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Update all callers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@228930 91177308-0d34-0410-b5e6-96231b3b80d8
4246 lines
155 KiB
C++
4246 lines
155 KiB
C++
//===-- PPCISelDAGToDAG.cpp - PPC --pattern matching inst selector --------===//
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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 defines a pattern matching instruction selector for PowerPC,
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// converting from a legalized dag to a PPC dag.
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//
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//===----------------------------------------------------------------------===//
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#include "PPC.h"
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#include "MCTargetDesc/PPCPredicates.h"
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#include "PPCMachineFunctionInfo.h"
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#include "PPCTargetMachine.h"
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#include "llvm/CodeGen/MachineFunction.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/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/IR/Constants.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/GlobalAlias.h"
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#include "llvm/IR/GlobalValue.h"
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#include "llvm/IR/GlobalVariable.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Module.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/MathExtras.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 "ppc-codegen"
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// FIXME: Remove this once the bug has been fixed!
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cl::opt<bool> ANDIGlueBug("expose-ppc-andi-glue-bug",
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cl::desc("expose the ANDI glue bug on PPC"), cl::Hidden);
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static cl::opt<bool>
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UseBitPermRewriter("ppc-use-bit-perm-rewriter", cl::init(true),
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cl::desc("use aggressive ppc isel for bit permutations"),
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cl::Hidden);
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static cl::opt<bool> BPermRewriterNoMasking(
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"ppc-bit-perm-rewriter-stress-rotates",
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cl::desc("stress rotate selection in aggressive ppc isel for "
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"bit permutations"),
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cl::Hidden);
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namespace llvm {
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void initializePPCDAGToDAGISelPass(PassRegistry&);
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}
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namespace {
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//===--------------------------------------------------------------------===//
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/// PPCDAGToDAGISel - PPC specific code to select PPC machine
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/// instructions for SelectionDAG operations.
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///
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class PPCDAGToDAGISel : public SelectionDAGISel {
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const PPCTargetMachine &TM;
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const PPCSubtarget *PPCSubTarget;
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const PPCTargetLowering *PPCLowering;
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unsigned GlobalBaseReg;
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public:
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explicit PPCDAGToDAGISel(PPCTargetMachine &tm)
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: SelectionDAGISel(tm), TM(tm) {
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initializePPCDAGToDAGISelPass(*PassRegistry::getPassRegistry());
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}
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bool runOnMachineFunction(MachineFunction &MF) override {
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// Make sure we re-emit a set of the global base reg if necessary
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GlobalBaseReg = 0;
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PPCSubTarget = &MF.getSubtarget<PPCSubtarget>();
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PPCLowering = PPCSubTarget->getTargetLowering();
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SelectionDAGISel::runOnMachineFunction(MF);
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if (!PPCSubTarget->isSVR4ABI())
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InsertVRSaveCode(MF);
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return true;
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}
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void PreprocessISelDAG() override;
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void PostprocessISelDAG() override;
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/// getI32Imm - Return a target constant with the specified value, of type
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/// i32.
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inline SDValue getI32Imm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i32);
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}
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/// getI64Imm - Return a target constant with the specified value, of type
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/// i64.
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inline SDValue getI64Imm(uint64_t Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i64);
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}
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/// getSmallIPtrImm - Return a target constant of pointer type.
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inline SDValue getSmallIPtrImm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, PPCLowering->getPointerTy());
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}
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/// isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s
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/// with any number of 0s on either side. The 1s are allowed to wrap from
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/// LSB to MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs.
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/// 0x0F0F0000 is not, since all 1s are not contiguous.
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static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME);
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/// isRotateAndMask - Returns true if Mask and Shift can be folded into a
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/// rotate and mask opcode and mask operation.
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static bool isRotateAndMask(SDNode *N, unsigned Mask, bool isShiftMask,
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unsigned &SH, unsigned &MB, unsigned &ME);
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/// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC
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/// base register. Return the virtual register that holds this value.
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SDNode *getGlobalBaseReg();
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SDNode *getFrameIndex(SDNode *SN, SDNode *N, unsigned Offset = 0);
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// Select - Convert the specified operand from a target-independent to a
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// target-specific node if it hasn't already been changed.
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SDNode *Select(SDNode *N) override;
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SDNode *SelectBitfieldInsert(SDNode *N);
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SDNode *SelectBitPermutation(SDNode *N);
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/// SelectCC - Select a comparison of the specified values with the
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/// specified condition code, returning the CR# of the expression.
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SDValue SelectCC(SDValue LHS, SDValue RHS, ISD::CondCode CC, SDLoc dl);
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/// SelectAddrImm - Returns true if the address N can be represented by
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/// a base register plus a signed 16-bit displacement [r+imm].
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bool SelectAddrImm(SDValue N, SDValue &Disp,
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SDValue &Base) {
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return PPCLowering->SelectAddressRegImm(N, Disp, Base, *CurDAG, false);
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}
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/// SelectAddrImmOffs - Return true if the operand is valid for a preinc
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/// immediate field. Note that the operand at this point is already the
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/// result of a prior SelectAddressRegImm call.
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bool SelectAddrImmOffs(SDValue N, SDValue &Out) const {
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if (N.getOpcode() == ISD::TargetConstant ||
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N.getOpcode() == ISD::TargetGlobalAddress) {
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Out = N;
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return true;
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}
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return false;
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}
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/// SelectAddrIdx - Given the specified addressed, check to see if it can be
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/// represented as an indexed [r+r] operation. Returns false if it can
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/// be represented by [r+imm], which are preferred.
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bool SelectAddrIdx(SDValue N, SDValue &Base, SDValue &Index) {
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return PPCLowering->SelectAddressRegReg(N, Base, Index, *CurDAG);
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}
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/// SelectAddrIdxOnly - Given the specified addressed, force it to be
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/// represented as an indexed [r+r] operation.
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bool SelectAddrIdxOnly(SDValue N, SDValue &Base, SDValue &Index) {
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return PPCLowering->SelectAddressRegRegOnly(N, Base, Index, *CurDAG);
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}
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/// SelectAddrImmX4 - Returns true if the address N can be represented by
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/// a base register plus a signed 16-bit displacement that is a multiple of 4.
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/// Suitable for use by STD and friends.
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bool SelectAddrImmX4(SDValue N, SDValue &Disp, SDValue &Base) {
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return PPCLowering->SelectAddressRegImm(N, Disp, Base, *CurDAG, true);
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}
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// Select an address into a single register.
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bool SelectAddr(SDValue N, SDValue &Base) {
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Base = N;
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return true;
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}
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/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
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/// inline asm expressions. It is always correct to compute the value into
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/// a register. The case of adding a (possibly relocatable) constant to a
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/// register can be improved, but it is wrong to substitute Reg+Reg for
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/// Reg in an asm, because the load or store opcode would have to change.
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bool SelectInlineAsmMemoryOperand(const SDValue &Op,
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char ConstraintCode,
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std::vector<SDValue> &OutOps) override {
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// We need to make sure that this one operand does not end up in r0
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// (because we might end up lowering this as 0(%op)).
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const TargetRegisterInfo *TRI = PPCSubTarget->getRegisterInfo();
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const TargetRegisterClass *TRC = TRI->getPointerRegClass(*MF, /*Kind=*/1);
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SDValue RC = CurDAG->getTargetConstant(TRC->getID(), MVT::i32);
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SDValue NewOp =
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SDValue(CurDAG->getMachineNode(TargetOpcode::COPY_TO_REGCLASS,
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SDLoc(Op), Op.getValueType(),
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Op, RC), 0);
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OutOps.push_back(NewOp);
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return false;
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}
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void InsertVRSaveCode(MachineFunction &MF);
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const char *getPassName() const override {
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return "PowerPC DAG->DAG Pattern Instruction Selection";
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}
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// Include the pieces autogenerated from the target description.
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#include "PPCGenDAGISel.inc"
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private:
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SDNode *SelectSETCC(SDNode *N);
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void PeepholePPC64();
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void PeepholePPC64ZExt();
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void PeepholeCROps();
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SDValue combineToCMPB(SDNode *N);
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void foldBoolExts(SDValue &Res, SDNode *&N);
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bool AllUsersSelectZero(SDNode *N);
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void SwapAllSelectUsers(SDNode *N);
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};
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}
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/// InsertVRSaveCode - Once the entire function has been instruction selected,
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/// all virtual registers are created and all machine instructions are built,
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/// check to see if we need to save/restore VRSAVE. If so, do it.
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void PPCDAGToDAGISel::InsertVRSaveCode(MachineFunction &Fn) {
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// Check to see if this function uses vector registers, which means we have to
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// save and restore the VRSAVE register and update it with the regs we use.
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//
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// In this case, there will be virtual registers of vector type created
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// by the scheduler. Detect them now.
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bool HasVectorVReg = false;
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for (unsigned i = 0, e = RegInfo->getNumVirtRegs(); i != e; ++i) {
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unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
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if (RegInfo->getRegClass(Reg) == &PPC::VRRCRegClass) {
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HasVectorVReg = true;
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break;
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}
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}
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if (!HasVectorVReg) return; // nothing to do.
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// If we have a vector register, we want to emit code into the entry and exit
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// blocks to save and restore the VRSAVE register. We do this here (instead
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// of marking all vector instructions as clobbering VRSAVE) for two reasons:
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//
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// 1. This (trivially) reduces the load on the register allocator, by not
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// having to represent the live range of the VRSAVE register.
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// 2. This (more significantly) allows us to create a temporary virtual
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// register to hold the saved VRSAVE value, allowing this temporary to be
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// register allocated, instead of forcing it to be spilled to the stack.
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// Create two vregs - one to hold the VRSAVE register that is live-in to the
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// function and one for the value after having bits or'd into it.
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unsigned InVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
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unsigned UpdatedVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
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const TargetInstrInfo &TII = *PPCSubTarget->getInstrInfo();
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MachineBasicBlock &EntryBB = *Fn.begin();
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DebugLoc dl;
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// Emit the following code into the entry block:
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// InVRSAVE = MFVRSAVE
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// UpdatedVRSAVE = UPDATE_VRSAVE InVRSAVE
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// MTVRSAVE UpdatedVRSAVE
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MachineBasicBlock::iterator IP = EntryBB.begin(); // Insert Point
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BuildMI(EntryBB, IP, dl, TII.get(PPC::MFVRSAVE), InVRSAVE);
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BuildMI(EntryBB, IP, dl, TII.get(PPC::UPDATE_VRSAVE),
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UpdatedVRSAVE).addReg(InVRSAVE);
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BuildMI(EntryBB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(UpdatedVRSAVE);
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// Find all return blocks, outputting a restore in each epilog.
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for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
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if (!BB->empty() && BB->back().isReturn()) {
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IP = BB->end(); --IP;
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// Skip over all terminator instructions, which are part of the return
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// sequence.
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MachineBasicBlock::iterator I2 = IP;
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while (I2 != BB->begin() && (--I2)->isTerminator())
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IP = I2;
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// Emit: MTVRSAVE InVRSave
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BuildMI(*BB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(InVRSAVE);
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}
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}
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}
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/// getGlobalBaseReg - Output the instructions required to put the
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/// base address to use for accessing globals into a register.
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///
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SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
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if (!GlobalBaseReg) {
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const TargetInstrInfo &TII = *PPCSubTarget->getInstrInfo();
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// Insert the set of GlobalBaseReg into the first MBB of the function
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MachineBasicBlock &FirstMBB = MF->front();
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MachineBasicBlock::iterator MBBI = FirstMBB.begin();
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const Module *M = MF->getFunction()->getParent();
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DebugLoc dl;
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if (PPCLowering->getPointerTy() == MVT::i32) {
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if (PPCSubTarget->isTargetELF()) {
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GlobalBaseReg = PPC::R30;
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if (M->getPICLevel() == PICLevel::Small) {
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MoveGOTtoLR));
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
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MF->getInfo<PPCFunctionInfo>()->setUsesPICBase(true);
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} else {
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR));
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
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unsigned TempReg = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
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BuildMI(FirstMBB, MBBI, dl,
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TII.get(PPC::UpdateGBR)).addReg(GlobalBaseReg)
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.addReg(TempReg, RegState::Define).addReg(GlobalBaseReg);
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MF->getInfo<PPCFunctionInfo>()->setUsesPICBase(true);
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}
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} else {
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GlobalBaseReg =
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RegInfo->createVirtualRegister(&PPC::GPRC_NOR0RegClass);
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR));
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
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}
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} else {
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GlobalBaseReg = RegInfo->createVirtualRegister(&PPC::G8RC_NOX0RegClass);
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR8));
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR8), GlobalBaseReg);
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}
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}
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return CurDAG->getRegister(GlobalBaseReg,
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PPCLowering->getPointerTy()).getNode();
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}
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/// isIntS16Immediate - This method tests to see if the node is either a 32-bit
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/// or 64-bit immediate, and if the value can be accurately represented as a
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/// sign extension from a 16-bit value. If so, this returns true and the
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/// immediate.
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static bool isIntS16Immediate(SDNode *N, short &Imm) {
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if (N->getOpcode() != ISD::Constant)
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return false;
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Imm = (short)cast<ConstantSDNode>(N)->getZExtValue();
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if (N->getValueType(0) == MVT::i32)
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return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
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else
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return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
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}
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static bool isIntS16Immediate(SDValue Op, short &Imm) {
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return isIntS16Immediate(Op.getNode(), Imm);
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}
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/// isInt32Immediate - This method tests to see if the node is a 32-bit constant
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/// operand. If so Imm will receive the 32-bit value.
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static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
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if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
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Imm = cast<ConstantSDNode>(N)->getZExtValue();
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return true;
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}
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return false;
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}
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/// isInt64Immediate - This method tests to see if the node is a 64-bit constant
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/// operand. If so Imm will receive the 64-bit value.
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static bool isInt64Immediate(SDNode *N, uint64_t &Imm) {
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if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) {
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Imm = cast<ConstantSDNode>(N)->getZExtValue();
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return true;
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}
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return false;
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}
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// isInt32Immediate - This method tests to see if a constant operand.
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// If so Imm will receive the 32 bit value.
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static bool isInt32Immediate(SDValue N, unsigned &Imm) {
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return isInt32Immediate(N.getNode(), Imm);
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}
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// isOpcWithIntImmediate - This method tests to see if the node is a specific
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// opcode and that it has a immediate integer right operand.
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// If so Imm will receive the 32 bit value.
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static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
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return N->getOpcode() == Opc
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&& isInt32Immediate(N->getOperand(1).getNode(), Imm);
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}
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SDNode *PPCDAGToDAGISel::getFrameIndex(SDNode *SN, SDNode *N, unsigned Offset) {
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SDLoc dl(SN);
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int FI = cast<FrameIndexSDNode>(N)->getIndex();
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SDValue TFI = CurDAG->getTargetFrameIndex(FI, N->getValueType(0));
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unsigned Opc = N->getValueType(0) == MVT::i32 ? PPC::ADDI : PPC::ADDI8;
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if (SN->hasOneUse())
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return CurDAG->SelectNodeTo(SN, Opc, N->getValueType(0), TFI,
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getSmallIPtrImm(Offset));
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return CurDAG->getMachineNode(Opc, dl, N->getValueType(0), TFI,
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getSmallIPtrImm(Offset));
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}
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bool PPCDAGToDAGISel::isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
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if (!Val)
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return false;
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if (isShiftedMask_32(Val)) {
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// look for the first non-zero bit
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MB = countLeadingZeros(Val);
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// look for the first zero bit after the run of ones
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ME = countLeadingZeros((Val - 1) ^ Val);
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return true;
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} else {
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Val = ~Val; // invert mask
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if (isShiftedMask_32(Val)) {
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// effectively look for the first zero bit
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ME = countLeadingZeros(Val) - 1;
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// effectively look for the first one bit after the run of zeros
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MB = countLeadingZeros((Val - 1) ^ Val) + 1;
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return true;
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}
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}
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// no run present
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return false;
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}
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bool PPCDAGToDAGISel::isRotateAndMask(SDNode *N, unsigned Mask,
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bool isShiftMask, unsigned &SH,
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unsigned &MB, unsigned &ME) {
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// Don't even go down this path for i64, since different logic will be
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// necessary for rldicl/rldicr/rldimi.
