddress(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
assert(Subtarget->isTargetELF() && "This function expects an ELF target");
|
|
assert(getTargetMachine().getCodeModel() == CodeModel::Small &&
|
|
"ELF TLS only supported in small memory model");
|
|
const GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
|
|
|
|
TLSModel::Model Model = getTargetMachine().getTLSModel(GA->getGlobal());
|
|
|
|
SDValue TPOff;
|
|
EVT PtrVT = getPointerTy();
|
|
SDLoc DL(Op);
|
|
const GlobalValue *GV = GA->getGlobal();
|
|
|
|
SDValue ThreadBase = DAG.getNode(ARM64ISD::THREAD_POINTER, DL, PtrVT);
|
|
|
|
if (Model == TLSModel::LocalExec) {
|
|
SDValue HiVar = DAG.getTargetGlobalAddress(
|
|
GV, DL, PtrVT, 0, ARM64II::MO_TLS | ARM64II::MO_G1);
|
|
SDValue LoVar = DAG.getTargetGlobalAddress(
|
|
GV, DL, PtrVT, 0, ARM64II::MO_TLS | ARM64II::MO_G0 | ARM64II::MO_NC);
|
|
|
|
TPOff = SDValue(DAG.getMachineNode(ARM64::MOVZXi, DL, PtrVT, HiVar,
|
|
DAG.getTargetConstant(16, MVT::i32)),
|
|
0);
|
|
TPOff = SDValue(DAG.getMachineNode(ARM64::MOVKXi, DL, PtrVT, TPOff, LoVar,
|
|
DAG.getTargetConstant(0, MVT::i32)),
|
|
0);
|
|
} else if (Model == TLSModel::InitialExec) {
|
|
TPOff = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, ARM64II::MO_TLS);
|
|
TPOff = DAG.getNode(ARM64ISD::LOADgot, DL, PtrVT, TPOff);
|
|
} else if (Model == TLSModel::LocalDynamic) {
|
|
// Local-dynamic accesses proceed in two phases. A general-dynamic TLS
|
|
// descriptor call against the special symbol _TLS_MODULE_BASE_ to calculate
|
|
// the beginning of the module's TLS region, followed by a DTPREL offset
|
|
// calculation.
|
|
|
|
// These accesses will need deduplicating if there's more than one.
|
|
ARM64FunctionInfo *MFI =
|
|
DAG.getMachineFunction().getInfo<ARM64FunctionInfo>();
|
|
MFI->incNumLocalDynamicTLSAccesses();
|
|
|
|
// Accesses used in this sequence go via the TLS descriptor which lives in
|
|
// the GOT. Prepare an address we can use to handle this.
|
|
SDValue HiDesc = DAG.getTargetExternalSymbol(
|
|
"_TLS_MODULE_BASE_", PtrVT, ARM64II::MO_TLS | ARM64II::MO_PAGE);
|
|
SDValue LoDesc = DAG.getTargetExternalSymbol(
|
|
"_TLS_MODULE_BASE_", PtrVT,
|
|
ARM64II::MO_TLS | ARM64II::MO_PAGEOFF | ARM64II::MO_NC);
|
|
|
|
// First argument to the descriptor call is the address of the descriptor
|
|
// itself.
|
|
SDValue DescAddr = DAG.getNode(ARM64ISD::ADRP, DL, PtrVT, HiDesc);
|
|
DescAddr = DAG.getNode(ARM64ISD::ADDlow, DL, PtrVT, DescAddr, LoDesc);
|
|
|
|
// The call needs a relocation too for linker relaxation. It doesn't make
|
|
// sense to call it MO_PAGE or MO_PAGEOFF though so we need another copy of
|
|
// the address.
|
|
SDValue SymAddr = DAG.getTargetExternalSymbol("_TLS_MODULE_BASE_", PtrVT,
|
|
ARM64II::MO_TLS);
|
|
|
|
// Now we can calculate the offset from TPIDR_EL0 to this module's
|
|
// thread-local area.
|
|
TPOff = LowerELFTLSDescCall(SymAddr, DescAddr, DL, DAG);
|
|
|
|
// Now use :dtprel_whatever: operations to calculate this variable's offset
|
|
// in its thread-storage area.
|
|
SDValue HiVar = DAG.getTargetGlobalAddress(
|
|
GV, DL, MVT::i64, 0, ARM64II::MO_TLS | ARM64II::MO_G1);
|
|
SDValue LoVar = DAG.getTargetGlobalAddress(
|
|
GV, DL, MVT::i64, 0, ARM64II::MO_TLS | ARM64II::MO_G0 | ARM64II::MO_NC);
|
|
|
|
SDValue DTPOff =
|
|
SDValue(DAG.getMachineNode(ARM64::MOVZXi, DL, PtrVT, HiVar,
|
|
DAG.getTargetConstant(16, MVT::i32)),
|
|
0);
|
|
DTPOff = SDValue(DAG.getMachineNode(ARM64::MOVKXi, DL, PtrVT, DTPOff, LoVar,
|
|
DAG.getTargetConstant(0, MVT::i32)),
|
|
0);
|
|
|
|
TPOff = DAG.getNode(ISD::ADD, DL, PtrVT, TPOff, DTPOff);
|
|
} else if (Model == TLSModel::GeneralDynamic) {
|
|
// Accesses used in this sequence go via the TLS descriptor which lives in
|
|
// the GOT. Prepare an address we can use to handle this.
|
|
SDValue HiDesc = DAG.getTargetGlobalAddress(
|
|
GV, DL, PtrVT, 0, ARM64II::MO_TLS | ARM64II::MO_PAGE);
|
|
SDValue LoDesc = DAG.getTargetGlobalAddress(
|
|
GV, DL, PtrVT, 0,
|
|
ARM64II::MO_TLS | ARM64II::MO_PAGEOFF | ARM64II::MO_NC);
|
|
|
|
// First argument to the descriptor call is the address of the descriptor
|
|
// itself.
|
|
SDValue DescAddr = DAG.getNode(ARM64ISD::ADRP, DL, PtrVT, HiDesc);
|
|
DescAddr = DAG.getNode(ARM64ISD::ADDlow, DL, PtrVT, DescAddr, LoDesc);
|
|
|
|
// The call needs a relocation too for linker relaxation. It doesn't make
|
|
// sense to call it MO_PAGE or MO_PAGEOFF though so we need another copy of
|
|
// the address.
|
|
SDValue SymAddr =
|
|
DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, ARM64II::MO_TLS);
|
|
|
|
// Finally we can make a call to calculate the offset from tpidr_el0.
|
|
TPOff = LowerELFTLSDescCall(SymAddr, DescAddr, DL, DAG);
|
|
} else
|
|
llvm_unreachable("Unsupported ELF TLS access model");
|
|
|
|
return DAG.getNode(ISD::ADD, DL, PtrVT, ThreadBase, TPOff);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerGlobalTLSAddress(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
if (Subtarget->isTargetDarwin())
|
|
return LowerDarwinGlobalTLSAddress(Op, DAG);
|
|
else if (Subtarget->isTargetELF())
|
|
return LowerELFGlobalTLSAddress(Op, DAG);
|
|
|
|
llvm_unreachable("Unexpected platform trying to use TLS");
|
|
}
|
|
SDValue ARM64TargetLowering::LowerBR_CC(SDValue Op, SelectionDAG &DAG) const {
|
|
SDValue Chain = Op.getOperand(0);
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(1))->get();
|
|
SDValue LHS = Op.getOperand(2);
|
|
SDValue RHS = Op.getOperand(3);
|
|
SDValue Dest = Op.getOperand(4);
|
|
SDLoc dl(Op);
|
|
|
|
// Handle f128 first, since lowering it will result in comparing the return
|
|
// value of a libcall against zero, which is just what the rest of LowerBR_CC
|
|
// is expecting to deal with.
|
|
if (LHS.getValueType() == MVT::f128) {
|
|
softenSetCCOperands(DAG, MVT::f128, LHS, RHS, CC, dl);
|
|
|
|
// If softenSetCCOperands returned a scalar, we need to compare the result
|
|
// against zero to select between true and false values.
|
|
if (RHS.getNode() == 0) {
|
|
RHS = DAG.getConstant(0, LHS.getValueType());
|
|
CC = ISD::SETNE;
|
|
}
|
|
}
|
|
|
|
// Optimize {s|u}{add|sub|mul}.with.overflow feeding into a branch
|
|
// instruction.
|
|
unsigned Opc = LHS.getOpcode();
|
|
if (LHS.getResNo() == 1 && isa<ConstantSDNode>(RHS) &&
|
|
cast<ConstantSDNode>(RHS)->isOne() &&
|
|
(Opc == ISD::SADDO || Opc == ISD::UADDO || Opc == ISD::SSUBO ||
|
|
Opc == ISD::USUBO || Opc == ISD::SMULO || Opc == ISD::UMULO)) {
|
|
assert((CC == ISD::SETEQ || CC == ISD::SETNE) &&
|
|
"Unexpected condition code.");
|
|
// Only lower legal XALUO ops.
|
|
if (!DAG.getTargetLoweringInfo().isTypeLegal(LHS->getValueType(0)))
|
|
return SDValue();
|
|
|
|
// The actual operation with overflow check.
|
|
ARM64CC::CondCode OFCC;
|
|
SDValue Value, Overflow;
|
|
std::tie(Value, Overflow) = getARM64XALUOOp(OFCC, LHS.getValue(0), DAG);
|
|
|
|
if (CC == ISD::SETNE)
|
|
OFCC = getInvertedCondCode(OFCC);
|
|
SDValue CCVal = DAG.getConstant(OFCC, MVT::i32);
|
|
|
|
return DAG.getNode(ARM64ISD::BRCOND, SDLoc(LHS), MVT::Other, Chain, Dest,
|
|
CCVal, Overflow);
|
|
}
|
|
|
|
if (LHS.getValueType().isInteger()) {
|
|
assert((LHS.getValueType() == RHS.getValueType()) &&
|
|
(LHS.getValueType() == MVT::i32 || LHS.getValueType() == MVT::i64));
|
|
|
|
// If the RHS of the comparison is zero, we can potentially fold this
|
|
// to a specialized branch.
|
|
const ConstantSDNode *RHSC = dyn_cast<ConstantSDNode>(RHS);
|
|
if (RHSC && RHSC->getZExtValue() == 0) {
|
|
if (CC == ISD::SETEQ) {
|
|
// See if we can use a TBZ to fold in an AND as well.
|
|
// TBZ has a smaller branch displacement than CBZ. If the offset is
|
|
// out of bounds, a late MI-layer pass rewrites branches.
|
|
// 403.gcc is an example that hits this case.
|
|
if (LHS.getOpcode() == ISD::AND &&
|
|
isa<ConstantSDNode>(LHS.getOperand(1)) &&
|
|
isPowerOf2_64(LHS.getConstantOperandVal(1))) {
|
|
SDValue Test = LHS.getOperand(0);
|
|
uint64_t Mask = LHS.getConstantOperandVal(1);
|
|
|
|
// TBZ only operates on i64's, but the ext should be free.
|
|
if (Test.getValueType() == MVT::i32)
|
|
Test = DAG.getAnyExtOrTrunc(Test, dl, MVT::i64);
|
|
|
|
return DAG.getNode(ARM64ISD::TBZ, dl, MVT::Other, Chain, Test,
|
|
DAG.getConstant(Log2_64(Mask), MVT::i64), Dest);
|
|
}
|
|
|
|
return DAG.getNode(ARM64ISD::CBZ, dl, MVT::Other, Chain, LHS, Dest);
|
|
} else if (CC == ISD::SETNE) {
|
|
// See if we can use a TBZ to fold in an AND as well.
|
|
// TBZ has a smaller branch displacement than CBZ. If the offset is
|
|
// out of bounds, a late MI-layer pass rewrites branches.
|
|
// 403.gcc is an example that hits this case.
|
|
if (LHS.getOpcode() == ISD::AND &&
|
|
isa<ConstantSDNode>(LHS.getOperand(1)) &&
|
|
isPowerOf2_64(LHS.getConstantOperandVal(1))) {
|
|
SDValue Test = LHS.getOperand(0);
|
|
uint64_t Mask = LHS.getConstantOperandVal(1);
|
|
|
|
// TBNZ only operates on i64's, but the ext should be free.
|
|
if (Test.getValueType() == MVT::i32)
|
|
Test = DAG.getAnyExtOrTrunc(Test, dl, MVT::i64);
|
|
|
|
return DAG.getNode(ARM64ISD::TBNZ, dl, MVT::Other, Chain, Test,
|
|
DAG.getConstant(Log2_64(Mask), MVT::i64), Dest);
|
|
}
|
|
|
|
return DAG.getNode(ARM64ISD::CBNZ, dl, MVT::Other, Chain, LHS, Dest);
|
|
}
|
|
}
|
|
|
|
SDValue CCVal;
|
|
SDValue Cmp = getARM64Cmp(LHS, RHS, CC, CCVal, DAG, dl);
|
|
return DAG.getNode(ARM64ISD::BRCOND, dl, MVT::Other, Chain, Dest, CCVal,
|
|
Cmp);
|
|
}
|
|
|
|
assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
|
|
|
|
// Unfortunately, the mapping of LLVM FP CC's onto ARM64 CC's isn't totally
|
|
// clean. Some of them require two branches to implement.
|
|
SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
|
|
ARM64CC::CondCode CC1, CC2;
|
|
changeFPCCToARM64CC(CC, CC1, CC2);
|
|
SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
|
|
SDValue BR1 =
|
|
DAG.getNode(ARM64ISD::BRCOND, dl, MVT::Other, Chain, Dest, CC1Val, Cmp);
|
|
if (CC2 != ARM64CC::AL) {
|
|
SDValue CC2Val = DAG.getConstant(CC2, MVT::i32);
|
|
return DAG.getNode(ARM64ISD::BRCOND, dl, MVT::Other, BR1, Dest, CC2Val,
|
|
Cmp);
|
|
}
|
|
|
|
return BR1;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerFCOPYSIGN(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
EVT VT = Op.getValueType();
|
|
SDLoc DL(Op);
|
|
|
|
SDValue In1 = Op.getOperand(0);
|
|
SDValue In2 = Op.getOperand(1);
|
|
EVT SrcVT = In2.getValueType();
|
|
if (SrcVT != VT) {
|
|
if (SrcVT == MVT::f32 && VT == MVT::f64)
|
|
In2 = DAG.getNode(ISD::FP_EXTEND, DL, VT, In2);
|
|
else if (SrcVT == MVT::f64 && VT == MVT::f32)
|
|
In2 = DAG.getNode(ISD::FP_ROUND, DL, VT, In2, DAG.getIntPtrConstant(0));
|
|
else
|
|
// FIXME: Src type is different, bail out for now. Can VT really be a
|
|
// vector type?
|
|
return SDValue();
|
|
}
|
|
|
|
EVT VecVT;
|
|
EVT EltVT;
|
|
SDValue EltMask, VecVal1, VecVal2;
|
|
if (VT == MVT::f32 || VT == MVT::v2f32 || VT == MVT::v4f32) {
|
|
EltVT = MVT::i32;
|
|
VecVT = MVT::v4i32;
|
|
EltMask = DAG.getConstant(0x80000000ULL, EltVT);
|
|
|
|
if (!VT.isVector()) {
|
|
VecVal1 = DAG.getTargetInsertSubreg(ARM64::ssub, DL, VecVT,
|
|
DAG.getUNDEF(VecVT), In1);
|
|
VecVal2 = DAG.getTargetInsertSubreg(ARM64::ssub, DL, VecVT,
|
|
DAG.getUNDEF(VecVT), In2);
|
|
} else {
|
|
VecVal1 = DAG.getNode(ISD::BITCAST, DL, VecVT, In1);
|
|
VecVal2 = DAG.getNode(ISD::BITCAST, DL, VecVT, In2);
|
|
}
|
|
} else if (VT == MVT::f64 || VT == MVT::v2f64) {
|
|
EltVT = MVT::i64;
|
|
VecVT = MVT::v2i64;
|
|
|
|
// We want to materialize a mask with the the high bit set, but the AdvSIMD
|
|
// immediate moves cannot materialize that in a single instruction for
|
|
// 64-bit elements. Instead, materialize zero and then negate it.
|
|
EltMask = DAG.getConstant(0, EltVT);
|
|
|
|
if (!VT.isVector()) {
|
|
VecVal1 = DAG.getTargetInsertSubreg(ARM64::dsub, DL, VecVT,
|
|
DAG.getUNDEF(VecVT), In1);
|
|
VecVal2 = DAG.getTargetInsertSubreg(ARM64::dsub, DL, VecVT,
|
|
DAG.getUNDEF(VecVT), In2);
|
|
} else {
|
|
VecVal1 = DAG.getNode(ISD::BITCAST, DL, VecVT, In1);
|
|
VecVal2 = DAG.getNode(ISD::BITCAST, DL, VecVT, In2);
|
|
}
|
|
} else {
|
|
llvm_unreachable("Invalid type for copysign!");
|
|
}
|
|
|
|
std::vector<SDValue> BuildVectorOps;
|
|
for (unsigned i = 0; i < VecVT.getVectorNumElements(); ++i)
|
|
BuildVectorOps.push_back(EltMask);
|
|
|
|
SDValue BuildVec = DAG.getNode(ISD::BUILD_VECTOR, DL, VecVT,
|
|
&BuildVectorOps[0], BuildVectorOps.size());
|
|
|
|
// If we couldn't materialize the mask above, then the mask vector will be
|
|
// the zero vector, and we need to negate it here.
|
|
if (VT == MVT::f64 || VT == MVT::v2f64) {
|
|
BuildVec = DAG.getNode(ISD::BITCAST, DL, MVT::v2f64, BuildVec);
|
|
BuildVec = DAG.getNode(ISD::FNEG, DL, MVT::v2f64, BuildVec);
|
|
BuildVec = DAG.getNode(ISD::BITCAST, DL, MVT::v2i64, BuildVec);
|
|
}
|
|
|
|
SDValue Sel =
|
|
DAG.getNode(ARM64ISD::BIT, DL, VecVT, VecVal1, VecVal2, BuildVec);
|
|
|
|
if (VT == MVT::f32)
|
|
return DAG.getTargetExtractSubreg(ARM64::ssub, DL, VT, Sel);
|
|
else if (VT == MVT::f64)
|
|
return DAG.getTargetExtractSubreg(ARM64::dsub, DL, VT, Sel);
|
|
else
|
|
return DAG.getNode(ISD::BITCAST, DL, VT, Sel);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerCTPOP(SDValue Op, SelectionDAG &DAG) const {
|
|
if (DAG.getMachineFunction().getFunction()->getAttributes().hasAttribute(
|
|
AttributeSet::FunctionIndex, Attribute::NoImplicitFloat))
|
|
return SDValue();
|
|
|
|
// While there is no integer popcount instruction, it can
|
|
// be more efficiently lowered to the following sequence that uses
|
|
// AdvSIMD registers/instructions as long as the copies to/from
|
|
// the AdvSIMD registers are cheap.
|
|
// FMOV D0, X0 // copy 64-bit int to vector, high bits zero'd
|
|
// CNT V0.8B, V0.8B // 8xbyte pop-counts
|
|
// ADDV B0, V0.8B // sum 8xbyte pop-counts
|
|
// UMOV X0, V0.B[0] // copy byte result back to integer reg
|
|
SDValue Val = Op.getOperand(0);
|
|
SDLoc DL(Op);
|
|
EVT VT = Op.getValueType();
|
|
SDValue ZeroVec = DAG.getUNDEF(MVT::v8i8);
|
|
|
|
SDValue VecVal;
|
|
if (VT == MVT::i32) {
|
|
VecVal = DAG.getNode(ISD::BITCAST, DL, MVT::f32, Val);
|
|
VecVal =
|
|
DAG.getTargetInsertSubreg(ARM64::ssub, DL, MVT::v8i8, ZeroVec, VecVal);
|
|
} else {
|
|
VecVal = DAG.getNode(ISD::BITCAST, DL, MVT::v8i8, Val);
|
|
}
|
|
|
|
SDValue CtPop = DAG.getNode(ISD::CTPOP, DL, MVT::v8i8, VecVal);
|
|
SDValue UaddLV = DAG.getNode(
|
|
ISD::INTRINSIC_WO_CHAIN, DL, MVT::i32,
|
|
DAG.getConstant(Intrinsic::arm64_neon_uaddlv, MVT::i32), CtPop);
|
|
|
|
if (VT == MVT::i64)
|
|
UaddLV = DAG.getNode(ISD::ZERO_EXTEND, DL, MVT::i64, UaddLV);
|
|
return UaddLV;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerSETCC(SDValue Op, SelectionDAG &DAG) const {
|
|
|
|
if (Op.getValueType().isVector())
|
|
return LowerVSETCC(Op, DAG);
|
|
|
|
SDValue LHS = Op.getOperand(0);
|
|
SDValue RHS = Op.getOperand(1);
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
|
|
SDLoc dl(Op);
|
|
|
|
// We chose ZeroOrOneBooleanContents, so use zero and one.
|
|
EVT VT = Op.getValueType();
|
|
SDValue TVal = DAG.getConstant(1, VT);
|
|
SDValue FVal = DAG.getConstant(0, VT);
|
|
|
|
// Handle f128 first, since one possible outcome is a normal integer
|
|
// comparison which gets picked up by the next if statement.
|
|
if (LHS.getValueType() == MVT::f128) {
|
|
softenSetCCOperands(DAG, MVT::f128, LHS, RHS, CC, dl);
|
|
|
|
// If softenSetCCOperands returned a scalar, use it.
|
|
if (RHS.getNode() == 0) {
|
|
assert(LHS.getValueType() == Op.getValueType() &&
|
|
"Unexpected setcc expansion!");
|
|
return LHS;
|
|
}
|
|
}
|
|
|
|
if (LHS.getValueType().isInteger()) {
|
|
SDValue CCVal;
|
|
SDValue Cmp =
|
|
getARM64Cmp(LHS, RHS, ISD::getSetCCInverse(CC, true), CCVal, DAG, dl);
|
|
|
|
// Note that we inverted the condition above, so we reverse the order of
|
|
// the true and false operands here. This will allow the setcc to be
|
|
// matched to a single CSINC instruction.
|
|
return DAG.getNode(ARM64ISD::CSEL, dl, VT, FVal, TVal, CCVal, Cmp);
|
|
}
|
|
|
|
// Now we know we're dealing with FP values.
|
|
assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
|
|
|
|
// If that fails, we'll need to perform an FCMP + CSEL sequence. Go ahead
|
|
// and do the comparison.
|
|
SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
|
|
|
|
ARM64CC::CondCode CC1, CC2;
|
|
changeFPCCToARM64CC(CC, CC1, CC2);
|
|
if (CC2 == ARM64CC::AL) {
|
|
changeFPCCToARM64CC(ISD::getSetCCInverse(CC, false), CC1, CC2);
|
|
SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
|
|
|
|
// Note that we inverted the condition above, so we reverse the order of
|
|
// the true and false operands here. This will allow the setcc to be
|
|
// matched to a single CSINC instruction.
|
|
return DAG.getNode(ARM64ISD::CSEL, dl, VT, FVal, TVal, CC1Val, Cmp);
|
|
} else {
|
|
// Unfortunately, the mapping of LLVM FP CC's onto ARM64 CC's isn't totally
|
|
// clean. Some of them require two CSELs to implement. As is in this case,
|
|
// we emit the first CSEL and then emit a second using the output of the
|
|
// first as the RHS. We're effectively OR'ing the two CC's together.
|
|
|
|
// FIXME: It would be nice if we could match the two CSELs to two CSINCs.
|
|
SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
|
|
SDValue CS1 = DAG.getNode(ARM64ISD::CSEL, dl, VT, TVal, FVal, CC1Val, Cmp);
|
|
|
|
SDValue CC2Val = DAG.getConstant(CC2, MVT::i32);
|
|
return DAG.getNode(ARM64ISD::CSEL, dl, VT, TVal, CS1, CC2Val, Cmp);
|
|
}
|
|
}
|
|
|
|
/// A SELECT_CC operation is really some kind of max or min if both values being
|
|
/// compared are, in some sense, equal to the results in either case. However,
|
|
/// it is permissible to compare f32 values and produce directly extended f64
|
|
/// values.
|
|
///
|
|
/// Extending the comparison operands would also be allowed, but is less likely
|
|
/// to happen in practice since their use is right here. Note that truncate
|
|
/// operations would *not* be semantically equivalent.
|
|
static bool selectCCOpsAreFMaxCompatible(SDValue Cmp, SDValue Result) {
|
|
if (Cmp == Result)
|
|
return true;
|
|
|
|
ConstantFPSDNode *CCmp = dyn_cast<ConstantFPSDNode>(Cmp);
|
|
ConstantFPSDNode *CResult = dyn_cast<ConstantFPSDNode>(Result);
|
|
if (CCmp && CResult && Cmp.getValueType() == MVT::f32 &&
|
|
Result.getValueType() == MVT::f64) {
|
|
bool Lossy;
|
|
APFloat CmpVal = CCmp->getValueAPF();
|
|
CmpVal.convert(APFloat::IEEEdouble, APFloat::rmNearestTiesToEven, &Lossy);
|
|
return CResult->getValueAPF().bitwiseIsEqual(CmpVal);
|
|
}
|
|
|
|
return Result->getOpcode() == ISD::FP_EXTEND && Result->getOperand(0) == Cmp;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerSELECT(SDValue Op, SelectionDAG &DAG) const {
|
|
SDValue CC = Op->getOperand(0);
|
|
SDValue TVal = Op->getOperand(1);
|
|
SDValue FVal = Op->getOperand(2);
|
|
SDLoc DL(Op);
|
|
|
|
unsigned Opc = CC.getOpcode();
|
|
// Optimize {s|u}{add|sub|mul}.with.overflow feeding into a select
|
|
// instruction.
|
|
if (CC.getResNo() == 1 &&
|
|
(Opc == ISD::SADDO || Opc == ISD::UADDO || Opc == ISD::SSUBO ||
|
|
Opc == ISD::USUBO || Opc == ISD::SMULO || Opc == ISD::UMULO)) {
|
|
// Only lower legal XALUO ops.
|
|
if (!DAG.getTargetLoweringInfo().isTypeLegal(CC->getValueType(0)))
|
|
return SDValue();
|
|
|
|
ARM64CC::CondCode OFCC;
|
|
SDValue Value, Overflow;
|
|
std::tie(Value, Overflow) = getARM64XALUOOp(OFCC, CC.getValue(0), DAG);
|
|
SDValue CCVal = DAG.getConstant(OFCC, MVT::i32);
|
|
|
|
return DAG.getNode(ARM64ISD::CSEL, DL, Op.getValueType(), TVal, FVal, CCVal,
|
|
Overflow);
|
|
}
|
|
|
|
if (CC.getOpcode() == ISD::SETCC)
|
|
return DAG.getSelectCC(DL, CC.getOperand(0), CC.getOperand(1), TVal, FVal,
|
|
cast<CondCodeSDNode>(CC.getOperand(2))->get());
|
|
else
|
|
return DAG.getSelectCC(DL, CC, DAG.getConstant(0, CC.getValueType()), TVal,
|
|
FVal, ISD::SETNE);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerSELECT_CC(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
|
|
SDValue LHS = Op.getOperand(0);
|
|
SDValue RHS = Op.getOperand(1);
|
|
SDValue TVal = Op.getOperand(2);
|
|
SDValue FVal = Op.getOperand(3);
|
|
SDLoc dl(Op);
|
|
|
|
// Handle f128 first, because it will result in a comparison of some RTLIB
|
|
// call result against zero.
|
|
if (LHS.getValueType() == MVT::f128) {
|
|
softenSetCCOperands(DAG, MVT::f128, LHS, RHS, CC, dl);
|
|
|
|
// If softenSetCCOperands returned a scalar, we need to compare the result
|
|
// against zero to select between true and false values.
|
|
if (RHS.getNode() == 0) {
|
|
RHS = DAG.getConstant(0, LHS.getValueType());
|
|
CC = ISD::SETNE;
|
|
}
|
|
}
|
|
|
|
// Handle integers first.