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if (N->getValueType(0) != MVT::i32)
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return false;
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unsigned Shift = 32;
|
|
unsigned Indeterminant = ~0; // bit mask marking indeterminant results
|
|
unsigned Opcode = N->getOpcode();
|
|
if (N->getNumOperands() != 2 ||
|
|
!isInt32Immediate(N->getOperand(1).getNode(), Shift) || (Shift > 31))
|
|
return false;
|
|
|
|
if (Opcode == ISD::SHL) {
|
|
// apply shift left to mask if it comes first
|
|
if (isShiftMask) Mask = Mask << Shift;
|
|
// determine which bits are made indeterminant by shift
|
|
Indeterminant = ~(0xFFFFFFFFu << Shift);
|
|
} else if (Opcode == ISD::SRL) {
|
|
// apply shift right to mask if it comes first
|
|
if (isShiftMask) Mask = Mask >> Shift;
|
|
// determine which bits are made indeterminant by shift
|
|
Indeterminant = ~(0xFFFFFFFFu >> Shift);
|
|
// adjust for the left rotate
|
|
Shift = 32 - Shift;
|
|
} else if (Opcode == ISD::ROTL) {
|
|
Indeterminant = 0;
|
|
} else {
|
|
return false;
|
|
}
|
|
|
|
// if the mask doesn't intersect any Indeterminant bits
|
|
if (Mask && !(Mask & Indeterminant)) {
|
|
SH = Shift & 31;
|
|
// make sure the mask is still a mask (wrap arounds may not be)
|
|
return isRunOfOnes(Mask, MB, ME);
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/// SelectBitfieldInsert - turn an or of two masked values into
|
|
/// the rotate left word immediate then mask insert (rlwimi) instruction.
|
|
SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
|
|
SDValue Op0 = N->getOperand(0);
|
|
SDValue Op1 = N->getOperand(1);
|
|
SDLoc dl(N);
|
|
|
|
APInt LKZ, LKO, RKZ, RKO;
|
|
CurDAG->computeKnownBits(Op0, LKZ, LKO);
|
|
CurDAG->computeKnownBits(Op1, RKZ, RKO);
|
|
|
|
unsigned TargetMask = LKZ.getZExtValue();
|
|
unsigned InsertMask = RKZ.getZExtValue();
|
|
|
|
if ((TargetMask | InsertMask) == 0xFFFFFFFF) {
|
|
unsigned Op0Opc = Op0.getOpcode();
|
|
unsigned Op1Opc = Op1.getOpcode();
|
|
unsigned Value, SH = 0;
|
|
TargetMask = ~TargetMask;
|
|
InsertMask = ~InsertMask;
|
|
|
|
// If the LHS has a foldable shift and the RHS does not, then swap it to the
|
|
// RHS so that we can fold the shift into the insert.
|
|
if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
|
|
if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
|
|
Op0.getOperand(0).getOpcode() == ISD::SRL) {
|
|
if (Op1.getOperand(0).getOpcode() != ISD::SHL &&
|
|
Op1.getOperand(0).getOpcode() != ISD::SRL) {
|
|
std::swap(Op0, Op1);
|
|
std::swap(Op0Opc, Op1Opc);
|
|
std::swap(TargetMask, InsertMask);
|
|
}
|
|
}
|
|
} else if (Op0Opc == ISD::SHL || Op0Opc == ISD::SRL) {
|
|
if (Op1Opc == ISD::AND && Op1.getOperand(0).getOpcode() != ISD::SHL &&
|
|
Op1.getOperand(0).getOpcode() != ISD::SRL) {
|
|
std::swap(Op0, Op1);
|
|
std::swap(Op0Opc, Op1Opc);
|
|
std::swap(TargetMask, InsertMask);
|
|
}
|
|
}
|
|
|
|
unsigned MB, ME;
|
|
if (isRunOfOnes(InsertMask, MB, ME)) {
|
|
SDValue Tmp1, Tmp2;
|
|
|
|
if ((Op1Opc == ISD::SHL || Op1Opc == ISD::SRL) &&
|
|
isInt32Immediate(Op1.getOperand(1), Value)) {
|
|
Op1 = Op1.getOperand(0);
|
|
SH = (Op1Opc == ISD::SHL) ? Value : 32 - Value;
|
|
}
|
|
if (Op1Opc == ISD::AND) {
|
|
// The AND mask might not be a constant, and we need to make sure that
|
|
// if we're going to fold the masking with the insert, all bits not
|
|
// know to be zero in the mask are known to be one.
|
|
APInt MKZ, MKO;
|
|
CurDAG->computeKnownBits(Op1.getOperand(1), MKZ, MKO);
|
|
bool CanFoldMask = InsertMask == MKO.getZExtValue();
|
|
|
|
unsigned SHOpc = Op1.getOperand(0).getOpcode();
|
|
if ((SHOpc == ISD::SHL || SHOpc == ISD::SRL) && CanFoldMask &&
|
|
isInt32Immediate(Op1.getOperand(0).getOperand(1), Value)) {
|
|
// Note that Value must be in range here (less than 32) because
|
|
// otherwise there would not be any bits set in InsertMask.
|
|
Op1 = Op1.getOperand(0).getOperand(0);
|
|
SH = (SHOpc == ISD::SHL) ? Value : 32 - Value;
|
|
}
|
|
}
|
|
|
|
SH &= 31;
|
|
SDValue Ops[] = { Op0, Op1, getI32Imm(SH), getI32Imm(MB),
|
|
getI32Imm(ME) };
|
|
return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops);
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
|
|
// Predict the number of instructions that would be generated by calling
|
|
// SelectInt64(N).
|
|
static unsigned SelectInt64CountDirect(int64_t Imm) {
|
|
// Assume no remaining bits.
|
|
unsigned Remainder = 0;
|
|
// Assume no shift required.
|
|
unsigned Shift = 0;
|
|
|
|
// If it can't be represented as a 32 bit value.
|
|
if (!isInt<32>(Imm)) {
|
|
Shift = countTrailingZeros<uint64_t>(Imm);
|
|
int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
|
|
|
|
// If the shifted value fits 32 bits.
|
|
if (isInt<32>(ImmSh)) {
|
|
// Go with the shifted value.
|
|
Imm = ImmSh;
|
|
} else {
|
|
// Still stuck with a 64 bit value.
|
|
Remainder = Imm;
|
|
Shift = 32;
|
|
Imm >>= 32;
|
|
}
|
|
}
|
|
|
|
// Intermediate operand.
|
|
unsigned Result = 0;
|
|
|
|
// Handle first 32 bits.
|
|
unsigned Lo = Imm & 0xFFFF;
|
|
unsigned Hi = (Imm >> 16) & 0xFFFF;
|
|
|
|
// Simple value.
|
|
if (isInt<16>(Imm)) {
|
|
// Just the Lo bits.
|
|
++Result;
|
|
} else if (Lo) {
|
|
// Handle the Hi bits and Lo bits.
|
|
Result += 2;
|
|
} else {
|
|
// Just the Hi bits.
|
|
++Result;
|
|
}
|
|
|
|
// If no shift, we're done.
|
|
if (!Shift) return Result;
|
|
|
|
// Shift for next step if the upper 32-bits were not zero.
|
|
if (Imm)
|
|
++Result;
|
|
|
|
// Add in the last bits as required.
|
|
if ((Hi = (Remainder >> 16) & 0xFFFF))
|
|
++Result;
|
|
if ((Lo = Remainder & 0xFFFF))
|
|
++Result;
|
|
|
|
return Result;
|
|
}
|
|
|
|
static uint64_t Rot64(uint64_t Imm, unsigned R) {
|
|
return (Imm << R) | (Imm >> (64 - R));
|
|
}
|
|
|
|
static unsigned SelectInt64Count(int64_t Imm) {
|
|
unsigned Count = SelectInt64CountDirect(Imm);
|
|
if (Count == 1)
|
|
return Count;
|
|
|
|
for (unsigned r = 1; r < 63; ++r) {
|
|
uint64_t RImm = Rot64(Imm, r);
|
|
unsigned RCount = SelectInt64CountDirect(RImm) + 1;
|
|
Count = std::min(Count, RCount);
|
|
|
|
// See comments in SelectInt64 for an explanation of the logic below.
|
|
unsigned LS = findLastSet(RImm);
|
|
if (LS != r-1)
|
|
continue;
|
|
|
|
uint64_t OnesMask = -(int64_t) (UINT64_C(1) << (LS+1));
|
|
uint64_t RImmWithOnes = RImm | OnesMask;
|
|
|
|
RCount = SelectInt64CountDirect(RImmWithOnes) + 1;
|
|
Count = std::min(Count, RCount);
|
|
}
|
|
|
|
return Count;
|
|
}
|
|
|
|
// Select a 64-bit constant. For cost-modeling purposes, SelectInt64Count
|
|
// (above) needs to be kept in sync with this function.
|
|
static SDNode *SelectInt64Direct(SelectionDAG *CurDAG, SDLoc dl, int64_t Imm) {
|
|
// Assume no remaining bits.
|
|
unsigned Remainder = 0;
|
|
// Assume no shift required.
|
|
unsigned Shift = 0;
|
|
|
|
// If it can't be represented as a 32 bit value.
|
|
if (!isInt<32>(Imm)) {
|
|
Shift = countTrailingZeros<uint64_t>(Imm);
|
|
int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
|
|
|
|
// If the shifted value fits 32 bits.
|
|
if (isInt<32>(ImmSh)) {
|
|
// Go with the shifted value.
|
|
Imm = ImmSh;
|
|
} else {
|
|
// Still stuck with a 64 bit value.
|
|
Remainder = Imm;
|
|
Shift = 32;
|
|
Imm >>= 32;
|
|
}
|
|
}
|
|
|
|
// Intermediate operand.
|
|
SDNode *Result;
|
|
|
|
// Handle first 32 bits.
|
|
unsigned Lo = Imm & 0xFFFF;
|
|
unsigned Hi = (Imm >> 16) & 0xFFFF;
|
|
|
|
auto getI32Imm = [CurDAG](unsigned Imm) {
|
|
return CurDAG->getTargetConstant(Imm, MVT::i32);
|
|
};
|
|
|
|
// Simple value.
|
|
if (isInt<16>(Imm)) {
|
|
// Just the Lo bits.
|
|
Result = CurDAG->getMachineNode(PPC::LI8, dl, MVT::i64, getI32Imm(Lo));
|
|
} else if (Lo) {
|
|
// Handle the Hi bits.
|
|
unsigned OpC = Hi ? PPC::LIS8 : PPC::LI8;
|
|
Result = CurDAG->getMachineNode(OpC, dl, MVT::i64, getI32Imm(Hi));
|
|
// And Lo bits.
|
|
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
|
|
SDValue(Result, 0), getI32Imm(Lo));
|
|
} else {
|
|
// Just the Hi bits.
|
|
Result = CurDAG->getMachineNode(PPC::LIS8, dl, MVT::i64, getI32Imm(Hi));
|
|
}
|
|
|
|
// If no shift, we're done.
|
|
if (!Shift) return Result;
|
|
|
|
// Shift for next step if the upper 32-bits were not zero.
|
|
if (Imm) {
|
|
Result = CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64,
|
|
SDValue(Result, 0),
|
|
getI32Imm(Shift),
|
|
getI32Imm(63 - Shift));
|
|
}
|
|
|
|
// Add in the last bits as required.
|
|
if ((Hi = (Remainder >> 16) & 0xFFFF)) {
|
|
Result = CurDAG->getMachineNode(PPC::ORIS8, dl, MVT::i64,
|
|
SDValue(Result, 0), getI32Imm(Hi));
|
|
}
|
|
if ((Lo = Remainder & 0xFFFF)) {
|
|
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
|
|
SDValue(Result, 0), getI32Imm(Lo));
|
|
}
|
|
|
|
return Result;
|
|
}
|
|
|
|
static SDNode *SelectInt64(SelectionDAG *CurDAG, SDLoc dl, int64_t Imm) {
|
|
unsigned Count = SelectInt64CountDirect(Imm);
|
|
if (Count == 1)
|
|
return SelectInt64Direct(CurDAG, dl, Imm);
|
|
|
|
unsigned RMin = 0;
|
|
|
|
int64_t MatImm;
|
|
unsigned MaskEnd;
|
|
|
|
for (unsigned r = 1; r < 63; ++r) {
|
|
uint64_t RImm = Rot64(Imm, r);
|
|
unsigned RCount = SelectInt64CountDirect(RImm) + 1;
|
|
if (RCount < Count) {
|
|
Count = RCount;
|
|
RMin = r;
|
|
MatImm = RImm;
|
|
MaskEnd = 63;
|
|
}
|
|
|
|
// If the immediate to generate has many trailing zeros, it might be
|
|
// worthwhile to generate a rotated value with too many leading ones
|
|
// (because that's free with li/lis's sign-extension semantics), and then
|
|
// mask them off after rotation.
|
|
|
|
unsigned LS = findLastSet(RImm);
|
|
// We're adding (63-LS) higher-order ones, and we expect to mask them off
|
|
// after performing the inverse rotation by (64-r). So we need that:
|
|
// 63-LS == 64-r => LS == r-1
|
|
if (LS != r-1)
|
|
continue;
|
|
|
|
uint64_t OnesMask = -(int64_t) (UINT64_C(1) << (LS+1));
|
|
uint64_t RImmWithOnes = RImm | OnesMask;
|
|
|
|
RCount = SelectInt64CountDirect(RImmWithOnes) + 1;
|
|
if (RCount < Count) {
|
|
Count = RCount;
|
|
RMin = r;
|
|
MatImm = RImmWithOnes;
|
|
MaskEnd = LS;
|
|
}
|
|
}
|
|
|
|
if (!RMin)
|
|
return SelectInt64Direct(CurDAG, dl, Imm);
|
|
|
|
auto getI32Imm = [CurDAG](unsigned Imm) {
|
|
return CurDAG->getTargetConstant(Imm, MVT::i32);
|
|
};
|
|
|
|
SDValue Val = SDValue(SelectInt64Direct(CurDAG, dl, MatImm), 0);
|
|
return CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64, Val,
|
|
getI32Imm(64 - RMin), getI32Imm(MaskEnd));
|
|
}
|
|
|
|
// Select a 64-bit constant.
|
|
static SDNode *SelectInt64(SelectionDAG *CurDAG, SDNode *N) {
|
|
SDLoc dl(N);
|
|
|
|
// Get 64 bit value.
|
|
int64_t Imm = cast<ConstantSDNode>(N)->getZExtValue();
|
|
return SelectInt64(CurDAG, dl, Imm);
|
|
}
|
|
|
|
namespace {
|
|
class BitPermutationSelector {
|
|
struct ValueBit {
|
|
SDValue V;
|
|
|
|
// The bit number in the value, using a convention where bit 0 is the
|
|
// lowest-order bit.
|
|
unsigned Idx;
|
|
|
|
enum Kind {
|
|
ConstZero,
|
|
Variable
|
|
} K;
|
|
|
|
ValueBit(SDValue V, unsigned I, Kind K = Variable)
|
|
: V(V), Idx(I), K(K) {}
|
|
ValueBit(Kind K = Variable)
|
|
: V(SDValue(nullptr, 0)), Idx(UINT32_MAX), K(K) {}
|
|
|
|
bool isZero() const {
|
|
return K == ConstZero;
|
|
}
|
|
|
|
bool hasValue() const {
|
|
return K == Variable;
|
|
}
|
|
|
|
SDValue getValue() const {
|
|
assert(hasValue() && "Cannot get the value of a constant bit");
|
|
return V;
|
|
}
|
|
|
|
unsigned getValueBitIndex() const {
|
|
assert(hasValue() && "Cannot get the value bit index of a constant bit");
|
|
return Idx;
|
|
}
|
|
};
|
|
|
|
// A bit group has the same underlying value and the same rotate factor.
|
|
struct BitGroup {
|
|
SDValue V;
|
|
unsigned RLAmt;
|
|
unsigned StartIdx, EndIdx;
|
|
|
|
// This rotation amount assumes that the lower 32 bits of the quantity are
|
|
// replicated in the high 32 bits by the rotation operator (which is done
|
|
// by rlwinm and friends in 64-bit mode).
|
|
bool Repl32;
|
|
// Did converting to Repl32 == true change the rotation factor? If it did,
|
|
// it decreased it by 32.
|
|
bool Repl32CR;
|
|
// Was this group coalesced after setting Repl32 to true?
|
|
bool Repl32Coalesced;
|
|
|
|
BitGroup(SDValue V, unsigned R, unsigned S, unsigned E)
|
|
: V(V), RLAmt(R), StartIdx(S), EndIdx(E), Repl32(false), Repl32CR(false),
|
|
Repl32Coalesced(false) {
|
|
DEBUG(dbgs() << "\tbit group for " << V.getNode() << " RLAmt = " << R <<
|
|
" [" << S << ", " << E << "]\n");
|
|
}
|
|
};
|
|
|
|
// Information on each (Value, RLAmt) pair (like the number of groups
|
|
// associated with each) used to choose the lowering method.
|
|
struct ValueRotInfo {
|
|
SDValue V;
|
|
unsigned RLAmt;
|
|
unsigned NumGroups;
|
|
unsigned FirstGroupStartIdx;
|
|
bool Repl32;
|
|
|
|
ValueRotInfo()
|
|
: RLAmt(UINT32_MAX), NumGroups(0), FirstGroupStartIdx(UINT32_MAX),
|
|
Repl32(false) {}
|
|
|
|
// For sorting (in reverse order) by NumGroups, and then by
|
|
// FirstGroupStartIdx.
|
|
bool operator < (const ValueRotInfo &Other) const {
|
|
// We need to sort so that the non-Repl32 come first because, when we're
|
|
// doing masking, the Repl32 bit groups might be subsumed into the 64-bit
|
|
// masking operation.
|
|
if (Repl32 < Other.Repl32)
|
|
return true;
|
|
else if (Repl32 > Other.Repl32)
|
|
return false;
|
|
else if (NumGroups > Other.NumGroups)
|
|
return true;
|
|
else if (NumGroups < Other.NumGroups)
|
|
return false;
|
|
else if (FirstGroupStartIdx < Other.FirstGroupStartIdx)
|
|
return true;
|
|
return false;
|
|
}
|
|
};
|
|
|
|
// Return true if something interesting was deduced, return false if we're
|
|
// providing only a generic representation of V (or something else likewise
|
|
// uninteresting for instruction selection).
|
|
bool getValueBits(SDValue V, SmallVector<ValueBit, 64> &Bits) {
|
|
switch (V.getOpcode()) {
|
|
default: break;
|
|
case ISD::ROTL:
|
|
if (isa<ConstantSDNode>(V.getOperand(1))) {
|
|
unsigned RotAmt = V.getConstantOperandVal(1);
|
|
|
|
SmallVector<ValueBit, 64> LHSBits(Bits.size());
|
|
getValueBits(V.getOperand(0), LHSBits);
|
|
|
|
for (unsigned i = 0; i < Bits.size(); ++i)
|
|
Bits[i] = LHSBits[i < RotAmt ? i + (Bits.size() - RotAmt) : i - RotAmt];
|
|
|
|
return true;
|
|
}
|
|
break;
|
|
case ISD::SHL:
|
|
if (isa<ConstantSDNode>(V.getOperand(1))) {
|
|
unsigned ShiftAmt = V.getConstantOperandVal(1);
|
|
|
|
SmallVector<ValueBit, 64> LHSBits(Bits.size());
|
|
getValueBits(V.getOperand(0), LHSBits);
|
|
|
|
for (unsigned i = ShiftAmt; i < Bits.size(); ++i)
|
|
Bits[i] = LHSBits[i - ShiftAmt];
|
|
|
|
for (unsigned i = 0; i < ShiftAmt; ++i)
|
|
Bits[i] = ValueBit(ValueBit::ConstZero);
|
|
|
|
return true;
|
|
}
|
|
break;
|
|
case ISD::SRL:
|
|
if (isa<ConstantSDNode>(V.getOperand(1))) {
|
|
unsigned ShiftAmt = V.getConstantOperandVal(1);
|
|
|
|
SmallVector<ValueBit, 64> LHSBits(Bits.size());
|
|
getValueBits(V.getOperand(0), LHSBits);
|
|
|
|
for (unsigned i = 0; i < Bits.size() - ShiftAmt; ++i)
|
|
Bits[i] = LHSBits[i + ShiftAmt];
|
|
|
|
for (unsigned i = Bits.size() - ShiftAmt; i < Bits.size(); ++i)
|
|
Bits[i] = ValueBit(ValueBit::ConstZero);
|
|
|
|
return true;
|
|
}
|
|
break;
|
|
case ISD::AND:
|
|
if (isa<ConstantSDNode>(V.getOperand(1))) {
|
|
uint64_t Mask = V.getConstantOperandVal(1);
|
|
|
|
SmallVector<ValueBit, 64> LHSBits(Bits.size());
|
|
bool LHSTrivial = getValueBits(V.getOperand(0), LHSBits);
|
|
|
|
for (unsigned i = 0; i < Bits.size(); ++i)
|
|
if (((Mask >> i) & 1) == 1)
|
|
Bits[i] = LHSBits[i];
|
|
else
|
|
Bits[i] = ValueBit(ValueBit::ConstZero);
|
|
|
|
// Mark this as interesting, only if the LHS was also interesting. This
|
|
// prevents the overall procedure from matching a single immediate 'and'
|
|
// (which is non-optimal because such an and might be folded with other
|
|
// things if we don't select it here).
|
|
return LHSTrivial;
|
|
}
|
|
break;
|
|
case ISD::OR: {
|
|
SmallVector<ValueBit, 64> LHSBits(Bits.size()), RHSBits(Bits.size());
|
|
getValueBits(V.getOperand(0), LHSBits);
|
|
getValueBits(V.getOperand(1), RHSBits);
|
|
|
|
bool AllDisjoint = true;
|
|
for (unsigned i = 0; i < Bits.size(); ++i)
|
|
if (LHSBits[i].isZero())
|
|
Bits[i] = RHSBits[i];
|
|
else if (RHSBits[i].isZero())
|
|
Bits[i] = LHSBits[i];
|
|
else {
|
|
AllDisjoint = false;
|
|
break;
|
|
}
|
|
|
|
if (!AllDisjoint)
|
|
break;
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
for (unsigned i = 0; i < Bits.size(); ++i)
|
|
Bits[i] = ValueBit(V, i);
|
|
|
|
return false;
|
|
}
|
|
|
|
// For each value (except the constant ones), compute the left-rotate amount
|
|
// to get it from its original to final position.
|
|
void computeRotationAmounts() {
|
|
HasZeros = false;
|
|
RLAmt.resize(Bits.size());
|
|
for (unsigned i = 0; i < Bits.size(); ++i)
|
|
if (Bits[i].hasValue()) {
|
|
unsigned VBI = Bits[i].getValueBitIndex();
|
|
if (i >= VBI)
|
|
RLAmt[i] = i - VBI;
|
|
else
|
|
RLAmt[i] = Bits.size() - (VBI - i);
|
|
} else if (Bits[i].isZero()) {
|
|
HasZeros = true;
|
|
RLAmt[i] = UINT32_MAX;
|
|
} else {
|
|
llvm_unreachable("Unknown value bit type");
|
|
}
|
|
}
|
|
|
|
// Collect groups of consecutive bits with the same underlying value and
|
|
// rotation factor. If we're doing late masking, we ignore zeros, otherwise
|
|
// they break up groups.
|
|
void collectBitGroups(bool LateMask) {
|
|
BitGroups.clear();
|
|
|
|
unsigned LastRLAmt = RLAmt[0];
|
|
SDValue LastValue = Bits[0].hasValue() ? Bits[0].getValue() : SDValue();
|
|
unsigned LastGroupStartIdx = 0;
|
|
for (unsigned i = 1; i < Bits.size(); ++i) {
|
|
unsigned ThisRLAmt = RLAmt[i];
|
|
SDValue ThisValue = Bits[i].hasValue() ? Bits[i].getValue() : SDValue();
|
|
if (LateMask && !ThisValue) {
|
|
ThisValue = LastValue;
|
|
ThisRLAmt = LastRLAmt;
|
|
// If we're doing late masking, then the first bit group always starts
|
|
// at zero (even if the first bits were zero).
|
|
if (BitGroups.empty())
|
|
LastGroupStartIdx = 0;
|
|
}
|
|
|
|
// If this bit has the same underlying value and the same rotate factor as
|
|
// the last one, then they're part of the same group.
|
|
if (ThisRLAmt == LastRLAmt && ThisValue == LastValue)
|
|
continue;
|
|
|
|
if (LastValue.getNode())
|
|
BitGroups.push_back(BitGroup(LastValue, LastRLAmt, LastGroupStartIdx,
|
|
i-1));
|
|
LastRLAmt = ThisRLAmt;
|
|
LastValue = ThisValue;
|
|
LastGroupStartIdx = i;
|
|
}
|
|
if (LastValue.getNode())
|
|
BitGroups.push_back(BitGroup(LastValue, LastRLAmt, LastGroupStartIdx,
|
|
Bits.size()-1));
|
|
|
|
if (BitGroups.empty())
|
|
return;
|
|
|
|
// We might be able to combine the first and last groups.
|
|
if (BitGroups.size() > 1) {
|
|
// If the first and last groups are the same, then remove the first group
|
|
// in favor of the last group, making the ending index of the last group
|
|
// equal to the ending index of the to-be-removed first group.
|
|
if (BitGroups[0].StartIdx == 0 &&
|
|
BitGroups[BitGroups.size()-1].EndIdx == Bits.size()-1 &&
|
|
BitGroups[0].V == BitGroups[BitGroups.size()-1].V &&
|
|
BitGroups[0].RLAmt == BitGroups[BitGroups.size()-1].RLAmt) {
|
|
DEBUG(dbgs() << "\tcombining final bit group with inital one\n");
|
|
BitGroups[BitGroups.size()-1].EndIdx = BitGroups[0].EndIdx;
|
|
BitGroups.erase(BitGroups.begin());
|
|
}
|
|
}
|
|
}
|
|
|
|
// Take all (SDValue, RLAmt) pairs and sort them by the number of groups
|
|
// associated with each. If there is a degeneracy, pick the one that occurs
|
|
// first (in the final value).
|
|
void collectValueRotInfo() {
|
|
ValueRots.clear();
|
|
|
|
for (auto &BG : BitGroups) {
|
|
unsigned RLAmtKey = BG.RLAmt + (BG.Repl32 ? 64 : 0);
|
|
ValueRotInfo &VRI = ValueRots[std::make_pair(BG.V, RLAmtKey)];
|
|
VRI.V = BG.V;
|
|
VRI.RLAmt = BG.RLAmt;
|
|
VRI.Repl32 = BG.Repl32;
|
|
VRI.NumGroups += 1;
|
|
VRI.FirstGroupStartIdx = std::min(VRI.FirstGroupStartIdx, BG.StartIdx);
|
|
}
|
|
|
|
// Now that we've collected the various ValueRotInfo instances, we need to
|
|
// sort them.
|
|
ValueRotsVec.clear();
|
|
for (auto &I : ValueRots) {
|
|
ValueRotsVec.push_back(I.second);
|
|
}
|
|
std::sort(ValueRotsVec.begin(), ValueRotsVec.end());
|
|
}
|
|
|
|
// In 64-bit mode, rlwinm and friends have a rotation operator that
|
|
// replicates the low-order 32 bits into the high-order 32-bits. The mask
|
|
// indices of these instructions can only be in the lower 32 bits, so they
|
|
// can only represent some 64-bit bit groups. However, when they can be used,
|
|
// the 32-bit replication can be used to represent, as a single bit group,
|
|
// otherwise separate bit groups. We'll convert to replicated-32-bit bit
|
|
// groups when possible. Returns true if any of the bit groups were
|
|
// converted.
|
|
void assignRepl32BitGroups() {
|
|
// If we have bits like this:
|
|
//
|
|
// Indices: 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
|
|
// V bits: ... 7 6 5 4 3 2 1 0 31 30 29 28 27 26 25 24
|
|
// Groups: | RLAmt = 8 | RLAmt = 40 |
|
|
//
|
|
// But, making use of a 32-bit operation that replicates the low-order 32
|
|
// bits into the high-order 32 bits, this can be one bit group with a RLAmt
|
|
// of 8.
|
|
|
|
auto IsAllLow32 = [this](BitGroup & BG) {
|
|
if (BG.StartIdx <= BG.EndIdx) {
|
|
for (unsigned i = BG.StartIdx; i <= BG.EndIdx; ++i) {
|
|
if (!Bits[i].hasValue())
|
|
continue;
|
|
if (Bits[i].getValueBitIndex() >= 32)
|
|
return false;
|
|
}
|
|
} else {
|
|
for (unsigned i = BG.StartIdx; i < Bits.size(); ++i) {
|
|
if (!Bits[i].hasValue())
|
|
continue;
|
|
if (Bits[i].getValueBitIndex() >= 32)
|
|
return false;
|
|
}
|
|
for (unsigned i = 0; i <= BG.EndIdx; ++i) {
|
|
if (!Bits[i].hasValue())
|
|
continue;
|
|
if (Bits[i].getValueBitIndex() >= 32)
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
};
|
|
|
|
for (auto &BG : BitGroups) {
|
|
if (BG.StartIdx < 32 && BG.EndIdx < 32) {
|
|
if (IsAllLow32(BG)) {
|
|
if (BG.RLAmt >= 32) {
|
|
BG.RLAmt -= 32;
|
|
BG.Repl32CR = true;
|
|
}
|
|
|
|
BG.Repl32 = true;
|
|
|
|
DEBUG(dbgs() << "\t32-bit replicated bit group for " <<
|
|
BG.V.getNode() << " RLAmt = " << BG.RLAmt <<
|
|
" [" << BG.StartIdx << ", " << BG.EndIdx << "]\n");
|
|
}
|
|
}
|
|
}
|
|
|
|
// Now walk through the bit groups, consolidating where possible.
|
|
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
|
|
// We might want to remove this bit group by merging it with the previous
|
|
// group (which might be the ending group).
|
|
auto IP = (I == BitGroups.begin()) ?
|
|
std::prev(BitGroups.end()) : std::prev(I);
|
|
if (I->Repl32 && IP->Repl32 && I->V == IP->V && I->RLAmt == IP->RLAmt &&
|
|
I->StartIdx == (IP->EndIdx + 1) % 64 && I != IP) {
|
|
|
|
DEBUG(dbgs() << "\tcombining 32-bit replicated bit group for " <<
|
|
I->V.getNode() << " RLAmt = " << I->RLAmt <<
|
|
" [" << I->StartIdx << ", " << I->EndIdx <<
|
|
"] with group with range [" <<
|
|
IP->StartIdx << ", " << IP->EndIdx << "]\n");
|
|
|
|
IP->EndIdx = I->EndIdx;
|
|
IP->Repl32CR = IP->Repl32CR || I->Repl32CR;
|
|
IP->Repl32Coalesced = true;
|
|
I = BitGroups.erase(I);
|
|
continue;
|
|
} else {
|
|
// There is a special case worth handling: If there is a single group
|
|
// covering the entire upper 32 bits, and it can be merged with both
|
|
// the next and previous groups (which might be the same group), then
|
|
// do so. If it is the same group (so there will be only one group in
|
|
// total), then we need to reverse the order of the range so that it
|
|
// covers the entire 64 bits.
|
|
if (I->StartIdx == 32 && I->EndIdx == 63) {
|
|
assert(std::next(I) == BitGroups.end() &&
|
|
"bit group ends at index 63 but there is another?");
|
|
auto IN = BitGroups.begin();
|
|
|
|
if (IP->Repl32 && IN->Repl32 && I->V == IP->V && I->V == IN->V &&
|
|
(I->RLAmt % 32) == IP->RLAmt && (I->RLAmt % 32) == IN->RLAmt &&
|
|
IP->EndIdx == 31 && IN->StartIdx == 0 && I != IP &&
|
|
IsAllLow32(*I)) {
|
|
|
|
DEBUG(dbgs() << "\tcombining bit group for " <<
|
|
I->V.getNode() << " RLAmt = " << I->RLAmt <<
|
|
" [" << I->StartIdx << ", " << I->EndIdx <<
|
|
"] with 32-bit replicated groups with ranges [" <<
|
|
IP->StartIdx << ", " << IP->EndIdx << "] and [" <<
|
|
IN->StartIdx << ", " << IN->EndIdx << "]\n");
|
|
|
|
if (IP == IN) {
|
|
// There is only one other group; change it to cover the whole
|
|
// range (backward, so that it can still be Repl32 but cover the
|
|
// whole 64-bit range).
|
|
IP->StartIdx = 31;
|
|
IP->EndIdx = 30;
|
|
IP->Repl32CR = IP->Repl32CR || I->RLAmt >= 32;
|
|
IP->Repl32Coalesced = true;
|
|
I = BitGroups.erase(I);
|
|
} else {
|
|
// There are two separate groups, one before this group and one
|
|
// after us (at the beginning). We're going to remove this group,
|
|
// but also the group at the very beginning.
|
|
IP->EndIdx = IN->EndIdx;
|
|
IP->Repl32CR = IP->Repl32CR || IN->Repl32CR || I->RLAmt >= 32;
|
|
IP->Repl32Coalesced = true;
|
|
I = BitGroups.erase(I);
|
|
BitGroups.erase(BitGroups.begin());
|
|
}
|
|
|
|
// This must be the last group in the vector (and we might have
|
|
// just invalidated the iterator above), so break here.