|
|
if (LHS.getValueType().isInteger()) {
|
|
assert((LHS.getValueType() == RHS.getValueType()) &&
|
|
(LHS.getValueType() == MVT::i32 || LHS.getValueType() == MVT::i64));
|
|
|
|
unsigned Opcode = ARM64ISD::CSEL;
|
|
|
|
// If both the TVal and the FVal are constants, see if we can swap them in
|
|
// order to for a CSINV or CSINC out of them.
|
|
ConstantSDNode *CFVal = dyn_cast<ConstantSDNode>(FVal);
|
|
ConstantSDNode *CTVal = dyn_cast<ConstantSDNode>(TVal);
|
|
|
|
if (CTVal && CFVal && CTVal->isAllOnesValue() && CFVal->isNullValue()) {
|
|
std::swap(TVal, FVal);
|
|
std::swap(CTVal, CFVal);
|
|
CC = ISD::getSetCCInverse(CC, true);
|
|
} else if (CTVal && CFVal && CTVal->isOne() && CFVal->isNullValue()) {
|
|
std::swap(TVal, FVal);
|
|
std::swap(CTVal, CFVal);
|
|
CC = ISD::getSetCCInverse(CC, true);
|
|
} else if (TVal.getOpcode() == ISD::XOR) {
|
|
// If TVal is a NOT we want to swap TVal and FVal so that we can match
|
|
// with a CSINV rather than a CSEL.
|
|
ConstantSDNode *CVal = dyn_cast<ConstantSDNode>(TVal.getOperand(1));
|
|
|
|
if (CVal && CVal->isAllOnesValue()) {
|
|
std::swap(TVal, FVal);
|
|
std::swap(CTVal, CFVal);
|
|
CC = ISD::getSetCCInverse(CC, true);
|
|
}
|
|
} else if (TVal.getOpcode() == ISD::SUB) {
|
|
// If TVal is a negation (SUB from 0) we want to swap TVal and FVal so
|
|
// that we can match with a CSNEG rather than a CSEL.
|
|
ConstantSDNode *CVal = dyn_cast<ConstantSDNode>(TVal.getOperand(0));
|
|
|
|
if (CVal && CVal->isNullValue()) {
|
|
std::swap(TVal, FVal);
|
|
std::swap(CTVal, CFVal);
|
|
CC = ISD::getSetCCInverse(CC, true);
|
|
}
|
|
} else if (CTVal && CFVal) {
|
|
const int64_t TrueVal = CTVal->getSExtValue();
|
|
const int64_t FalseVal = CFVal->getSExtValue();
|
|
bool Swap = false;
|
|
|
|
// If both TVal and FVal are constants, see if FVal is the
|
|
// inverse/negation/increment of TVal and generate a CSINV/CSNEG/CSINC
|
|
// instead of a CSEL in that case.
|
|
if (TrueVal == ~FalseVal) {
|
|
Opcode = ARM64ISD::CSINV;
|
|
} else if (TrueVal == -FalseVal) {
|
|
Opcode = ARM64ISD::CSNEG;
|
|
} else if (TVal.getValueType() == MVT::i32) {
|
|
// If our operands are only 32-bit wide, make sure we use 32-bit
|
|
// arithmetic for the check whether we can use CSINC. This ensures that
|
|
// the addition in the check will wrap around properly in case there is
|
|
// an overflow (which would not be the case if we do the check with
|
|
// 64-bit arithmetic).
|
|
const uint32_t TrueVal32 = CTVal->getZExtValue();
|
|
const uint32_t FalseVal32 = CFVal->getZExtValue();
|
|
|
|
if ((TrueVal32 == FalseVal32 + 1) || (TrueVal32 + 1 == FalseVal32)) {
|
|
Opcode = ARM64ISD::CSINC;
|
|
|
|
if (TrueVal32 > FalseVal32) {
|
|
Swap = true;
|
|
}
|
|
}
|
|
// 64-bit check whether we can use CSINC.
|
|
} else if ((TrueVal == FalseVal + 1) || (TrueVal + 1 == FalseVal)) {
|
|
Opcode = ARM64ISD::CSINC;
|
|
|
|
if (TrueVal > FalseVal) {
|
|
Swap = true;
|
|
}
|
|
}
|
|
|
|
// Swap TVal and FVal if necessary.
|
|
if (Swap) {
|
|
std::swap(TVal, FVal);
|
|
std::swap(CTVal, CFVal);
|
|
CC = ISD::getSetCCInverse(CC, true);
|
|
}
|
|
|
|
if (Opcode != ARM64ISD::CSEL) {
|
|
// Drop FVal since we can get its value by simply inverting/negating
|
|
// TVal.
|
|
FVal = TVal;
|
|
}
|
|
}
|
|
|
|
SDValue CCVal;
|
|
SDValue Cmp = getARM64Cmp(LHS, RHS, CC, CCVal, DAG, dl);
|
|
|
|
EVT VT = Op.getValueType();
|
|
return DAG.getNode(Opcode, dl, VT, TVal, FVal, CCVal, Cmp);
|
|
}
|
|
|
|
// Now we know we're dealing with FP values.
|
|
assert(LHS.getValueType() == MVT::f32 || LHS.getValueType() == MVT::f64);
|
|
assert(LHS.getValueType() == RHS.getValueType());
|
|
EVT VT = Op.getValueType();
|
|
|
|
// Try to match this select into a max/min operation, which have dedicated
|
|
// opcode in the instruction set.
|
|
// NOTE: This is not correct in the presence of NaNs, so we only enable this
|
|
// in no-NaNs mode.
|
|
if (getTargetMachine().Options.NoNaNsFPMath) {
|
|
if (selectCCOpsAreFMaxCompatible(LHS, FVal) &&
|
|
selectCCOpsAreFMaxCompatible(RHS, TVal)) {
|
|
CC = ISD::getSetCCSwappedOperands(CC);
|
|
std::swap(TVal, FVal);
|
|
}
|
|
|
|
if (selectCCOpsAreFMaxCompatible(LHS, TVal) &&
|
|
selectCCOpsAreFMaxCompatible(RHS, FVal)) {
|
|
switch (CC) {
|
|
default:
|
|
break;
|
|
case ISD::SETGT:
|
|
case ISD::SETGE:
|
|
case ISD::SETUGT:
|
|
case ISD::SETUGE:
|
|
case ISD::SETOGT:
|
|
case ISD::SETOGE:
|
|
return DAG.getNode(ARM64ISD::FMAX, dl, VT, TVal, FVal);
|
|
break;
|
|
case ISD::SETLT:
|
|
case ISD::SETLE:
|
|
case ISD::SETULT:
|
|
case ISD::SETULE:
|
|
case ISD::SETOLT:
|
|
case ISD::SETOLE:
|
|
return DAG.getNode(ARM64ISD::FMIN, dl, VT, TVal, FVal);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
// If that fails, we'll need to perform an FCMP + CSEL sequence. Go ahead
|
|
// and do the comparison.
|
|
SDValue Cmp = emitComparison(LHS, RHS, CC, dl, DAG);
|
|
|
|
// Unfortunately, the mapping of LLVM FP CC's onto ARM64 CC's isn't totally
|
|
// clean. Some of them require two CSELs to implement.
|
|
ARM64CC::CondCode CC1, CC2;
|
|
changeFPCCToARM64CC(CC, CC1, CC2);
|
|
SDValue CC1Val = DAG.getConstant(CC1, MVT::i32);
|
|
SDValue CS1 = DAG.getNode(ARM64ISD::CSEL, dl, VT, TVal, FVal, CC1Val, Cmp);
|
|
|
|
// If we need a second CSEL, emit it, using the output of the first as the
|
|
// RHS. We're effectively OR'ing the two CC's together.
|
|
if (CC2 != ARM64CC::AL) {
|
|
SDValue CC2Val = DAG.getConstant(CC2, MVT::i32);
|
|
return DAG.getNode(ARM64ISD::CSEL, dl, VT, TVal, CS1, CC2Val, Cmp);
|
|
}
|
|
|
|
// Otherwise, return the output of the first CSEL.
|
|
return CS1;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerJumpTable(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
// Jump table entries as PC relative offsets. No additional tweaking
|
|
// is necessary here. Just get the address of the jump table.
|
|
JumpTableSDNode *JT = cast<JumpTableSDNode>(Op);
|
|
EVT PtrVT = getPointerTy();
|
|
SDLoc DL(Op);
|
|
|
|
if (getTargetMachine().getCodeModel() == CodeModel::Large &&
|
|
!Subtarget->isTargetMachO()) {
|
|
const unsigned char MO_NC = ARM64II::MO_NC;
|
|
return DAG.getNode(
|
|
ARM64ISD::WrapperLarge, DL, PtrVT,
|
|
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, ARM64II::MO_G3),
|
|
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, ARM64II::MO_G2 | MO_NC),
|
|
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, ARM64II::MO_G1 | MO_NC),
|
|
DAG.getTargetJumpTable(JT->getIndex(), PtrVT, ARM64II::MO_G0 | MO_NC));
|
|
}
|
|
|
|
SDValue Hi = DAG.getTargetJumpTable(JT->getIndex(), PtrVT, ARM64II::MO_PAGE);
|
|
SDValue Lo = DAG.getTargetJumpTable(JT->getIndex(), PtrVT,
|
|
ARM64II::MO_PAGEOFF | ARM64II::MO_NC);
|
|
SDValue ADRP = DAG.getNode(ARM64ISD::ADRP, DL, PtrVT, Hi);
|
|
return DAG.getNode(ARM64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerConstantPool(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
ConstantPoolSDNode *CP = cast<ConstantPoolSDNode>(Op);
|
|
EVT PtrVT = getPointerTy();
|
|
SDLoc DL(Op);
|
|
|
|
if (getTargetMachine().getCodeModel() == CodeModel::Large) {
|
|
// Use the GOT for the large code model on iOS.
|
|
if (Subtarget->isTargetMachO()) {
|
|
SDValue GotAddr = DAG.getTargetConstantPool(
|
|
CP->getConstVal(), PtrVT, CP->getAlignment(), CP->getOffset(),
|
|
ARM64II::MO_GOT);
|
|
return DAG.getNode(ARM64ISD::LOADgot, DL, PtrVT, GotAddr);
|
|
}
|
|
|
|
const unsigned char MO_NC = ARM64II::MO_NC;
|
|
return DAG.getNode(
|
|
ARM64ISD::WrapperLarge, DL, PtrVT,
|
|
DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
|
|
CP->getOffset(), ARM64II::MO_G3),
|
|
DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
|
|
CP->getOffset(), ARM64II::MO_G2 | MO_NC),
|
|
DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
|
|
CP->getOffset(), ARM64II::MO_G1 | MO_NC),
|
|
DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
|
|
CP->getOffset(), ARM64II::MO_G0 | MO_NC));
|
|
} else {
|
|
// Use ADRP/ADD or ADRP/LDR for everything else: the small memory model on
|
|
// ELF, the only valid one on Darwin.
|
|
SDValue Hi =
|
|
DAG.getTargetConstantPool(CP->getConstVal(), PtrVT, CP->getAlignment(),
|
|
CP->getOffset(), ARM64II::MO_PAGE);
|
|
SDValue Lo = DAG.getTargetConstantPool(
|
|
CP->getConstVal(), PtrVT, CP->getAlignment(), CP->getOffset(),
|
|
ARM64II::MO_PAGEOFF | ARM64II::MO_NC);
|
|
|
|
SDValue ADRP = DAG.getNode(ARM64ISD::ADRP, DL, PtrVT, Hi);
|
|
return DAG.getNode(ARM64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
|
|
}
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerBlockAddress(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
const BlockAddress *BA = cast<BlockAddressSDNode>(Op)->getBlockAddress();
|
|
EVT PtrVT = getPointerTy();
|
|
SDLoc DL(Op);
|
|
if (getTargetMachine().getCodeModel() == CodeModel::Large &&
|
|
!Subtarget->isTargetMachO()) {
|
|
const unsigned char MO_NC = ARM64II::MO_NC;
|
|
return DAG.getNode(
|
|
ARM64ISD::WrapperLarge, DL, PtrVT,
|
|
DAG.getTargetBlockAddress(BA, PtrVT, 0, ARM64II::MO_G3),
|
|
DAG.getTargetBlockAddress(BA, PtrVT, 0, ARM64II::MO_G2 | MO_NC),
|
|
DAG.getTargetBlockAddress(BA, PtrVT, 0, ARM64II::MO_G1 | MO_NC),
|
|
DAG.getTargetBlockAddress(BA, PtrVT, 0, ARM64II::MO_G0 | MO_NC));
|
|
} else {
|
|
SDValue Hi = DAG.getTargetBlockAddress(BA, PtrVT, 0, ARM64II::MO_PAGE);
|
|
SDValue Lo = DAG.getTargetBlockAddress(BA, PtrVT, 0, ARM64II::MO_PAGEOFF |
|
|
ARM64II::MO_NC);
|
|
SDValue ADRP = DAG.getNode(ARM64ISD::ADRP, DL, PtrVT, Hi);
|
|
return DAG.getNode(ARM64ISD::ADDlow, DL, PtrVT, ADRP, Lo);
|
|
}
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerDarwin_VASTART(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
ARM64FunctionInfo *FuncInfo =
|
|
DAG.getMachineFunction().getInfo<ARM64FunctionInfo>();
|
|
|
|
SDLoc DL(Op);
|
|
SDValue FR =
|
|
DAG.getFrameIndex(FuncInfo->getVarArgsStackIndex(), getPointerTy());
|
|
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
|
|
return DAG.getStore(Op.getOperand(0), DL, FR, Op.getOperand(1),
|
|
MachinePointerInfo(SV), false, false, 0);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerAAPCS_VASTART(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
// The layout of the va_list struct is specified in the AArch64 Procedure Call
|
|
// Standard, section B.3.
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
ARM64FunctionInfo *FuncInfo = MF.getInfo<ARM64FunctionInfo>();
|
|
SDLoc DL(Op);
|
|
|
|
SDValue Chain = Op.getOperand(0);
|
|
SDValue VAList = Op.getOperand(1);
|
|
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
|
|
SmallVector<SDValue, 4> MemOps;
|
|
|
|
// void *__stack at offset 0
|
|
SDValue Stack =
|
|
DAG.getFrameIndex(FuncInfo->getVarArgsStackIndex(), getPointerTy());
|
|
MemOps.push_back(DAG.getStore(Chain, DL, Stack, VAList,
|
|
MachinePointerInfo(SV), false, false, 8));
|
|
|
|
// void *__gr_top at offset 8
|
|
int GPRSize = FuncInfo->getVarArgsGPRSize();
|
|
if (GPRSize > 0) {
|
|
SDValue GRTop, GRTopAddr;
|
|
|
|
GRTopAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
|
|
DAG.getConstant(8, getPointerTy()));
|
|
|
|
GRTop = DAG.getFrameIndex(FuncInfo->getVarArgsGPRIndex(), getPointerTy());
|
|
GRTop = DAG.getNode(ISD::ADD, DL, getPointerTy(), GRTop,
|
|
DAG.getConstant(GPRSize, getPointerTy()));
|
|
|
|
MemOps.push_back(DAG.getStore(Chain, DL, GRTop, GRTopAddr,
|
|
MachinePointerInfo(SV, 8), false, false, 8));
|
|
}
|
|
|
|
// void *__vr_top at offset 16
|
|
int FPRSize = FuncInfo->getVarArgsFPRSize();
|
|
if (FPRSize > 0) {
|
|
SDValue VRTop, VRTopAddr;
|
|
VRTopAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
|
|
DAG.getConstant(16, getPointerTy()));
|
|
|
|
VRTop = DAG.getFrameIndex(FuncInfo->getVarArgsFPRIndex(), getPointerTy());
|
|
VRTop = DAG.getNode(ISD::ADD, DL, getPointerTy(), VRTop,
|
|
DAG.getConstant(FPRSize, getPointerTy()));
|
|
|
|
MemOps.push_back(DAG.getStore(Chain, DL, VRTop, VRTopAddr,
|
|
MachinePointerInfo(SV, 16), false, false, 8));
|
|
}
|
|
|
|
// int __gr_offs at offset 24
|
|
SDValue GROffsAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
|
|
DAG.getConstant(24, getPointerTy()));
|
|
MemOps.push_back(DAG.getStore(Chain, DL, DAG.getConstant(-GPRSize, MVT::i32),
|
|
GROffsAddr, MachinePointerInfo(SV, 24), false,
|
|
false, 4));
|
|
|
|
// int __vr_offs at offset 28
|
|
SDValue VROffsAddr = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
|
|
DAG.getConstant(28, getPointerTy()));
|
|
MemOps.push_back(DAG.getStore(Chain, DL, DAG.getConstant(-FPRSize, MVT::i32),
|
|
VROffsAddr, MachinePointerInfo(SV, 28), false,
|
|
false, 4));
|
|
|
|
return DAG.getNode(ISD::TokenFactor, DL, MVT::Other, &MemOps[0],
|
|
MemOps.size());
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVASTART(SDValue Op, SelectionDAG &DAG) const {
|
|
return Subtarget->isTargetDarwin() ? LowerDarwin_VASTART(Op, DAG)
|
|
: LowerAAPCS_VASTART(Op, DAG);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVACOPY(SDValue Op, SelectionDAG &DAG) const {
|
|
// AAPCS has three pointers and two ints (= 32 bytes), Darwin has single
|
|
// pointer.
|
|
unsigned VaListSize = Subtarget->isTargetDarwin() ? 8 : 32;
|
|
const Value *DestSV = cast<SrcValueSDNode>(Op.getOperand(3))->getValue();
|
|
const Value *SrcSV = cast<SrcValueSDNode>(Op.getOperand(4))->getValue();
|
|
|
|
return DAG.getMemcpy(Op.getOperand(0), SDLoc(Op), Op.getOperand(1),
|
|
Op.getOperand(2), DAG.getConstant(VaListSize, MVT::i32),
|
|
8, false, false, MachinePointerInfo(DestSV),
|
|
MachinePointerInfo(SrcSV));
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVAARG(SDValue Op, SelectionDAG &DAG) const {
|
|
assert(Subtarget->isTargetDarwin() &&
|
|
"automatic va_arg instruction only works on Darwin");
|
|
|
|
const Value *V = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
|
|
EVT VT = Op.getValueType();
|
|
SDLoc DL(Op);
|
|
SDValue Chain = Op.getOperand(0);
|
|
SDValue Addr = Op.getOperand(1);
|
|
unsigned Align = Op.getConstantOperandVal(3);
|
|
|
|
SDValue VAList = DAG.getLoad(getPointerTy(), DL, Chain, Addr,
|
|
MachinePointerInfo(V), false, false, false, 0);
|
|
Chain = VAList.getValue(1);
|
|
|
|
if (Align > 8) {
|
|
assert(((Align & (Align - 1)) == 0) && "Expected Align to be a power of 2");
|
|
VAList = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
|
|
DAG.getConstant(Align - 1, getPointerTy()));
|
|
VAList = DAG.getNode(ISD::AND, DL, getPointerTy(), VAList,
|
|
DAG.getConstant(-(int64_t)Align, getPointerTy()));
|
|
}
|
|
|
|
Type *ArgTy = VT.getTypeForEVT(*DAG.getContext());
|
|
uint64_t ArgSize = getDataLayout()->getTypeAllocSize(ArgTy);
|
|
|
|
// Scalar integer and FP values smaller than 64 bits are implicitly extended
|
|
// up to 64 bits. At the very least, we have to increase the striding of the
|
|
// vaargs list to match this, and for FP values we need to introduce
|
|
// FP_ROUND nodes as well.
|
|
if (VT.isInteger() && !VT.isVector())
|
|
ArgSize = 8;
|
|
bool NeedFPTrunc = false;
|
|
if (VT.isFloatingPoint() && !VT.isVector() && VT != MVT::f64) {
|
|
ArgSize = 8;
|
|
NeedFPTrunc = true;
|
|
}
|
|
|
|
// Increment the pointer, VAList, to the next vaarg
|
|
SDValue VANext = DAG.getNode(ISD::ADD, DL, getPointerTy(), VAList,
|
|
DAG.getConstant(ArgSize, getPointerTy()));
|
|
// Store the incremented VAList to the legalized pointer
|
|
SDValue APStore = DAG.getStore(Chain, DL, VANext, Addr, MachinePointerInfo(V),
|
|
false, false, 0);
|
|
|
|
// Load the actual argument out of the pointer VAList
|
|
if (NeedFPTrunc) {
|
|
// Load the value as an f64.
|
|
SDValue WideFP = DAG.getLoad(MVT::f64, DL, APStore, VAList,
|
|
MachinePointerInfo(), false, false, false, 0);
|
|
// Round the value down to an f32.
|
|
SDValue NarrowFP = DAG.getNode(ISD::FP_ROUND, DL, VT, WideFP.getValue(0),
|
|
DAG.getIntPtrConstant(1));
|
|
SDValue Ops[] = { NarrowFP, WideFP.getValue(1) };
|
|
// Merge the rounded value with the chain output of the load.
|
|
return DAG.getMergeValues(Ops, 2, DL);
|
|
}
|
|
|
|
return DAG.getLoad(VT, DL, APStore, VAList, MachinePointerInfo(), false,
|
|
false, false, 0);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerFRAMEADDR(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
|
|
MFI->setFrameAddressIsTaken(true);
|
|
|
|
EVT VT = Op.getValueType();
|
|
SDLoc DL(Op);
|
|
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
|
|
SDValue FrameAddr = DAG.getCopyFromReg(DAG.getEntryNode(), DL, ARM64::FP, VT);
|
|
while (Depth--)
|
|
FrameAddr = DAG.getLoad(VT, DL, DAG.getEntryNode(), FrameAddr,
|
|
MachinePointerInfo(), false, false, false, 0);
|
|
return FrameAddr;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerRETURNADDR(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
MachineFrameInfo *MFI = MF.getFrameInfo();
|
|
MFI->setReturnAddressIsTaken(true);
|
|
|
|
EVT VT = Op.getValueType();
|
|
SDLoc DL(Op);
|
|
unsigned Depth = cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue();
|
|
if (Depth) {
|
|
SDValue FrameAddr = LowerFRAMEADDR(Op, DAG);
|
|
SDValue Offset = DAG.getConstant(8, getPointerTy());
|
|
return DAG.getLoad(VT, DL, DAG.getEntryNode(),
|
|
DAG.getNode(ISD::ADD, DL, VT, FrameAddr, Offset),
|
|
MachinePointerInfo(), false, false, false, 0);
|
|
}
|
|
|
|
// Return LR, which contains the return address. Mark it an implicit live-in.
|
|
unsigned Reg = MF.addLiveIn(ARM64::LR, &ARM64::GPR64RegClass);
|
|
return DAG.getCopyFromReg(DAG.getEntryNode(), DL, Reg, VT);
|
|
}
|
|
|
|
/// LowerShiftRightParts - Lower SRA_PARTS, which returns two
|
|
/// i64 values and take a 2 x i64 value to shift plus a shift amount.
|
|
SDValue ARM64TargetLowering::LowerShiftRightParts(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
assert(Op.getNumOperands() == 3 && "Not a double-shift!");
|
|
EVT VT = Op.getValueType();
|
|
unsigned VTBits = VT.getSizeInBits();
|
|
SDLoc dl(Op);
|
|
SDValue ShOpLo = Op.getOperand(0);
|
|
SDValue ShOpHi = Op.getOperand(1);
|
|
SDValue ShAmt = Op.getOperand(2);
|
|
SDValue ARMcc;
|
|
unsigned Opc = (Op.getOpcode() == ISD::SRA_PARTS) ? ISD::SRA : ISD::SRL;
|
|
|
|
assert(Op.getOpcode() == ISD::SRA_PARTS || Op.getOpcode() == ISD::SRL_PARTS);
|
|
|
|
SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64,
|
|
DAG.getConstant(VTBits, MVT::i64), ShAmt);
|
|
SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, ShAmt);
|
|
SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64, ShAmt,
|
|
DAG.getConstant(VTBits, MVT::i64));
|
|
SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, RevShAmt);
|
|
|
|
SDValue Cmp = emitComparison(ExtraShAmt, DAG.getConstant(0, MVT::i64),
|
|
ISD::SETGE, dl, DAG);
|
|
SDValue CCVal = DAG.getConstant(ARM64CC::GE, MVT::i32);
|
|
|
|
SDValue FalseValLo = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
|
|
SDValue TrueValLo = DAG.getNode(Opc, dl, VT, ShOpHi, ExtraShAmt);
|
|
SDValue Lo =
|
|
DAG.getNode(ARM64ISD::CSEL, dl, VT, TrueValLo, FalseValLo, CCVal, Cmp);
|
|
|
|
// ARM64 shifts larger than the register width are wrapped rather than
|
|
// clamped, so we can't just emit "hi >> x".
|
|
SDValue FalseValHi = DAG.getNode(Opc, dl, VT, ShOpHi, ShAmt);
|
|
SDValue TrueValHi = Opc == ISD::SRA
|
|
? DAG.getNode(Opc, dl, VT, ShOpHi,
|
|
DAG.getConstant(VTBits - 1, MVT::i64))
|
|
: DAG.getConstant(0, VT);
|
|
SDValue Hi =
|
|
DAG.getNode(ARM64ISD::CSEL, dl, VT, TrueValHi, FalseValHi, CCVal, Cmp);
|
|
|
|
SDValue Ops[2] = { Lo, Hi };
|
|
return DAG.getMergeValues(Ops, 2, dl);
|
|
}
|
|
|
|
/// LowerShiftLeftParts - Lower SHL_PARTS, which returns two
|
|
/// i64 values and take a 2 x i64 value to shift plus a shift amount.
|
|
SDValue ARM64TargetLowering::LowerShiftLeftParts(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
assert(Op.getNumOperands() == 3 && "Not a double-shift!");
|
|
EVT VT = Op.getValueType();
|
|
unsigned VTBits = VT.getSizeInBits();
|
|
SDLoc dl(Op);
|
|
SDValue ShOpLo = Op.getOperand(0);
|
|
SDValue ShOpHi = Op.getOperand(1);
|
|
SDValue ShAmt = Op.getOperand(2);
|
|
SDValue ARMcc;
|
|
|
|
assert(Op.getOpcode() == ISD::SHL_PARTS);
|
|
SDValue RevShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64,
|
|
DAG.getConstant(VTBits, MVT::i64), ShAmt);
|
|
SDValue Tmp1 = DAG.getNode(ISD::SRL, dl, VT, ShOpLo, RevShAmt);
|
|
SDValue ExtraShAmt = DAG.getNode(ISD::SUB, dl, MVT::i64, ShAmt,
|
|
DAG.getConstant(VTBits, MVT::i64));
|
|
SDValue Tmp2 = DAG.getNode(ISD::SHL, dl, VT, ShOpHi, ShAmt);
|
|
SDValue Tmp3 = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ExtraShAmt);
|
|
|
|
SDValue FalseVal = DAG.getNode(ISD::OR, dl, VT, Tmp1, Tmp2);
|
|
|
|
SDValue Cmp = emitComparison(ExtraShAmt, DAG.getConstant(0, MVT::i64),
|
|
ISD::SETGE, dl, DAG);
|
|
SDValue CCVal = DAG.getConstant(ARM64CC::GE, MVT::i32);
|
|
SDValue Hi = DAG.getNode(ARM64ISD::CSEL, dl, VT, Tmp3, FalseVal, CCVal, Cmp);
|
|
|
|
// ARM64 shifts of larger than register sizes are wrapped rather than clamped,
|
|
// so we can't just emit "lo << a" if a is too big.
|
|
SDValue TrueValLo = DAG.getConstant(0, VT);
|
|
SDValue FalseValLo = DAG.getNode(ISD::SHL, dl, VT, ShOpLo, ShAmt);
|
|
SDValue Lo =
|
|
DAG.getNode(ARM64ISD::CSEL, dl, VT, TrueValLo, FalseValLo, CCVal, Cmp);
|
|
|
|
SDValue Ops[2] = { Lo, Hi };
|
|
return DAG.getMergeValues(Ops, 2, dl);
|
|
}
|
|
|
|
bool
|
|
ARM64TargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
|
|
// The ARM64 target doesn't support folding offsets into global addresses.