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
++I;
|
|
}
|
|
}
|
|
|
|
SDValue getI32Imm(unsigned Imm) {
|
|
return CurDAG->getTargetConstant(Imm, MVT::i32);
|
|
}
|
|
|
|
uint64_t getZerosMask() {
|
|
uint64_t Mask = 0;
|
|
for (unsigned i = 0; i < Bits.size(); ++i) {
|
|
if (Bits[i].hasValue())
|
|
continue;
|
|
Mask |= (UINT64_C(1) << i);
|
|
}
|
|
|
|
return ~Mask;
|
|
}
|
|
|
|
// Depending on the number of groups for a particular value, it might be
|
|
// better to rotate, mask explicitly (using andi/andis), and then or the
|
|
// result. Select this part of the result first.
|
|
void SelectAndParts32(SDLoc dl, SDValue &Res, unsigned *InstCnt) {
|
|
if (BPermRewriterNoMasking)
|
|
return;
|
|
|
|
for (ValueRotInfo &VRI : ValueRotsVec) {
|
|
unsigned Mask = 0;
|
|
for (unsigned i = 0; i < Bits.size(); ++i) {
|
|
if (!Bits[i].hasValue() || Bits[i].getValue() != VRI.V)
|
|
continue;
|
|
if (RLAmt[i] != VRI.RLAmt)
|
|
continue;
|
|
Mask |= (1u << i);
|
|
}
|
|
|
|
// Compute the masks for andi/andis that would be necessary.
|
|
unsigned ANDIMask = (Mask & UINT16_MAX), ANDISMask = Mask >> 16;
|
|
assert((ANDIMask != 0 || ANDISMask != 0) &&
|
|
"No set bits in mask for value bit groups");
|
|
bool NeedsRotate = VRI.RLAmt != 0;
|
|
|
|
// We're trying to minimize the number of instructions. If we have one
|
|
// group, using one of andi/andis can break even. If we have three
|
|
// groups, we can use both andi and andis and break even (to use both
|
|
// andi and andis we also need to or the results together). We need four
|
|
// groups if we also need to rotate. To use andi/andis we need to do more
|
|
// than break even because rotate-and-mask instructions tend to be easier
|
|
// to schedule.
|
|
|
|
// FIXME: We've biased here against using andi/andis, which is right for
|
|
// POWER cores, but not optimal everywhere. For example, on the A2,
|
|
// andi/andis have single-cycle latency whereas the rotate-and-mask
|
|
// instructions take two cycles, and it would be better to bias toward
|
|
// andi/andis in break-even cases.
|
|
|
|
unsigned NumAndInsts = (unsigned) NeedsRotate +
|
|
(unsigned) (ANDIMask != 0) +
|
|
(unsigned) (ANDISMask != 0) +
|
|
(unsigned) (ANDIMask != 0 && ANDISMask != 0) +
|
|
(unsigned) (bool) Res;
|
|
|
|
DEBUG(dbgs() << "\t\trotation groups for " << VRI.V.getNode() <<
|
|
" RL: " << VRI.RLAmt << ":" <<
|
|
"\n\t\t\tisel using masking: " << NumAndInsts <<
|
|
" using rotates: " << VRI.NumGroups << "\n");
|
|
|
|
if (NumAndInsts >= VRI.NumGroups)
|
|
continue;
|
|
|
|
DEBUG(dbgs() << "\t\t\t\tusing masking\n");
|
|
|
|
if (InstCnt) *InstCnt += NumAndInsts;
|
|
|
|
SDValue VRot;
|
|
if (VRI.RLAmt) {
|
|
SDValue Ops[] =
|
|
{ VRI.V, getI32Imm(VRI.RLAmt), getI32Imm(0), getI32Imm(31) };
|
|
VRot = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32,
|
|
Ops), 0);
|
|
} else {
|
|
VRot = VRI.V;
|
|
}
|
|
|
|
SDValue ANDIVal, ANDISVal;
|
|
if (ANDIMask != 0)
|
|
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo, dl, MVT::i32,
|
|
VRot, getI32Imm(ANDIMask)), 0);
|
|
if (ANDISMask != 0)
|
|
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo, dl, MVT::i32,
|
|
VRot, getI32Imm(ANDISMask)), 0);
|
|
|
|
SDValue TotalVal;
|
|
if (!ANDIVal)
|
|
TotalVal = ANDISVal;
|
|
else if (!ANDISVal)
|
|
TotalVal = ANDIVal;
|
|
else
|
|
TotalVal = SDValue(CurDAG->getMachineNode(PPC::OR, dl, MVT::i32,
|
|
ANDIVal, ANDISVal), 0);
|
|
|
|
if (!Res)
|
|
Res = TotalVal;
|
|
else
|
|
Res = SDValue(CurDAG->getMachineNode(PPC::OR, dl, MVT::i32,
|
|
Res, TotalVal), 0);
|
|
|
|
// Now, remove all groups with this underlying value and rotation
|
|
// factor.
|
|
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
|
|
if (I->V == VRI.V && I->RLAmt == VRI.RLAmt)
|
|
I = BitGroups.erase(I);
|
|
else
|
|
++I;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Instruction selection for the 32-bit case.
|
|
SDNode *Select32(SDNode *N, bool LateMask, unsigned *InstCnt) {
|
|
SDLoc dl(N);
|
|
SDValue Res;
|
|
|
|
if (InstCnt) *InstCnt = 0;
|
|
|
|
// Take care of cases that should use andi/andis first.
|
|
SelectAndParts32(dl, Res, InstCnt);
|
|
|
|
// If we've not yet selected a 'starting' instruction, and we have no zeros
|
|
// to fill in, select the (Value, RLAmt) with the highest priority (largest
|
|
// number of groups), and start with this rotated value.
|
|
if ((!HasZeros || LateMask) && !Res) {
|
|
ValueRotInfo &VRI = ValueRotsVec[0];
|
|
if (VRI.RLAmt) {
|
|
if (InstCnt) *InstCnt += 1;
|
|
SDValue Ops[] =
|
|
{ VRI.V, getI32Imm(VRI.RLAmt), getI32Imm(0), getI32Imm(31) };
|
|
Res = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops), 0);
|
|
} else {
|
|
Res = VRI.V;
|
|
}
|
|
|
|
// Now, remove all groups with this underlying value and rotation factor.
|
|
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
|
|
if (I->V == VRI.V && I->RLAmt == VRI.RLAmt)
|
|
I = BitGroups.erase(I);
|
|
else
|
|
++I;
|
|
}
|
|
}
|
|
|
|
if (InstCnt) *InstCnt += BitGroups.size();
|
|
|
|
// Insert the other groups (one at a time).
|
|
for (auto &BG : BitGroups) {
|
|
if (!Res) {
|
|
SDValue Ops[] =
|
|
{ BG.V, getI32Imm(BG.RLAmt), getI32Imm(Bits.size() - BG.EndIdx - 1),
|
|
getI32Imm(Bits.size() - BG.StartIdx - 1) };
|
|
Res = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops), 0);
|
|
} else {
|
|
SDValue Ops[] =
|
|
{ Res, BG.V, getI32Imm(BG.RLAmt), getI32Imm(Bits.size() - BG.EndIdx - 1),
|
|
getI32Imm(Bits.size() - BG.StartIdx - 1) };
|
|
Res = SDValue(CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops), 0);
|
|
}
|
|
}
|
|
|
|
if (LateMask) {
|
|
unsigned Mask = (unsigned) getZerosMask();
|
|
|
|
unsigned ANDIMask = (Mask & UINT16_MAX), ANDISMask = Mask >> 16;
|
|
assert((ANDIMask != 0 || ANDISMask != 0) &&
|
|
"No set bits in zeros mask?");
|
|
|
|
if (InstCnt) *InstCnt += (unsigned) (ANDIMask != 0) +
|
|
(unsigned) (ANDISMask != 0) +
|
|
(unsigned) (ANDIMask != 0 && ANDISMask != 0);
|
|
|
|
SDValue ANDIVal, ANDISVal;
|
|
if (ANDIMask != 0)
|
|
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo, dl, MVT::i32,
|
|
Res, getI32Imm(ANDIMask)), 0);
|
|
if (ANDISMask != 0)
|
|
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo, dl, MVT::i32,
|
|
Res, getI32Imm(ANDISMask)), 0);
|
|
|
|
if (!ANDIVal)
|
|
Res = ANDISVal;
|
|
else if (!ANDISVal)
|
|
Res = ANDIVal;
|
|
else
|
|
Res = SDValue(CurDAG->getMachineNode(PPC::OR, dl, MVT::i32,
|
|
ANDIVal, ANDISVal), 0);
|
|
}
|
|
|
|
return Res.getNode();
|
|
}
|
|
|
|
unsigned SelectRotMask64Count(unsigned RLAmt, bool Repl32,
|
|
unsigned MaskStart, unsigned MaskEnd,
|
|
bool IsIns) {
|
|
// In the notation used by the instructions, 'start' and 'end' are reversed
|
|
// because bits are counted from high to low order.
|
|
unsigned InstMaskStart = 64 - MaskEnd - 1,
|
|
InstMaskEnd = 64 - MaskStart - 1;
|
|
|
|
if (Repl32)
|
|
return 1;
|
|
|
|
if ((!IsIns && (InstMaskEnd == 63 || InstMaskStart == 0)) ||
|
|
InstMaskEnd == 63 - RLAmt)
|
|
return 1;
|
|
|
|
return 2;
|
|
}
|
|
|
|
// For 64-bit values, not all combinations of rotates and masks are
|
|
// available. Produce one if it is available.
|
|
SDValue SelectRotMask64(SDValue V, SDLoc dl, unsigned RLAmt, bool Repl32,
|
|
unsigned MaskStart, unsigned MaskEnd,
|
|
unsigned *InstCnt = nullptr) {
|
|
// In the notation used by the instructions, 'start' and 'end' are reversed
|
|
// because bits are counted from high to low order.
|
|
unsigned InstMaskStart = 64 - MaskEnd - 1,
|
|
InstMaskEnd = 64 - MaskStart - 1;
|
|
|
|
if (InstCnt) *InstCnt += 1;
|
|
|
|
if (Repl32) {
|
|
// This rotation amount assumes that the lower 32 bits of the quantity
|
|
// are replicated in the high 32 bits by the rotation operator (which is
|
|
// done by rlwinm and friends).
|
|
assert(InstMaskStart >= 32 && "Mask cannot start out of range");
|
|
assert(InstMaskEnd >= 32 && "Mask cannot end out of range");
|
|
SDValue Ops[] =
|
|
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskStart - 32),
|
|
getI32Imm(InstMaskEnd - 32) };
|
|
return SDValue(CurDAG->getMachineNode(PPC::RLWINM8, dl, MVT::i64,
|
|
Ops), 0);
|
|
}
|
|
|
|
if (InstMaskEnd == 63) {
|
|
SDValue Ops[] =
|
|
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskStart) };
|
|
return SDValue(CurDAG->getMachineNode(PPC::RLDICL, dl, MVT::i64, Ops), 0);
|
|
}
|
|
|
|
if (InstMaskStart == 0) {
|
|
SDValue Ops[] =
|
|
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskEnd) };
|
|
return SDValue(CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64, Ops), 0);
|
|
}
|
|
|
|
if (InstMaskEnd == 63 - RLAmt) {
|
|
SDValue Ops[] =
|
|
{ V, getI32Imm(RLAmt), getI32Imm(InstMaskStart) };
|
|
return SDValue(CurDAG->getMachineNode(PPC::RLDIC, dl, MVT::i64, Ops), 0);
|
|
}
|
|
|
|
// We cannot do this with a single instruction, so we'll use two. The
|
|
// problem is that we're not free to choose both a rotation amount and mask
|
|
// start and end independently. We can choose an arbitrary mask start and
|
|
// end, but then the rotation amount is fixed. Rotation, however, can be
|
|
// inverted, and so by applying an "inverse" rotation first, we can get the
|
|
// desired result.
|
|
if (InstCnt) *InstCnt += 1;
|
|
|
|
// The rotation mask for the second instruction must be MaskStart.
|
|
unsigned RLAmt2 = MaskStart;
|
|
// The first instruction must rotate V so that the overall rotation amount
|
|
// is RLAmt.
|
|
unsigned RLAmt1 = (64 + RLAmt - RLAmt2) % 64;
|
|
if (RLAmt1)
|
|
V = SelectRotMask64(V, dl, RLAmt1, false, 0, 63);
|
|
return SelectRotMask64(V, dl, RLAmt2, false, MaskStart, MaskEnd);
|
|
}
|
|
|
|
// For 64-bit values, not all combinations of rotates and masks are
|
|
// available. Produce a rotate-mask-and-insert if one is available.
|
|
SDValue SelectRotMaskIns64(SDValue Base, SDValue V, SDLoc dl, unsigned RLAmt,
|
|
bool Repl32, unsigned MaskStart,
|
|
unsigned MaskEnd, unsigned *InstCnt = nullptr) {
|
|
// In the notation used by the instructions, 'start' and 'end' are reversed
|
|
// because bits are counted from high to low order.
|
|
unsigned InstMaskStart = 64 - MaskEnd - 1,
|
|
InstMaskEnd = 64 - MaskStart - 1;
|
|
|
|
if (InstCnt) *InstCnt += 1;
|
|
|
|
if (Repl32) {
|
|
// This rotation amount assumes that the lower 32 bits of the quantity
|
|
// are replicated in the high 32 bits by the rotation operator (which is
|
|
// done by rlwinm and friends).
|
|
assert(InstMaskStart >= 32 && "Mask cannot start out of range");
|
|
assert(InstMaskEnd >= 32 && "Mask cannot end out of range");
|
|
SDValue Ops[] =
|
|
{ Base, V, getI32Imm(RLAmt), getI32Imm(InstMaskStart - 32),
|
|
getI32Imm(InstMaskEnd - 32) };
|
|
return SDValue(CurDAG->getMachineNode(PPC::RLWIMI8, dl, MVT::i64,
|
|
Ops), 0);
|
|
}
|
|
|
|
if (InstMaskEnd == 63 - RLAmt) {
|
|
SDValue Ops[] =
|
|
{ Base, V, getI32Imm(RLAmt), getI32Imm(InstMaskStart) };
|
|
return SDValue(CurDAG->getMachineNode(PPC::RLDIMI, dl, MVT::i64, Ops), 0);
|
|
}
|
|
|
|
// We cannot do this with a single instruction, so we'll use two. The
|
|
// problem is that we're not free to choose both a rotation amount and mask
|
|
// start and end independently. We can choose an arbitrary mask start and
|
|
// end, but then the rotation amount is fixed. Rotation, however, can be
|
|
// inverted, and so by applying an "inverse" rotation first, we can get the
|
|
// desired result.
|
|
if (InstCnt) *InstCnt += 1;
|
|
|
|
// The rotation mask for the second instruction must be MaskStart.
|
|
unsigned RLAmt2 = MaskStart;
|
|
// The first instruction must rotate V so that the overall rotation amount
|
|
// is RLAmt.
|
|
unsigned RLAmt1 = (64 + RLAmt - RLAmt2) % 64;
|
|
if (RLAmt1)
|
|
V = SelectRotMask64(V, dl, RLAmt1, false, 0, 63);
|
|
return SelectRotMaskIns64(Base, V, dl, RLAmt2, false, MaskStart, MaskEnd);
|
|
}
|
|
|
|
void SelectAndParts64(SDLoc dl, SDValue &Res, unsigned *InstCnt) {
|
|
if (BPermRewriterNoMasking)
|
|
return;
|
|
|
|
// The idea here is the same as in the 32-bit version, but with additional
|
|
// complications from the fact that Repl32 might be true. Because we
|
|
// aggressively convert bit groups to Repl32 form (which, for small
|
|
// rotation factors, involves no other change), and then coalesce, it might
|
|
// be the case that a single 64-bit masking operation could handle both
|
|
// some Repl32 groups and some non-Repl32 groups. If converting to Repl32
|
|
// form allowed coalescing, then we must use a 32-bit rotaton in order to
|
|
// completely capture the new combined bit group.
|
|
|
|
for (ValueRotInfo &VRI : ValueRotsVec) {
|
|
uint64_t Mask = 0;
|
|
|
|
// We need to add to the mask all bits from the associated bit groups.
|
|
// If Repl32 is false, we need to add bits from bit groups that have
|
|
// Repl32 true, but are trivially convertable to Repl32 false. Such a
|
|
// group is trivially convertable if it overlaps only with the lower 32
|
|
// bits, and the group has not been coalesced.
|
|
auto MatchingBG = [VRI](BitGroup &BG) {
|
|
if (VRI.V != BG.V)
|
|
return false;
|
|
|
|
unsigned EffRLAmt = BG.RLAmt;
|
|
if (!VRI.Repl32 && BG.Repl32) {
|
|
if (BG.StartIdx < 32 && BG.EndIdx < 32 && BG.StartIdx <= BG.EndIdx &&
|
|
!BG.Repl32Coalesced) {
|
|
if (BG.Repl32CR)
|
|
EffRLAmt += 32;
|
|
} else {
|
|
return false;
|
|
}
|
|
} else if (VRI.Repl32 != BG.Repl32) {
|
|
return false;
|
|
}
|
|
|
|
if (VRI.RLAmt != EffRLAmt)
|
|
return false;
|
|
|
|
return true;
|
|
};
|
|
|
|
for (auto &BG : BitGroups) {
|
|
if (!MatchingBG(BG))
|
|
continue;
|
|
|
|
if (BG.StartIdx <= BG.EndIdx) {
|
|
for (unsigned i = BG.StartIdx; i <= BG.EndIdx; ++i)
|
|
Mask |= (UINT64_C(1) << i);
|
|
} else {
|
|
for (unsigned i = BG.StartIdx; i < Bits.size(); ++i)
|
|
Mask |= (UINT64_C(1) << i);
|
|
for (unsigned i = 0; i <= BG.EndIdx; ++i)
|
|
Mask |= (UINT64_C(1) << i);
|
|
}
|
|
}
|
|
|
|
// We can use the 32-bit andi/andis technique if the mask does not
|
|
// require any higher-order bits. This can save an instruction compared
|
|
// to always using the general 64-bit technique.
|
|
bool Use32BitInsts = isUInt<32>(Mask);
|
|
// Compute the masks for andi/andis that would be necessary.
|
|
unsigned ANDIMask = (Mask & UINT16_MAX),
|
|
ANDISMask = (Mask >> 16) & UINT16_MAX;
|
|
|
|
bool NeedsRotate = VRI.RLAmt || (VRI.Repl32 && !isUInt<32>(Mask));
|
|
|
|
unsigned NumAndInsts = (unsigned) NeedsRotate +
|
|
(unsigned) (bool) Res;
|
|
if (Use32BitInsts)
|
|
NumAndInsts += (unsigned) (ANDIMask != 0) + (unsigned) (ANDISMask != 0) +
|
|
(unsigned) (ANDIMask != 0 && ANDISMask != 0);
|
|
else
|
|
NumAndInsts += SelectInt64Count(Mask) + /* and */ 1;
|
|
|
|
unsigned NumRLInsts = 0;
|
|
bool FirstBG = true;
|
|
for (auto &BG : BitGroups) {
|
|
if (!MatchingBG(BG))
|
|
continue;
|
|
NumRLInsts +=
|
|
SelectRotMask64Count(BG.RLAmt, BG.Repl32, BG.StartIdx, BG.EndIdx,
|
|
!FirstBG);
|
|
FirstBG = false;
|
|
}
|
|
|
|
DEBUG(dbgs() << "\t\trotation groups for " << VRI.V.getNode() <<
|
|
" RL: " << VRI.RLAmt << (VRI.Repl32 ? " (32):" : ":") <<
|
|
"\n\t\t\tisel using masking: " << NumAndInsts <<
|
|
" using rotates: " << NumRLInsts << "\n");
|
|
|
|
// When we'd use andi/andis, we bias toward using the rotates (andi only
|
|
// has a record form, and is cracked on POWER cores). However, when using
|
|
// general 64-bit constant formation, bias toward the constant form,
|
|
// because that exposes more opportunities for CSE.
|
|
if (NumAndInsts > NumRLInsts)
|
|
continue;
|
|
if (Use32BitInsts && NumAndInsts == NumRLInsts)
|
|
continue;
|
|
|
|
DEBUG(dbgs() << "\t\t\t\tusing masking\n");
|
|
|
|
if (InstCnt) *InstCnt += NumAndInsts;
|
|
|
|
SDValue VRot;
|
|
// We actually need to generate a rotation if we have a non-zero rotation
|
|
// factor or, in the Repl32 case, if we care about any of the
|
|
// higher-order replicated bits. In the latter case, we generate a mask
|
|
// backward so that it actually includes the entire 64 bits.
|
|
if (VRI.RLAmt || (VRI.Repl32 && !isUInt<32>(Mask)))
|
|
VRot = SelectRotMask64(VRI.V, dl, VRI.RLAmt, VRI.Repl32,
|
|
VRI.Repl32 ? 31 : 0, VRI.Repl32 ? 30 : 63);
|
|
else
|
|
VRot = VRI.V;
|
|
|
|
SDValue TotalVal;
|
|
if (Use32BitInsts) {
|
|
assert((ANDIMask != 0 || ANDISMask != 0) &&
|
|
"No set bits in mask when using 32-bit ands for 64-bit value");
|
|
|
|
SDValue ANDIVal, ANDISVal;
|
|
if (ANDIMask != 0)
|
|
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo8, dl, MVT::i64,
|
|
VRot, getI32Imm(ANDIMask)), 0);
|
|
if (ANDISMask != 0)
|
|
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo8, dl, MVT::i64,
|
|
VRot, getI32Imm(ANDISMask)), 0);
|
|
|
|
if (!ANDIVal)
|
|
TotalVal = ANDISVal;
|
|
else if (!ANDISVal)
|
|
TotalVal = ANDIVal;
|
|
else
|
|
TotalVal = SDValue(CurDAG->getMachineNode(PPC::OR8, dl, MVT::i64,
|
|
ANDIVal, ANDISVal), 0);
|
|
} else {
|
|
TotalVal = SDValue(SelectInt64(CurDAG, dl, Mask), 0);
|
|
TotalVal =
|
|
SDValue(CurDAG->getMachineNode(PPC::AND8, dl, MVT::i64,
|
|
VRot, TotalVal), 0);
|
|
}
|
|
|
|
if (!Res)
|
|
Res = TotalVal;
|
|
else
|
|
Res = SDValue(CurDAG->getMachineNode(PPC::OR8, dl, MVT::i64,
|
|
Res, TotalVal), 0);
|
|
|
|
// Now, remove all groups with this underlying value and rotation
|
|
// factor.
|
|
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
|
|
if (MatchingBG(*I))
|
|
I = BitGroups.erase(I);
|
|
else
|
|
++I;
|
|
}
|
|
}
|
|
}
|
|
|
|
// Instruction selection for the 64-bit case.
|
|
SDNode *Select64(SDNode *N, bool LateMask, unsigned *InstCnt) {
|
|
SDLoc dl(N);
|
|
SDValue Res;
|
|
|
|
if (InstCnt) *InstCnt = 0;
|
|
|
|
// Take care of cases that should use andi/andis first.
|
|
SelectAndParts64(dl, Res, InstCnt);
|
|
|
|
// If we've not yet selected a 'starting' instruction, and we have no zeros
|
|
// to fill in, select the (Value, RLAmt) with the highest priority (largest
|
|
// number of groups), and start with this rotated value.
|
|
if ((!HasZeros || LateMask) && !Res) {
|
|
// If we have both Repl32 groups and non-Repl32 groups, the non-Repl32
|
|
// groups will come first, and so the VRI representing the largest number
|
|
// of groups might not be first (it might be the first Repl32 groups).
|
|
unsigned MaxGroupsIdx = 0;
|
|
if (!ValueRotsVec[0].Repl32) {
|
|
for (unsigned i = 0, ie = ValueRotsVec.size(); i < ie; ++i)
|
|
if (ValueRotsVec[i].Repl32) {
|
|
if (ValueRotsVec[i].NumGroups > ValueRotsVec[0].NumGroups)
|
|
MaxGroupsIdx = i;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ValueRotInfo &VRI = ValueRotsVec[MaxGroupsIdx];
|
|
bool NeedsRotate = false;
|
|
if (VRI.RLAmt) {
|
|
NeedsRotate = true;
|
|
} else if (VRI.Repl32) {
|
|
for (auto &BG : BitGroups) {
|
|
if (BG.V != VRI.V || BG.RLAmt != VRI.RLAmt ||
|
|
BG.Repl32 != VRI.Repl32)
|
|
continue;
|
|
|
|
// We don't need a rotate if the bit group is confined to the lower
|
|
// 32 bits.
|
|
if (BG.StartIdx < 32 && BG.EndIdx < 32 && BG.StartIdx < BG.EndIdx)
|
|
continue;
|
|
|
|
NeedsRotate = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (NeedsRotate)
|
|
Res = SelectRotMask64(VRI.V, dl, VRI.RLAmt, VRI.Repl32,
|
|
VRI.Repl32 ? 31 : 0, VRI.Repl32 ? 30 : 63,
|
|
InstCnt);
|
|
else
|
|
Res = VRI.V;
|
|
|
|
// Now, remove all groups with this underlying value and rotation factor.
|
|
if (Res)
|
|
for (auto I = BitGroups.begin(); I != BitGroups.end();) {
|
|
if (I->V == VRI.V && I->RLAmt == VRI.RLAmt && I->Repl32 == VRI.Repl32)
|
|
I = BitGroups.erase(I);
|
|
else
|
|
++I;
|
|
}
|
|
}
|
|
|
|
// Because 64-bit rotates are more flexible than inserts, we might have a
|
|
// preference regarding which one we do first (to save one instruction).
|
|
if (!Res)
|
|
for (auto I = BitGroups.begin(), IE = BitGroups.end(); I != IE; ++I) {
|
|
if (SelectRotMask64Count(I->RLAmt, I->Repl32, I->StartIdx, I->EndIdx,
|
|
false) <
|
|
SelectRotMask64Count(I->RLAmt, I->Repl32, I->StartIdx, I->EndIdx,
|
|
true)) {
|
|
if (I != BitGroups.begin()) {
|
|
BitGroup BG = *I;
|
|
BitGroups.erase(I);
|
|
BitGroups.insert(BitGroups.begin(), BG);
|
|
}
|
|
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Insert the other groups (one at a time).
|
|
for (auto &BG : BitGroups) {
|
|
if (!Res)
|
|
Res = SelectRotMask64(BG.V, dl, BG.RLAmt, BG.Repl32, BG.StartIdx,
|
|
BG.EndIdx, InstCnt);
|
|
else
|
|
Res = SelectRotMaskIns64(Res, BG.V, dl, BG.RLAmt, BG.Repl32,
|
|
BG.StartIdx, BG.EndIdx, InstCnt);
|
|
}
|
|
|
|
if (LateMask) {
|
|
uint64_t Mask = getZerosMask();
|
|
|
|
// We can use the 32-bit andi/andis technique if the mask does not
|
|
// require any higher-order bits. This can save an instruction compared
|
|
// to always using the general 64-bit technique.
|
|
bool Use32BitInsts = isUInt<32>(Mask);
|
|
// Compute the masks for andi/andis that would be necessary.
|
|
unsigned ANDIMask = (Mask & UINT16_MAX),
|
|
ANDISMask = (Mask >> 16) & UINT16_MAX;
|
|
|
|
if (Use32BitInsts) {
|
|
assert((ANDIMask != 0 || ANDISMask != 0) &&
|
|
"No set bits in mask when using 32-bit ands for 64-bit value");
|
|
|
|
if (InstCnt) *InstCnt += (unsigned) (ANDIMask != 0) +
|
|
(unsigned) (ANDISMask != 0) +
|
|
(unsigned) (ANDIMask != 0 && ANDISMask != 0);
|
|
|
|
SDValue ANDIVal, ANDISVal;
|
|
if (ANDIMask != 0)
|
|
ANDIVal = SDValue(CurDAG->getMachineNode(PPC::ANDIo8, dl, MVT::i64,
|
|
Res, getI32Imm(ANDIMask)), 0);
|
|
if (ANDISMask != 0)
|
|
ANDISVal = SDValue(CurDAG->getMachineNode(PPC::ANDISo8, dl, MVT::i64,
|
|
Res, getI32Imm(ANDISMask)), 0);
|
|
|
|
if (!ANDIVal)
|
|
Res = ANDISVal;
|
|
else if (!ANDISVal)
|
|
Res = ANDIVal;
|
|
else
|
|
Res = SDValue(CurDAG->getMachineNode(PPC::OR8, dl, MVT::i64,
|
|
ANDIVal, ANDISVal), 0);
|
|
} else {
|
|
if (InstCnt) *InstCnt += SelectInt64Count(Mask) + /* and */ 1;
|
|
|
|
SDValue MaskVal = SDValue(SelectInt64(CurDAG, dl, Mask), 0);
|
|
Res =
|
|
SDValue(CurDAG->getMachineNode(PPC::AND8, dl, MVT::i64,
|
|
Res, MaskVal), 0);
|
|
}
|
|
}
|
|
|
|
return Res.getNode();
|
|
}
|
|
|
|
SDNode *Select(SDNode *N, bool LateMask, unsigned *InstCnt = nullptr) {
|
|
// Fill in BitGroups.
|
|
collectBitGroups(LateMask);
|
|
if (BitGroups.empty())
|
|
return nullptr;
|
|
|
|
// For 64-bit values, figure out when we can use 32-bit instructions.
|
|
if (Bits.size() == 64)
|
|
assignRepl32BitGroups();
|
|
|
|
// Fill in ValueRotsVec.
|
|
collectValueRotInfo();
|
|
|
|
if (Bits.size() == 32) {
|
|
return Select32(N, LateMask, InstCnt);
|
|
} else {
|
|
assert(Bits.size() == 64 && "Not 64 bits here?");
|
|
return Select64(N, LateMask, InstCnt);
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
SmallVector<ValueBit, 64> Bits;
|
|
|
|
bool HasZeros;
|
|
SmallVector<unsigned, 64> RLAmt;
|
|
|
|
SmallVector<BitGroup, 16> BitGroups;
|
|
|
|
DenseMap<std::pair<SDValue, unsigned>, ValueRotInfo> ValueRots;
|
|
SmallVector<ValueRotInfo, 16> ValueRotsVec;
|
|
|
|
SelectionDAG *CurDAG;
|
|
|
|
public:
|
|
BitPermutationSelector(SelectionDAG *DAG)
|
|
: CurDAG(DAG) {}
|
|
|
|
// Here we try to match complex bit permutations into a set of
|
|
// rotate-and-shift/shift/and/or instructions, using a set of heuristics
|
|
// known to produce optimial code for common cases (like i32 byte swapping).
|
|
SDNode *Select(SDNode *N) {
|
|
Bits.resize(N->getValueType(0).getSizeInBits());
|
|
if (!getValueBits(SDValue(N, 0), Bits))
|
|
return nullptr;
|
|
|
|
DEBUG(dbgs() << "Considering bit-permutation-based instruction"
|
|
" selection for: ");
|
|
DEBUG(N->dump(CurDAG));
|
|
|
|
// Fill it RLAmt and set HasZeros.
|
|
computeRotationAmounts();
|
|
|
|
if (!HasZeros)
|
|
return Select(N, false);
|
|
|
|
// We currently have two techniques for handling results with zeros: early
|
|
// masking (the default) and late masking. Late masking is sometimes more
|
|
// efficient, but because the structure of the bit groups is different, it
|
|
// is hard to tell without generating both and comparing the results. With
|
|
// late masking, we ignore zeros in the resulting value when inserting each
|
|
// set of bit groups, and then mask in the zeros at the end. With early
|
|
// masking, we only insert the non-zero parts of the result at every step.
|
|
|
|
unsigned InstCnt, InstCntLateMask;
|
|
DEBUG(dbgs() << "\tEarly masking:\n");
|
|
SDNode *RN = Select(N, false, &InstCnt);
|
|
DEBUG(dbgs() << "\t\tisel would use " << InstCnt << " instructions\n");
|
|
|
|
DEBUG(dbgs() << "\tLate masking:\n");
|
|
SDNode *RNLM = Select(N, true, &InstCntLateMask);
|
|
DEBUG(dbgs() << "\t\tisel would use " << InstCntLateMask <<
|
|
" instructions\n");
|
|
|
|
if (InstCnt <= InstCntLateMask) {
|
|
DEBUG(dbgs() << "\tUsing early-masking for isel\n");
|
|
return RN;
|
|
}
|
|
|
|
DEBUG(dbgs() << "\tUsing late-masking for isel\n");
|
|
return RNLM;
|
|
}
|
|
};
|
|
} // anonymous namespace
|
|
|
|
SDNode *PPCDAGToDAGISel::SelectBitPermutation(SDNode *N) {
|
|
if (N->getValueType(0) != MVT::i32 &&
|
|
N->getValueType(0) != MVT::i64)
|
|
return nullptr;
|
|
|
|
if (!UseBitPermRewriter)
|
|
return nullptr;
|
|
|
|
switch (N->getOpcode()) {
|
|
default: break;
|
|
case ISD::ROTL:
|
|
case ISD::SHL:
|
|
case ISD::SRL:
|
|
case ISD::AND:
|
|
case ISD::OR: {
|
|
BitPermutationSelector BPS(CurDAG);
|
|
return BPS.Select(N);
|
|
}
|
|
}
|
|
|
|
return nullptr;
|
|
}
|
|
|
|
/// SelectCC - Select a comparison of the specified values with the specified
|
|
/// condition code, returning the CR# of the expression.
|
|
SDValue PPCDAGToDAGISel::SelectCC(SDValue LHS, SDValue RHS,
|
|
ISD::CondCode CC, SDLoc dl) {
|
|
// Always select the LHS.