|
|
return false;
|
|
}
|
|
|
|
bool ARM64TargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
|
|
// We can materialize #0.0 as fmov $Rd, XZR for 64-bit and 32-bit cases.
|
|
// FIXME: We should be able to handle f128 as well with a clever lowering.
|
|
if (Imm.isPosZero() && (VT == MVT::f64 || VT == MVT::f32))
|
|
return true;
|
|
|
|
if (VT == MVT::f64)
|
|
return ARM64_AM::getFP64Imm(Imm) != -1;
|
|
else if (VT == MVT::f32)
|
|
return ARM64_AM::getFP32Imm(Imm) != -1;
|
|
return false;
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ARM64 Optimization Hooks
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ARM64 Inline Assembly Support
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// Table of Constraints
|
|
// TODO: This is the current set of constraints supported by ARM for the
|
|
// compiler, not all of them may make sense, e.g. S may be difficult to support.
|
|
//
|
|
// r - A general register
|
|
// w - An FP/SIMD register of some size in the range v0-v31
|
|
// x - An FP/SIMD register of some size in the range v0-v15
|
|
// I - Constant that can be used with an ADD instruction
|
|
// J - Constant that can be used with a SUB instruction
|
|
// K - Constant that can be used with a 32-bit logical instruction
|
|
// L - Constant that can be used with a 64-bit logical instruction
|
|
// M - Constant that can be used as a 32-bit MOV immediate
|
|
// N - Constant that can be used as a 64-bit MOV immediate
|
|
// Q - A memory reference with base register and no offset
|
|
// S - A symbolic address
|
|
// Y - Floating point constant zero
|
|
// Z - Integer constant zero
|
|
//
|
|
// Note that general register operands will be output using their 64-bit x
|
|
// register name, whatever the size of the variable, unless the asm operand
|
|
// is prefixed by the %w modifier. Floating-point and SIMD register operands
|
|
// will be output with the v prefix unless prefixed by the %b, %h, %s, %d or
|
|
// %q modifier.
|
|
|
|
/// getConstraintType - Given a constraint letter, return the type of
|
|
/// constraint it is for this target.
|
|
ARM64TargetLowering::ConstraintType
|
|
ARM64TargetLowering::getConstraintType(const std::string &Constraint) const {
|
|
if (Constraint.size() == 1) {
|
|
switch (Constraint[0]) {
|
|
default:
|
|
break;
|
|
case 'z':
|
|
return C_Other;
|
|
case 'x':
|
|
case 'w':
|
|
return C_RegisterClass;
|
|
// An address with a single base register. Due to the way we
|
|
// currently handle addresses it is the same as 'r'.
|
|
case 'Q':
|
|
return C_Memory;
|
|
}
|
|
}
|
|
return TargetLowering::getConstraintType(Constraint);
|
|
}
|
|
|
|
/// Examine constraint type and operand type and determine a weight value.
|
|
/// This object must already have been set up with the operand type
|
|
/// and the current alternative constraint selected.
|
|
TargetLowering::ConstraintWeight
|
|
ARM64TargetLowering::getSingleConstraintMatchWeight(
|
|
AsmOperandInfo &info, const char *constraint) const {
|
|
ConstraintWeight weight = CW_Invalid;
|
|
Value *CallOperandVal = info.CallOperandVal;
|
|
// If we don't have a value, we can't do a match,
|
|
// but allow it at the lowest weight.
|
|
if (CallOperandVal == NULL)
|
|
return CW_Default;
|
|
Type *type = CallOperandVal->getType();
|
|
// Look at the constraint type.
|
|
switch (*constraint) {
|
|
default:
|
|
weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
|
|
break;
|
|
case 'x':
|
|
case 'w':
|
|
if (type->isFloatingPointTy() || type->isVectorTy())
|
|
weight = CW_Register;
|
|
break;
|
|
case 'z':
|
|
weight = CW_Constant;
|
|
break;
|
|
}
|
|
return weight;
|
|
}
|
|
|
|
std::pair<unsigned, const TargetRegisterClass *>
|
|
ARM64TargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
|
|
MVT VT) const {
|
|
if (Constraint.size() == 1) {
|
|
switch (Constraint[0]) {
|
|
case 'r':
|
|
if (VT.getSizeInBits() == 64)
|
|
return std::make_pair(0U, &ARM64::GPR64commonRegClass);
|
|
return std::make_pair(0U, &ARM64::GPR32commonRegClass);
|
|
case 'w':
|
|
if (VT == MVT::f32)
|
|
return std::make_pair(0U, &ARM64::FPR32RegClass);
|
|
if (VT.getSizeInBits() == 64)
|
|
return std::make_pair(0U, &ARM64::FPR64RegClass);
|
|
if (VT.getSizeInBits() == 128)
|
|
return std::make_pair(0U, &ARM64::FPR128RegClass);
|
|
break;
|
|
// The instructions that this constraint is designed for can
|
|
// only take 128-bit registers so just use that regclass.
|
|
case 'x':
|
|
if (VT.getSizeInBits() == 128)
|
|
return std::make_pair(0U, &ARM64::FPR128_loRegClass);
|
|
break;
|
|
}
|
|
}
|
|
if (StringRef("{cc}").equals_lower(Constraint))
|
|
return std::make_pair(unsigned(ARM64::CPSR), &ARM64::CCRRegClass);
|
|
|
|
// Use the default implementation in TargetLowering to convert the register
|
|
// constraint into a member of a register class.
|
|
std::pair<unsigned, const TargetRegisterClass *> Res;
|
|
Res = TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
|
|
|
|
// Not found as a standard register?
|
|
if (Res.second == 0) {
|
|
unsigned Size = Constraint.size();
|
|
if ((Size == 4 || Size == 5) && Constraint[0] == '{' &&
|
|
tolower(Constraint[1]) == 'v' && Constraint[Size - 1] == '}') {
|
|
const std::string Reg =
|
|
std::string(&Constraint[2], &Constraint[Size - 1]);
|
|
int RegNo = atoi(Reg.c_str());
|
|
if (RegNo >= 0 && RegNo <= 31) {
|
|
// v0 - v31 are aliases of q0 - q31.
|
|
// By default we'll emit v0-v31 for this unless there's a modifier where
|
|
// we'll emit the correct register as well.
|
|
Res.first = ARM64::FPR128RegClass.getRegister(RegNo);
|
|
Res.second = &ARM64::FPR128RegClass;
|
|
}
|
|
}
|
|
}
|
|
|
|
return Res;
|
|
}
|
|
|
|
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
|
|
/// vector. If it is invalid, don't add anything to Ops.
|
|
void ARM64TargetLowering::LowerAsmOperandForConstraint(
|
|
SDValue Op, std::string &Constraint, std::vector<SDValue> &Ops,
|
|
SelectionDAG &DAG) const {
|
|
SDValue Result(0, 0);
|
|
|
|
// Currently only support length 1 constraints.
|
|
if (Constraint.length() != 1)
|
|
return;
|
|
|
|
char ConstraintLetter = Constraint[0];
|
|
switch (ConstraintLetter) {
|
|
default:
|
|
break;
|
|
|
|
// This set of constraints deal with valid constants for various instructions.
|
|
// Validate and return a target constant for them if we can.
|
|
case 'z': {
|
|
// 'z' maps to xzr or wzr so it needs an input of 0.
|
|
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
|
|
if (!C || C->getZExtValue() != 0)
|
|
return;
|
|
|
|
if (Op.getValueType() == MVT::i64)
|
|
Result = DAG.getRegister(ARM64::XZR, MVT::i64);
|
|
else
|
|
Result = DAG.getRegister(ARM64::WZR, MVT::i32);
|
|
break;
|
|
}
|
|
|
|
case 'I':
|
|
case 'J':
|
|
case 'K':
|
|
case 'L':
|
|
case 'M':
|
|
case 'N':
|
|
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op);
|
|
if (!C)
|
|
return;
|
|
|
|
// Grab the value and do some validation.
|
|
uint64_t CVal = C->getZExtValue();
|
|
switch (ConstraintLetter) {
|
|
// The I constraint applies only to simple ADD or SUB immediate operands:
|
|
// i.e. 0 to 4095 with optional shift by 12
|
|
// The J constraint applies only to ADD or SUB immediates that would be
|
|
// valid when negated, i.e. if [an add pattern] were to be output as a SUB
|
|
// instruction [or vice versa], in other words -1 to -4095 with optional
|
|
// left shift by 12.
|
|
case 'I':
|
|
if (isUInt<12>(CVal) || isShiftedUInt<12, 12>(CVal))
|
|
break;
|
|
return;
|
|
case 'J': {
|
|
uint64_t NVal = -C->getSExtValue();
|
|
if (isUInt<12>(NVal) || isShiftedUInt<12, 12>(NVal))
|
|
break;
|
|
return;
|
|
}
|
|
// The K and L constraints apply *only* to logical immediates, including
|
|
// what used to be the MOVI alias for ORR (though the MOVI alias has now
|
|
// been removed and MOV should be used). So these constraints have to
|
|
// distinguish between bit patterns that are valid 32-bit or 64-bit
|
|
// "bitmask immediates": for example 0xaaaaaaaa is a valid bimm32 (K), but
|
|
// not a valid bimm64 (L) where 0xaaaaaaaaaaaaaaaa would be valid, and vice
|
|
// versa.
|
|
case 'K':
|
|
if (ARM64_AM::isLogicalImmediate(CVal, 32))
|
|
break;
|
|
return;
|
|
case 'L':
|
|
if (ARM64_AM::isLogicalImmediate(CVal, 64))
|
|
break;
|
|
return;
|
|
// The M and N constraints are a superset of K and L respectively, for use
|
|
// with the MOV (immediate) alias. As well as the logical immediates they
|
|
// also match 32 or 64-bit immediates that can be loaded either using a
|
|
// *single* MOVZ or MOVN , such as 32-bit 0x12340000, 0x00001234, 0xffffedca
|
|
// (M) or 64-bit 0x1234000000000000 (N) etc.
|
|
// As a note some of this code is liberally stolen from the asm parser.
|
|
case 'M': {
|
|
if (!isUInt<32>(CVal))
|
|
return;
|
|
if (ARM64_AM::isLogicalImmediate(CVal, 32))
|
|
break;
|
|
if ((CVal & 0xFFFF) == CVal)
|
|
break;
|
|
if ((CVal & 0xFFFF0000ULL) == CVal)
|
|
break;
|
|
uint64_t NCVal = ~(uint32_t)CVal;
|
|
if ((NCVal & 0xFFFFULL) == NCVal)
|
|
break;
|
|
if ((NCVal & 0xFFFF0000ULL) == NCVal)
|
|
break;
|
|
return;
|
|
}
|
|
case 'N': {
|
|
if (ARM64_AM::isLogicalImmediate(CVal, 64))
|
|
break;
|
|
if ((CVal & 0xFFFFULL) == CVal)
|
|
break;
|
|
if ((CVal & 0xFFFF0000ULL) == CVal)
|
|
break;
|
|
if ((CVal & 0xFFFF00000000ULL) == CVal)
|
|
break;
|
|
if ((CVal & 0xFFFF000000000000ULL) == CVal)
|
|
break;
|
|
uint64_t NCVal = ~CVal;
|
|
if ((NCVal & 0xFFFFULL) == NCVal)
|
|
break;
|
|
if ((NCVal & 0xFFFF0000ULL) == NCVal)
|
|
break;
|
|
if ((NCVal & 0xFFFF00000000ULL) == NCVal)
|
|
break;
|
|
if ((NCVal & 0xFFFF000000000000ULL) == NCVal)
|
|
break;
|
|
return;
|
|
}
|
|
default:
|
|
return;
|
|
}
|
|
|
|
// All assembler immediates are 64-bit integers.
|
|
Result = DAG.getTargetConstant(CVal, MVT::i64);
|
|
break;
|
|
}
|
|
|
|
if (Result.getNode()) {
|
|
Ops.push_back(Result);
|
|
return;
|
|
}
|
|
|
|
return TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// ARM64 Advanced SIMD Support
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
/// WidenVector - Given a value in the V64 register class, produce the
|
|
/// equivalent value in the V128 register class.
|
|
static SDValue WidenVector(SDValue V64Reg, SelectionDAG &DAG) {
|
|
EVT VT = V64Reg.getValueType();
|
|
unsigned NarrowSize = VT.getVectorNumElements();
|
|
MVT EltTy = VT.getVectorElementType().getSimpleVT();
|
|
MVT WideTy = MVT::getVectorVT(EltTy, 2 * NarrowSize);
|
|
SDLoc DL(V64Reg);
|
|
|
|
return DAG.getNode(ISD::INSERT_SUBVECTOR, DL, WideTy, DAG.getUNDEF(WideTy),
|
|
V64Reg, DAG.getConstant(0, MVT::i32));
|
|
}
|
|
|
|
/// getExtFactor - Determine the adjustment factor for the position when
|
|
/// generating an "extract from vector registers" instruction.
|
|
static unsigned getExtFactor(SDValue &V) {
|
|
EVT EltType = V.getValueType().getVectorElementType();
|
|
return EltType.getSizeInBits() / 8;
|
|
}
|
|
|
|
/// NarrowVector - Given a value in the V128 register class, produce the
|
|
/// equivalent value in the V64 register class.
|
|
static SDValue NarrowVector(SDValue V128Reg, SelectionDAG &DAG) {
|
|
EVT VT = V128Reg.getValueType();
|
|
unsigned WideSize = VT.getVectorNumElements();
|
|
MVT EltTy = VT.getVectorElementType().getSimpleVT();
|
|
MVT NarrowTy = MVT::getVectorVT(EltTy, WideSize / 2);
|
|
SDLoc DL(V128Reg);
|
|
|
|
return DAG.getTargetExtractSubreg(ARM64::dsub, DL, NarrowTy, V128Reg);
|
|
}
|
|
|
|
// Gather data to see if the operation can be modelled as a
|
|
// shuffle in combination with VEXTs.
|
|
SDValue ARM64TargetLowering::ReconstructShuffle(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
SDLoc dl(Op);
|
|
EVT VT = Op.getValueType();
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
|
|
SmallVector<SDValue, 2> SourceVecs;
|
|
SmallVector<unsigned, 2> MinElts;
|
|
SmallVector<unsigned, 2> MaxElts;
|
|
|
|
for (unsigned i = 0; i < NumElts; ++i) {
|
|
SDValue V = Op.getOperand(i);
|
|
if (V.getOpcode() == ISD::UNDEF)
|
|
continue;
|
|
else if (V.getOpcode() != ISD::EXTRACT_VECTOR_ELT) {
|
|
// A shuffle can only come from building a vector from various
|
|
// elements of other vectors.
|
|
return SDValue();
|
|
}
|
|
|
|
// Record this extraction against the appropriate vector if possible...
|
|
SDValue SourceVec = V.getOperand(0);
|
|
unsigned EltNo = cast<ConstantSDNode>(V.getOperand(1))->getZExtValue();
|
|
bool FoundSource = false;
|
|
for (unsigned j = 0; j < SourceVecs.size(); ++j) {
|
|
if (SourceVecs[j] == SourceVec) {
|
|
if (MinElts[j] > EltNo)
|
|
MinElts[j] = EltNo;
|
|
if (MaxElts[j] < EltNo)
|
|
MaxElts[j] = EltNo;
|
|
FoundSource = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Or record a new source if not...
|
|
if (!FoundSource) {
|
|
SourceVecs.push_back(SourceVec);
|
|
MinElts.push_back(EltNo);
|
|
MaxElts.push_back(EltNo);
|
|
}
|
|
}
|
|
|
|
// Currently only do something sane when at most two source vectors
|
|
// involved.
|
|
if (SourceVecs.size() > 2)
|
|
return SDValue();
|
|
|
|
SDValue ShuffleSrcs[2] = { DAG.getUNDEF(VT), DAG.getUNDEF(VT) };
|
|
int VEXTOffsets[2] = { 0, 0 };
|
|
|
|
// This loop extracts the usage patterns of the source vectors
|
|
// and prepares appropriate SDValues for a shuffle if possible.
|
|
for (unsigned i = 0; i < SourceVecs.size(); ++i) {
|
|
if (SourceVecs[i].getValueType() == VT) {
|
|
// No VEXT necessary
|
|
ShuffleSrcs[i] = SourceVecs[i];
|
|
VEXTOffsets[i] = 0;
|
|
continue;
|
|
} else if (SourceVecs[i].getValueType().getVectorNumElements() < NumElts) {
|
|
// We can pad out the smaller vector for free, so if it's part of a
|
|
// shuffle...
|
|
ShuffleSrcs[i] = DAG.getNode(ISD::CONCAT_VECTORS, dl, VT, SourceVecs[i],
|
|
DAG.getUNDEF(SourceVecs[i].getValueType()));
|
|
continue;
|
|
}
|
|
|
|
// Don't attempt to extract subvectors from BUILD_VECTOR sources
|
|
// that expand or trunc the original value.
|
|
// TODO: We can try to bitcast and ANY_EXTEND the result but
|
|
// we need to consider the cost of vector ANY_EXTEND, and the
|
|
// legality of all the types.
|
|
if (SourceVecs[i].getValueType().getVectorElementType() !=
|
|
VT.getVectorElementType())
|
|
return SDValue();
|
|
|
|
// Since only 64-bit and 128-bit vectors are legal on ARM and
|
|
// we've eliminated the other cases...
|
|
assert(SourceVecs[i].getValueType().getVectorNumElements() == 2 * NumElts &&
|
|
"unexpected vector sizes in ReconstructShuffle");
|
|
|
|
if (MaxElts[i] - MinElts[i] >= NumElts) {
|
|
// Span too large for a VEXT to cope
|
|
return SDValue();
|
|
}
|
|
|
|
if (MinElts[i] >= NumElts) {
|
|
// The extraction can just take the second half
|
|
VEXTOffsets[i] = NumElts;
|
|
ShuffleSrcs[i] =
|
|
DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, SourceVecs[i],
|
|
DAG.getIntPtrConstant(NumElts));
|
|
} else if (MaxElts[i] < NumElts) {
|
|
// The extraction can just take the first half
|
|
VEXTOffsets[i] = 0;
|
|
ShuffleSrcs[i] = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT,
|
|
SourceVecs[i], DAG.getIntPtrConstant(0));
|
|
} else {
|
|
// An actual VEXT is needed
|
|
VEXTOffsets[i] = MinElts[i];
|
|
SDValue VEXTSrc1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT,
|
|
SourceVecs[i], DAG.getIntPtrConstant(0));
|
|
SDValue VEXTSrc2 =
|
|
DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, SourceVecs[i],
|
|
DAG.getIntPtrConstant(NumElts));
|
|
unsigned Imm = VEXTOffsets[i] * getExtFactor(VEXTSrc1);
|
|
ShuffleSrcs[i] = DAG.getNode(ARM64ISD::EXT, dl, VT, VEXTSrc1, VEXTSrc2,
|
|
DAG.getConstant(Imm, MVT::i32));
|
|
}
|
|
}
|
|
|
|
SmallVector<int, 8> Mask;
|
|
|
|
for (unsigned i = 0; i < NumElts; ++i) {
|
|
SDValue Entry = Op.getOperand(i);
|
|
if (Entry.getOpcode() == ISD::UNDEF) {
|
|
Mask.push_back(-1);
|
|
continue;
|
|
}
|
|
|
|
SDValue ExtractVec = Entry.getOperand(0);
|
|
int ExtractElt =
|
|
cast<ConstantSDNode>(Op.getOperand(i).getOperand(1))->getSExtValue();
|
|
if (ExtractVec == SourceVecs[0]) {
|
|
Mask.push_back(ExtractElt - VEXTOffsets[0]);
|
|
} else {
|
|
Mask.push_back(ExtractElt + NumElts - VEXTOffsets[1]);
|
|
}
|
|
}
|
|
|
|
// Final check before we try to produce nonsense...
|
|
if (isShuffleMaskLegal(Mask, VT))
|
|
return DAG.getVectorShuffle(VT, dl, ShuffleSrcs[0], ShuffleSrcs[1],
|
|
&Mask[0]);
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
// check if an EXT instruction can handle the shuffle mask when the
|
|
// vector sources of the shuffle are the same.
|
|
static bool isSingletonEXTMask(ArrayRef<int> M, EVT VT, unsigned &Imm) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
|
|
// Assume that the first shuffle index is not UNDEF. Fail if it is.
|
|
if (M[0] < 0)
|
|
return false;
|
|
|
|
Imm = M[0];
|
|
|
|
// If this is a VEXT shuffle, the immediate value is the index of the first
|
|
// element. The other shuffle indices must be the successive elements after
|
|
// the first one.
|
|
unsigned ExpectedElt = Imm;
|
|
for (unsigned i = 1; i < NumElts; ++i) {
|
|
// Increment the expected index. If it wraps around, just follow it
|
|
// back to index zero and keep going.
|
|
++ExpectedElt;
|
|
if (ExpectedElt == NumElts)
|
|
ExpectedElt = 0;
|
|
|
|
if (M[i] < 0)
|
|
continue; // ignore UNDEF indices
|
|
if (ExpectedElt != static_cast<unsigned>(M[i]))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// check if an EXT instruction can handle the shuffle mask when the
|
|
// vector sources of the shuffle are different.
|
|
static bool isEXTMask(ArrayRef<int> M, EVT VT, bool &ReverseEXT,
|
|
unsigned &Imm) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
ReverseEXT = false;
|
|
|
|
// Look for the first non-undef choice and count backwards from
|
|
// that. E.g. <-1, -1, 3, ...> means that an EXT must start at 3 - 2 = 1. This
|
|
// guarantees that at least one index is correct.
|
|
const int *FirstRealElt =
|
|
std::find_if(M.begin(), M.end(), [](int Elt) { return Elt >= 0; });
|
|
assert(FirstRealElt != M.end() && "Completely UNDEF shuffle? Why bother?");
|
|
Imm = *FirstRealElt - (FirstRealElt - M.begin());
|
|
|
|
// If this is a VEXT shuffle, the immediate value is the index of the first
|
|
// element. The other shuffle indices must be the successive elements after
|
|
// the first one.
|
|
unsigned ExpectedElt = Imm;
|
|
for (unsigned i = 1; i < NumElts; ++i) {
|
|
// Increment the expected index. If it wraps around, it may still be
|
|
// a VEXT but the source vectors must be swapped.
|
|
ExpectedElt += 1;
|
|
if (ExpectedElt == NumElts * 2) {
|
|
ExpectedElt = 0;
|
|
ReverseEXT = true;
|
|
}
|
|
|
|
if (M[i] < 0)
|
|
continue; // ignore UNDEF indices
|
|
if (ExpectedElt != static_cast<unsigned>(M[i]))
|
|
return false;
|
|
}
|
|
|
|
// Adjust the index value if the source operands will be swapped.
|
|
if (ReverseEXT)
|
|
Imm -= NumElts;
|
|
|
|
return true;
|
|
}
|
|
|
|
/// isREVMask - Check if a vector shuffle corresponds to a REV
|
|
/// instruction with the specified blocksize. (The order of the elements
|
|
/// within each block of the vector is reversed.)
|
|
static bool isREVMask(ArrayRef<int> M, EVT VT, unsigned BlockSize) {
|
|
assert((BlockSize == 16 || BlockSize == 32 || BlockSize == 64) &&
|
|
"Only possible block sizes for REV are: 16, 32, 64");
|
|
|
|
unsigned EltSz = VT.getVectorElementType().getSizeInBits();
|
|
if (EltSz == 64)
|
|
return false;
|
|
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
unsigned BlockElts = M[0] + 1;
|
|
// If the first shuffle index is UNDEF, be optimistic.
|
|
if (M[0] < 0)
|
|
BlockElts = BlockSize / EltSz;
|
|
|
|
if (BlockSize <= EltSz || BlockSize != BlockElts * EltSz)
|
|
return false;
|
|
|
|
for (unsigned i = 0; i < NumElts; ++i) {
|
|
if (M[i] < 0)
|
|
continue; // ignore UNDEF indices
|
|
if ((unsigned)M[i] != (i - i % BlockElts) + (BlockElts - 1 - i % BlockElts))
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool isZIPMask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
WhichResult = (M[0] == 0 ? 0 : 1);
|
|
unsigned Idx = WhichResult * NumElts / 2;
|
|
for (unsigned i = 0; i != NumElts; i += 2) {
|
|
if ((M[i] >= 0 && (unsigned)M[i] != Idx) ||
|
|
(M[i + 1] >= 0 && (unsigned)M[i + 1] != Idx + NumElts))
|
|
return false;
|
|
Idx += 1;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool isUZPMask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
WhichResult = (M[0] == 0 ? 0 : 1);
|
|
for (unsigned i = 0; i != NumElts; ++i) {
|
|
if (M[i] < 0)
|
|
continue; // ignore UNDEF indices
|
|
if ((unsigned)M[i] != 2 * i + WhichResult)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool isTRNMask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
WhichResult = (M[0] == 0 ? 0 : 1);
|
|
for (unsigned i = 0; i < NumElts; i += 2) {
|
|
if ((M[i] >= 0 && (unsigned)M[i] != i + WhichResult) ||
|
|
(M[i + 1] >= 0 && (unsigned)M[i + 1] != i + NumElts + WhichResult))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
/// isZIP_v_undef_Mask - Special case of isZIPMask for canonical form of
|
|
/// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
|
|
/// Mask is e.g., <0, 0, 1, 1> instead of <0, 4, 1, 5>.
|
|
static bool isZIP_v_undef_Mask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
WhichResult = (M[0] == 0 ? 0 : 1);
|
|
unsigned Idx = WhichResult * NumElts / 2;
|
|
for (unsigned i = 0; i != NumElts; i += 2) {
|
|
if ((M[i] >= 0 && (unsigned)M[i] != Idx) ||
|
|
(M[i + 1] >= 0 && (unsigned)M[i + 1] != Idx))
|
|
return false;
|
|
Idx += 1;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// isUZP_v_undef_Mask - Special case of isUZPMask for canonical form of
|
|
/// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
|
|
/// Mask is e.g., <0, 2, 0, 2> instead of <0, 2, 4, 6>,
|
|
static bool isUZP_v_undef_Mask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
|
|
unsigned Half = VT.getVectorNumElements() / 2;
|
|
WhichResult = (M[0] == 0 ? 0 : 1);
|
|
for (unsigned j = 0; j != 2; ++j) {
|
|
unsigned Idx = WhichResult;
|
|
for (unsigned i = 0; i != Half; ++i) {
|
|
int MIdx = M[i + j * Half];
|
|
if (MIdx >= 0 && (unsigned)MIdx != Idx)
|
|
return false;
|
|
Idx += 2;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/// isTRN_v_undef_Mask - Special case of isTRNMask for canonical form of
|
|
/// "vector_shuffle v, v", i.e., "vector_shuffle v, undef".
|
|
/// Mask is e.g., <0, 0, 2, 2> instead of <0, 4, 2, 6>.
|
|
static bool isTRN_v_undef_Mask(ArrayRef<int> M, EVT VT, unsigned &WhichResult) {
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
WhichResult = (M[0] == 0 ? 0 : 1);
|
|
for (unsigned i = 0; i < NumElts; i += 2) {
|
|
if ((M[i] >= 0 && (unsigned)M[i] != i + WhichResult) ||
|
|
(M[i + 1] >= 0 && (unsigned)M[i + 1] != i + WhichResult))
|
|
return false;
|
|
}
|
|
return true;
|
|
}
|
|
|
|
static bool isINSMask(ArrayRef<int> M, int NumInputElements,
|
|
bool &DstIsLeft, int &Anomaly) {
|
|
if (M.size() != static_cast<size_t>(NumInputElements))
|
|
return false;
|
|
|
|
int NumLHSMatch = 0, NumRHSMatch = 0;
|
|
int LastLHSMismatch = -1, LastRHSMismatch = -1;
|
|
|
|
for (int i = 0; i < NumInputElements; ++i) {
|
|
if (M[i] == -1) {
|
|
++NumLHSMatch;
|
|
++NumRHSMatch;
|
|
continue;
|
|
}
|
|
|
|
if (M[i] == i)
|
|
++NumLHSMatch;
|
|
else
|
|
LastLHSMismatch = i;
|
|
|
|
if (M[i] == i + NumInputElements)
|
|
++NumRHSMatch;
|
|
else
|
|
LastRHSMismatch = i;
|
|
}
|
|
|
|
if (NumLHSMatch == NumInputElements - 1) {
|
|
DstIsLeft = true;
|
|
Anomaly = LastLHSMismatch;
|
|
return true;
|
|
} else if (NumRHSMatch == NumInputElements - 1) {
|
|
DstIsLeft = false;
|
|
Anomaly = LastRHSMismatch;
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static bool isConcatMask(ArrayRef<int> Mask, EVT VT, bool SplitLHS) {
|
|
if (VT.getSizeInBits() != 128)
|
|
return false;
|
|
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
|
|
for (int I = 0, E = NumElts / 2; I != E; I++) {
|
|
if (Mask[I] != I)
|
|
return false;
|
|
}
|
|
|
|
int Offset = NumElts / 2;
|
|
for (int I = NumElts / 2, E = NumElts; I != E; I++) {
|
|
if (Mask[I] != I + SplitLHS * Offset)
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static SDValue tryFormConcatFromShuffle(SDValue Op, SelectionDAG &DAG) {
|
|
SDLoc DL(Op);
|
|
EVT VT = Op.getValueType();
|
|
SDValue V0 = Op.getOperand(0);
|
|
SDValue V1 = Op.getOperand(1);
|
|
ArrayRef<int> Mask = cast<ShuffleVectorSDNode>(Op)->getMask();
|
|
|
|
if (VT.getVectorElementType() != V0.getValueType().getVectorElementType() ||
|
|
VT.getVectorElementType() != V1.getValueType().getVectorElementType())
|
|
return SDValue();
|
|
|
|
bool SplitV0 = V0.getValueType().getSizeInBits() == 128;
|
|
|
|
if (!isConcatMask(Mask, VT, SplitV0))
|
|
return SDValue();
|
|
|
|
EVT CastVT = EVT::getVectorVT(*DAG.getContext(), VT.getVectorElementType(),
|
|
VT.getVectorNumElements() / 2);
|
|
if (SplitV0) {
|
|
V0 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, CastVT, V0,
|
|
DAG.getConstant(0, MVT::i64));
|
|
}
|
|
if (V1.getValueType().getSizeInBits() == 128) {
|
|
V1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, CastVT, V1,
|
|
DAG.getConstant(0, MVT::i64));
|
|
}
|
|
return DAG.getNode(ISD::CONCAT_VECTORS, DL, VT, V0, V1);
|
|
}
|
|
|
|
/// GeneratePerfectShuffle - Given an entry in the perfect-shuffle table, emit
|
|
/// the specified operations to build the shuffle.
|
|
static SDValue GeneratePerfectShuffle(unsigned PFEntry, SDValue LHS,
|
|
SDValue RHS, SelectionDAG &DAG,
|
|
SDLoc dl) {
|
|
unsigned OpNum = (PFEntry >> 26) & 0x0F;
|
|
unsigned LHSID = (PFEntry >> 13) & ((1 << 13) - 1);
|
|
unsigned RHSID = (PFEntry >> 0) & ((1 << 13) - 1);
|
|
|
|
enum {
|
|
OP_COPY = 0, // Copy, used for things like <u,u,u,3> to say it is <0,1,2,3>
|
|
OP_VREV,
|
|
OP_VDUP0,
|
|
OP_VDUP1,
|
|
OP_VDUP2,
|
|
OP_VDUP3,
|
|
OP_VEXT1,
|
|
OP_VEXT2,
|
|
OP_VEXT3,
|
|
OP_VUZPL, // VUZP, left result
|
|
OP_VUZPR, // VUZP, right result
|
|
OP_VZIPL, // VZIP, left result
|
|
OP_VZIPR, // VZIP, right result
|
|
OP_VTRNL, // VTRN, left result
|
|
OP_VTRNR // VTRN, right result
|
|
};
|
|
|
|
if (OpNum == OP_COPY) {
|
|
if (LHSID == (1 * 9 + 2) * 9 + 3)
|
|
return LHS;
|
|
assert(LHSID == ((4 * 9 + 5) * 9 + 6) * 9 + 7 && "Illegal OP_COPY!");
|
|
return RHS;
|
|
}
|
|
|
|
SDValue OpLHS, OpRHS;
|
|
OpLHS = GeneratePerfectShuffle(PerfectShuffleTable[LHSID], LHS, RHS, DAG, dl);
|
|
OpRHS = GeneratePerfectShuffle(PerfectShuffleTable[RHSID], LHS, RHS, DAG, dl);
|
|
EVT VT = OpLHS.getValueType();
|
|
|
|
switch (OpNum) {
|
|
default:
|
|
llvm_unreachable("Unknown shuffle opcode!");
|
|
case OP_VREV:
|
|
// VREV divides the vector in half and swaps within the half.
|
|
if (VT.getVectorElementType() == MVT::i32 ||
|
|
VT.getVectorElementType() == MVT::f32)
|
|
return DAG.getNode(ARM64ISD::REV64, dl, VT, OpLHS);
|
|
// vrev <4 x i16> -> REV32
|
|
if (VT.getVectorElementType() == MVT::i16)
|
|
return DAG.getNode(ARM64ISD::REV32, dl, VT, OpLHS);
|
|
// vrev <4 x i8> -> REV16
|
|
assert(VT.getVectorElementType() == MVT::i8);
|
|
return DAG.getNode(ARM64ISD::REV16, dl, VT, OpLHS);
|
|
case OP_VDUP0:
|
|
case OP_VDUP1:
|
|
case OP_VDUP2:
|
|
case OP_VDUP3: {
|
|
EVT EltTy = VT.getVectorElementType();
|
|
unsigned Opcode;
|
|
if (EltTy == MVT::i8)
|
|
Opcode = ARM64ISD::DUPLANE8;
|
|
else if (EltTy == MVT::i16)
|
|
Opcode = ARM64ISD::DUPLANE16;
|
|
else if (EltTy == MVT::i32 || EltTy == MVT::f32)
|
|
Opcode = ARM64ISD::DUPLANE32;
|
|
else if (EltTy == MVT::i64 || EltTy == MVT::f64)
|
|
Opcode = ARM64ISD::DUPLANE64;
|
|
else
|
|
llvm_unreachable("Invalid vector element type?");
|
|
|
|
if (VT.getSizeInBits() == 64)
|
|
OpLHS = WidenVector(OpLHS, DAG);
|
|
SDValue Lane = DAG.getConstant(OpNum - OP_VDUP0, MVT::i64);
|
|
return DAG.getNode(Opcode, dl, VT, OpLHS, Lane);
|
|
}
|
|
case OP_VEXT1:
|
|
case OP_VEXT2:
|
|
case OP_VEXT3: {
|
|
unsigned Imm = (OpNum - OP_VEXT1 + 1) * getExtFactor(OpLHS);
|
|
return DAG.getNode(ARM64ISD::EXT, dl, VT, OpLHS, OpRHS,
|
|
DAG.getConstant(Imm, MVT::i32));
|
|
}
|
|
case OP_VUZPL:
|
|
return DAG.getNode(ARM64ISD::UZP1, dl, DAG.getVTList(VT, VT), OpLHS, OpRHS);
|
|
case OP_VUZPR:
|
|
return DAG.getNode(ARM64ISD::UZP2, dl, DAG.getVTList(VT, VT), OpLHS, OpRHS);
|
|
case OP_VZIPL:
|
|
return DAG.getNode(ARM64ISD::ZIP1, dl, DAG.getVTList(VT, VT), OpLHS, OpRHS);
|
|
case OP_VZIPR:
|
|
return DAG.getNode(ARM64ISD::ZIP2, dl, DAG.getVTList(VT, VT), OpLHS, OpRHS);
|
|
case OP_VTRNL:
|
|
return DAG.getNode(ARM64ISD::TRN1, dl, DAG.getVTList(VT, VT), OpLHS, OpRHS);
|
|
case OP_VTRNR:
|
|
return DAG.getNode(ARM64ISD::TRN2, dl, DAG.getVTList(VT, VT), OpLHS, OpRHS);
|
|
}
|
|
}
|
|
|
|
static SDValue GenerateTBL(SDValue Op, ArrayRef<int> ShuffleMask,
|
|
SelectionDAG &DAG) {
|
|
// Check to see if we can use the TBL instruction.
|
|
SDValue V1 = Op.getOperand(0);
|
|
SDValue V2 = Op.getOperand(1);
|
|
SDLoc DL(Op);
|
|
|
|
EVT EltVT = Op.getValueType().getVectorElementType();
|
|
unsigned BytesPerElt = EltVT.getSizeInBits() / 8;
|
|
|
|
SmallVector<SDValue, 8> TBLMask;
|
|
for (int Val : ShuffleMask) {
|
|
for (unsigned Byte = 0; Byte < BytesPerElt; ++Byte) {
|
|
unsigned Offset = Byte + Val * BytesPerElt;
|
|
TBLMask.push_back(DAG.getConstant(Offset, MVT::i32));
|
|
}
|
|
}
|
|
|
|
MVT IndexVT = MVT::v8i8;
|
|
unsigned IndexLen = 8;
|
|
if (Op.getValueType().getSizeInBits() == 128) {
|
|
IndexVT = MVT::v16i8;
|
|
IndexLen = 16;
|
|
}
|
|
|
|
SDValue V1Cst = DAG.getNode(ISD::BITCAST, DL, IndexVT, V1);
|
|
SDValue V2Cst = DAG.getNode(ISD::BITCAST, DL, IndexVT, V2);
|
|
|
|
SDValue Shuffle;
|
|
if (V2.getNode()->getOpcode() == ISD::UNDEF) {
|
|
if (IndexLen == 8)
|
|
V1Cst = DAG.getNode(ISD::CONCAT_VECTORS, DL, MVT::v16i8, V1Cst, V1Cst);
|
|
Shuffle = DAG.getNode(
|
|
ISD::INTRINSIC_WO_CHAIN, DL, IndexVT,
|
|
DAG.getConstant(Intrinsic::arm64_neon_tbl1, MVT::i32), V1Cst,
|
|
DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT, &TBLMask[0], IndexLen));
|
|
} else {
|
|
if (IndexLen == 8) {
|
|
V1Cst = DAG.getNode(ISD::CONCAT_VECTORS, DL, MVT::v16i8, V1Cst, V2Cst);
|
|
Shuffle = DAG.getNode(
|
|
ISD::INTRINSIC_WO_CHAIN, DL, IndexVT,
|
|
DAG.getConstant(Intrinsic::arm64_neon_tbl1, MVT::i32), V1Cst,
|
|
DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT, &TBLMask[0], IndexLen));
|
|
} else {
|
|
// FIXME: We cannot, for the moment, emit a TBL2 instruction because we
|
|
// cannot currently represent the register constraints on the input
|
|
// table registers.
|
|
// Shuffle = DAG.getNode(ARM64ISD::TBL2, DL, IndexVT, V1Cst, V2Cst,
|
|
// DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT,
|
|
// &TBLMask[0], IndexLen));
|
|
Shuffle = DAG.getNode(
|
|
ISD::INTRINSIC_WO_CHAIN, DL, IndexVT,
|
|
DAG.getConstant(Intrinsic::arm64_neon_tbl2, MVT::i32), V1Cst, V2Cst,
|
|
DAG.getNode(ISD::BUILD_VECTOR, DL, IndexVT, &TBLMask[0], IndexLen));
|
|
}
|
|
}
|
|
return DAG.getNode(ISD::BITCAST, DL, Op.getValueType(), Shuffle);
|
|
}
|
|
|
|
static unsigned getDUPLANEOp(EVT EltType) {
|
|
if (EltType == MVT::i8)
|
|
return ARM64ISD::DUPLANE8;
|
|
if (EltType == MVT::i16)
|
|
return ARM64ISD::DUPLANE16;
|
|
if (EltType == MVT::i32 || EltType == MVT::f32)
|
|
return ARM64ISD::DUPLANE32;
|
|
if (EltType == MVT::i64 || EltType == MVT::f64)
|
|
return ARM64ISD::DUPLANE64;
|
|
|
|
llvm_unreachable("Invalid vector element type?");
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVECTOR_SHUFFLE(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
SDLoc dl(Op);
|
|
EVT VT = Op.getValueType();
|
|
|
|
ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(Op.getNode());
|
|
|
|
// Convert shuffles that are directly supported on NEON to target-specific
|
|
// DAG nodes, instead of keeping them as shuffles and matching them again
|
|
// during code selection. This is more efficient and avoids the possibility
|
|
// of inconsistencies between legalization and selection.
|
|
ArrayRef<int> ShuffleMask = SVN->getMask();
|
|
|
|
SDValue V1 = Op.getOperand(0);
|
|
SDValue V2 = Op.getOperand(1);
|
|
|
|
if (ShuffleVectorSDNode::isSplatMask(&ShuffleMask[0],
|
|
V1.getValueType().getSimpleVT())) {
|
|
int Lane = SVN->getSplatIndex();
|
|
// If this is undef splat, generate it via "just" vdup, if possible.
|
|
if (Lane == -1)
|
|
Lane = 0;
|
|
|
|
if (Lane == 0 && V1.getOpcode() == ISD::SCALAR_TO_VECTOR)
|
|
return DAG.getNode(ARM64ISD::DUP, dl, V1.getValueType(),
|
|
V1.getOperand(0));
|
|
// Test if V1 is a BUILD_VECTOR and the lane being referenced is a non-
|
|
// constant. If so, we can just reference the lane's definition directly.
|
|
if (V1.getOpcode() == ISD::BUILD_VECTOR &&
|
|
!isa<ConstantSDNode>(V1.getOperand(Lane)))
|
|
return DAG.getNode(ARM64ISD::DUP, dl, VT, V1.getOperand(Lane));
|
|
|
|
// Otherwise, duplicate from the lane of the input vector.
|
|
unsigned Opcode = getDUPLANEOp(V1.getValueType().getVectorElementType());
|
|
|
|
// SelectionDAGBuilder may have "helpfully" already extracted or conatenated
|
|
// to make a vector of the same size as this SHUFFLE. We can ignore the
|
|
// extract entirely, and canonicalise the concat using WidenVector.
|
|
if (V1.getOpcode() == ISD::EXTRACT_SUBVECTOR) {
|
|
Lane += cast<ConstantSDNode>(V1.getOperand(1))->getZExtValue();
|
|
V1 = V1.getOperand(0);
|
|
} else if (V1.getOpcode() == ISD::CONCAT_VECTORS) {
|
|
unsigned Idx = Lane >= (int)VT.getVectorNumElements() / 2;
|
|
Lane -= Idx * VT.getVectorNumElements() / 2;
|
|
V1 = WidenVector(V1.getOperand(Idx), DAG);
|
|
} else if (VT.getSizeInBits() == 64)
|
|
V1 = WidenVector(V1, DAG);
|
|
|
|
return DAG.getNode(Opcode, dl, VT, V1, DAG.getConstant(Lane, MVT::i64));
|
|
}
|
|
|
|
if (isREVMask(ShuffleMask, VT, 64))
|
|
return DAG.getNode(ARM64ISD::REV64, dl, V1.getValueType(), V1, V2);
|
|
if (isREVMask(ShuffleMask, VT, 32))
|
|
return DAG.getNode(ARM64ISD::REV32, dl, V1.getValueType(), V1, V2);
|
|
if (isREVMask(ShuffleMask, VT, 16))
|
|
return DAG.getNode(ARM64ISD::REV16, dl, V1.getValueType(), V1, V2);
|
|
|
|
bool ReverseEXT = false;
|
|
unsigned Imm;
|
|
if (isEXTMask(ShuffleMask, VT, ReverseEXT, Imm)) {
|
|
if (ReverseEXT)
|
|
std::swap(V1, V2);
|
|
Imm *= getExtFactor(V1);
|
|
return DAG.getNode(ARM64ISD::EXT, dl, V1.getValueType(), V1, V2,
|
|
DAG.getConstant(Imm, MVT::i32));
|
|
} else if (V2->getOpcode() == ISD::UNDEF &&
|
|
isSingletonEXTMask(ShuffleMask, VT, Imm)) {
|
|
Imm *= getExtFactor(V1);
|
|
return DAG.getNode(ARM64ISD::EXT, dl, V1.getValueType(), V1, V1,
|
|
DAG.getConstant(Imm, MVT::i32));
|
|
}
|
|
|
|
unsigned WhichResult;
|
|
if (isZIPMask(ShuffleMask, VT, WhichResult)) {
|
|
unsigned Opc = (WhichResult == 0) ? ARM64ISD::ZIP1 : ARM64ISD::ZIP2;
|
|
return DAG.getNode(Opc, dl, V1.getValueType(), V1, V2);
|
|
}
|
|
if (isUZPMask(ShuffleMask, VT, WhichResult)) {
|
|
unsigned Opc = (WhichResult == 0) ? ARM64ISD::UZP1 : ARM64ISD::UZP2;
|
|
return DAG.getNode(Opc, dl, V1.getValueType(), V1, V2);
|
|
}
|
|
if (isTRNMask(ShuffleMask, VT, WhichResult)) {
|
|
unsigned Opc = (WhichResult == 0) ? ARM64ISD::TRN1 : ARM64ISD::TRN2;
|
|
return DAG.getNode(Opc, dl, V1.getValueType(), V1, V2);
|
|
}
|
|
|
|
if (isZIP_v_undef_Mask(ShuffleMask, VT, WhichResult)) {
|
|
unsigned Opc = (WhichResult == 0) ? ARM64ISD::ZIP1 : ARM64ISD::ZIP2;
|
|
return DAG.getNode(Opc, dl, V1.getValueType(), V1, V1);
|
|
}
|
|
if (isUZP_v_undef_Mask(ShuffleMask, VT, WhichResult)) {
|
|
unsigned Opc = (WhichResult == 0) ? ARM64ISD::UZP1 : ARM64ISD::UZP2;
|
|
return DAG.getNode(Opc, dl, V1.getValueType(), V1, V1);
|
|
}
|
|
if (isTRN_v_undef_Mask(ShuffleMask, VT, WhichResult)) {
|
|
unsigned Opc = (WhichResult == 0) ? ARM64ISD::TRN1 : ARM64ISD::TRN2;
|
|
return DAG.getNode(Opc, dl, V1.getValueType(), V1, V1);
|
|
}
|
|
|
|
SDValue Concat = tryFormConcatFromShuffle(Op, DAG);
|
|
if (Concat.getNode())
|
|
return Concat;
|
|
|
|
bool DstIsLeft;
|
|
int Anomaly;
|
|
int NumInputElements = V1.getValueType().getVectorNumElements();
|
|
if (isINSMask(ShuffleMask, NumInputElements, DstIsLeft, Anomaly)) {
|
|
SDValue DstVec = DstIsLeft ? V1 : V2;
|
|
SDValue DstLaneV = DAG.getConstant(Anomaly, MVT::i64);
|
|
|
|
SDValue SrcVec = V1;
|
|
int SrcLane = ShuffleMask[Anomaly];
|
|
if (SrcLane >= NumInputElements) {
|
|
SrcVec = V2;
|
|
SrcLane -= VT.getVectorNumElements();
|
|
}
|
|
SDValue SrcLaneV = DAG.getConstant(SrcLane, MVT::i64);
|
|
|
|
EVT ScalarVT = VT.getVectorElementType();
|
|
if (ScalarVT.getSizeInBits() < 32)
|
|
ScalarVT = MVT::i32;
|
|
|
|
return DAG.getNode(
|
|
ISD::INSERT_VECTOR_ELT, dl, VT, DstVec,
|
|
DAG.getNode(ISD::EXTRACT_VECTOR_ELT, dl, ScalarVT, SrcVec, SrcLaneV),
|
|
DstLaneV);
|
|
}
|
|
|
|
// If the shuffle is not directly supported and it has 4 elements, use
|
|
// the PerfectShuffle-generated table to synthesize it from other shuffles.
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
if (NumElts == 4) {
|
|
unsigned PFIndexes[4];
|
|
for (unsigned i = 0; i != 4; ++i) {
|
|
if (ShuffleMask[i] < 0)
|
|
PFIndexes[i] = 8;
|
|
else
|
|
PFIndexes[i] = ShuffleMask[i];
|
|
}
|
|
|
|
// Compute the index in the perfect shuffle table.
|
|
unsigned PFTableIndex = PFIndexes[0] * 9 * 9 * 9 + PFIndexes[1] * 9 * 9 +
|
|
PFIndexes[2] * 9 + PFIndexes[3];
|
|
unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
|
|
unsigned Cost = (PFEntry >> 30);
|
|
|
|
if (Cost <= 4)
|
|
return GeneratePerfectShuffle(PFEntry, V1, V2, DAG, dl);
|
|
}
|
|
|
|
return GenerateTBL(Op, ShuffleMask, DAG);
|
|
}
|
|
|
|
static bool resolveBuildVector(BuildVectorSDNode *BVN, APInt &CnstBits,
|
|
APInt &UndefBits) {
|
|
EVT VT = BVN->getValueType(0);
|
|
APInt SplatBits, SplatUndef;
|
|
unsigned SplatBitSize;
|
|
bool HasAnyUndefs;
|
|
if (BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize, HasAnyUndefs)) {
|
|
unsigned NumSplats = VT.getSizeInBits() / SplatBitSize;
|
|
|
|
for (unsigned i = 0; i < NumSplats; ++i) {
|
|
CnstBits <<= SplatBitSize;
|
|
UndefBits <<= SplatBitSize;
|
|
CnstBits |= SplatBits.zextOrTrunc(VT.getSizeInBits());
|
|
UndefBits |= (SplatBits ^ SplatUndef).zextOrTrunc(VT.getSizeInBits());
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVectorAND(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
BuildVectorSDNode *BVN =
|
|
dyn_cast<BuildVectorSDNode>(Op.getOperand(1).getNode());
|
|
SDValue LHS = Op.getOperand(0);
|
|
SDLoc dl(Op);
|
|
EVT VT = Op.getValueType();
|
|
|
|
if (!BVN)
|
|
return Op;
|
|
|
|
APInt CnstBits(VT.getSizeInBits(), 0);
|
|
APInt UndefBits(VT.getSizeInBits(), 0);
|
|
if (resolveBuildVector(BVN, CnstBits, UndefBits)) {
|
|
// We only have BIC vector immediate instruction, which is and-not.
|
|
CnstBits = ~CnstBits;
|
|
|
|
// We make use of a little bit of goto ickiness in order to avoid having to
|
|
// duplicate the immediate matching logic for the undef toggled case.
|
|
bool SecondTry = false;
|
|
AttemptModImm:
|
|
|
|
if (CnstBits.getHiBits(64) == CnstBits.getLoBits(64)) {
|
|
CnstBits = CnstBits.zextOrTrunc(64);
|
|
uint64_t CnstVal = CnstBits.getZExtValue();
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType1(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType1(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::BICi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType2(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType2(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::BICi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType3(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType3(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::BICi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(16, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType4(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType4(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::BICi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(24, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType5(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType5(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::BICi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType6(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType6(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::BICi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
}
|
|
|
|
if (SecondTry)
|
|
goto FailedModImm;
|
|
SecondTry = true;
|
|
CnstBits = ~UndefBits;
|
|
goto AttemptModImm;
|
|
}
|
|
|
|
// We can always fall back to a non-immediate AND.
|
|
FailedModImm:
|
|
return Op;
|
|
}
|
|
|
|
// Specialized code to quickly find if PotentialBVec is a BuildVector that
|
|
// consists of only the same constant int value, returned in reference arg
|
|
// ConstVal
|
|
static bool isAllConstantBuildVector(const SDValue &PotentialBVec,
|
|
uint64_t &ConstVal) {
|
|
BuildVectorSDNode *Bvec = dyn_cast<BuildVectorSDNode>(PotentialBVec);
|
|
if (!Bvec)
|
|
return false;
|
|
ConstantSDNode *FirstElt = dyn_cast<ConstantSDNode>(Bvec->getOperand(0));
|
|
if (!FirstElt)
|
|
return false;
|
|
EVT VT = Bvec->getValueType(0);
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
for (unsigned i = 1; i < NumElts; ++i)
|
|
if (dyn_cast<ConstantSDNode>(Bvec->getOperand(i)) != FirstElt)
|
|
return false;
|
|
ConstVal = FirstElt->getZExtValue();
|
|
return true;
|
|
}
|
|
|
|
static unsigned getIntrinsicID(const SDNode *N) {
|
|
unsigned Opcode = N->getOpcode();
|
|
switch (Opcode) {
|
|
default:
|
|
return Intrinsic::not_intrinsic;
|
|
case ISD::INTRINSIC_WO_CHAIN: {
|
|
unsigned IID = cast<ConstantSDNode>(N->getOperand(0))->getZExtValue();
|
|
if (IID < Intrinsic::num_intrinsics)
|
|
return IID;
|
|
return Intrinsic::not_intrinsic;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Attempt to form a vector S[LR]I from (or (and X, BvecC1), (lsl Y, C2)),
|
|
// to (SLI X, Y, C2), where X and Y have matching vector types, BvecC1 is a
|
|
// BUILD_VECTORs with constant element C1, C2 is a constant, and C1 == ~C2.
|
|
// Also, logical shift right -> sri, with the same structure.
|
|
static SDValue tryLowerToSLI(SDNode *N, SelectionDAG &DAG) {
|
|
EVT VT = N->getValueType(0);
|
|
|
|
if (!VT.isVector())
|
|
return SDValue();
|
|
|
|
SDLoc DL(N);
|
|
|
|
// Is the first op an AND?
|
|
const SDValue And = N->getOperand(0);
|
|
if (And.getOpcode() != ISD::AND)
|
|
return SDValue();
|
|
|
|
// Is the second op an shl or lshr?
|
|
SDValue Shift = N->getOperand(1);
|
|
// This will have been turned into: ARM64ISD::VSHL vector, #shift
|
|
// or ARM64ISD::VLSHR vector, #shift
|
|
unsigned ShiftOpc = Shift.getOpcode();
|
|
if ((ShiftOpc != ARM64ISD::VSHL && ShiftOpc != ARM64ISD::VLSHR))
|
|
return SDValue();
|
|
bool IsShiftRight = ShiftOpc == ARM64ISD::VLSHR;
|
|
|
|
// Is the shift amount constant?
|
|
ConstantSDNode *C2node = dyn_cast<ConstantSDNode>(Shift.getOperand(1));
|
|
if (!C2node)
|
|
return SDValue();
|
|
|
|
// Is the and mask vector all constant?
|
|
uint64_t C1;
|
|
if (!isAllConstantBuildVector(And.getOperand(1), C1))
|
|
return SDValue();
|
|
|
|
// Is C1 == ~C2, taking into account how much one can shift elements of a
|
|
// particular size?
|
|
uint64_t C2 = C2node->getZExtValue();
|
|
unsigned ElemSizeInBits = VT.getVectorElementType().getSizeInBits();
|
|
if (C2 > ElemSizeInBits)
|
|
return SDValue();
|
|
unsigned ElemMask = (1 << ElemSizeInBits) - 1;
|
|
if ((C1 & ElemMask) != (~C2 & ElemMask))
|
|
return SDValue();
|
|
|
|
SDValue X = And.getOperand(0);
|
|
SDValue Y = Shift.getOperand(0);
|
|
|
|
unsigned Intrin =
|
|
IsShiftRight ? Intrinsic::arm64_neon_vsri : Intrinsic::arm64_neon_vsli;
|
|
SDValue ResultSLI =
|
|
DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
|
|
DAG.getConstant(Intrin, MVT::i32), X, Y, Shift.getOperand(1));
|
|
|
|
DEBUG(dbgs() << "arm64-lower: transformed: \n");
|
|
DEBUG(N->dump(&DAG));
|
|
DEBUG(dbgs() << "into: \n");
|
|
DEBUG(ResultSLI->dump(&DAG));
|
|
|
|
++NumShiftInserts;
|
|
return ResultSLI;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVectorOR(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
// Attempt to form a vector S[LR]I from (or (and X, C1), (lsl Y, C2))
|
|
if (EnableARM64SlrGeneration) {
|
|
SDValue Res = tryLowerToSLI(Op.getNode(), DAG);
|
|
if (Res.getNode())
|
|
return Res;
|
|
}
|
|
|
|
BuildVectorSDNode *BVN =
|
|
dyn_cast<BuildVectorSDNode>(Op.getOperand(0).getNode());
|
|
SDValue LHS = Op.getOperand(1);
|
|
SDLoc dl(Op);
|
|
EVT VT = Op.getValueType();
|
|
|
|
// OR commutes, so try swapping the operands.
|
|
if (!BVN) {
|
|
LHS = Op.getOperand(0);
|
|
BVN = dyn_cast<BuildVectorSDNode>(Op.getOperand(1).getNode());
|
|
}
|
|
if (!BVN)
|
|
return Op;
|
|
|
|
APInt CnstBits(VT.getSizeInBits(), 0);
|
|
APInt UndefBits(VT.getSizeInBits(), 0);
|
|
if (resolveBuildVector(BVN, CnstBits, UndefBits)) {
|
|
// We make use of a little bit of goto ickiness in order to avoid having to
|
|
// duplicate the immediate matching logic for the undef toggled case.
|
|
bool SecondTry = false;
|
|
AttemptModImm:
|
|
|
|
if (CnstBits.getHiBits(64) == CnstBits.getLoBits(64)) {
|
|
CnstBits = CnstBits.zextOrTrunc(64);
|
|
uint64_t CnstVal = CnstBits.getZExtValue();
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType1(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType1(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::ORRi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType2(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType2(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::ORRi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType3(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType3(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::ORRi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(16, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType4(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType4(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::ORRi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(24, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType5(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType5(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::ORRi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType6(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType6(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::ORRi, dl, MovTy, LHS,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
}
|
|
|
|
if (SecondTry)
|
|
goto FailedModImm;
|
|
SecondTry = true;
|
|
CnstBits = UndefBits;
|
|
goto AttemptModImm;
|
|
}
|
|
|
|
// We can always fall back to a non-immediate OR.
|
|
FailedModImm:
|
|
return Op;
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerBUILD_VECTOR(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
BuildVectorSDNode *BVN = cast<BuildVectorSDNode>(Op.getNode());
|
|
SDLoc dl(Op);
|
|
EVT VT = Op.getValueType();
|
|
|
|
APInt CnstBits(VT.getSizeInBits(), 0);
|
|
APInt UndefBits(VT.getSizeInBits(), 0);
|
|
if (resolveBuildVector(BVN, CnstBits, UndefBits)) {
|
|
// We make use of a little bit of goto ickiness in order to avoid having to
|
|
// duplicate the immediate matching logic for the undef toggled case.
|
|
bool SecondTry = false;
|
|
AttemptModImm:
|
|
|
|
if (CnstBits.getHiBits(64) == CnstBits.getLoBits(64)) {
|
|
CnstBits = CnstBits.zextOrTrunc(64);
|
|
uint64_t CnstVal = CnstBits.getZExtValue();
|
|
|
|
// Certain magic vector constants (used to express things like NOT
|
|
// and NEG) are passed through unmodified. This allows codegen patterns
|
|
// for these operations to match. Special-purpose patterns will lower
|
|
// these immediates to MOVIs if it proves necessary.
|
|
if (VT.isInteger() && (CnstVal == 0 || CnstVal == ~0ULL))
|
|
return Op;
|
|
|
|
// The many faces of MOVI...
|
|
if (ARM64_AM::isAdvSIMDModImmType10(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType10(CnstVal);
|
|
if (VT.getSizeInBits() == 128) {
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIedit, dl, MVT::v2i64,
|
|
DAG.getConstant(CnstVal, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
// Support the V64 version via subregister insertion.