|
|
unsigned Opc;
|
|
|
|
if (LHS.getValueType() == MVT::i32) {
|
|
unsigned Imm;
|
|
if (CC == ISD::SETEQ || CC == ISD::SETNE) {
|
|
if (isInt32Immediate(RHS, Imm)) {
|
|
// SETEQ/SETNE comparison with 16-bit immediate, fold it.
|
|
if (isUInt<16>(Imm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
|
|
getI32Imm(Imm & 0xFFFF)), 0);
|
|
// If this is a 16-bit signed immediate, fold it.
|
|
if (isInt<16>((int)Imm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
|
|
getI32Imm(Imm & 0xFFFF)), 0);
|
|
|
|
// For non-equality comparisons, the default code would materialize the
|
|
// constant, then compare against it, like this:
|
|
// lis r2, 4660
|
|
// ori r2, r2, 22136
|
|
// cmpw cr0, r3, r2
|
|
// Since we are just comparing for equality, we can emit this instead:
|
|
// xoris r0,r3,0x1234
|
|
// cmplwi cr0,r0,0x5678
|
|
// beq cr0,L6
|
|
SDValue Xor(CurDAG->getMachineNode(PPC::XORIS, dl, MVT::i32, LHS,
|
|
getI32Imm(Imm >> 16)), 0);
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, Xor,
|
|
getI32Imm(Imm & 0xFFFF)), 0);
|
|
}
|
|
Opc = PPC::CMPLW;
|
|
} else if (ISD::isUnsignedIntSetCC(CC)) {
|
|
if (isInt32Immediate(RHS, Imm) && isUInt<16>(Imm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
|
|
getI32Imm(Imm & 0xFFFF)), 0);
|
|
Opc = PPC::CMPLW;
|
|
} else {
|
|
short SImm;
|
|
if (isIntS16Immediate(RHS, SImm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
|
|
getI32Imm((int)SImm & 0xFFFF)),
|
|
0);
|
|
Opc = PPC::CMPW;
|
|
}
|
|
} else if (LHS.getValueType() == MVT::i64) {
|
|
uint64_t Imm;
|
|
if (CC == ISD::SETEQ || CC == ISD::SETNE) {
|
|
if (isInt64Immediate(RHS.getNode(), Imm)) {
|
|
// SETEQ/SETNE comparison with 16-bit immediate, fold it.
|
|
if (isUInt<16>(Imm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
|
|
getI32Imm(Imm & 0xFFFF)), 0);
|
|
// If this is a 16-bit signed immediate, fold it.
|
|
if (isInt<16>(Imm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
|
|
getI32Imm(Imm & 0xFFFF)), 0);
|
|
|
|
// For non-equality comparisons, the default code would materialize the
|
|
// constant, then compare against it, like this:
|
|
// lis r2, 4660
|
|
// ori r2, r2, 22136
|
|
// cmpd cr0, r3, r2
|
|
// Since we are just comparing for equality, we can emit this instead:
|
|
// xoris r0,r3,0x1234
|
|
// cmpldi cr0,r0,0x5678
|
|
// beq cr0,L6
|
|
if (isUInt<32>(Imm)) {
|
|
SDValue Xor(CurDAG->getMachineNode(PPC::XORIS8, dl, MVT::i64, LHS,
|
|
getI64Imm(Imm >> 16)), 0);
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, Xor,
|
|
getI64Imm(Imm & 0xFFFF)), 0);
|
|
}
|
|
}
|
|
Opc = PPC::CMPLD;
|
|
} else if (ISD::isUnsignedIntSetCC(CC)) {
|
|
if (isInt64Immediate(RHS.getNode(), Imm) && isUInt<16>(Imm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
|
|
getI64Imm(Imm & 0xFFFF)), 0);
|
|
Opc = PPC::CMPLD;
|
|
} else {
|
|
short SImm;
|
|
if (isIntS16Immediate(RHS, SImm))
|
|
return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
|
|
getI64Imm(SImm & 0xFFFF)),
|
|
0);
|
|
Opc = PPC::CMPD;
|
|
}
|
|
} else if (LHS.getValueType() == MVT::f32) {
|
|
Opc = PPC::FCMPUS;
|
|
} else {
|
|
assert(LHS.getValueType() == MVT::f64 && "Unknown vt!");
|
|
Opc = PPCSubTarget->hasVSX() ? PPC::XSCMPUDP : PPC::FCMPUD;
|
|
}
|
|
return SDValue(CurDAG->getMachineNode(Opc, dl, MVT::i32, LHS, RHS), 0);
|
|
}
|
|
|
|
static PPC::Predicate getPredicateForSetCC(ISD::CondCode CC) {
|
|
switch (CC) {
|
|
case ISD::SETUEQ:
|
|
case ISD::SETONE:
|
|
case ISD::SETOLE:
|
|
case ISD::SETOGE:
|
|
llvm_unreachable("Should be lowered by legalize!");
|
|
default: llvm_unreachable("Unknown condition!");
|
|
case ISD::SETOEQ:
|
|
case ISD::SETEQ: return PPC::PRED_EQ;
|
|
case ISD::SETUNE:
|
|
case ISD::SETNE: return PPC::PRED_NE;
|
|
case ISD::SETOLT:
|
|
case ISD::SETLT: return PPC::PRED_LT;
|
|
case ISD::SETULE:
|
|
case ISD::SETLE: return PPC::PRED_LE;
|
|
case ISD::SETOGT:
|
|
case ISD::SETGT: return PPC::PRED_GT;
|
|
case ISD::SETUGE:
|
|
case ISD::SETGE: return PPC::PRED_GE;
|
|
case ISD::SETO: return PPC::PRED_NU;
|
|
case ISD::SETUO: return PPC::PRED_UN;
|
|
// These two are invalid for floating point. Assume we have int.
|
|
case ISD::SETULT: return PPC::PRED_LT;
|
|
case ISD::SETUGT: return PPC::PRED_GT;
|
|
}
|
|
}
|
|
|
|
/// getCRIdxForSetCC - Return the index of the condition register field
|
|
/// associated with the SetCC condition, and whether or not the field is
|
|
/// treated as inverted. That is, lt = 0; ge = 0 inverted.
|
|
static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool &Invert) {
|
|
Invert = false;
|
|
switch (CC) {
|
|
default: llvm_unreachable("Unknown condition!");
|
|
case ISD::SETOLT:
|
|
case ISD::SETLT: return 0; // Bit #0 = SETOLT
|
|
case ISD::SETOGT:
|
|
case ISD::SETGT: return 1; // Bit #1 = SETOGT
|
|
case ISD::SETOEQ:
|
|
case ISD::SETEQ: return 2; // Bit #2 = SETOEQ
|
|
case ISD::SETUO: return 3; // Bit #3 = SETUO
|
|
case ISD::SETUGE:
|
|
case ISD::SETGE: Invert = true; return 0; // !Bit #0 = SETUGE
|
|
case ISD::SETULE:
|
|
case ISD::SETLE: Invert = true; return 1; // !Bit #1 = SETULE
|
|
case ISD::SETUNE:
|
|
case ISD::SETNE: Invert = true; return 2; // !Bit #2 = SETUNE
|
|
case ISD::SETO: Invert = true; return 3; // !Bit #3 = SETO
|
|
case ISD::SETUEQ:
|
|
case ISD::SETOGE:
|
|
case ISD::SETOLE:
|
|
case ISD::SETONE:
|
|
llvm_unreachable("Invalid branch code: should be expanded by legalize");
|
|
// These are invalid for floating point. Assume integer.
|
|
case ISD::SETULT: return 0;
|
|
case ISD::SETUGT: return 1;
|
|
}
|
|
}
|
|
|
|
// getVCmpInst: return the vector compare instruction for the specified
|
|
// vector type and condition code. Since this is for altivec specific code,
|
|
// only support the altivec types (v16i8, v8i16, v4i32, and v4f32).
|
|
static unsigned int getVCmpInst(MVT VecVT, ISD::CondCode CC,
|
|
bool HasVSX, bool &Swap, bool &Negate) {
|
|
Swap = false;
|
|
Negate = false;
|
|
|
|
if (VecVT.isFloatingPoint()) {
|
|
/* Handle some cases by swapping input operands. */
|
|
switch (CC) {
|
|
case ISD::SETLE: CC = ISD::SETGE; Swap = true; break;
|
|
case ISD::SETLT: CC = ISD::SETGT; Swap = true; break;
|
|
case ISD::SETOLE: CC = ISD::SETOGE; Swap = true; break;
|
|
case ISD::SETOLT: CC = ISD::SETOGT; Swap = true; break;
|
|
case ISD::SETUGE: CC = ISD::SETULE; Swap = true; break;
|
|
case ISD::SETUGT: CC = ISD::SETULT; Swap = true; break;
|
|
default: break;
|
|
}
|
|
/* Handle some cases by negating the result. */
|
|
switch (CC) {
|
|
case ISD::SETNE: CC = ISD::SETEQ; Negate = true; break;
|
|
case ISD::SETUNE: CC = ISD::SETOEQ; Negate = true; break;
|
|
case ISD::SETULE: CC = ISD::SETOGT; Negate = true; break;
|
|
case ISD::SETULT: CC = ISD::SETOGE; Negate = true; break;
|
|
default: break;
|
|
}
|
|
/* We have instructions implementing the remaining cases. */
|
|
switch (CC) {
|
|
case ISD::SETEQ:
|
|
case ISD::SETOEQ:
|
|
if (VecVT == MVT::v4f32)
|
|
return HasVSX ? PPC::XVCMPEQSP : PPC::VCMPEQFP;
|
|
else if (VecVT == MVT::v2f64)
|
|
return PPC::XVCMPEQDP;
|
|
break;
|
|
case ISD::SETGT:
|
|
case ISD::SETOGT:
|
|
if (VecVT == MVT::v4f32)
|
|
return HasVSX ? PPC::XVCMPGTSP : PPC::VCMPGTFP;
|
|
else if (VecVT == MVT::v2f64)
|
|
return PPC::XVCMPGTDP;
|
|
break;
|
|
case ISD::SETGE:
|
|
case ISD::SETOGE:
|
|
if (VecVT == MVT::v4f32)
|
|
return HasVSX ? PPC::XVCMPGESP : PPC::VCMPGEFP;
|
|
else if (VecVT == MVT::v2f64)
|
|
return PPC::XVCMPGEDP;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
llvm_unreachable("Invalid floating-point vector compare condition");
|
|
} else {
|
|
/* Handle some cases by swapping input operands. */
|
|
switch (CC) {
|
|
case ISD::SETGE: CC = ISD::SETLE; Swap = true; break;
|
|
case ISD::SETLT: CC = ISD::SETGT; Swap = true; break;
|
|
case ISD::SETUGE: CC = ISD::SETULE; Swap = true; break;
|
|
case ISD::SETULT: CC = ISD::SETUGT; Swap = true; break;
|
|
default: break;
|
|
}
|
|
/* Handle some cases by negating the result. */
|
|
switch (CC) {
|
|
case ISD::SETNE: CC = ISD::SETEQ; Negate = true; break;
|
|
case ISD::SETUNE: CC = ISD::SETUEQ; Negate = true; break;
|
|
case ISD::SETLE: CC = ISD::SETGT; Negate = true; break;
|
|
case ISD::SETULE: CC = ISD::SETUGT; Negate = true; break;
|
|
default: break;
|
|
}
|
|
/* We have instructions implementing the remaining cases. */
|
|
switch (CC) {
|
|
case ISD::SETEQ:
|
|
case ISD::SETUEQ:
|
|
if (VecVT == MVT::v16i8)
|
|
return PPC::VCMPEQUB;
|
|
else if (VecVT == MVT::v8i16)
|
|
return PPC::VCMPEQUH;
|
|
else if (VecVT == MVT::v4i32)
|
|
return PPC::VCMPEQUW;
|
|
break;
|
|
case ISD::SETGT:
|
|
if (VecVT == MVT::v16i8)
|
|
return PPC::VCMPGTSB;
|
|
else if (VecVT == MVT::v8i16)
|
|
return PPC::VCMPGTSH;
|
|
else if (VecVT == MVT::v4i32)
|
|
return PPC::VCMPGTSW;
|
|
break;
|
|
case ISD::SETUGT:
|
|
if (VecVT == MVT::v16i8)
|
|
return PPC::VCMPGTUB;
|
|
else if (VecVT == MVT::v8i16)
|
|
return PPC::VCMPGTUH;
|
|
else if (VecVT == MVT::v4i32)
|
|
return PPC::VCMPGTUW;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
llvm_unreachable("Invalid integer vector compare condition");
|
|
}
|
|
}
|
|
|
|
SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
|
|
SDLoc dl(N);
|
|
unsigned Imm;
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
|
|
EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
|
|
bool isPPC64 = (PtrVT == MVT::i64);
|
|
|
|
if (!PPCSubTarget->useCRBits() &&
|
|
isInt32Immediate(N->getOperand(1), Imm)) {
|
|
// We can codegen setcc op, imm very efficiently compared to a brcond.
|
|
// Check for those cases here.
|
|
// setcc op, 0
|
|
if (Imm == 0) {
|
|
SDValue Op = N->getOperand(0);
|
|
switch (CC) {
|
|
default: break;
|
|
case ISD::SETEQ: {
|
|
Op = SDValue(CurDAG->getMachineNode(PPC::CNTLZW, dl, MVT::i32, Op), 0);
|
|
SDValue Ops[] = { Op, getI32Imm(27), getI32Imm(5), getI32Imm(31) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
case ISD::SETNE: {
|
|
if (isPPC64) break;
|
|
SDValue AD =
|
|
SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
|
|
Op, getI32Imm(~0U)), 0);
|
|
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op,
|
|
AD.getValue(1));
|
|
}
|
|
case ISD::SETLT: {
|
|
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
case ISD::SETGT: {
|
|
SDValue T =
|
|
SDValue(CurDAG->getMachineNode(PPC::NEG, dl, MVT::i32, Op), 0);
|
|
T = SDValue(CurDAG->getMachineNode(PPC::ANDC, dl, MVT::i32, T, Op), 0);
|
|
SDValue Ops[] = { T, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
}
|
|
} else if (Imm == ~0U) { // setcc op, -1
|
|
SDValue Op = N->getOperand(0);
|
|
switch (CC) {
|
|
default: break;
|
|
case ISD::SETEQ:
|
|
if (isPPC64) break;
|
|
Op = SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
|
|
Op, getI32Imm(1)), 0);
|
|
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
|
|
SDValue(CurDAG->getMachineNode(PPC::LI, dl,
|
|
MVT::i32,
|
|
getI32Imm(0)), 0),
|
|
Op.getValue(1));
|
|
case ISD::SETNE: {
|
|
if (isPPC64) break;
|
|
Op = SDValue(CurDAG->getMachineNode(PPC::NOR, dl, MVT::i32, Op, Op), 0);
|
|
SDNode *AD = CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
|
|
Op, getI32Imm(~0U));
|
|
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, SDValue(AD, 0),
|
|
Op, SDValue(AD, 1));
|
|
}
|
|
case ISD::SETLT: {
|
|
SDValue AD = SDValue(CurDAG->getMachineNode(PPC::ADDI, dl, MVT::i32, Op,
|
|
getI32Imm(1)), 0);
|
|
SDValue AN = SDValue(CurDAG->getMachineNode(PPC::AND, dl, MVT::i32, AD,
|
|
Op), 0);
|
|
SDValue Ops[] = { AN, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
case ISD::SETGT: {
|
|
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
|
|
Op = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops),
|
|
0);
|
|
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op,
|
|
getI32Imm(1));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
SDValue LHS = N->getOperand(0);
|
|
SDValue RHS = N->getOperand(1);
|
|
|
|
// Altivec Vector compare instructions do not set any CR register by default and
|
|
// vector compare operations return the same type as the operands.
|
|
if (LHS.getValueType().isVector()) {
|
|
EVT VecVT = LHS.getValueType();
|
|
bool Swap, Negate;
|
|
unsigned int VCmpInst = getVCmpInst(VecVT.getSimpleVT(), CC,
|
|
PPCSubTarget->hasVSX(), Swap, Negate);
|
|
if (Swap)
|
|
std::swap(LHS, RHS);
|
|
|
|
if (Negate) {
|
|
SDValue VCmp(CurDAG->getMachineNode(VCmpInst, dl, VecVT, LHS, RHS), 0);
|
|
return CurDAG->SelectNodeTo(N, PPCSubTarget->hasVSX() ? PPC::XXLNOR :
|
|
PPC::VNOR,
|
|
VecVT, VCmp, VCmp);
|
|
}
|
|
|
|
return CurDAG->SelectNodeTo(N, VCmpInst, VecVT, LHS, RHS);
|
|
}
|
|
|
|
if (PPCSubTarget->useCRBits())
|
|
return nullptr;
|
|
|
|
bool Inv;
|
|
unsigned Idx = getCRIdxForSetCC(CC, Inv);
|
|
SDValue CCReg = SelectCC(LHS, RHS, CC, dl);
|
|
SDValue IntCR;
|
|
|
|
// Force the ccreg into CR7.