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIedit, dl, MVT::f64,
|
|
DAG.getConstant(CnstVal, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType1(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType1(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType2(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType2(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType3(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType3(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(16, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType4(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType4(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(24, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType5(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType5(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType6(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType6(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType7(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType7(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVImsl, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(264, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType8(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType8(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVImsl, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(272, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType9(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType9(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v16i8 : MVT::v8i8;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MOVI, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
// The few faces of FMOV...
|
|
if (ARM64_AM::isAdvSIMDModImmType11(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType11(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4f32 : MVT::v2f32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::FMOV, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType12(CnstVal) &&
|
|
VT.getSizeInBits() == 128) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType12(CnstVal);
|
|
SDValue Mov = DAG.getNode(ARM64ISD::FMOV, dl, MVT::v2f64,
|
|
DAG.getConstant(CnstVal, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
// The many faces of MVNI...
|
|
CnstVal = ~CnstVal;
|
|
if (ARM64_AM::isAdvSIMDModImmType1(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType1(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType2(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType2(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType3(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType3(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(16, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType4(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType4(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(24, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType5(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType5(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(0, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType6(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType6(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v8i16 : MVT::v4i16;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNIshift, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(8, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType7(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType7(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNImsl, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(264, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
|
|
if (ARM64_AM::isAdvSIMDModImmType8(CnstVal)) {
|
|
CnstVal = ARM64_AM::encodeAdvSIMDModImmType8(CnstVal);
|
|
MVT MovTy = (VT.getSizeInBits() == 128) ? MVT::v4i32 : MVT::v2i32;
|
|
SDValue Mov = DAG.getNode(ARM64ISD::MVNImsl, dl, MovTy,
|
|
DAG.getConstant(CnstVal, MVT::i32),
|
|
DAG.getConstant(272, MVT::i32));
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Mov);
|
|
}
|
|
}
|
|
|
|
if (SecondTry)
|
|
goto FailedModImm;
|
|
SecondTry = true;
|
|
CnstBits = UndefBits;
|
|
goto AttemptModImm;
|
|
}
|
|
FailedModImm:
|
|
|
|
// Scan through the operands to find some interesting properties we can
|
|
// exploit:
|
|
// 1) If only one value is used, we can use a DUP, or
|
|
// 2) if only the low element is not undef, we can just insert that, or
|
|
// 3) if only one constant value is used (w/ some non-constant lanes),
|
|
// we can splat the constant value into the whole vector then fill
|
|
// in the non-constant lanes.
|
|
// 4) FIXME: If different constant values are used, but we can intelligently
|
|
// select the values we'll be overwriting for the non-constant
|
|
// lanes such that we can directly materialize the vector
|
|
// some other way (MOVI, e.g.), we can be sneaky.
|
|
unsigned NumElts = VT.getVectorNumElements();
|
|
bool isOnlyLowElement = true;
|
|
bool usesOnlyOneValue = true;
|
|
bool usesOnlyOneConstantValue = true;
|
|
bool isConstant = true;
|
|
unsigned NumConstantLanes = 0;
|
|
SDValue Value;
|
|
SDValue ConstantValue;
|
|
for (unsigned i = 0; i < NumElts; ++i) {
|
|
SDValue V = Op.getOperand(i);
|
|
if (V.getOpcode() == ISD::UNDEF)
|
|
continue;
|
|
if (i > 0)
|
|
isOnlyLowElement = false;
|
|
if (!isa<ConstantFPSDNode>(V) && !isa<ConstantSDNode>(V))
|
|
isConstant = false;
|
|
|
|
if (isa<ConstantSDNode>(V) || isa<ConstantFPSDNode>(V)) {
|
|
++NumConstantLanes;
|
|
if (!ConstantValue.getNode())
|
|
ConstantValue = V;
|
|
else if (ConstantValue != V)
|
|
usesOnlyOneConstantValue = false;
|
|
}
|
|
|
|
if (!Value.getNode())
|
|
Value = V;
|
|
else if (V != Value)
|
|
usesOnlyOneValue = false;
|
|
}
|
|
|
|
if (!Value.getNode())
|
|
return DAG.getUNDEF(VT);
|
|
|
|
if (isOnlyLowElement)
|
|
return DAG.getNode(ISD::SCALAR_TO_VECTOR, dl, VT, Value);
|
|
|
|
// Use DUP for non-constant splats. For f32 constant splats, reduce to
|
|
// i32 and try again.
|
|
if (usesOnlyOneValue) {
|
|
if (!isConstant) {
|
|
if (Value.getOpcode() != ISD::EXTRACT_VECTOR_ELT ||
|
|
Value.getValueType() != VT)
|
|
return DAG.getNode(ARM64ISD::DUP, dl, VT, Value);
|
|
|
|
// This is actually a DUPLANExx operation, which keeps everything vectory.
|
|
|
|
// DUPLANE works on 128-bit vectors, widen it if necessary.
|
|
SDValue Lane = Value.getOperand(1);
|
|
Value = Value.getOperand(0);
|
|
if (Value.getValueType().getSizeInBits() == 64)
|
|
Value = WidenVector(Value, DAG);
|
|
|
|
unsigned Opcode = getDUPLANEOp(VT.getVectorElementType());
|
|
return DAG.getNode(Opcode, dl, VT, Value, Lane);
|
|
}
|
|
|
|
if (VT.getVectorElementType().isFloatingPoint()) {
|
|
SmallVector<SDValue, 8> Ops;
|
|
MVT NewType =
|
|
(VT.getVectorElementType() == MVT::f32) ? MVT::i32 : MVT::i64;
|
|
for (unsigned i = 0; i < NumElts; ++i)
|
|
Ops.push_back(DAG.getNode(ISD::BITCAST, dl, NewType, Op.getOperand(i)));
|
|
EVT VecVT = EVT::getVectorVT(*DAG.getContext(), NewType, NumElts);
|
|
SDValue Val = DAG.getNode(ISD::BUILD_VECTOR, dl, VecVT, &Ops[0], NumElts);
|
|
Val = LowerBUILD_VECTOR(Val, DAG);
|
|
if (Val.getNode())
|
|
return DAG.getNode(ISD::BITCAST, dl, VT, Val);
|
|
}
|
|
}
|
|
|
|
// If there was only one constant value used and for more than one lane,
|
|
// start by splatting that value, then replace the non-constant lanes. This
|
|
// is better than the default, which will perform a separate initialization
|
|
// for each lane.
|
|
if (NumConstantLanes > 0 && usesOnlyOneConstantValue) {
|
|
SDValue Val = DAG.getNode(ARM64ISD::DUP, dl, VT, ConstantValue);
|
|
// Now insert the non-constant lanes.
|
|
for (unsigned i = 0; i < NumElts; ++i) {
|
|
SDValue V = Op.getOperand(i);
|
|
SDValue LaneIdx = DAG.getConstant(i, MVT::i64);
|
|
if (!isa<ConstantSDNode>(V) && !isa<ConstantFPSDNode>(V)) {
|
|
// Note that type legalization likely mucked about with the VT of the
|
|
// source operand, so we may have to convert it here before inserting.
|
|
Val = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Val, V, LaneIdx);
|
|
}
|
|
}
|
|
return Val;
|
|
}
|
|
|
|
// If all elements are constants and the case above didn't get hit, fall back
|
|
// to the default expansion, which will generate a load from the constant
|
|
// pool.
|
|
if (isConstant)
|
|
return SDValue();
|
|
|
|
// Empirical tests suggest this is rarely worth it for vectors of length <= 2.
|
|
if (NumElts >= 4) {
|
|
SDValue shuffle = ReconstructShuffle(Op, DAG);
|
|
if (shuffle != SDValue())
|
|
return shuffle;
|
|
}
|
|
|
|
// If all else fails, just use a sequence of INSERT_VECTOR_ELT when we
|
|
// know the default expansion would otherwise fall back on something even
|
|
// worse. For a vector with one or two non-undef values, that's
|
|
// scalar_to_vector for the elements followed by a shuffle (provided the
|
|
// shuffle is valid for the target) and materialization element by element
|
|
// on the stack followed by a load for everything else.
|
|
if (!isConstant && !usesOnlyOneValue) {
|
|
SDValue Vec = DAG.getUNDEF(VT);
|
|
SDValue Op0 = Op.getOperand(0);
|
|
unsigned ElemSize = VT.getVectorElementType().getSizeInBits();
|
|
unsigned i = 0;
|
|
// For 32 and 64 bit types, use INSERT_SUBREG for lane zero to
|
|
// a) Avoid a RMW dependency on the full vector register, and
|
|
// b) Allow the register coalescer to fold away the copy if the
|
|
// value is already in an S or D register.
|
|
if (Op0.getOpcode() != ISD::UNDEF && (ElemSize == 32 || ElemSize == 64)) {
|
|
unsigned SubIdx = ElemSize == 32 ? ARM64::ssub : ARM64::dsub;
|
|
MachineSDNode *N =
|
|
DAG.getMachineNode(TargetOpcode::INSERT_SUBREG, dl, VT, Vec, Op0,
|
|
DAG.getTargetConstant(SubIdx, MVT::i32));
|
|
Vec = SDValue(N, 0);
|
|
++i;
|
|
}
|
|
for (; i < NumElts; ++i) {
|
|
SDValue V = Op.getOperand(i);
|
|
if (V.getOpcode() == ISD::UNDEF)
|
|
continue;
|
|
SDValue LaneIdx = DAG.getConstant(i, MVT::i64);
|
|
Vec = DAG.getNode(ISD::INSERT_VECTOR_ELT, dl, VT, Vec, V, LaneIdx);
|
|
}
|
|
return Vec;
|
|
}
|
|
|
|
// Just use the default expansion. We failed to find a better alternative.
|
|
return SDValue();
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerINSERT_VECTOR_ELT(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
assert(Op.getOpcode() == ISD::INSERT_VECTOR_ELT && "Unknown opcode!");
|
|
|
|
// Check for non-constant lane.
|
|
if (!isa<ConstantSDNode>(Op.getOperand(2)))
|
|
return SDValue();
|
|
|
|
EVT VT = Op.getOperand(0).getValueType();
|
|
|
|
// Insertion/extraction are legal for V128 types.
|
|
if (VT == MVT::v16i8 || VT == MVT::v8i16 || VT == MVT::v4i32 ||
|
|
VT == MVT::v2i64 || VT == MVT::v4f32 || VT == MVT::v2f64)
|
|
return Op;
|
|
|
|
if (VT != MVT::v8i8 && VT != MVT::v4i16 && VT != MVT::v2i32 &&
|
|
VT != MVT::v1i64 && VT != MVT::v2f32)
|
|
return SDValue();
|
|
|
|
// For V64 types, we perform insertion by expanding the value
|
|
// to a V128 type and perform the insertion on that.
|
|
SDLoc DL(Op);
|
|
SDValue WideVec = WidenVector(Op.getOperand(0), DAG);
|
|
EVT WideTy = WideVec.getValueType();
|
|
|
|
SDValue Node = DAG.getNode(ISD::INSERT_VECTOR_ELT, DL, WideTy, WideVec,
|
|
Op.getOperand(1), Op.getOperand(2));
|
|
// Re-narrow the resultant vector.
|
|
return NarrowVector(Node, DAG);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerEXTRACT_VECTOR_ELT(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
assert(Op.getOpcode() == ISD::EXTRACT_VECTOR_ELT && "Unknown opcode!");
|
|
|
|
// Check for non-constant lane.
|
|
if (!isa<ConstantSDNode>(Op.getOperand(1)))
|
|
return SDValue();
|
|
|
|
EVT VT = Op.getOperand(0).getValueType();
|
|
|
|
// Insertion/extraction are legal for V128 types.
|
|
if (VT == MVT::v16i8 || VT == MVT::v8i16 || VT == MVT::v4i32 ||
|
|
VT == MVT::v2i64 || VT == MVT::v4f32 || VT == MVT::v2f64)
|
|
return Op;
|
|
|
|
if (VT != MVT::v8i8 && VT != MVT::v4i16 && VT != MVT::v2i32 &&
|
|
VT != MVT::v1i64 && VT != MVT::v2f32)
|
|
return SDValue();
|
|
|
|
// For V64 types, we perform extraction by expanding the value
|
|
// to a V128 type and perform the extraction on that.
|
|
SDLoc DL(Op);
|
|
SDValue WideVec = WidenVector(Op.getOperand(0), DAG);
|
|
EVT WideTy = WideVec.getValueType();
|
|
|
|
EVT ExtrTy = WideTy.getVectorElementType();
|
|
if (ExtrTy == MVT::i16 || ExtrTy == MVT::i8)
|
|
ExtrTy = MVT::i32;
|
|
|
|
// For extractions, we just return the result directly.
|
|
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, ExtrTy, WideVec,
|
|
Op.getOperand(1));
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerEXTRACT_SUBVECTOR(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
EVT VT = Op.getOperand(0).getValueType();
|
|
SDLoc dl(Op);
|
|
// Just in case...
|
|
if (!VT.isVector())
|
|
return SDValue();
|
|
|
|
ConstantSDNode *Cst = dyn_cast<ConstantSDNode>(Op.getOperand(1));
|
|
if (!Cst)
|
|
return SDValue();
|
|
unsigned Val = Cst->getZExtValue();
|
|
|
|
unsigned Size = Op.getValueType().getSizeInBits();
|
|
if (Val == 0) {
|
|
switch (Size) {
|
|
case 8:
|
|
return DAG.getTargetExtractSubreg(ARM64::bsub, dl, Op.getValueType(),
|
|
Op.getOperand(0));
|
|
case 16:
|
|
return DAG.getTargetExtractSubreg(ARM64::hsub, dl, Op.getValueType(),
|
|
Op.getOperand(0));
|
|
case 32:
|
|
return DAG.getTargetExtractSubreg(ARM64::ssub, dl, Op.getValueType(),
|
|
Op.getOperand(0));
|
|
case 64:
|
|
return DAG.getTargetExtractSubreg(ARM64::dsub, dl, Op.getValueType(),
|
|
Op.getOperand(0));
|
|
default:
|
|
llvm_unreachable("Unexpected vector type in extract_subvector!");
|
|
}
|
|
}
|
|
// If this is extracting the upper 64-bits of a 128-bit vector, we match
|
|
// that directly.
|
|
if (Size == 64 && Val * VT.getVectorElementType().getSizeInBits() == 64)
|
|
return Op;
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
bool ARM64TargetLowering::isShuffleMaskLegal(const SmallVectorImpl<int> &M,
|
|
EVT VT) const {
|
|
if (VT.getVectorNumElements() == 4 &&
|
|
(VT.is128BitVector() || VT.is64BitVector())) {
|
|
unsigned PFIndexes[4];
|
|
for (unsigned i = 0; i != 4; ++i) {
|
|
if (M[i] < 0)
|
|
PFIndexes[i] = 8;
|
|
else
|
|
PFIndexes[i] = M[i];
|
|
}
|
|
|
|
// Compute the index in the perfect shuffle table.
|
|
unsigned PFTableIndex = PFIndexes[0] * 9 * 9 * 9 + PFIndexes[1] * 9 * 9 +
|
|
PFIndexes[2] * 9 + PFIndexes[3];
|
|
unsigned PFEntry = PerfectShuffleTable[PFTableIndex];
|
|
unsigned Cost = (PFEntry >> 30);
|
|
|
|
if (Cost <= 4)
|
|
return true;
|
|
}
|
|
|
|
bool DummyBool;
|
|
int DummyInt;
|
|
unsigned DummyUnsigned;
|
|
|
|
return (ShuffleVectorSDNode::isSplatMask(&M[0], VT) || isREVMask(M, VT, 64) ||
|
|
isREVMask(M, VT, 32) || isREVMask(M, VT, 16) ||
|
|
isEXTMask(M, VT, DummyBool, DummyUnsigned) ||
|
|
// isTBLMask(M, VT) || // FIXME: Port TBL support from ARM.
|
|
isTRNMask(M, VT, DummyUnsigned) || isUZPMask(M, VT, DummyUnsigned) ||
|
|
isZIPMask(M, VT, DummyUnsigned) ||
|
|
isTRN_v_undef_Mask(M, VT, DummyUnsigned) ||
|
|
isUZP_v_undef_Mask(M, VT, DummyUnsigned) ||
|
|
isZIP_v_undef_Mask(M, VT, DummyUnsigned) ||
|
|
isINSMask(M, VT.getVectorNumElements(), DummyBool, DummyInt) ||
|
|
isConcatMask(M, VT, VT.getSizeInBits() == 128));
|
|
}
|
|
|
|
/// getVShiftImm - Check if this is a valid build_vector for the immediate
|
|
/// operand of a vector shift operation, where all the elements of the
|
|
/// build_vector must have the same constant integer value.
|
|
static bool getVShiftImm(SDValue Op, unsigned ElementBits, int64_t &Cnt) {
|
|
// Ignore bit_converts.
|
|
while (Op.getOpcode() == ISD::BITCAST)
|
|
Op = Op.getOperand(0);
|
|
BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(Op.getNode());
|
|
APInt SplatBits, SplatUndef;
|
|
unsigned SplatBitSize;
|
|
bool HasAnyUndefs;
|
|
if (!BVN || !BVN->isConstantSplat(SplatBits, SplatUndef, SplatBitSize,
|
|
HasAnyUndefs, ElementBits) ||
|
|
SplatBitSize > ElementBits)
|
|
return false;
|
|
Cnt = SplatBits.getSExtValue();
|
|
return true;
|
|
}
|
|
|
|
/// isVShiftLImm - Check if this is a valid build_vector for the immediate
|
|
/// operand of a vector shift left operation. That value must be in the range:
|
|
/// 0 <= Value < ElementBits for a left shift; or
|
|
/// 0 <= Value <= ElementBits for a long left shift.
|
|
static bool isVShiftLImm(SDValue Op, EVT VT, bool isLong, int64_t &Cnt) {
|
|
assert(VT.isVector() && "vector shift count is not a vector type");
|
|
unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
|
|
if (!getVShiftImm(Op, ElementBits, Cnt))
|
|
return false;
|
|
return (Cnt >= 0 && (isLong ? Cnt - 1 : Cnt) < ElementBits);
|
|
}
|
|
|
|
/// isVShiftRImm - Check if this is a valid build_vector for the immediate
|
|
/// operand of a vector shift right operation. For a shift opcode, the value
|
|
/// is positive, but for an intrinsic the value count must be negative. The
|
|
/// absolute value must be in the range:
|
|
/// 1 <= |Value| <= ElementBits for a right shift; or
|
|
/// 1 <= |Value| <= ElementBits/2 for a narrow right shift.
|
|
static bool isVShiftRImm(SDValue Op, EVT VT, bool isNarrow, bool isIntrinsic,
|
|
int64_t &Cnt) {
|
|
assert(VT.isVector() && "vector shift count is not a vector type");
|
|
unsigned ElementBits = VT.getVectorElementType().getSizeInBits();
|
|
if (!getVShiftImm(Op, ElementBits, Cnt))
|
|
return false;
|
|
if (isIntrinsic)
|
|
Cnt = -Cnt;
|
|
return (Cnt >= 1 && Cnt <= (isNarrow ? ElementBits / 2 : ElementBits));
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVectorSRA_SRL_SHL(SDValue Op,
|
|
SelectionDAG &DAG) const {
|
|
EVT VT = Op.getValueType();
|
|
SDLoc DL(Op);
|
|
int64_t Cnt;
|
|
|
|
if (!Op.getOperand(1).getValueType().isVector())
|
|
return Op;
|
|
unsigned EltSize = VT.getVectorElementType().getSizeInBits();
|
|
|
|
switch (Op.getOpcode()) {
|
|
default:
|
|
llvm_unreachable("unexpected shift opcode");
|
|
|
|
case ISD::SHL:
|
|
if (isVShiftLImm(Op.getOperand(1), VT, false, Cnt) && Cnt < EltSize)
|
|
return DAG.getNode(ARM64ISD::VSHL, SDLoc(Op), VT, Op.getOperand(0),
|
|
DAG.getConstant(Cnt, MVT::i32));
|
|
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
|
|
DAG.getConstant(Intrinsic::arm64_neon_ushl, MVT::i32),
|
|
Op.getOperand(0), Op.getOperand(1));
|
|
case ISD::SRA:
|
|
case ISD::SRL:
|
|
// Right shift immediate
|
|
if (isVShiftRImm(Op.getOperand(1), VT, false, false, Cnt) &&
|
|
Cnt < EltSize) {
|
|
unsigned Opc =
|
|
(Op.getOpcode() == ISD::SRA) ? ARM64ISD::VASHR : ARM64ISD::VLSHR;
|
|
return DAG.getNode(Opc, SDLoc(Op), VT, Op.getOperand(0),
|
|
DAG.getConstant(Cnt, MVT::i32));
|
|
}
|
|
|
|
// Right shift register. Note, there is not a shift right register
|
|
// instruction, but the shift left register instruction takes a signed
|
|
// value, where negative numbers specify a right shift.
|
|
unsigned Opc = (Op.getOpcode() == ISD::SRA) ? Intrinsic::arm64_neon_sshl
|
|
: Intrinsic::arm64_neon_ushl;
|
|
// negate the shift amount
|
|
SDValue NegShift = DAG.getNode(ARM64ISD::NEG, DL, VT, Op.getOperand(1));
|
|
SDValue NegShiftLeft =
|
|
DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VT,
|
|
DAG.getConstant(Opc, MVT::i32), Op.getOperand(0), NegShift);
|
|
return NegShiftLeft;
|
|
}
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
static SDValue EmitVectorComparison(SDValue LHS, SDValue RHS,
|
|
ARM64CC::CondCode CC, bool NoNans, EVT VT,
|
|
SDLoc dl, SelectionDAG &DAG) {
|
|
EVT SrcVT = LHS.getValueType();
|
|
|
|
BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(RHS.getNode());
|
|
APInt CnstBits(VT.getSizeInBits(), 0);
|
|
APInt UndefBits(VT.getSizeInBits(), 0);
|
|
bool IsCnst = BVN && resolveBuildVector(BVN, CnstBits, UndefBits);
|
|
bool IsZero = IsCnst && (CnstBits == 0);
|
|
|
|
if (SrcVT.getVectorElementType().isFloatingPoint()) {
|
|
switch (CC) {
|
|
default:
|
|
return SDValue();
|
|
case ARM64CC::NE: {
|
|
SDValue Fcmeq;
|
|
if (IsZero)
|
|
Fcmeq = DAG.getNode(ARM64ISD::FCMEQz, dl, VT, LHS);
|
|
else
|
|
Fcmeq = DAG.getNode(ARM64ISD::FCMEQ, dl, VT, LHS, RHS);
|
|
return DAG.getNode(ARM64ISD::NOT, dl, VT, Fcmeq);
|
|
}
|
|
case ARM64CC::EQ:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::FCMEQz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::FCMEQ, dl, VT, LHS, RHS);
|
|
case ARM64CC::GE:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::FCMGEz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::FCMGE, dl, VT, LHS, RHS);
|
|
case ARM64CC::GT:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::FCMGTz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::FCMGT, dl, VT, LHS, RHS);
|
|
case ARM64CC::LS:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::FCMLEz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::FCMGE, dl, VT, RHS, LHS);
|
|
case ARM64CC::LT:
|
|
if (!NoNans)
|
|
return SDValue();
|
|
// If we ignore NaNs then we can use to the MI implementation.
|
|
// Fallthrough.