|
|
SDValue CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32);
|
|
|
|
SDValue InFlag(nullptr, 0); // Null incoming flag value.
|
|
CCReg = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, CR7Reg, CCReg,
|
|
InFlag).getValue(1);
|
|
|
|
IntCR = SDValue(CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32, CR7Reg,
|
|
CCReg), 0);
|
|
|
|
SDValue Ops[] = { IntCR, getI32Imm((32-(3-Idx)) & 31),
|
|
getI32Imm(31), getI32Imm(31) };
|
|
if (!Inv)
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
|
|
// Get the specified bit.
|
|
SDValue Tmp =
|
|
SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops), 0);
|
|
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1));
|
|
}
|
|
|
|
|
|
// Select - Convert the specified operand from a target-independent to a
|
|
// target-specific node if it hasn't already been changed.
|
|
SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
|
|
SDLoc dl(N);
|
|
if (N->isMachineOpcode()) {
|
|
N->setNodeId(-1);
|
|
return nullptr; // Already selected.
|
|
}
|
|
|
|
// In case any misguided DAG-level optimizations form an ADD with a
|
|
// TargetConstant operand, crash here instead of miscompiling (by selecting
|
|
// an r+r add instead of some kind of r+i add).
|
|
if (N->getOpcode() == ISD::ADD &&
|
|
N->getOperand(1).getOpcode() == ISD::TargetConstant)
|
|
llvm_unreachable("Invalid ADD with TargetConstant operand");
|
|
|
|
// Try matching complex bit permutations before doing anything else.
|
|
if (SDNode *NN = SelectBitPermutation(N))
|
|
return NN;
|
|
|
|
switch (N->getOpcode()) {
|
|
default: break;
|
|
|
|
case ISD::Constant: {
|
|
if (N->getValueType(0) == MVT::i64)
|
|
return SelectInt64(CurDAG, N);
|
|
break;
|
|
}
|
|
|
|
case ISD::SETCC: {
|
|
SDNode *SN = SelectSETCC(N);
|
|
if (SN)
|
|
return SN;
|
|
break;
|
|
}
|
|
case PPCISD::GlobalBaseReg:
|
|
return getGlobalBaseReg();
|
|
|
|
case ISD::FrameIndex:
|
|
return getFrameIndex(N, N);
|
|
|
|
case PPCISD::MFOCRF: {
|
|
SDValue InFlag = N->getOperand(1);
|
|
return CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32,
|
|
N->getOperand(0), InFlag);
|
|
}
|
|
|
|
case PPCISD::READ_TIME_BASE: {
|
|
return CurDAG->getMachineNode(PPC::ReadTB, dl, MVT::i32, MVT::i32,
|
|
MVT::Other, N->getOperand(0));
|
|
}
|
|
|
|
case PPCISD::SRA_ADDZE: {
|
|
SDValue N0 = N->getOperand(0);
|
|
SDValue ShiftAmt =
|
|
CurDAG->getTargetConstant(*cast<ConstantSDNode>(N->getOperand(1))->
|
|
getConstantIntValue(), N->getValueType(0));
|
|
if (N->getValueType(0) == MVT::i64) {
|
|
SDNode *Op =
|
|
CurDAG->getMachineNode(PPC::SRADI, dl, MVT::i64, MVT::Glue,
|
|
N0, ShiftAmt);
|
|
return CurDAG->SelectNodeTo(N, PPC::ADDZE8, MVT::i64,
|
|
SDValue(Op, 0), SDValue(Op, 1));
|
|
} else {
|
|
assert(N->getValueType(0) == MVT::i32 &&
|
|
"Expecting i64 or i32 in PPCISD::SRA_ADDZE");
|
|
SDNode *Op =
|
|
CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Glue,
|
|
N0, ShiftAmt);
|
|
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
|
|
SDValue(Op, 0), SDValue(Op, 1));
|
|
}
|
|
}
|
|
|
|
case ISD::LOAD: {
|
|
// Handle preincrement loads.
|
|
LoadSDNode *LD = cast<LoadSDNode>(N);
|
|
EVT LoadedVT = LD->getMemoryVT();
|
|
|
|
// Normal loads are handled by code generated from the .td file.
|
|
if (LD->getAddressingMode() != ISD::PRE_INC)
|
|
break;
|
|
|
|
SDValue Offset = LD->getOffset();
|
|
if (Offset.getOpcode() == ISD::TargetConstant ||
|
|
Offset.getOpcode() == ISD::TargetGlobalAddress) {
|
|
|
|
unsigned Opcode;
|
|
bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
|
|
if (LD->getValueType(0) != MVT::i64) {
|
|
// Handle PPC32 integer and normal FP loads.
|
|
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
|
|
switch (LoadedVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Invalid PPC load type!");
|
|
case MVT::f64: Opcode = PPC::LFDU; break;
|
|
case MVT::f32: Opcode = PPC::LFSU; break;
|
|
case MVT::i32: Opcode = PPC::LWZU; break;
|
|
case MVT::i16: Opcode = isSExt ? PPC::LHAU : PPC::LHZU; break;
|
|
case MVT::i1:
|
|
case MVT::i8: Opcode = PPC::LBZU; break;
|
|
}
|
|
} else {
|
|
assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
|
|
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
|
|
switch (LoadedVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Invalid PPC load type!");
|
|
case MVT::i64: Opcode = PPC::LDU; break;
|
|
case MVT::i32: Opcode = PPC::LWZU8; break;
|
|
case MVT::i16: Opcode = isSExt ? PPC::LHAU8 : PPC::LHZU8; break;
|
|
case MVT::i1:
|
|
case MVT::i8: Opcode = PPC::LBZU8; break;
|
|
}
|
|
}
|
|
|
|
SDValue Chain = LD->getChain();
|
|
SDValue Base = LD->getBasePtr();
|
|
SDValue Ops[] = { Offset, Base, Chain };
|
|
return CurDAG->getMachineNode(Opcode, dl, LD->getValueType(0),
|
|
PPCLowering->getPointerTy(),
|
|
MVT::Other, Ops);
|
|
} else {
|
|
unsigned Opcode;
|
|
bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
|
|
if (LD->getValueType(0) != MVT::i64) {
|
|
// Handle PPC32 integer and normal FP loads.
|
|
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
|
|
switch (LoadedVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Invalid PPC load type!");
|
|
case MVT::f64: Opcode = PPC::LFDUX; break;
|
|
case MVT::f32: Opcode = PPC::LFSUX; break;
|
|
case MVT::i32: Opcode = PPC::LWZUX; break;
|
|
case MVT::i16: Opcode = isSExt ? PPC::LHAUX : PPC::LHZUX; break;
|
|
case MVT::i1:
|
|
case MVT::i8: Opcode = PPC::LBZUX; break;
|
|
}
|
|
} else {
|
|
assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
|
|
assert((!isSExt || LoadedVT == MVT::i16 || LoadedVT == MVT::i32) &&
|
|
"Invalid sext update load");
|
|
switch (LoadedVT.getSimpleVT().SimpleTy) {
|
|
default: llvm_unreachable("Invalid PPC load type!");
|
|
case MVT::i64: Opcode = PPC::LDUX; break;
|
|
case MVT::i32: Opcode = isSExt ? PPC::LWAUX : PPC::LWZUX8; break;
|
|
case MVT::i16: Opcode = isSExt ? PPC::LHAUX8 : PPC::LHZUX8; break;
|
|
case MVT::i1:
|
|
case MVT::i8: Opcode = PPC::LBZUX8; break;
|
|
}
|
|
}
|
|
|
|
SDValue Chain = LD->getChain();
|
|
SDValue Base = LD->getBasePtr();
|
|
SDValue Ops[] = { Base, Offset, Chain };
|
|
return CurDAG->getMachineNode(Opcode, dl, LD->getValueType(0),
|
|
PPCLowering->getPointerTy(),
|
|
MVT::Other, Ops);
|
|
}
|
|
}
|
|
|
|
case ISD::AND: {
|
|
unsigned Imm, Imm2, SH, MB, ME;
|
|
uint64_t Imm64;
|
|
|
|
// If this is an and of a value rotated between 0 and 31 bits and then and'd
|
|
// with a mask, emit rlwinm
|
|
if (isInt32Immediate(N->getOperand(1), Imm) &&
|
|
isRotateAndMask(N->getOperand(0).getNode(), Imm, false, SH, MB, ME)) {
|
|
SDValue Val = N->getOperand(0).getOperand(0);
|
|
SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
// If this is just a masked value where the input is not handled above, and
|
|
// is not a rotate-left (handled by a pattern in the .td file), emit rlwinm
|
|
if (isInt32Immediate(N->getOperand(1), Imm) &&
|
|
isRunOfOnes(Imm, MB, ME) &&
|
|
N->getOperand(0).getOpcode() != ISD::ROTL) {
|
|
SDValue Val = N->getOperand(0);
|
|
SDValue Ops[] = { Val, getI32Imm(0), getI32Imm(MB), getI32Imm(ME) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
// If this is a 64-bit zero-extension mask, emit rldicl.
|
|
if (isInt64Immediate(N->getOperand(1).getNode(), Imm64) &&
|
|
isMask_64(Imm64)) {
|
|
SDValue Val = N->getOperand(0);
|
|
MB = 64 - countTrailingOnes(Imm64);
|
|
SH = 0;
|
|
|
|
// If the operand is a logical right shift, we can fold it into this
|
|
// instruction: rldicl(rldicl(x, 64-n, n), 0, mb) -> rldicl(x, 64-n, mb)
|
|
// for n <= mb. The right shift is really a left rotate followed by a
|
|
// mask, and this mask is a more-restrictive sub-mask of the mask implied
|
|
// by the shift.
|
|
if (Val.getOpcode() == ISD::SRL &&
|
|
isInt32Immediate(Val.getOperand(1).getNode(), Imm) && Imm <= MB) {
|
|
assert(Imm < 64 && "Illegal shift amount");
|
|
Val = Val.getOperand(0);
|
|
SH = 64 - Imm;
|
|
}
|
|
|
|
SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLDICL, MVT::i64, Ops);
|
|
}
|
|
// AND X, 0 -> 0, not "rlwinm 32".
|
|
if (isInt32Immediate(N->getOperand(1), Imm) && (Imm == 0)) {
|
|
ReplaceUses(SDValue(N, 0), N->getOperand(1));
|
|
return nullptr;
|
|
}
|
|
// ISD::OR doesn't get all the bitfield insertion fun.
|
|
// (and (or x, c1), c2) where isRunOfOnes(~(c1^c2)) is a bitfield insert
|
|
if (isInt32Immediate(N->getOperand(1), Imm) &&
|
|
N->getOperand(0).getOpcode() == ISD::OR &&
|
|
isInt32Immediate(N->getOperand(0).getOperand(1), Imm2)) {
|
|
unsigned MB, ME;
|
|
Imm = ~(Imm^Imm2);
|
|
if (isRunOfOnes(Imm, MB, ME)) {
|
|
SDValue Ops[] = { N->getOperand(0).getOperand(0),
|
|
N->getOperand(0).getOperand(1),
|
|
getI32Imm(0), getI32Imm(MB),getI32Imm(ME) };
|
|
return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops);
|
|
}
|
|
}
|
|
|
|
// Other cases are autogenerated.
|
|
break;
|
|
}
|
|
case ISD::OR: {
|
|
if (N->getValueType(0) == MVT::i32)
|
|
if (SDNode *I = SelectBitfieldInsert(N))
|
|
return I;
|
|
|
|
short Imm;
|
|
if (N->getOperand(0)->getOpcode() == ISD::FrameIndex &&
|
|
isIntS16Immediate(N->getOperand(1), Imm)) {
|
|
APInt LHSKnownZero, LHSKnownOne;
|
|
CurDAG->computeKnownBits(N->getOperand(0), LHSKnownZero, LHSKnownOne);
|
|
|
|
// If this is equivalent to an add, then we can fold it with the
|
|
// FrameIndex calculation.
|
|
if ((LHSKnownZero.getZExtValue()|~(uint64_t)Imm) == ~0ULL)
|
|
return getFrameIndex(N, N->getOperand(0).getNode(), (int)Imm);
|
|
}
|
|
|
|
// Other cases are autogenerated.
|
|
break;
|
|
}
|
|
case ISD::ADD: {
|
|
short Imm;
|
|
if (N->getOperand(0)->getOpcode() == ISD::FrameIndex &&
|
|
isIntS16Immediate(N->getOperand(1), Imm))
|
|
return getFrameIndex(N, N->getOperand(0).getNode(), (int)Imm);
|
|
|
|
break;
|
|
}
|
|
case ISD::SHL: {
|
|
unsigned Imm, SH, MB, ME;
|
|
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
|
|
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
|
|
SDValue Ops[] = { N->getOperand(0).getOperand(0),
|
|
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
|
|
// Other cases are autogenerated.
|
|
break;
|
|
}
|
|
case ISD::SRL: {
|
|
unsigned Imm, SH, MB, ME;
|
|
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
|
|
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
|
|
SDValue Ops[] = { N->getOperand(0).getOperand(0),
|
|
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
|
|
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops);
|
|
}
|
|
|
|
// Other cases are autogenerated.
|
|
break;
|
|
}
|
|
// FIXME: Remove this once the ANDI glue bug is fixed:
|
|
case PPCISD::ANDIo_1_EQ_BIT:
|
|
case PPCISD::ANDIo_1_GT_BIT: {
|
|
if (!ANDIGlueBug)
|
|
break;
|
|
|
|
EVT InVT = N->getOperand(0).getValueType();
|
|
assert((InVT == MVT::i64 || InVT == MVT::i32) &&
|
|
"Invalid input type for ANDIo_1_EQ_BIT");
|
|
|
|
unsigned Opcode = (InVT == MVT::i64) ? PPC::ANDIo8 : PPC::ANDIo;
|
|
SDValue AndI(CurDAG->getMachineNode(Opcode, dl, InVT, MVT::Glue,
|
|
N->getOperand(0),
|
|
CurDAG->getTargetConstant(1, InVT)), 0);
|
|
SDValue CR0Reg = CurDAG->getRegister(PPC::CR0, MVT::i32);
|
|
SDValue SRIdxVal =
|
|
CurDAG->getTargetConstant(N->getOpcode() == PPCISD::ANDIo_1_EQ_BIT ?
|
|
PPC::sub_eq : PPC::sub_gt, MVT::i32);
|
|
|
|
return CurDAG->SelectNodeTo(N, TargetOpcode::EXTRACT_SUBREG, MVT::i1,
|
|
CR0Reg, SRIdxVal,
|
|
SDValue(AndI.getNode(), 1) /* glue */);
|
|
}
|
|
case ISD::SELECT_CC: {
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
|
|
EVT PtrVT = CurDAG->getTargetLoweringInfo().getPointerTy();
|
|
bool isPPC64 = (PtrVT == MVT::i64);
|
|
|
|
// If this is a select of i1 operands, we'll pattern match it.
|
|
if (PPCSubTarget->useCRBits() &&
|
|
N->getOperand(0).getValueType() == MVT::i1)
|
|
break;
|
|
|
|
// Handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
|
|
if (!isPPC64)
|
|
if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
|
|
if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
|
|
if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
|
|
if (N1C->isNullValue() && N3C->isNullValue() &&
|
|
N2C->getZExtValue() == 1ULL && CC == ISD::SETNE &&
|
|
// FIXME: Implement this optzn for PPC64.
|
|
N->getValueType(0) == MVT::i32) {
|
|
SDNode *Tmp =
|
|
CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Glue,
|
|
N->getOperand(0), getI32Imm(~0U));
|
|
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32,
|
|
SDValue(Tmp, 0), N->getOperand(0),
|
|
SDValue(Tmp, 1));
|
|
}
|
|
|
|
SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
|
|
|
|
if (N->getValueType(0) == MVT::i1) {
|
|
// An i1 select is: (c & t) | (!c & f).