|
|
case ARM64CC::MI:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::FCMLTz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::FCMGT, dl, VT, RHS, LHS);
|
|
}
|
|
}
|
|
|
|
switch (CC) {
|
|
default:
|
|
return SDValue();
|
|
case ARM64CC::NE: {
|
|
SDValue Cmeq;
|
|
if (IsZero)
|
|
Cmeq = DAG.getNode(ARM64ISD::CMEQz, dl, VT, LHS);
|
|
else
|
|
Cmeq = DAG.getNode(ARM64ISD::CMEQ, dl, VT, LHS, RHS);
|
|
return DAG.getNode(ARM64ISD::NOT, dl, VT, Cmeq);
|
|
}
|
|
case ARM64CC::EQ:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::CMEQz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::CMEQ, dl, VT, LHS, RHS);
|
|
case ARM64CC::GE:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::CMGEz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::CMGE, dl, VT, LHS, RHS);
|
|
case ARM64CC::GT:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::CMGTz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::CMGT, dl, VT, LHS, RHS);
|
|
case ARM64CC::LE:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::CMLEz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::CMGE, dl, VT, RHS, LHS);
|
|
case ARM64CC::LS:
|
|
return DAG.getNode(ARM64ISD::CMHS, dl, VT, RHS, LHS);
|
|
case ARM64CC::CC:
|
|
return DAG.getNode(ARM64ISD::CMHI, dl, VT, RHS, LHS);
|
|
case ARM64CC::LT:
|
|
if (IsZero)
|
|
return DAG.getNode(ARM64ISD::CMLTz, dl, VT, LHS);
|
|
return DAG.getNode(ARM64ISD::CMGT, dl, VT, RHS, LHS);
|
|
case ARM64CC::HI:
|
|
return DAG.getNode(ARM64ISD::CMHI, dl, VT, LHS, RHS);
|
|
case ARM64CC::CS:
|
|
return DAG.getNode(ARM64ISD::CMHS, dl, VT, LHS, RHS);
|
|
}
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::LowerVSETCC(SDValue Op, SelectionDAG &DAG) const {
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
|
|
SDValue LHS = Op.getOperand(0);
|
|
SDValue RHS = Op.getOperand(1);
|
|
SDLoc dl(Op);
|
|
|
|
if (LHS.getValueType().getVectorElementType().isInteger()) {
|
|
assert(LHS.getValueType() == RHS.getValueType());
|
|
ARM64CC::CondCode ARM64CC = changeIntCCToARM64CC(CC);
|
|
return EmitVectorComparison(LHS, RHS, ARM64CC, false, Op.getValueType(), dl,
|
|
DAG);
|
|
}
|
|
|
|
assert(LHS.getValueType().getVectorElementType() == MVT::f32 ||
|
|
LHS.getValueType().getVectorElementType() == MVT::f64);
|
|
|
|
// Unfortunately, the mapping of LLVM FP CC's onto ARM64 CC's isn't totally
|
|
// clean. Some of them require two branches to implement.
|
|
ARM64CC::CondCode CC1, CC2;
|
|
bool ShouldInvert;
|
|
changeVectorFPCCToARM64CC(CC, CC1, CC2, ShouldInvert);
|
|
|
|
bool NoNaNs = getTargetMachine().Options.NoNaNsFPMath;
|
|
SDValue Cmp =
|
|
EmitVectorComparison(LHS, RHS, CC1, NoNaNs, Op.getValueType(), dl, DAG);
|
|
if (!Cmp.getNode())
|
|
return SDValue();
|
|
|
|
if (CC2 != ARM64CC::AL) {
|
|
SDValue Cmp2 =
|
|
EmitVectorComparison(LHS, RHS, CC2, NoNaNs, Op.getValueType(), dl, DAG);
|
|
if (!Cmp2.getNode())
|
|
return SDValue();
|
|
|
|
Cmp = DAG.getNode(ISD::OR, dl, Cmp.getValueType(), Cmp, Cmp2);
|
|
}
|
|
|
|
if (ShouldInvert)
|
|
return Cmp = DAG.getNOT(dl, Cmp, Cmp.getValueType());
|
|
|
|
return Cmp;
|
|
}
|
|
|
|
/// getTgtMemIntrinsic - Represent NEON load and store intrinsics as
|
|
/// MemIntrinsicNodes. The associated MachineMemOperands record the alignment
|
|
/// specified in the intrinsic calls.
|
|
bool ARM64TargetLowering::getTgtMemIntrinsic(IntrinsicInfo &Info,
|
|
const CallInst &I,
|
|
unsigned Intrinsic) const {
|
|
switch (Intrinsic) {
|
|
case Intrinsic::arm64_neon_ld2:
|
|
case Intrinsic::arm64_neon_ld3:
|
|
case Intrinsic::arm64_neon_ld4:
|
|
case Intrinsic::arm64_neon_ld2lane:
|
|
case Intrinsic::arm64_neon_ld3lane:
|
|
case Intrinsic::arm64_neon_ld4lane:
|
|
case Intrinsic::arm64_neon_ld2r:
|
|
case Intrinsic::arm64_neon_ld3r:
|
|
case Intrinsic::arm64_neon_ld4r: {
|
|
Info.opc = ISD::INTRINSIC_W_CHAIN;
|
|
// Conservatively set memVT to the entire set of vectors loaded.
|
|
uint64_t NumElts = getDataLayout()->getTypeAllocSize(I.getType()) / 8;
|
|
Info.memVT = EVT::getVectorVT(I.getType()->getContext(), MVT::i64, NumElts);
|
|
Info.ptrVal = I.getArgOperand(I.getNumArgOperands() - 1);
|
|
Info.offset = 0;
|
|
Info.align = 0;
|
|
Info.vol = false; // volatile loads with NEON intrinsics not supported
|
|
Info.readMem = true;
|
|
Info.writeMem = false;
|
|
return true;
|
|
}
|
|
case Intrinsic::arm64_neon_st2:
|
|
case Intrinsic::arm64_neon_st3:
|
|
case Intrinsic::arm64_neon_st4:
|
|
case Intrinsic::arm64_neon_st2lane:
|
|
case Intrinsic::arm64_neon_st3lane:
|
|
case Intrinsic::arm64_neon_st4lane: {
|
|
Info.opc = ISD::INTRINSIC_VOID;
|
|
// Conservatively set memVT to the entire set of vectors stored.
|
|
unsigned NumElts = 0;
|
|
for (unsigned ArgI = 1, ArgE = I.getNumArgOperands(); ArgI < ArgE; ++ArgI) {
|
|
Type *ArgTy = I.getArgOperand(ArgI)->getType();
|
|
if (!ArgTy->isVectorTy())
|
|
break;
|
|
NumElts += getDataLayout()->getTypeAllocSize(ArgTy) / 8;
|
|
}
|
|
Info.memVT = EVT::getVectorVT(I.getType()->getContext(), MVT::i64, NumElts);
|
|
Info.ptrVal = I.getArgOperand(I.getNumArgOperands() - 1);
|
|
Info.offset = 0;
|
|
Info.align = 0;
|
|
Info.vol = false; // volatile stores with NEON intrinsics not supported
|
|
Info.readMem = false;
|
|
Info.writeMem = true;
|
|
return true;
|
|
}
|
|
case Intrinsic::arm64_ldaxr:
|
|
case Intrinsic::arm64_ldxr: {
|
|
PointerType *PtrTy = cast<PointerType>(I.getArgOperand(0)->getType());
|
|
Info.opc = ISD::INTRINSIC_W_CHAIN;
|
|
Info.memVT = MVT::getVT(PtrTy->getElementType());
|
|
Info.ptrVal = I.getArgOperand(0);
|
|
Info.offset = 0;
|
|
Info.align = getDataLayout()->getABITypeAlignment(PtrTy->getElementType());
|
|
Info.vol = true;
|
|
Info.readMem = true;
|
|
Info.writeMem = false;
|
|
return true;
|
|
}
|
|
case Intrinsic::arm64_stlxr:
|
|
case Intrinsic::arm64_stxr: {
|
|
PointerType *PtrTy = cast<PointerType>(I.getArgOperand(1)->getType());
|
|
Info.opc = ISD::INTRINSIC_W_CHAIN;
|
|
Info.memVT = MVT::getVT(PtrTy->getElementType());
|
|
Info.ptrVal = I.getArgOperand(1);
|
|
Info.offset = 0;
|
|
Info.align = getDataLayout()->getABITypeAlignment(PtrTy->getElementType());
|
|
Info.vol = true;
|
|
Info.readMem = false;
|
|
Info.writeMem = true;
|
|
return true;
|
|
}
|
|
case Intrinsic::arm64_ldaxp:
|
|
case Intrinsic::arm64_ldxp: {
|
|
Info.opc = ISD::INTRINSIC_W_CHAIN;
|
|
Info.memVT = MVT::i128;
|
|
Info.ptrVal = I.getArgOperand(0);
|
|
Info.offset = 0;
|
|
Info.align = 16;
|
|
Info.vol = true;
|
|
Info.readMem = true;
|
|
Info.writeMem = false;
|
|
return true;
|
|
}
|
|
case Intrinsic::arm64_stlxp:
|
|
case Intrinsic::arm64_stxp: {
|
|
Info.opc = ISD::INTRINSIC_W_CHAIN;
|
|
Info.memVT = MVT::i128;
|
|
Info.ptrVal = I.getArgOperand(2);
|
|
Info.offset = 0;
|
|
Info.align = 16;
|
|
Info.vol = true;
|
|
Info.readMem = false;
|
|
Info.writeMem = true;
|
|
return true;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
// Truncations from 64-bit GPR to 32-bit GPR is free.
|
|
bool ARM64TargetLowering::isTruncateFree(Type *Ty1, Type *Ty2) const {
|
|
if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
|
|
return false;
|
|
unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
|
|
unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
|
|
if (NumBits1 <= NumBits2)
|
|
return false;
|
|
return true;
|
|
}
|
|
bool ARM64TargetLowering::isTruncateFree(EVT VT1, EVT VT2) const {
|
|
if (!VT1.isInteger() || !VT2.isInteger())
|
|
return false;
|
|
unsigned NumBits1 = VT1.getSizeInBits();
|
|
unsigned NumBits2 = VT2.getSizeInBits();
|
|
if (NumBits1 <= NumBits2)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
// All 32-bit GPR operations implicitly zero the high-half of the corresponding
|
|
// 64-bit GPR.
|
|
bool ARM64TargetLowering::isZExtFree(Type *Ty1, Type *Ty2) const {
|
|
if (!Ty1->isIntegerTy() || !Ty2->isIntegerTy())
|
|
return false;
|
|
unsigned NumBits1 = Ty1->getPrimitiveSizeInBits();
|
|
unsigned NumBits2 = Ty2->getPrimitiveSizeInBits();
|
|
if (NumBits1 == 32 && NumBits2 == 64)
|
|
return true;
|
|
return false;
|
|
}
|
|
bool ARM64TargetLowering::isZExtFree(EVT VT1, EVT VT2) const {
|
|
if (!VT1.isInteger() || !VT2.isInteger())
|
|
return false;
|
|
unsigned NumBits1 = VT1.getSizeInBits();
|
|
unsigned NumBits2 = VT2.getSizeInBits();
|
|
if (NumBits1 == 32 && NumBits2 == 64)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
bool ARM64TargetLowering::isZExtFree(SDValue Val, EVT VT2) const {
|
|
EVT VT1 = Val.getValueType();
|
|
if (isZExtFree(VT1, VT2)) {
|
|
return true;
|
|
}
|
|
|
|
if (Val.getOpcode() != ISD::LOAD)
|
|
return false;
|
|
|
|
// 8-, 16-, and 32-bit integer loads all implicitly zero-extend.
|
|
return (VT1.isSimple() && VT1.isInteger() && VT2.isSimple() &&
|
|
VT2.isInteger() && VT1.getSizeInBits() <= 32);
|
|
}
|
|
|
|
bool ARM64TargetLowering::hasPairedLoad(Type *LoadedType,
|
|
unsigned &RequiredAligment) const {
|
|
if (!LoadedType->isIntegerTy() && !LoadedType->isFloatTy())
|
|
return false;
|
|
// Cyclone supports unaligned accesses.
|
|
RequiredAligment = 0;
|
|
unsigned NumBits = LoadedType->getPrimitiveSizeInBits();
|
|
return NumBits == 32 || NumBits == 64;
|
|
}
|
|
|
|
bool ARM64TargetLowering::hasPairedLoad(EVT LoadedType,
|
|
unsigned &RequiredAligment) const {
|
|
if (!LoadedType.isSimple() ||
|
|
(!LoadedType.isInteger() && !LoadedType.isFloatingPoint()))
|
|
return false;
|
|
// Cyclone supports unaligned accesses.
|
|
RequiredAligment = 0;
|
|
unsigned NumBits = LoadedType.getSizeInBits();
|
|
return NumBits == 32 || NumBits == 64;
|
|
}
|
|
|
|
static bool memOpAlign(unsigned DstAlign, unsigned SrcAlign,
|
|
unsigned AlignCheck) {
|
|
return ((SrcAlign == 0 || SrcAlign % AlignCheck == 0) &&
|
|
(DstAlign == 0 || DstAlign % AlignCheck == 0));
|
|
}
|
|
|
|
EVT ARM64TargetLowering::getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
|
|
unsigned SrcAlign, bool IsMemset,
|
|
bool ZeroMemset, bool MemcpyStrSrc,
|
|
MachineFunction &MF) const {
|
|
// Don't use AdvSIMD to implement 16-byte memset. It would have taken one
|
|
// instruction to materialize the v2i64 zero and one store (with restrictive
|
|
// addressing mode). Just do two i64 store of zero-registers.
|
|
bool Fast;
|
|
const Function *F = MF.getFunction();
|
|
if (!IsMemset && Size >= 16 &&
|
|
!F->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
|
|
Attribute::NoImplicitFloat) &&
|
|
(memOpAlign(SrcAlign, DstAlign, 16) ||
|
|
(allowsUnalignedMemoryAccesses(MVT::v2i64, 0, &Fast) && Fast)))
|
|
return MVT::v2i64;
|
|
|
|
return Size >= 8 ? MVT::i64 : MVT::i32;
|
|
}
|
|
|
|
// 12-bit optionally shifted immediates are legal for adds.
|
|
bool ARM64TargetLowering::isLegalAddImmediate(int64_t Immed) const {
|
|
if ((Immed >> 12) == 0 || ((Immed & 0xfff) == 0 && Immed >> 24 == 0))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
// Integer comparisons are implemented with ADDS/SUBS, so the range of valid
|
|
// immediates is the same as for an add or a sub.
|
|
bool ARM64TargetLowering::isLegalICmpImmediate(int64_t Immed) const {
|
|
if (Immed < 0)
|
|
Immed *= -1;
|
|
return isLegalAddImmediate(Immed);
|
|
}
|
|
|
|
/// isLegalAddressingMode - Return true if the addressing mode represented
|
|
/// by AM is legal for this target, for a load/store of the specified type.
|
|
bool ARM64TargetLowering::isLegalAddressingMode(const AddrMode &AM,
|
|
Type *Ty) const {
|
|
// ARM64 has five basic addressing modes:
|
|
// reg
|
|
// reg + 9-bit signed offset
|
|
// reg + SIZE_IN_BYTES * 12-bit unsigned offset
|
|
// reg1 + reg2
|
|
// reg + SIZE_IN_BYTES * reg
|
|
|
|
// No global is ever allowed as a base.
|
|
if (AM.BaseGV)
|
|
return false;
|
|
|
|
// No reg+reg+imm addressing.
|
|
if (AM.HasBaseReg && AM.BaseOffs && AM.Scale)
|
|
return false;
|
|
|
|
// check reg + imm case:
|
|
// i.e., reg + 0, reg + imm9, reg + SIZE_IN_BYTES * uimm12
|
|
uint64_t NumBytes = 0;
|
|
if (Ty->isSized()) {
|
|
uint64_t NumBits = getDataLayout()->getTypeSizeInBits(Ty);
|
|
NumBytes = NumBits / 8;
|
|
if (!isPowerOf2_64(NumBits))
|
|
NumBytes = 0;
|
|
}
|
|
|
|
if (!AM.Scale) {
|
|
int64_t Offset = AM.BaseOffs;
|
|
|
|
// 9-bit signed offset
|
|
if (Offset >= -(1LL << 9) && Offset <= (1LL << 9) - 1)
|
|
return true;
|
|
|
|
// 12-bit unsigned offset
|
|
unsigned shift = Log2_64(NumBytes);
|
|
if (NumBytes && Offset > 0 && (Offset / NumBytes) <= (1LL << 12) - 1 &&
|
|
// Must be a multiple of NumBytes (NumBytes is a power of 2)
|
|
(Offset >> shift) << shift == Offset)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
// Check reg1 + SIZE_IN_BYTES * reg2 and reg1 + reg2
|
|
|
|
if (!AM.Scale || AM.Scale == 1 ||
|
|
(AM.Scale > 0 && (uint64_t)AM.Scale == NumBytes))
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
int ARM64TargetLowering::getScalingFactorCost(const AddrMode &AM,
|
|
Type *Ty) const {
|
|
// Scaling factors are not free at all.
|
|
// Operands | Rt Latency
|
|
// -------------------------------------------
|
|
// Rt, [Xn, Xm] | 4
|
|
// -------------------------------------------
|
|
// Rt, [Xn, Xm, lsl #imm] | Rn: 4 Rm: 5
|
|
// Rt, [Xn, Wm, <extend> #imm] |
|
|
if (isLegalAddressingMode(AM, Ty))
|
|
// Scale represents reg2 * scale, thus account for 1 if
|
|
// it is not equal to 0 or 1.
|
|
return AM.Scale != 0 && AM.Scale != 1;
|
|
return -1;
|
|
}
|
|
|
|
bool ARM64TargetLowering::isFMAFasterThanFMulAndFAdd(EVT VT) const {
|
|
VT = VT.getScalarType();
|
|
|
|
if (!VT.isSimple())
|
|
return false;
|
|
|
|
switch (VT.getSimpleVT().SimpleTy) {
|
|
case MVT::f32:
|
|
case MVT::f64:
|
|
return true;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
const MCPhysReg *
|
|
ARM64TargetLowering::getScratchRegisters(CallingConv::ID) const {
|
|
// LR is a callee-save register, but we must treat it as clobbered by any call
|
|
// site. Hence we include LR in the scratch registers, which are in turn added
|
|
// as implicit-defs for stackmaps and patchpoints.
|
|
static const MCPhysReg ScratchRegs[] = {
|
|
ARM64::X16, ARM64::X17, ARM64::LR, 0
|
|
};
|
|
return ScratchRegs;
|
|
}
|
|
|
|
bool ARM64TargetLowering::shouldConvertConstantLoadToIntImm(const APInt &Imm,
|
|
Type *Ty) const {
|
|
assert(Ty->isIntegerTy());
|
|
|
|
unsigned BitSize = Ty->getPrimitiveSizeInBits();
|
|
if (BitSize == 0)
|
|
return false;
|
|
|
|
int64_t Val = Imm.getSExtValue();
|
|
if (Val == 0 || ARM64_AM::isLogicalImmediate(Val, BitSize))
|
|
return true;
|
|
|
|
if ((int64_t)Val < 0)
|
|
Val = ~Val;
|
|
if (BitSize == 32)
|
|
Val &= (1LL << 32) - 1;
|
|
|
|
unsigned LZ = countLeadingZeros((uint64_t)Val);
|
|
unsigned Shift = (63 - LZ) / 16;
|
|
// MOVZ is free so return true for one or fewer MOVK.
|
|
return (Shift < 3) ? true : false;
|
|
}
|
|
|
|
// Generate SUBS and CSEL for integer abs.
|
|
static SDValue performIntegerAbsCombine(SDNode *N, SelectionDAG &DAG) {
|
|
EVT VT = N->getValueType(0);
|
|
|
|
SDValue N0 = N->getOperand(0);
|
|
SDValue N1 = N->getOperand(1);
|
|
SDLoc DL(N);
|
|
|
|
// Check pattern of XOR(ADD(X,Y), Y) where Y is SRA(X, size(X)-1)
|
|
// and change it to SUB and CSEL.
|
|
if (VT.isInteger() && N->getOpcode() == ISD::XOR &&
|
|
N0.getOpcode() == ISD::ADD && N0.getOperand(1) == N1 &&
|
|
N1.getOpcode() == ISD::SRA && N1.getOperand(0) == N0.getOperand(0))
|
|
if (ConstantSDNode *Y1C = dyn_cast<ConstantSDNode>(N1.getOperand(1)))
|
|
if (Y1C->getAPIntValue() == VT.getSizeInBits() - 1) {
|
|
SDValue Neg = DAG.getNode(ISD::SUB, DL, VT, DAG.getConstant(0, VT),
|
|
N0.getOperand(0));
|
|
// Generate SUBS & CSEL.
|
|
SDValue Cmp =
|
|
DAG.getNode(ARM64ISD::SUBS, DL, DAG.getVTList(VT, MVT::i32),
|
|
N0.getOperand(0), DAG.getConstant(0, VT));
|
|
return DAG.getNode(ARM64ISD::CSEL, DL, VT, N0.getOperand(0), Neg,
|
|
DAG.getConstant(ARM64CC::PL, MVT::i32),
|
|
SDValue(Cmp.getNode(), 1));
|
|
}
|
|
return SDValue();
|
|
}
|
|
|
|
// performXorCombine - Attempts to handle integer ABS.
|
|
static SDValue performXorCombine(SDNode *N, SelectionDAG &DAG,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
const ARM64Subtarget *Subtarget) {
|
|
if (DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
|
|
return performIntegerAbsCombine(N, DAG);
|
|
}
|
|
|
|
static SDValue performMulCombine(SDNode *N, SelectionDAG &DAG,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
const ARM64Subtarget *Subtarget) {
|
|
if (DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
|
|
// Multiplication of a power of two plus/minus one can be done more
|
|
// cheaply as as shift+add/sub. For now, this is true unilaterally. If
|
|
// future CPUs have a cheaper MADD instruction, this may need to be
|
|
// gated on a subtarget feature. For Cyclone, 32-bit MADD is 4 cycles and
|
|
// 64-bit is 5 cycles, so this is always a win.
|
|
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(N->getOperand(1))) {
|
|
APInt Value = C->getAPIntValue();
|
|
EVT VT = N->getValueType(0);
|
|
APInt VP1 = Value + 1;
|
|
if (VP1.isPowerOf2()) {
|
|
// Multiplying by one less than a power of two, replace with a shift
|
|
// and a subtract.
|
|
SDValue ShiftedVal =
|
|
DAG.getNode(ISD::SHL, SDLoc(N), VT, N->getOperand(0),
|
|
DAG.getConstant(VP1.logBase2(), MVT::i64));
|
|
return DAG.getNode(ISD::SUB, SDLoc(N), VT, ShiftedVal, N->getOperand(0));
|
|
}
|
|
APInt VM1 = Value - 1;
|
|
if (VM1.isPowerOf2()) {
|
|
// Multiplying by one more than a power of two, replace with a shift
|
|
// and an add.
|
|
SDValue ShiftedVal =
|
|
DAG.getNode(ISD::SHL, SDLoc(N), VT, N->getOperand(0),
|
|
DAG.getConstant(VM1.logBase2(), MVT::i64));
|
|
return DAG.getNode(ISD::ADD, SDLoc(N), VT, ShiftedVal, N->getOperand(0));
|
|
}
|
|
}
|
|
return SDValue();
|
|
}
|
|
|
|
static SDValue performIntToFpCombine(SDNode *N, SelectionDAG &DAG) {
|
|
EVT VT = N->getValueType(0);
|
|
if (VT != MVT::f32 && VT != MVT::f64)
|
|
return SDValue();
|
|
// Only optimize when the source and destination types have the same width.
|
|
if (VT.getSizeInBits() != N->getOperand(0).getValueType().getSizeInBits())
|
|
return SDValue();
|
|
|
|
// If the result of an integer load is only used by an integer-to-float
|
|
// conversion, use a fp load instead and a AdvSIMD scalar {S|U}CVTF instead.
|
|
// This eliminates an "integer-to-vector-move UOP and improve throughput.
|
|
SDValue N0 = N->getOperand(0);
|
|
if (ISD::isNormalLoad(N0.getNode()) && N0.hasOneUse() &&
|
|
// Do not change the width of a volatile load.
|
|
!cast<LoadSDNode>(N0)->isVolatile()) {
|
|
LoadSDNode *LN0 = cast<LoadSDNode>(N0);
|
|
SDValue Load = DAG.getLoad(VT, SDLoc(N), LN0->getChain(), LN0->getBasePtr(),
|
|
LN0->getPointerInfo(), LN0->isVolatile(),
|
|
LN0->isNonTemporal(), LN0->isInvariant(),
|
|
LN0->getAlignment());
|
|
|
|
// Make sure successors of the original load stay after it by updating them
|
|
// to use the new Chain.
|
|
DAG.ReplaceAllUsesOfValueWith(SDValue(LN0, 1), Load.getValue(1));
|
|
|
|
unsigned Opcode =
|
|
(N->getOpcode() == ISD::SINT_TO_FP) ? ARM64ISD::SITOF : ARM64ISD::UITOF;
|
|
return DAG.getNode(Opcode, SDLoc(N), VT, Load);
|
|
}
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
/// An EXTR instruction is made up of two shifts, ORed together. This helper
|
|
/// searches for and classifies those shifts.
|
|
static bool findEXTRHalf(SDValue N, SDValue &Src, uint32_t &ShiftAmount,
|
|
bool &FromHi) {
|
|
if (N.getOpcode() == ISD::SHL)
|
|
FromHi = false;
|
|
else if (N.getOpcode() == ISD::SRL)
|
|
FromHi = true;
|
|
else
|
|
return false;
|
|
|
|
if (!isa<ConstantSDNode>(N.getOperand(1)))
|
|
return false;
|
|
|
|
ShiftAmount = N->getConstantOperandVal(1);
|
|
Src = N->getOperand(0);
|
|
return true;
|
|
}
|
|
|
|
/// EXTR instruction extracts a contiguous chunk of bits from two existing
|
|
/// registers viewed as a high/low pair. This function looks for the pattern:
|
|
/// (or (shl VAL1, #N), (srl VAL2, #RegWidth-N)) and replaces it with an
|
|
/// EXTR. Can't quite be done in TableGen because the two immediates aren't
|
|
/// independent.
|
|
static SDValue tryCombineToEXTR(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI) {
|
|
SelectionDAG &DAG = DCI.DAG;
|
|
SDLoc DL(N);
|
|
EVT VT = N->getValueType(0);
|
|
|
|
assert(N->getOpcode() == ISD::OR && "Unexpected root");
|
|
|
|
if (VT != MVT::i32 && VT != MVT::i64)
|
|
return SDValue();
|
|
|
|
SDValue LHS;
|
|
uint32_t ShiftLHS = 0;
|
|
bool LHSFromHi = 0;
|
|
if (!findEXTRHalf(N->getOperand(0), LHS, ShiftLHS, LHSFromHi))
|
|
return SDValue();
|
|
|
|
SDValue RHS;
|
|
uint32_t ShiftRHS = 0;
|
|
bool RHSFromHi = 0;
|
|
if (!findEXTRHalf(N->getOperand(1), RHS, ShiftRHS, RHSFromHi))
|
|
return SDValue();
|
|
|
|
// If they're both trying to come from the high part of the register, they're
|
|
// not really an EXTR.
|
|
if (LHSFromHi == RHSFromHi)
|
|
return SDValue();
|
|
|
|
if (ShiftLHS + ShiftRHS != VT.getSizeInBits())
|
|
return SDValue();
|
|
|
|
if (LHSFromHi) {
|
|
std::swap(LHS, RHS);
|
|
std::swap(ShiftLHS, ShiftRHS);
|
|
}
|
|
|
|
return DAG.getNode(ARM64ISD::EXTR, DL, VT, LHS, RHS,
|
|
DAG.getConstant(ShiftRHS, MVT::i64));
|
|
}
|
|
|
|
static SDValue tryCombineToBSL(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI) {
|
|
EVT VT = N->getValueType(0);
|
|
SelectionDAG &DAG = DCI.DAG;
|
|
SDLoc DL(N);
|
|
|
|
if (!VT.isVector())
|
|
return SDValue();
|
|
|
|
SDValue N0 = N->getOperand(0);
|
|
if (N0.getOpcode() != ISD::AND)
|
|
return SDValue();
|
|
|
|
SDValue N1 = N->getOperand(1);
|
|
if (N1.getOpcode() != ISD::AND)
|
|
return SDValue();
|
|
|
|
// We only have to look for constant vectors here since the general, variable
|
|
// case can be handled in TableGen.
|
|
unsigned Bits = VT.getVectorElementType().getSizeInBits();
|
|
uint64_t BitMask = Bits == 64 ? -1ULL : ((1ULL << Bits) - 1);
|
|
for (int i = 1; i >= 0; --i)
|
|
for (int j = 1; j >= 0; --j) {
|
|
BuildVectorSDNode *BVN0 = dyn_cast<BuildVectorSDNode>(N0->getOperand(i));
|
|
BuildVectorSDNode *BVN1 = dyn_cast<BuildVectorSDNode>(N1->getOperand(j));
|
|
if (!BVN0 || !BVN1)
|
|
continue;
|
|
|
|
bool FoundMatch = true;
|
|
for (unsigned k = 0; k < VT.getVectorNumElements(); ++k) {
|
|
ConstantSDNode *CN0 = dyn_cast<ConstantSDNode>(BVN0->getOperand(k));
|
|
ConstantSDNode *CN1 = dyn_cast<ConstantSDNode>(BVN1->getOperand(k));
|
|
if (!CN0 || !CN1 ||
|
|
CN0->getZExtValue() != (BitMask & ~CN1->getZExtValue())) {
|
|
FoundMatch = false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (FoundMatch)
|
|
return DAG.getNode(ARM64ISD::BSL, DL, VT, SDValue(BVN0, 0),
|
|
N0->getOperand(1 - i), N1->getOperand(1 - j));
|
|
}
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
static SDValue performORCombine(SDNode *N, TargetLowering::DAGCombinerInfo &DCI,
|
|
const ARM64Subtarget *Subtarget) {
|
|
// Attempt to form an EXTR from (or (shl VAL1, #N), (srl VAL2, #RegWidth-N))
|
|
if (!EnableARM64ExtrGeneration)
|
|
return SDValue();
|
|
SelectionDAG &DAG = DCI.DAG;
|
|
EVT VT = N->getValueType(0);
|
|
|
|
if (!DAG.getTargetLoweringInfo().isTypeLegal(VT))
|
|
return SDValue();
|
|
|
|
SDValue Res = tryCombineToEXTR(N, DCI);
|
|
if (Res.getNode())
|
|
return Res;
|
|
|
|
Res = tryCombineToBSL(N, DCI);
|
|
if (Res.getNode())
|
|
return Res;
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
static SDValue performBitcastCombine(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG) {
|
|
// Wait 'til after everything is legalized to try this. That way we have
|
|
// legal vector types and such.
|
|
if (DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
|
|
// Remove extraneous bitcasts around an extract_subvector.
|
|
// For example,
|
|
// (v4i16 (bitconvert
|
|
// (extract_subvector (v2i64 (bitconvert (v8i16 ...)), (i64 1)))))
|
|
// becomes
|
|
// (extract_subvector ((v8i16 ...), (i64 4)))
|
|
|
|
// Only interested in 64-bit vectors as the ultimate result.
|
|
EVT VT = N->getValueType(0);
|
|
if (!VT.isVector())
|
|
return SDValue();
|
|
if (VT.getSimpleVT().getSizeInBits() != 64)
|
|
return SDValue();
|
|
// Is the operand an extract_subvector starting at the beginning or halfway
|
|
// point of the vector? A low half may also come through as an
|
|
// EXTRACT_SUBREG, so look for that, too.
|
|
SDValue Op0 = N->getOperand(0);
|
|
if (Op0->getOpcode() != ISD::EXTRACT_SUBVECTOR &&
|
|
!(Op0->isMachineOpcode() &&
|
|
Op0->getMachineOpcode() == ARM64::EXTRACT_SUBREG))
|
|
return SDValue();
|
|
uint64_t idx = cast<ConstantSDNode>(Op0->getOperand(1))->getZExtValue();
|
|
if (Op0->getOpcode() == ISD::EXTRACT_SUBVECTOR) {
|
|
if (Op0->getValueType(0).getVectorNumElements() != idx && idx != 0)
|
|
return SDValue();
|
|
} else if (Op0->getMachineOpcode() == ARM64::EXTRACT_SUBREG) {
|
|
if (idx != ARM64::dsub)
|
|
return SDValue();
|
|
// The dsub reference is equivalent to a lane zero subvector reference.
|
|
idx = 0;
|
|
}
|
|
// Look through the bitcast of the input to the extract.
|
|
if (Op0->getOperand(0)->getOpcode() != ISD::BITCAST)
|
|
return SDValue();
|
|
SDValue Source = Op0->getOperand(0)->getOperand(0);
|
|
// If the source type has twice the number of elements as our destination
|
|
// type, we know this is an extract of the high or low half of the vector.
|
|
EVT SVT = Source->getValueType(0);
|
|
if (SVT.getVectorNumElements() != VT.getVectorNumElements() * 2)
|
|
return SDValue();
|
|
|
|
DEBUG(dbgs() << "arm64-lower: bitcast extract_subvector simplification\n");
|
|
|
|
// Create the simplified form to just extract the low or high half of the
|
|
// vector directly rather than bothering with the bitcasts.
|
|
SDLoc dl(N);
|
|
unsigned NumElements = VT.getVectorNumElements();
|
|
if (idx) {
|
|
SDValue HalfIdx = DAG.getConstant(NumElements, MVT::i64);
|
|
return DAG.getNode(ISD::EXTRACT_SUBVECTOR, dl, VT, Source, HalfIdx);
|
|
} else {
|
|
SDValue SubReg = DAG.getTargetConstant(ARM64::dsub, MVT::i32);
|
|
return SDValue(DAG.getMachineNode(TargetOpcode::EXTRACT_SUBREG, dl, VT,
|
|
Source, SubReg),
|
|
0);
|
|
}
|
|
}
|
|
|
|
static SDValue performConcatVectorsCombine(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG) {
|
|
// Wait 'til after everything is legalized to try this. That way we have
|
|
// legal vector types and such.
|
|
if (DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
|
|
SDLoc dl(N);
|
|
EVT VT = N->getValueType(0);
|
|
|
|
// If we see a (concat_vectors (v1x64 A), (v1x64 A)) it's really a vector
|
|
// splat. The indexed instructions are going to be expecting a DUPLANE64, so
|
|
// canonicalise to that.
|
|
if (N->getOperand(0) == N->getOperand(1) && VT.getVectorNumElements() == 2) {
|
|
assert(VT.getVectorElementType().getSizeInBits() == 64);
|
|
return DAG.getNode(ARM64ISD::DUPLANE64, dl, VT,
|
|
WidenVector(N->getOperand(0), DAG),
|
|
DAG.getConstant(0, MVT::i64));
|
|
}
|
|
|
|
// Canonicalise concat_vectors so that the right-hand vector has as few
|
|
// bit-casts as possible before its real operation. The primary matching
|
|
// destination for these operations will be the narrowing "2" instructions,
|
|
// which depend on the operation being performed on this right-hand vector.
|
|
// For example,
|
|
// (concat_vectors LHS, (v1i64 (bitconvert (v4i16 RHS))))
|
|
// becomes
|
|
// (bitconvert (concat_vectors (v4i16 (bitconvert LHS)), RHS))
|
|
|
|
SDValue Op1 = N->getOperand(1);
|
|
if (Op1->getOpcode() != ISD::BITCAST)
|
|
return SDValue();
|
|
SDValue RHS = Op1->getOperand(0);
|
|
MVT RHSTy = RHS.getValueType().getSimpleVT();
|
|
// If the RHS is not a vector, this is not the pattern we're looking for.
|
|
if (!RHSTy.isVector())
|
|
return SDValue();
|
|
|
|
DEBUG(dbgs() << "arm64-lower: concat_vectors bitcast simplification\n");
|
|
|
|
MVT ConcatTy = MVT::getVectorVT(RHSTy.getVectorElementType(),
|
|
RHSTy.getVectorNumElements() * 2);
|
|
return DAG.getNode(
|
|
ISD::BITCAST, dl, VT,
|
|
DAG.getNode(ISD::CONCAT_VECTORS, dl, ConcatTy,
|
|
DAG.getNode(ISD::BITCAST, dl, RHSTy, N->getOperand(0)), RHS));
|
|
}
|
|
|
|
static SDValue tryCombineFixedPointConvert(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG) {
|
|
// Wait 'til after everything is legalized to try this. That way we have
|
|
// legal vector types and such.
|
|
if (DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
// Transform a scalar conversion of a value from a lane extract into a
|
|
// lane extract of a vector conversion. E.g., from foo1 to foo2:
|
|
// double foo1(int64x2_t a) { return vcvtd_n_f64_s64(a[1], 9); }
|
|
// double foo2(int64x2_t a) { return vcvtq_n_f64_s64(a, 9)[1]; }
|
|
//
|
|
// The second form interacts better with instruction selection and the
|
|
// register allocator to avoid cross-class register copies that aren't
|
|
// coalescable due to a lane reference.
|
|
|
|
// Check the operand and see if it originates from a lane extract.
|
|
SDValue Op1 = N->getOperand(1);
|
|
if (Op1.getOpcode() == ISD::EXTRACT_VECTOR_ELT) {
|
|
// Yep, no additional predication needed. Perform the transform.
|
|
SDValue IID = N->getOperand(0);
|
|
SDValue Shift = N->getOperand(2);
|
|
SDValue Vec = Op1.getOperand(0);
|
|
SDValue Lane = Op1.getOperand(1);
|
|
EVT ResTy = N->getValueType(0);
|
|
EVT VecResTy;
|
|
SDLoc DL(N);
|
|
|
|
// The vector width should be 128 bits by the time we get here, even
|
|
// if it started as 64 bits (the extract_vector handling will have
|
|
// done so).
|
|
assert(Vec.getValueType().getSizeInBits() == 128 &&
|
|
"unexpected vector size on extract_vector_elt!");
|
|
if (Vec.getValueType() == MVT::v4i32)
|
|
VecResTy = MVT::v4f32;
|
|
else if (Vec.getValueType() == MVT::v2i64)
|
|
VecResTy = MVT::v2f64;
|
|
else
|
|
assert(0 && "unexpected vector type!");
|
|
|
|
SDValue Convert =
|
|
DAG.getNode(ISD::INTRINSIC_WO_CHAIN, DL, VecResTy, IID, Vec, Shift);
|
|
return DAG.getNode(ISD::EXTRACT_VECTOR_ELT, DL, ResTy, Convert, Lane);
|
|
}
|
|
return SDValue();
|
|
}
|
|
|
|
// AArch64 high-vector "long" operations are formed by performing the non-high
|
|
// version on an extract_subvector of each operand which gets the high half:
|
|
//
|
|
// (longop2 LHS, RHS) == (longop (extract_high LHS), (extract_high RHS))
|
|
//
|
|
// However, there are cases which don't have an extract_high explicitly, but
|
|
// have another operation that can be made compatible with one for free. For
|
|
// example:
|
|
//
|
|
// (dupv64 scalar) --> (extract_high (dup128 scalar))
|
|
//
|
|
// This routine does the actual conversion of such DUPs, once outer routines
|
|
// have determined that everything else is in order.
|
|
static SDValue tryExtendDUPToExtractHigh(SDValue N, SelectionDAG &DAG) {
|
|
// We can handle most types of duplicate, but the lane ones have an extra
|
|
// operand saying *which* lane, so we need to know.
|
|
bool IsDUPLANE;
|
|
switch (N.getOpcode()) {
|
|
case ARM64ISD::DUP:
|
|
IsDUPLANE = false;
|
|
break;
|
|
case ARM64ISD::DUPLANE8:
|
|
case ARM64ISD::DUPLANE16:
|
|
case ARM64ISD::DUPLANE32:
|
|
case ARM64ISD::DUPLANE64:
|
|
IsDUPLANE = true;
|
|
break;
|
|
default:
|
|
return SDValue();
|
|
}
|
|
|
|
MVT NarrowTy = N.getSimpleValueType();
|
|
if (!NarrowTy.is64BitVector())
|
|
return SDValue();
|
|
|
|
MVT ElementTy = NarrowTy.getVectorElementType();
|
|
unsigned NumElems = NarrowTy.getVectorNumElements();
|
|
MVT NewDUPVT = MVT::getVectorVT(ElementTy, NumElems * 2);
|
|
|
|
SDValue NewDUP;
|
|
if (IsDUPLANE)
|
|
NewDUP = DAG.getNode(N.getOpcode(), SDLoc(N), NewDUPVT, N.getOperand(0),
|
|
N.getOperand(1));
|
|
else
|
|
NewDUP = DAG.getNode(ARM64ISD::DUP, SDLoc(N), NewDUPVT, N.getOperand(0));
|
|
|
|
return DAG.getNode(ISD::EXTRACT_SUBVECTOR, SDLoc(N.getNode()), NarrowTy,
|
|
NewDUP, DAG.getConstant(NumElems, MVT::i64));
|
|
}
|
|
|
|
static bool isEssentiallyExtractSubvector(SDValue N) {
|
|
if (N.getOpcode() == ISD::EXTRACT_SUBVECTOR)
|
|
return true;
|
|
|
|
return N.getOpcode() == ISD::BITCAST &&
|
|
N.getOperand(0).getOpcode() == ISD::EXTRACT_SUBVECTOR;
|
|
}
|
|
|
|
/// \brief Helper structure to keep track of ISD::SET_CC operands.
|
|
struct GenericSetCCInfo {
|
|
const SDValue *Opnd0;
|
|
const SDValue *Opnd1;
|
|
ISD::CondCode CC;
|
|
};
|
|
|
|
/// \brief Helper structure to keep track of a SET_CC lowered into ARM64 code.
|
|
struct ARM64SetCCInfo {
|
|
const SDValue *Cmp;
|
|
ARM64CC::CondCode CC;
|
|
};
|
|
|
|
/// \brief Helper structure to keep track of SetCC information.
|
|
union SetCCInfo {
|
|
GenericSetCCInfo Generic;
|
|
ARM64SetCCInfo ARM64;
|
|
};
|
|
|
|
/// \brief Helper structure to be able to read SetCC information.
|
|
/// If set to true, IsARM64 field, Info is a ARM64SetCCInfo, otherwise Info is
|
|
/// a GenericSetCCInfo.
|
|
struct SetCCInfoAndKind {
|
|
SetCCInfo Info;
|
|
bool IsARM64;
|
|
};
|
|
|
|
/// \brief Check whether or not \p Op is a SET_CC operation, either a generic or
|
|
/// an
|
|
/// ARM64 lowered one.
|
|
/// \p SetCCInfo is filled accordingly.
|
|
/// \post SetCCInfo is meanginfull only when this function returns true.
|
|
/// \return True when Op is a kind of SET_CC operation.
|
|
static bool isSetCC(SDValue Op, SetCCInfoAndKind &SetCCInfo) {
|
|
// If this is a setcc, this is straight forward.
|
|
if (Op.getOpcode() == ISD::SETCC) {
|
|
SetCCInfo.Info.Generic.Opnd0 = &Op.getOperand(0);
|
|
SetCCInfo.Info.Generic.Opnd1 = &Op.getOperand(1);
|
|
SetCCInfo.Info.Generic.CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
|
|
SetCCInfo.IsARM64 = false;
|
|
return true;
|
|
}
|
|
// Otherwise, check if this is a matching csel instruction.
|
|
// In other words:
|
|
// - csel 1, 0, cc
|
|
// - csel 0, 1, !cc
|
|
if (Op.getOpcode() != ARM64ISD::CSEL)
|
|
return false;
|
|
// Set the information about the operands.
|
|
// TODO: we want the operands of the Cmp not the csel
|
|
SetCCInfo.Info.ARM64.Cmp = &Op.getOperand(3);
|
|
SetCCInfo.IsARM64 = true;
|
|
SetCCInfo.Info.ARM64.CC = static_cast<ARM64CC::CondCode>(
|
|
cast<ConstantSDNode>(Op.getOperand(2))->getZExtValue());
|
|
|
|
// Check that the operands matches the constraints:
|
|
// (1) Both operands must be constants.
|
|
// (2) One must be 1 and the other must be 0.
|
|
ConstantSDNode *TValue = dyn_cast<ConstantSDNode>(Op.getOperand(0));
|
|
ConstantSDNode *FValue = dyn_cast<ConstantSDNode>(Op.getOperand(1));
|
|
|
|
// Check (1).
|
|
if (!TValue || !FValue)
|
|
return false;
|
|
|
|
// Check (2).
|
|
if (!TValue->isOne()) {
|
|
// Update the comparison when we are interested in !cc.
|
|
std::swap(TValue, FValue);
|
|
SetCCInfo.Info.ARM64.CC =
|
|
ARM64CC::getInvertedCondCode(SetCCInfo.Info.ARM64.CC);
|
|
}
|
|
return TValue->isOne() && FValue->isNullValue();
|
|
}
|
|
|
|
// The folding we want to perform is:
|
|
// (add x, (setcc cc ...) )
|
|
// -->
|
|
// (csel x, (add x, 1), !cc ...)
|
|
//
|
|
// The latter will get matched to a CSINC instruction.
|
|
static SDValue performSetccAddFolding(SDNode *Op, SelectionDAG &DAG) {
|
|
assert(Op && Op->getOpcode() == ISD::ADD && "Unexpected operation!");
|
|
SDValue LHS = Op->getOperand(0);
|
|
SDValue RHS = Op->getOperand(1);
|
|
SetCCInfoAndKind InfoAndKind;
|
|
|
|
// If neither operand is a SET_CC, give up.
|
|
if (!isSetCC(LHS, InfoAndKind)) {
|
|
std::swap(LHS, RHS);
|
|
if (!isSetCC(LHS, InfoAndKind))
|
|
return SDValue();
|
|
}
|
|
|
|
// FIXME: This could be generatized to work for FP comparisons.
|
|
EVT CmpVT = InfoAndKind.IsARM64
|
|
? InfoAndKind.Info.ARM64.Cmp->getOperand(0).getValueType()
|
|
: InfoAndKind.Info.Generic.Opnd0->getValueType();
|
|
if (CmpVT != MVT::i32 && CmpVT != MVT::i64)
|
|
return SDValue();
|
|
|
|
SDValue CCVal;
|
|
SDValue Cmp;
|
|
SDLoc dl(Op);
|
|
if (InfoAndKind.IsARM64) {
|
|
CCVal = DAG.getConstant(
|
|
ARM64CC::getInvertedCondCode(InfoAndKind.Info.ARM64.CC), MVT::i32);
|
|
Cmp = *InfoAndKind.Info.ARM64.Cmp;
|
|
} else
|
|
Cmp = getARM64Cmp(*InfoAndKind.Info.Generic.Opnd0,
|
|
*InfoAndKind.Info.Generic.Opnd1,
|
|
ISD::getSetCCInverse(InfoAndKind.Info.Generic.CC, true),
|
|
CCVal, DAG, dl);
|
|
|
|
EVT VT = Op->getValueType(0);
|
|
LHS = DAG.getNode(ISD::ADD, dl, VT, RHS, DAG.getConstant(1, VT));
|
|
return DAG.getNode(ARM64ISD::CSEL, dl, VT, RHS, LHS, CCVal, Cmp);
|
|
}
|
|
|
|
// The basic add/sub long vector instructions have variants with "2" on the end
|
|
// which act on the high-half of their inputs. They are normally matched by
|
|
// patterns like:
|
|
//
|
|
// (add (zeroext (extract_high LHS)),
|
|
// (zeroext (extract_high RHS)))
|
|
// -> uaddl2 vD, vN, vM
|
|
//
|
|
// However, if one of the extracts is something like a duplicate, this
|
|
// instruction can still be used profitably. This function puts the DAG into a
|
|
// more appropriate form for those patterns to trigger.
|
|
static SDValue performAddSubLongCombine(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG) {
|
|
if (DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
|
|
MVT VT = N->getSimpleValueType(0);
|
|
if (!VT.is128BitVector()) {
|
|
if (N->getOpcode() == ISD::ADD)
|
|
return performSetccAddFolding(N, DAG);
|
|
return SDValue();
|
|
}
|
|
|
|
// Make sure both branches are extended in the same way.
|
|
SDValue LHS = N->getOperand(0);
|
|
SDValue RHS = N->getOperand(1);
|
|
if ((LHS.getOpcode() != ISD::ZERO_EXTEND &&
|
|
LHS.getOpcode() != ISD::SIGN_EXTEND) ||
|
|
LHS.getOpcode() != RHS.getOpcode())
|
|
return SDValue();
|
|
|
|
unsigned ExtType = LHS.getOpcode();
|
|
|
|
// It's not worth doing if at least one of the inputs isn't already an
|
|
// extract, but we don't know which it'll be so we have to try both.
|
|
if (isEssentiallyExtractSubvector(LHS.getOperand(0))) {
|
|
RHS = tryExtendDUPToExtractHigh(RHS.getOperand(0), DAG);
|
|
if (!RHS.getNode())
|
|
return SDValue();
|
|
|
|
RHS = DAG.getNode(ExtType, SDLoc(N), VT, RHS);
|
|
} else if (isEssentiallyExtractSubvector(RHS.getOperand(0))) {
|
|
LHS = tryExtendDUPToExtractHigh(LHS.getOperand(0), DAG);
|
|
if (!LHS.getNode())
|
|
return SDValue();
|
|
|
|
LHS = DAG.getNode(ExtType, SDLoc(N), VT, LHS);
|
|
}
|
|
|
|
return DAG.getNode(N->getOpcode(), SDLoc(N), VT, LHS, RHS);
|
|
}
|
|
|
|
// Massage DAGs which we can use the high-half "long" operations on into
|
|
// something isel will recognize better. E.g.
|
|
//
|
|
// (arm64_neon_umull (extract_high vec) (dupv64 scalar)) -->
|
|
// (arm64_neon_umull (extract_high (v2i64 vec)))
|
|
// (extract_high (v2i64 (dup128 scalar)))))
|
|
//
|
|
static SDValue tryCombineLongOpWithDup(unsigned IID, SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG) {
|
|
if (DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
|
|
SDValue LHS = N->getOperand(1);
|
|
SDValue RHS = N->getOperand(2);
|
|
assert(LHS.getValueType().is64BitVector() &&
|
|
RHS.getValueType().is64BitVector() &&
|
|
"unexpected shape for long operation");
|
|
|
|
// Either node could be a DUP, but it's not worth doing both of them (you'd
|
|
// just as well use the non-high version) so look for a corresponding extract
|
|
// operation on the other "wing".
|
|
if (isEssentiallyExtractSubvector(LHS)) {
|
|
RHS = tryExtendDUPToExtractHigh(RHS, DAG);
|
|
if (!RHS.getNode())
|
|
return SDValue();
|
|
} else if (isEssentiallyExtractSubvector(RHS)) {
|
|
LHS = tryExtendDUPToExtractHigh(LHS, DAG);
|
|
if (!LHS.getNode())
|
|
return SDValue();
|
|
}
|
|
|
|
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, SDLoc(N), N->getValueType(0),
|
|
N->getOperand(0), LHS, RHS);
|
|
}
|
|
|
|
static SDValue tryCombineShiftImm(unsigned IID, SDNode *N, SelectionDAG &DAG) {
|
|
MVT ElemTy = N->getSimpleValueType(0).getScalarType();
|
|
unsigned ElemBits = ElemTy.getSizeInBits();
|
|
|
|
int64_t ShiftAmount;
|
|
if (BuildVectorSDNode *BVN = dyn_cast<BuildVectorSDNode>(N->getOperand(2))) {
|
|
APInt SplatValue, SplatUndef;
|
|
unsigned SplatBitSize;
|
|
bool HasAnyUndefs;
|
|
if (!BVN->isConstantSplat(SplatValue, SplatUndef, SplatBitSize,
|
|
HasAnyUndefs, ElemBits) ||
|
|
SplatBitSize != ElemBits)
|
|
return SDValue();
|
|
|
|
ShiftAmount = SplatValue.getSExtValue();
|
|
} else if (ConstantSDNode *CVN = dyn_cast<ConstantSDNode>(N->getOperand(2))) {
|
|
ShiftAmount = CVN->getSExtValue();
|
|
} else
|
|
return SDValue();
|
|
|
|
unsigned Opcode;
|
|
bool IsRightShift;
|
|
switch (IID) {
|
|
default:
|
|
llvm_unreachable("Unknown shift intrinsic");
|
|
case Intrinsic::arm64_neon_sqshl:
|
|
Opcode = ARM64ISD::SQSHL_I;
|
|
IsRightShift = false;
|
|
break;
|
|
case Intrinsic::arm64_neon_uqshl:
|
|
Opcode = ARM64ISD::UQSHL_I;
|
|
IsRightShift = false;
|
|
break;
|
|
case Intrinsic::arm64_neon_srshl:
|
|
Opcode = ARM64ISD::SRSHR_I;
|
|
IsRightShift = true;
|
|
break;
|
|
case Intrinsic::arm64_neon_urshl:
|
|
Opcode = ARM64ISD::URSHR_I;
|
|
IsRightShift = true;
|
|
break;
|
|
case Intrinsic::arm64_neon_sqshlu:
|
|
Opcode = ARM64ISD::SQSHLU_I;
|
|
IsRightShift = false;
|
|
break;
|
|
}
|
|
|
|
if (IsRightShift && ShiftAmount <= -1 && ShiftAmount >= -(int)ElemBits)
|
|
return DAG.getNode(Opcode, SDLoc(N), N->getValueType(0), N->getOperand(1),
|
|
DAG.getConstant(-ShiftAmount, MVT::i32));
|
|
else if (!IsRightShift && ShiftAmount >= 0 && ShiftAmount <= ElemBits)
|
|
return DAG.getNode(Opcode, SDLoc(N), N->getValueType(0), N->getOperand(1),
|
|
DAG.getConstant(ShiftAmount, MVT::i32));
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
// The CRC32[BH] instructions ignore the high bits of their data operand. Since
|
|
// the intrinsics must be legal and take an i32, this means there's almost
|
|
// certainly going to be a zext in the DAG which we can eliminate.
|
|
static SDValue tryCombineCRC32(unsigned Mask, SDNode *N, SelectionDAG &DAG) {
|
|
SDValue AndN = N->getOperand(2);
|
|
if (AndN.getOpcode() != ISD::AND)
|
|
return SDValue();
|
|
|
|
ConstantSDNode *CMask = dyn_cast<ConstantSDNode>(AndN.getOperand(1));
|
|
if (!CMask || CMask->getZExtValue() != Mask)
|
|
return SDValue();
|
|
|
|
return DAG.getNode(ISD::INTRINSIC_WO_CHAIN, SDLoc(N), MVT::i32,
|
|
N->getOperand(0), N->getOperand(1), AndN.getOperand(0));
|
|
}
|
|
|
|
static SDValue performIntrinsicCombine(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
const ARM64Subtarget *Subtarget) {
|
|
SelectionDAG &DAG = DCI.DAG;
|
|
unsigned IID = getIntrinsicID(N);
|
|
switch (IID) {
|
|
default:
|
|
break;
|
|
case Intrinsic::arm64_neon_vcvtfxs2fp:
|
|
case Intrinsic::arm64_neon_vcvtfxu2fp:
|
|
return tryCombineFixedPointConvert(N, DCI, DAG);
|
|
break;
|
|
case Intrinsic::arm64_neon_fmax:
|
|
return DAG.getNode(ARM64ISD::FMAX, SDLoc(N), N->getValueType(0),
|
|
N->getOperand(1), N->getOperand(2));
|
|
case Intrinsic::arm64_neon_fmin:
|
|
return DAG.getNode(ARM64ISD::FMIN, SDLoc(N), N->getValueType(0),
|
|
N->getOperand(1), N->getOperand(2));
|
|
case Intrinsic::arm64_neon_smull:
|
|
case Intrinsic::arm64_neon_umull:
|
|
case Intrinsic::arm64_neon_pmull:
|
|
case Intrinsic::arm64_neon_sqdmull:
|
|
return tryCombineLongOpWithDup(IID, N, DCI, DAG);
|
|
case Intrinsic::arm64_neon_sqshl:
|
|
case Intrinsic::arm64_neon_uqshl:
|
|
case Intrinsic::arm64_neon_sqshlu:
|
|
case Intrinsic::arm64_neon_srshl:
|
|
case Intrinsic::arm64_neon_urshl:
|
|
return tryCombineShiftImm(IID, N, DAG);
|
|
case Intrinsic::arm64_crc32b:
|
|
case Intrinsic::arm64_crc32cb:
|
|
return tryCombineCRC32(0xff, N, DAG);
|
|
case Intrinsic::arm64_crc32h:
|
|
case Intrinsic::arm64_crc32ch:
|
|
return tryCombineCRC32(0xffff, N, DAG);
|
|
}
|
|
return SDValue();
|
|
}
|
|
|
|
static SDValue performExtendCombine(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG) {
|
|
// If we see something like (zext (sabd (extract_high ...), (DUP ...))) then
|
|
// we can convert that DUP into another extract_high (of a bigger DUP), which
|
|
// helps the backend to decide that an sabdl2 would be useful, saving a real
|
|
// extract_high operation.
|
|
if (!DCI.isBeforeLegalizeOps() && N->getOpcode() == ISD::ZERO_EXTEND &&
|
|
N->getOperand(0).getOpcode() == ISD::INTRINSIC_WO_CHAIN) {
|
|
SDNode *ABDNode = N->getOperand(0).getNode();
|
|
unsigned IID = getIntrinsicID(ABDNode);
|
|
if (IID == Intrinsic::arm64_neon_sabd ||
|
|
IID == Intrinsic::arm64_neon_uabd) {
|
|
SDValue NewABD = tryCombineLongOpWithDup(IID, ABDNode, DCI, DAG);
|
|
if (!NewABD.getNode())
|
|
return SDValue();
|
|
|
|
return DAG.getNode(ISD::ZERO_EXTEND, SDLoc(N), N->getValueType(0),
|
|
NewABD);
|
|
}
|
|
}
|
|
|
|
// This is effectively a custom type legalization for ARM64.
|
|
//
|
|
// Type legalization will split an extend of a small, legal, type to a larger
|
|
// illegal type by first splitting the destination type, often creating
|
|
// illegal source types, which then get legalized in isel-confusing ways,
|
|
// leading to really terrible codegen. E.g.,
|
|
// %result = v8i32 sext v8i8 %value
|
|
// becomes
|
|
// %losrc = extract_subreg %value, ...
|
|
// %hisrc = extract_subreg %value, ...
|
|
// %lo = v4i32 sext v4i8 %losrc
|
|
// %hi = v4i32 sext v4i8 %hisrc
|
|
// Things go rapidly downhill from there.
|
|
//
|
|
// For ARM64, the [sz]ext vector instructions can only go up one element
|
|
// size, so we can, e.g., extend from i8 to i16, but to go from i8 to i32
|
|
// take two instructions.
|
|
//
|
|
// This implies that the most efficient way to do the extend from v8i8
|
|
// to two v4i32 values is to first extend the v8i8 to v8i16, then do
|
|
// the normal splitting to happen for the v8i16->v8i32.
|
|
|
|
// This is pre-legalization to catch some cases where the default
|
|
// type legalization will create ill-tempered code.
|
|
if (!DCI.isBeforeLegalizeOps())
|
|
return SDValue();
|
|
|
|
// We're only interested in cleaning things up for non-legal vector types
|
|
// here. If both the source and destination are legal, things will just
|
|
// work naturally without any fiddling.
|
|
const TargetLowering &TLI = DAG.getTargetLoweringInfo();
|
|
EVT ResVT = N->getValueType(0);
|
|
if (!ResVT.isVector() || TLI.isTypeLegal(ResVT))
|
|
return SDValue();
|
|
// If the vector type isn't a simple VT, it's beyond the scope of what
|
|
// we're worried about here. Let legalization do its thing and hope for
|
|
// the best.
|
|
if (!ResVT.isSimple())
|
|
return SDValue();
|
|
|
|
SDValue Src = N->getOperand(0);
|
|
MVT SrcVT = Src->getValueType(0).getSimpleVT();
|
|
// If the source VT is a 64-bit vector, we can play games and get the
|
|
// better results we want.
|
|
if (SrcVT.getSizeInBits() != 64)
|
|
return SDValue();
|
|
|
|
unsigned SrcEltSize = SrcVT.getVectorElementType().getSizeInBits();
|
|
unsigned ElementCount = SrcVT.getVectorNumElements();
|
|
SrcVT = MVT::getVectorVT(MVT::getIntegerVT(SrcEltSize * 2), ElementCount);
|
|
SDLoc DL(N);
|
|
Src = DAG.getNode(N->getOpcode(), DL, SrcVT, Src);
|
|
|
|
// Now split the rest of the operation into two halves, each with a 64
|
|
// bit source.
|
|
EVT LoVT, HiVT;
|
|
SDValue Lo, Hi;
|
|
unsigned NumElements = ResVT.getVectorNumElements();
|
|
assert(!(NumElements & 1) && "Splitting vector, but not in half!");
|
|
LoVT = HiVT = EVT::getVectorVT(*DAG.getContext(),
|
|
ResVT.getVectorElementType(), NumElements / 2);
|
|
|
|
EVT InNVT = EVT::getVectorVT(*DAG.getContext(), SrcVT.getVectorElementType(),
|
|
LoVT.getVectorNumElements());
|
|
Lo = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InNVT, Src,
|
|
DAG.getIntPtrConstant(0));
|
|
Hi = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, InNVT, Src,
|
|
DAG.getIntPtrConstant(InNVT.getVectorNumElements()));
|
|
Lo = DAG.getNode(N->getOpcode(), DL, LoVT, Lo);
|
|
Hi = DAG.getNode(N->getOpcode(), DL, HiVT, Hi);
|
|
|
|
// Now combine the parts back together so we still have a single result
|
|
// like the combiner expects.
|
|
return DAG.getNode(ISD::CONCAT_VECTORS, DL, ResVT, Lo, Hi);
|
|
}
|
|
|
|
/// Replace a splat of a scalar to a vector store by scalar stores of the scalar
|
|
/// value. The load store optimizer pass will merge them to store pair stores.
|
|
/// This has better performance than a splat of the scalar followed by a split
|
|
/// vector store. Even if the stores are not merged it is four stores vs a dup,
|
|
/// followed by an ext.b and two stores.
|
|
static SDValue replaceSplatVectorStore(SelectionDAG &DAG, StoreSDNode *St) {
|
|
SDValue StVal = St->getValue();
|
|
EVT VT = StVal.getValueType();
|
|
|
|
// Don't replace floating point stores, they possibly won't be transformed to
|
|
// stp because of the store pair suppress pass.
|
|
if (VT.isFloatingPoint())
|
|
return SDValue();
|
|
|
|
// Check for insert vector elements.
|
|
if (StVal.getOpcode() != ISD::INSERT_VECTOR_ELT)
|
|
return SDValue();
|
|
|
|
// We can express a splat as store pair(s) for 2 or 4 elements.
|
|
unsigned NumVecElts = VT.getVectorNumElements();
|
|
if (NumVecElts != 4 && NumVecElts != 2)
|
|
return SDValue();
|
|
SDValue SplatVal = StVal.getOperand(1);
|
|
unsigned RemainInsertElts = NumVecElts - 1;
|
|
|
|
// Check that this is a splat.
|
|
while (--RemainInsertElts) {
|
|
SDValue NextInsertElt = StVal.getOperand(0);
|
|
if (NextInsertElt.getOpcode() != ISD::INSERT_VECTOR_ELT)
|
|
return SDValue();
|
|
if (NextInsertElt.getOperand(1) != SplatVal)
|
|
return SDValue();
|
|
StVal = NextInsertElt;
|
|
}
|
|
unsigned OrigAlignment = St->getAlignment();
|
|
unsigned EltOffset = NumVecElts == 4 ? 4 : 8;
|
|
unsigned Alignment = std::min(OrigAlignment, EltOffset);
|
|
|
|
// Create scalar stores. This is at least as good as the code sequence for a
|
|
// split unaligned store wich is a dup.s, ext.b, and two stores.
|
|
// Most of the time the three stores should be replaced by store pair
|
|
// instructions (stp).
|
|
SDLoc DL(St);
|
|
SDValue BasePtr = St->getBasePtr();
|
|
SDValue NewST1 =
|
|
DAG.getStore(St->getChain(), DL, SplatVal, BasePtr, St->getPointerInfo(),
|
|
St->isVolatile(), St->isNonTemporal(), St->getAlignment());
|
|
|
|
unsigned Offset = EltOffset;
|
|
while (--NumVecElts) {
|
|
SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i64, BasePtr,
|
|
DAG.getConstant(Offset, MVT::i64));
|
|
NewST1 = DAG.getStore(NewST1.getValue(0), DL, SplatVal, OffsetPtr,
|
|
St->getPointerInfo(), St->isVolatile(),
|
|
St->isNonTemporal(), Alignment);
|
|
Offset += EltOffset;
|
|
}
|
|
return NewST1;
|
|
}
|
|
|
|
static SDValue performSTORECombine(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG,
|
|
const ARM64Subtarget *Subtarget) {
|
|
if (!DCI.isBeforeLegalize())
|
|
return SDValue();
|
|
|
|
StoreSDNode *S = cast<StoreSDNode>(N);
|
|
if (S->isVolatile())
|
|
return SDValue();
|
|
|
|
// Cyclone has bad performance on unaligned 16B stores when crossing line and
|
|
// page boundries. We want to split such stores.
|
|
if (!Subtarget->isCyclone())
|
|
return SDValue();
|
|
|
|
// Don't split at Oz.
|
|
MachineFunction &MF = DAG.getMachineFunction();
|
|
bool IsMinSize = MF.getFunction()->getAttributes().hasAttribute(
|
|
AttributeSet::FunctionIndex, Attribute::MinSize);
|
|
if (IsMinSize)
|
|
return SDValue();
|
|
|
|
SDValue StVal = S->getValue();
|
|
EVT VT = StVal.getValueType();
|
|
|
|
// Don't split v2i64 vectors. Memcpy lowering produces those and splitting
|
|
// those up regresses performance on micro-benchmarks and olden/bh.
|
|
if (!VT.isVector() || VT.getVectorNumElements() < 2 || VT == MVT::v2i64)
|
|
return SDValue();
|
|
|
|
// Split unaligned 16B stores. They are terrible for performance.
|
|
// Don't split stores with alignment of 1 or 2. Code that uses clang vector
|
|
// extensions can use this to mark that it does not want splitting to happen
|
|
// (by underspecifying alignment to be 1 or 2). Furthermore, the chance of
|
|
// eliminating alignment hazards is only 1 in 8 for alignment of 2.
|
|
if (VT.getSizeInBits() != 128 || S->getAlignment() >= 16 ||
|
|
S->getAlignment() <= 2)
|
|
return SDValue();
|
|
|
|
// If we get a splat of a scalar convert this vector store to a store of
|
|
// scalars. They will be merged into store pairs thereby removing two
|
|
// instructions.
|
|
SDValue ReplacedSplat = replaceSplatVectorStore(DAG, S);
|
|
if (ReplacedSplat != SDValue())
|
|
return ReplacedSplat;
|
|
|
|
SDLoc DL(S);
|
|
unsigned NumElts = VT.getVectorNumElements() / 2;
|
|
// Split VT into two.
|
|
EVT HalfVT =
|
|
EVT::getVectorVT(*DAG.getContext(), VT.getVectorElementType(), NumElts);
|
|
SDValue SubVector0 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, HalfVT, StVal,
|
|
DAG.getIntPtrConstant(0));
|
|
SDValue SubVector1 = DAG.getNode(ISD::EXTRACT_SUBVECTOR, DL, HalfVT, StVal,
|
|
DAG.getIntPtrConstant(NumElts));
|
|
SDValue BasePtr = S->getBasePtr();
|
|
SDValue NewST1 =
|
|
DAG.getStore(S->getChain(), DL, SubVector0, BasePtr, S->getPointerInfo(),
|
|
S->isVolatile(), S->isNonTemporal(), S->getAlignment());
|
|
SDValue OffsetPtr = DAG.getNode(ISD::ADD, DL, MVT::i64, BasePtr,
|
|
DAG.getConstant(8, MVT::i64));
|
|
return DAG.getStore(NewST1.getValue(0), DL, SubVector1, OffsetPtr,
|
|
S->getPointerInfo(), S->isVolatile(), S->isNonTemporal(),
|
|
S->getAlignment());
|
|
}
|
|
|
|
// Optimize compare with zero and branch.
|
|
static SDValue performBRCONDCombine(SDNode *N,
|
|
TargetLowering::DAGCombinerInfo &DCI,
|
|
SelectionDAG &DAG) {
|
|
SDValue Chain = N->getOperand(0);
|
|
SDValue Dest = N->getOperand(1);
|
|
SDValue CCVal = N->getOperand(2);
|
|
SDValue Cmp = N->getOperand(3);
|
|
|
|
assert(isa<ConstantSDNode>(CCVal) && "Expected a ConstantSDNode here!");
|
|
unsigned CC = cast<ConstantSDNode>(CCVal)->getZExtValue();
|
|
if (CC != ARM64CC::EQ && CC != ARM64CC::NE)
|
|
return SDValue();
|
|
|
|
unsigned CmpOpc = Cmp.getOpcode();
|
|
if (CmpOpc != ARM64ISD::ADDS && CmpOpc != ARM64ISD::SUBS)
|
|
return SDValue();
|
|
|
|
// Only attempt folding if there is only one use of the flag and no use of the
|
|
// value.
|
|
if (!Cmp->hasNUsesOfValue(0, 0) || !Cmp->hasNUsesOfValue(1, 1))
|
|
return SDValue();
|
|
|
|
SDValue LHS = Cmp.getOperand(0);
|
|
SDValue RHS = Cmp.getOperand(1);
|
|
|
|
assert(LHS.getValueType() == RHS.getValueType() &&
|
|
"Expected the value type to be the same for both operands!");
|
|
if (LHS.getValueType() != MVT::i32 && LHS.getValueType() != MVT::i64)
|
|
return SDValue();
|
|
|
|
if (isa<ConstantSDNode>(LHS) && cast<ConstantSDNode>(LHS)->isNullValue())
|
|
std::swap(LHS, RHS);
|
|
|
|
if (!isa<ConstantSDNode>(RHS) || !cast<ConstantSDNode>(RHS)->isNullValue())
|
|
return SDValue();
|
|
|
|
if (LHS.getOpcode() == ISD::SHL || LHS.getOpcode() == ISD::SRA ||
|
|
LHS.getOpcode() == ISD::SRL)
|
|
return SDValue();
|
|
|
|
// Fold the compare into the branch instruction.
|
|
SDValue BR;
|
|
if (CC == ARM64CC::EQ)
|
|
BR = DAG.getNode(ARM64ISD::CBZ, SDLoc(N), MVT::Other, Chain, LHS, Dest);
|
|
else
|
|
BR = DAG.getNode(ARM64ISD::CBNZ, SDLoc(N), MVT::Other, Chain, LHS, Dest);
|
|
|
|
// Do not add new nodes to DAG combiner worklist.
|
|
DCI.CombineTo(N, BR, false);
|
|
|
|
return SDValue();
|
|
}
|
|
|
|
// vselect (v1i1 setcc) ->
|
|
// vselect (v1iXX setcc) (XX is the size of the compared operand type)
|
|
// FIXME: Currently the type legalizer can't handle VSELECT having v1i1 as
|
|
// condition. If it can legalize "VSELECT v1i1" correctly, no need to combine
|
|
// such VSELECT.
|
|
static SDValue performVSelectCombine(SDNode *N, SelectionDAG &DAG) {
|
|
SDValue N0 = N->getOperand(0);
|
|
EVT CCVT = N0.getValueType();
|
|
|
|
if (N0.getOpcode() != ISD::SETCC || CCVT.getVectorNumElements() != 1 ||
|
|
CCVT.getVectorElementType() != MVT::i1)
|
|
return SDValue();
|
|
|
|
EVT ResVT = N->getValueType(0);
|
|
EVT CmpVT = N0.getOperand(0).getValueType();
|
|
// Only combine when the result type is of the same size as the compared
|
|
// operands.
|
|
if (ResVT.getSizeInBits() != CmpVT.getSizeInBits())
|
|
return SDValue();
|
|
|
|
SDValue IfTrue = N->getOperand(1);
|
|
SDValue IfFalse = N->getOperand(2);
|
|
SDValue SetCC =
|
|
DAG.getSetCC(SDLoc(N), CmpVT.changeVectorElementTypeToInteger(),
|
|
N0.getOperand(0), N0.getOperand(1),
|
|
cast<CondCodeSDNode>(N0.getOperand(2))->get());
|
|
return DAG.getNode(ISD::VSELECT, SDLoc(N), ResVT, SetCC,
|
|
IfTrue, IfFalse);
|
|
}
|
|
|
|
SDValue ARM64TargetLowering::PerformDAGCombine(SDNode *N,
|
|
DAGCombinerInfo &DCI) const {
|
|
SelectionDAG &DAG = DCI.DAG;
|
|
switch (N->getOpcode()) {
|
|
default:
|
|
break;
|
|
case ISD::ADD:
|
|
case ISD::SUB:
|
|
return performAddSubLongCombine(N, DCI, DAG);
|
|
case ISD::XOR:
|
|
return performXorCombine(N, DAG, DCI, Subtarget);
|
|
case ISD::MUL:
|
|
return performMulCombine(N, DAG, DCI, Subtarget);
|
|
case ISD::SINT_TO_FP:
|
|
case ISD::UINT_TO_FP:
|
|
return performIntToFpCombine(N, DAG);
|
|
case ISD::OR:
|
|
return performORCombine(N, DCI, Subtarget);
|
|
case ISD::INTRINSIC_WO_CHAIN:
|
|
return performIntrinsicCombine(N, DCI, Subtarget);
|
|
case ISD::ANY_EXTEND:
|
|
case ISD::ZERO_EXTEND:
|
|
case ISD::SIGN_EXTEND:
|
|
return performExtendCombine(N, DCI, DAG);
|
|
case ISD::BITCAST:
|
|
return performBitcastCombine(N, DCI, DAG);
|
|
case ISD::CONCAT_VECTORS:
|
|
return performConcatVectorsCombine(N, DCI, DAG);
|
|
case ISD::VSELECT:
|
|
return performVSelectCombine(N, DCI.DAG);
|
|
case ISD::STORE:
|
|
return performSTORECombine(N, DCI, DAG, Subtarget);
|
|
case ARM64ISD::BRCOND:
|
|
return performBRCONDCombine(N, DCI, DAG);
|
|
}
|
|
return SDValue();
|
|
}
|
|
|
|
// Check if the return value is used as only a return value, as otherwise
|
|
// we can't perform a tail-call. In particular, we need to check for
|
|
// target ISD nodes that are returns and any other "odd" constructs
|
|
// that the generic analysis code won't necessarily catch.
|
|
bool ARM64TargetLowering::isUsedByReturnOnly(SDNode *N, SDValue &Chain) const {
|
|
if (N->getNumValues() != 1)
|
|
return false;
|
|
if (!N->hasNUsesOfValue(1, 0))
|
|
return false;
|
|
|
|
SDValue TCChain = Chain;
|
|
SDNode *Copy = *N->use_begin();
|
|
if (Copy->getOpcode() == ISD::CopyToReg) {
|
|
// If the copy has a glue operand, we conservatively assume it isn't safe to
|
|
// perform a tail call.
|
|
if (Copy->getOperand(Copy->getNumOperands() - 1).getValueType() ==
|
|
MVT::Glue)
|
|
return false;
|
|
TCChain = Copy->getOperand(0);
|
|
} else if (Copy->getOpcode() != ISD::FP_EXTEND)
|
|
return false;
|
|
|
|
bool HasRet = false;
|
|
for (SDNode *Node : Copy->uses()) {
|
|
if (Node->getOpcode() != ARM64ISD::RET_FLAG)
|
|
return false;
|
|
HasRet = true;
|
|
}
|
|
|
|
if (!HasRet)
|
|
return false;
|
|
|
|
Chain = TCChain;
|
|
return true;
|
|
}
|
|
|
|
// Return whether the an instruction can potentially be optimized to a tail
|
|
// call. This will cause the optimizers to attempt to move, or duplicate,
|
|
// return instructions to help enable tail call optimizations for this
|
|
// instruction.
|
|
bool ARM64TargetLowering::mayBeEmittedAsTailCall(CallInst *CI) const {
|
|
if (!EnableARM64TailCalls)
|
|
return false;
|
|
|
|
if (!CI->isTailCall())
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
bool ARM64TargetLowering::getIndexedAddressParts(SDNode *Op, SDValue &Base,
|
|
SDValue &Offset,
|
|
ISD::MemIndexedMode &AM,
|
|
bool &IsInc,
|
|
SelectionDAG &DAG) const {
|
|
if (Op->getOpcode() != ISD::ADD && Op->getOpcode() != ISD::SUB)
|
|
return false;
|
|
|
|
Base = Op->getOperand(0);
|
|
// All of the indexed addressing mode instructions take a signed
|
|
// 9 bit immediate offset.
|
|
if (ConstantSDNode *RHS = dyn_cast<ConstantSDNode>(Op->getOperand(1))) {
|
|
int64_t RHSC = (int64_t)RHS->getZExtValue();
|
|
if (RHSC >= 256 || RHSC <= -256)
|
|
return false;
|
|
IsInc = (Op->getOpcode() == ISD::ADD);
|
|
Offset = Op->getOperand(1);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool ARM64TargetLowering::getPreIndexedAddressParts(SDNode *N, SDValue &Base,
|
|
SDValue &Offset,
|
|
ISD::MemIndexedMode &AM,
|
|
SelectionDAG &DAG) const {
|
|
EVT VT;
|
|
SDValue Ptr;
|
|
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
|
|
VT = LD->getMemoryVT();
|
|
Ptr = LD->getBasePtr();
|
|
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
|
|
VT = ST->getMemoryVT();
|
|
Ptr = ST->getBasePtr();
|
|
} else
|
|
return false;
|
|
|
|
bool IsInc;
|
|
if (!getIndexedAddressParts(Ptr.getNode(), Base, Offset, AM, IsInc, DAG))
|
|
return false;
|
|
AM = IsInc ? ISD::PRE_INC : ISD::PRE_DEC;
|
|
return true;
|
|
}
|
|
|
|
bool ARM64TargetLowering::getPostIndexedAddressParts(SDNode *N, SDNode *Op,
|
|
SDValue &Base,
|
|
SDValue &Offset,
|
|
ISD::MemIndexedMode &AM,
|
|
SelectionDAG &DAG) const {
|
|
EVT VT;
|
|
SDValue Ptr;
|
|
if (LoadSDNode *LD = dyn_cast<LoadSDNode>(N)) {
|
|
VT = LD->getMemoryVT();
|
|
Ptr = LD->getBasePtr();
|
|
} else if (StoreSDNode *ST = dyn_cast<StoreSDNode>(N)) {
|
|
VT = ST->getMemoryVT();
|
|
Ptr = ST->getBasePtr();
|
|
} else
|
|
return false;
|
|
|
|
bool IsInc;
|
|
if (!getIndexedAddressParts(Op, Base, Offset, AM, IsInc, DAG))
|
|
return false;
|
|
// Post-indexing updates the base, so it's not a valid transform
|
|
// if that's not the same as the load's pointer.
|
|
if (Ptr != Base)
|
|
return false;
|
|
AM = IsInc ? ISD::POST_INC : ISD::POST_DEC;
|
|
return true;
|
|
}
|
|
|
|
void ARM64TargetLowering::ReplaceNodeResults(SDNode *N,
|
|
SmallVectorImpl<SDValue> &Results,
|
|
SelectionDAG &DAG) const {
|
|
switch (N->getOpcode()) {
|
|
default:
|
|
llvm_unreachable("Don't know how to custom expand this");
|
|
case ISD::FP_TO_UINT:
|
|
case ISD::FP_TO_SINT:
|
|
assert(N->getValueType(0) == MVT::i128 && "unexpected illegal conversion");
|
|
// Let normal code take care of it by not adding anything to Results.
|
|
return;
|
|
}
|
|
}
|
|
|
|
bool ARM64TargetLowering::shouldExpandAtomicInIR(Instruction *Inst) const {
|
|
// Loads and stores less than 128-bits are already atomic; ones above that
|
|
// are doomed anyway, so defer to the default libcall and blame the OS when
|
|
// things go wrong:
|
|
if (StoreInst *SI = dyn_cast<StoreInst>(Inst))
|
|
return SI->getValueOperand()->getType()->getPrimitiveSizeInBits() == 128;
|
|
else if (LoadInst *LI = dyn_cast<LoadInst>(Inst))
|
|
return LI->getType()->getPrimitiveSizeInBits() == 128;
|
|
|
|
// For the real atomic operations, we have ldxr/stxr up to 128 bits.
|
|
return Inst->getType()->getPrimitiveSizeInBits() <= 128;
|
|
}
|
|
|
|
Value *ARM64TargetLowering::emitLoadLinked(IRBuilder<> &Builder, Value *Addr,
|
|
AtomicOrdering Ord) const {
|
|
Module *M = Builder.GetInsertBlock()->getParent()->getParent();
|
|
Type *ValTy = cast<PointerType>(Addr->getType())->getElementType();
|
|
bool IsAcquire =
|
|
Ord == Acquire || Ord == AcquireRelease || Ord == SequentiallyConsistent;
|
|
|
|
// Since i128 isn't legal and intrinsics don't get type-lowered, the ldrexd
|
|
// intrinsic must return {i64, i64} and we have to recombine them into a
|
|
// single i128 here.
|
|
if (ValTy->getPrimitiveSizeInBits() == 128) {
|
|
Intrinsic::ID Int =
|
|
IsAcquire ? Intrinsic::arm64_ldaxp : Intrinsic::arm64_ldxp;
|
|
Function *Ldxr = llvm::Intrinsic::getDeclaration(M, Int);
|
|
|
|
Addr = Builder.CreateBitCast(Addr, Type::getInt8PtrTy(M->getContext()));
|
|
Value *LoHi = Builder.CreateCall(Ldxr, Addr, "lohi");
|
|
|
|
Value *Lo = Builder.CreateExtractValue(LoHi, 0, "lo");
|
|
Value *Hi = Builder.CreateExtractValue(LoHi, 1, "hi");
|
|
Lo = Builder.CreateZExt(Lo, ValTy, "lo64");
|
|
Hi = Builder.CreateZExt(Hi, ValTy, "hi64");
|
|
return Builder.CreateOr(
|
|
Lo, Builder.CreateShl(Hi, ConstantInt::get(ValTy, 64)), "val64");
|
|
}
|
|
|
|
Type *Tys[] = { Addr->getType() };
|
|
Intrinsic::ID Int =
|
|
IsAcquire ? Intrinsic::arm64_ldaxr : Intrinsic::arm64_ldxr;
|
|
Function *Ldxr = llvm::Intrinsic::getDeclaration(M, Int, Tys);
|
|
|
|
return Builder.CreateTruncOrBitCast(
|
|
Builder.CreateCall(Ldxr, Addr),
|
|
cast<PointerType>(Addr->getType())->getElementType());
|
|
}
|
|
|
|
Value *ARM64TargetLowering::emitStoreConditional(IRBuilder<> &Builder,
|
|
Value *Val, Value *Addr,
|
|
AtomicOrdering Ord) const {
|
|
Module *M = Builder.GetInsertBlock()->getParent()->getParent();
|
|
bool IsRelease =
|
|
Ord == Release || Ord == AcquireRelease || Ord == SequentiallyConsistent;
|
|
|
|
// Since the intrinsics must have legal type, the i128 intrinsics take two
|
|
// parameters: "i64, i64". We must marshal Val into the appropriate form
|
|
// before the call.
|
|
if (Val->getType()->getPrimitiveSizeInBits() == 128) {
|
|
Intrinsic::ID Int =
|
|
IsRelease ? Intrinsic::arm64_stlxp : Intrinsic::arm64_stxp;
|
|
Function *Stxr = Intrinsic::getDeclaration(M, Int);
|
|
Type *Int64Ty = Type::getInt64Ty(M->getContext());
|
|
|
|
Value *Lo = Builder.CreateTrunc(Val, Int64Ty, "lo");
|
|
Value *Hi = Builder.CreateTrunc(Builder.CreateLShr(Val, 64), Int64Ty, "hi");
|
|
Addr = Builder.CreateBitCast(Addr, Type::getInt8PtrTy(M->getContext()));
|
|
return Builder.CreateCall3(Stxr, Lo, Hi, Addr);
|
|
}
|
|
|
|
Intrinsic::ID Int =
|
|
IsRelease ? Intrinsic::arm64_stlxr : Intrinsic::arm64_stxr;
|
|
Type *Tys[] = { Addr->getType() };
|
|
Function *Stxr = Intrinsic::getDeclaration(M, Int, Tys);
|
|
|
|
return Builder.CreateCall2(
|
|
Stxr, Builder.CreateZExtOrBitCast(
|
|
Val, Stxr->getFunctionType()->getParamType(0)),
|
|
Addr);
|
|
}
|