|
|
bool Inv;
|
|
unsigned Idx = getCRIdxForSetCC(CC, Inv);
|
|
|
|
unsigned SRI;
|
|
switch (Idx) {
|
|
default: llvm_unreachable("Invalid CC index");
|
|
case 0: SRI = PPC::sub_lt; break;
|
|
case 1: SRI = PPC::sub_gt; break;
|
|
case 2: SRI = PPC::sub_eq; break;
|
|
case 3: SRI = PPC::sub_un; break;
|
|
}
|
|
|
|
SDValue CCBit = CurDAG->getTargetExtractSubreg(SRI, dl, MVT::i1, CCReg);
|
|
|
|
SDValue NotCCBit(CurDAG->getMachineNode(PPC::CRNOR, dl, MVT::i1,
|
|
CCBit, CCBit), 0);
|
|
SDValue C = Inv ? NotCCBit : CCBit,
|
|
NotC = Inv ? CCBit : NotCCBit;
|
|
|
|
SDValue CAndT(CurDAG->getMachineNode(PPC::CRAND, dl, MVT::i1,
|
|
C, N->getOperand(2)), 0);
|
|
SDValue NotCAndF(CurDAG->getMachineNode(PPC::CRAND, dl, MVT::i1,
|
|
NotC, N->getOperand(3)), 0);
|
|
|
|
return CurDAG->SelectNodeTo(N, PPC::CROR, MVT::i1, CAndT, NotCAndF);
|
|
}
|
|
|
|
unsigned BROpc = getPredicateForSetCC(CC);
|
|
|
|
unsigned SelectCCOp;
|
|
if (N->getValueType(0) == MVT::i32)
|
|
SelectCCOp = PPC::SELECT_CC_I4;
|
|
else if (N->getValueType(0) == MVT::i64)
|
|
SelectCCOp = PPC::SELECT_CC_I8;
|
|
else if (N->getValueType(0) == MVT::f32)
|
|
SelectCCOp = PPC::SELECT_CC_F4;
|
|
else if (N->getValueType(0) == MVT::f64)
|
|
if (PPCSubTarget->hasVSX())
|
|
SelectCCOp = PPC::SELECT_CC_VSFRC;
|
|
else
|
|
SelectCCOp = PPC::SELECT_CC_F8;
|
|
else if (N->getValueType(0) == MVT::v2f64 ||
|
|
N->getValueType(0) == MVT::v2i64)
|
|
SelectCCOp = PPC::SELECT_CC_VSRC;
|
|
else
|
|
SelectCCOp = PPC::SELECT_CC_VRRC;
|
|
|
|
SDValue Ops[] = { CCReg, N->getOperand(2), N->getOperand(3),
|
|
getI32Imm(BROpc) };
|
|
return CurDAG->SelectNodeTo(N, SelectCCOp, N->getValueType(0), Ops);
|
|
}
|
|
case ISD::VSELECT:
|
|
if (PPCSubTarget->hasVSX()) {
|
|
SDValue Ops[] = { N->getOperand(2), N->getOperand(1), N->getOperand(0) };
|
|
return CurDAG->SelectNodeTo(N, PPC::XXSEL, N->getValueType(0), Ops);
|
|
}
|
|
|
|
break;
|
|
case ISD::VECTOR_SHUFFLE:
|
|
if (PPCSubTarget->hasVSX() && (N->getValueType(0) == MVT::v2f64 ||
|
|
N->getValueType(0) == MVT::v2i64)) {
|
|
ShuffleVectorSDNode *SVN = cast<ShuffleVectorSDNode>(N);
|
|
|
|
SDValue Op1 = N->getOperand(SVN->getMaskElt(0) < 2 ? 0 : 1),
|
|
Op2 = N->getOperand(SVN->getMaskElt(1) < 2 ? 0 : 1);
|
|
unsigned DM[2];
|
|
|
|
for (int i = 0; i < 2; ++i)
|
|
if (SVN->getMaskElt(i) <= 0 || SVN->getMaskElt(i) == 2)
|
|
DM[i] = 0;
|
|
else
|
|
DM[i] = 1;
|
|
|
|
// For little endian, we must swap the input operands and adjust
|
|
// the mask elements (reverse and invert them).
|
|
if (PPCSubTarget->isLittleEndian()) {
|
|
std::swap(Op1, Op2);
|
|
unsigned tmp = DM[0];
|
|
DM[0] = 1 - DM[1];
|
|
DM[1] = 1 - tmp;
|
|
}
|
|
|
|
SDValue DMV = CurDAG->getTargetConstant(DM[1] | (DM[0] << 1), MVT::i32);
|
|
|
|
if (Op1 == Op2 && DM[0] == 0 && DM[1] == 0 &&
|
|
Op1.getOpcode() == ISD::SCALAR_TO_VECTOR &&
|
|
isa<LoadSDNode>(Op1.getOperand(0))) {
|
|
LoadSDNode *LD = cast<LoadSDNode>(Op1.getOperand(0));
|
|
SDValue Base, Offset;
|
|
|
|
if (LD->isUnindexed() &&
|
|
SelectAddrIdxOnly(LD->getBasePtr(), Base, Offset)) {
|
|
SDValue Chain = LD->getChain();
|
|
SDValue Ops[] = { Base, Offset, Chain };
|
|
return CurDAG->SelectNodeTo(N, PPC::LXVDSX,
|
|
N->getValueType(0), Ops);
|
|
}
|
|
}
|
|
|
|
SDValue Ops[] = { Op1, Op2, DMV };
|
|
return CurDAG->SelectNodeTo(N, PPC::XXPERMDI, N->getValueType(0), Ops);
|
|
}
|
|
|
|
break;
|
|
case PPCISD::BDNZ:
|
|
case PPCISD::BDZ: {
|
|
bool IsPPC64 = PPCSubTarget->isPPC64();
|
|
SDValue Ops[] = { N->getOperand(1), N->getOperand(0) };
|
|
return CurDAG->SelectNodeTo(N, N->getOpcode() == PPCISD::BDNZ ?
|
|
(IsPPC64 ? PPC::BDNZ8 : PPC::BDNZ) :
|
|
(IsPPC64 ? PPC::BDZ8 : PPC::BDZ),
|
|
MVT::Other, Ops);
|
|
}
|
|
case PPCISD::COND_BRANCH: {
|
|
// Op #0 is the Chain.
|
|
// Op #1 is the PPC::PRED_* number.
|
|
// Op #2 is the CR#
|
|
// Op #3 is the Dest MBB
|
|
// Op #4 is the Flag.
|
|
// Prevent PPC::PRED_* from being selected into LI.
|
|
SDValue Pred =
|
|
getI32Imm(cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
|
|
SDValue Ops[] = { Pred, N->getOperand(2), N->getOperand(3),
|
|
N->getOperand(0), N->getOperand(4) };
|
|
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops);
|
|
}
|
|
case ISD::BR_CC: {
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
|
|
unsigned PCC = getPredicateForSetCC(CC);
|
|
|
|
if (N->getOperand(2).getValueType() == MVT::i1) {
|
|
unsigned Opc;
|
|
bool Swap;
|
|
switch (PCC) {
|
|
default: llvm_unreachable("Unexpected Boolean-operand predicate");
|
|
case PPC::PRED_LT: Opc = PPC::CRANDC; Swap = true; break;
|
|
case PPC::PRED_LE: Opc = PPC::CRORC; Swap = true; break;
|
|
case PPC::PRED_EQ: Opc = PPC::CREQV; Swap = false; break;
|
|
case PPC::PRED_GE: Opc = PPC::CRORC; Swap = false; break;
|
|
case PPC::PRED_GT: Opc = PPC::CRANDC; Swap = false; break;
|
|
case PPC::PRED_NE: Opc = PPC::CRXOR; Swap = false; break;
|
|
}
|
|
|
|
SDValue BitComp(CurDAG->getMachineNode(Opc, dl, MVT::i1,
|
|
N->getOperand(Swap ? 3 : 2),
|
|
N->getOperand(Swap ? 2 : 3)), 0);
|
|
return CurDAG->SelectNodeTo(N, PPC::BC, MVT::Other,
|
|
BitComp, N->getOperand(4), N->getOperand(0));
|
|
}
|
|
|
|
SDValue CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC, dl);
|
|
SDValue Ops[] = { getI32Imm(PCC), CondCode,
|
|
N->getOperand(4), N->getOperand(0) };
|
|
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops);
|
|
}
|
|
case ISD::BRIND: {
|
|
// FIXME: Should custom lower this.
|
|
SDValue Chain = N->getOperand(0);
|
|
SDValue Target = N->getOperand(1);
|
|
unsigned Opc = Target.getValueType() == MVT::i32 ? PPC::MTCTR : PPC::MTCTR8;
|
|
unsigned Reg = Target.getValueType() == MVT::i32 ? PPC::BCTR : PPC::BCTR8;
|
|
Chain = SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Glue, Target,
|
|
Chain), 0);
|
|
return CurDAG->SelectNodeTo(N, Reg, MVT::Other, Chain);
|
|
}
|
|
case PPCISD::TOC_ENTRY: {
|
|
assert ((PPCSubTarget->isPPC64() || PPCSubTarget->isSVR4ABI()) &&
|
|
"Only supported for 64-bit ABI and 32-bit SVR4");
|
|
if (PPCSubTarget->isSVR4ABI() && !PPCSubTarget->isPPC64()) {
|
|
SDValue GA = N->getOperand(0);
|
|
return CurDAG->getMachineNode(PPC::LWZtoc, dl, MVT::i32, GA,
|
|
N->getOperand(1));
|
|
}
|
|
|
|
// For medium and large code model, we generate two instructions as
|
|
// described below. Otherwise we allow SelectCodeCommon to handle this,
|
|
// selecting one of LDtoc, LDtocJTI, LDtocCPT, and LDtocBA.
|
|
CodeModel::Model CModel = TM.getCodeModel();
|
|
if (CModel != CodeModel::Medium && CModel != CodeModel::Large)
|
|
break;
|
|
|
|
// The first source operand is a TargetGlobalAddress or a TargetJumpTable.
|
|
// If it is an externally defined symbol, a symbol with common linkage,
|
|
// a non-local function address, or a jump table address, or if we are
|
|
// generating code for large code model, we generate:
|
|
// LDtocL(<ga:@sym>, ADDIStocHA(%X2, <ga:@sym>))
|
|
// Otherwise we generate:
|
|
// ADDItocL(ADDIStocHA(%X2, <ga:@sym>), <ga:@sym>)
|
|
SDValue GA = N->getOperand(0);
|
|
SDValue TOCbase = N->getOperand(1);
|
|
SDNode *Tmp = CurDAG->getMachineNode(PPC::ADDIStocHA, dl, MVT::i64,
|
|
TOCbase, GA);
|
|
|
|
if (isa<JumpTableSDNode>(GA) || isa<BlockAddressSDNode>(GA) ||
|
|
CModel == CodeModel::Large)
|
|
return CurDAG->getMachineNode(PPC::LDtocL, dl, MVT::i64, GA,
|
|
SDValue(Tmp, 0));
|
|
|
|
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(GA)) {
|
|
const GlobalValue *GValue = G->getGlobal();
|
|
if ((GValue->getType()->getElementType()->isFunctionTy() &&
|
|
(GValue->isDeclaration() || GValue->isWeakForLinker())) ||
|
|
GValue->isDeclaration() || GValue->hasCommonLinkage() ||
|
|
GValue->hasAvailableExternallyLinkage())
|
|
return CurDAG->getMachineNode(PPC::LDtocL, dl, MVT::i64, GA,
|
|
SDValue(Tmp, 0));
|
|
}
|
|
|
|
return CurDAG->getMachineNode(PPC::ADDItocL, dl, MVT::i64,
|
|
SDValue(Tmp, 0), GA);
|
|
}
|
|
case PPCISD::PPC32_PICGOT: {
|
|
// Generate a PIC-safe GOT reference.
|
|
assert(!PPCSubTarget->isPPC64() && PPCSubTarget->isSVR4ABI() &&
|
|
"PPCISD::PPC32_PICGOT is only supported for 32-bit SVR4");
|
|
return CurDAG->SelectNodeTo(N, PPC::PPC32PICGOT, PPCLowering->getPointerTy(), MVT::i32);
|
|
}
|
|
case PPCISD::VADD_SPLAT: {
|
|
// This expands into one of three sequences, depending on whether
|
|
// the first operand is odd or even, positive or negative.
|
|
assert(isa<ConstantSDNode>(N->getOperand(0)) &&
|
|
isa<ConstantSDNode>(N->getOperand(1)) &&
|
|
"Invalid operand on VADD_SPLAT!");
|
|
|
|
int Elt = N->getConstantOperandVal(0);
|
|
int EltSize = N->getConstantOperandVal(1);
|
|
unsigned Opc1, Opc2, Opc3;
|
|
EVT VT;
|
|
|
|
if (EltSize == 1) {
|
|
Opc1 = PPC::VSPLTISB;
|
|
Opc2 = PPC::VADDUBM;
|
|
Opc3 = PPC::VSUBUBM;
|
|
VT = MVT::v16i8;
|
|
} else if (EltSize == 2) {
|
|
Opc1 = PPC::VSPLTISH;
|
|
Opc2 = PPC::VADDUHM;
|
|
Opc3 = PPC::VSUBUHM;
|
|
VT = MVT::v8i16;
|
|
} else {
|
|
assert(EltSize == 4 && "Invalid element size on VADD_SPLAT!");
|
|
Opc1 = PPC::VSPLTISW;
|
|
Opc2 = PPC::VADDUWM;
|
|
Opc3 = PPC::VSUBUWM;
|
|
VT = MVT::v4i32;
|
|
}
|
|
|
|
if ((Elt & 1) == 0) {
|
|
// Elt is even, in the range [-32,-18] + [16,30].
|
|
//
|
|
// Convert: VADD_SPLAT elt, size
|
|
// Into: tmp = VSPLTIS[BHW] elt
|
|
// VADDU[BHW]M tmp, tmp
|
|
// Where: [BHW] = B for size = 1, H for size = 2, W for size = 4
|
|
SDValue EltVal = getI32Imm(Elt >> 1);
|
|
SDNode *Tmp = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
|
|
SDValue TmpVal = SDValue(Tmp, 0);
|
|
return CurDAG->getMachineNode(Opc2, dl, VT, TmpVal, TmpVal);
|
|
|
|
} else if (Elt > 0) {
|
|
// Elt is odd and positive, in the range [17,31].
|
|
//
|
|
// Convert: VADD_SPLAT elt, size
|
|
// Into: tmp1 = VSPLTIS[BHW] elt-16
|
|
// tmp2 = VSPLTIS[BHW] -16
|
|
// VSUBU[BHW]M tmp1, tmp2
|
|
SDValue EltVal = getI32Imm(Elt - 16);
|
|
SDNode *Tmp1 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
|
|
EltVal = getI32Imm(-16);
|
|
SDNode *Tmp2 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
|
|
return CurDAG->getMachineNode(Opc3, dl, VT, SDValue(Tmp1, 0),
|
|
SDValue(Tmp2, 0));
|
|
|
|
} else {
|
|
// Elt is odd and negative, in the range [-31,-17].
|
|
//
|
|
// Convert: VADD_SPLAT elt, size
|
|
// Into: tmp1 = VSPLTIS[BHW] elt+16
|
|
// tmp2 = VSPLTIS[BHW] -16
|
|
// VADDU[BHW]M tmp1, tmp2
|
|
SDValue EltVal = getI32Imm(Elt + 16);
|
|
SDNode *Tmp1 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
|
|
EltVal = getI32Imm(-16);
|
|
SDNode *Tmp2 = CurDAG->getMachineNode(Opc1, dl, VT, EltVal);
|
|
return CurDAG->getMachineNode(Opc2, dl, VT, SDValue(Tmp1, 0),
|
|
SDValue(Tmp2, 0));
|
|
}
|
|
}
|
|
}
|
|
|
|
return SelectCode(N);
|
|
}
|
|
|
|
// If the target supports the cmpb instruction, do the idiom recognition here.
|
|
// We don't do this as a DAG combine because we don't want to do it as nodes
|
|
// are being combined (because we might miss part of the eventual idiom). We
|
|
// don't want to do it during instruction selection because we want to reuse
|
|
// the logic for lowering the masking operations already part of the
|
|
// instruction selector.
|
|
SDValue PPCDAGToDAGISel::combineToCMPB(SDNode *N) {
|
|
SDLoc dl(N);
|
|
|
|
assert(N->getOpcode() == ISD::OR &&
|
|
"Only OR nodes are supported for CMPB");
|
|
|
|
SDValue Res;
|
|
if (!PPCSubTarget->hasCMPB())
|
|
return Res;
|
|
|
|
if (N->getValueType(0) != MVT::i32 &&
|
|
N->getValueType(0) != MVT::i64)
|
|
return Res;
|
|
|
|
EVT VT = N->getValueType(0);
|
|
|
|
SDValue RHS, LHS;
|
|
bool BytesFound[8] = { 0, 0, 0, 0, 0, 0, 0, 0 };
|
|
uint64_t Mask = 0, Alt = 0;
|
|
|
|
auto IsByteSelectCC = [this](SDValue O, unsigned &b,
|
|
uint64_t &Mask, uint64_t &Alt,
|
|
SDValue &LHS, SDValue &RHS) {
|
|
if (O.getOpcode() != ISD::SELECT_CC)
|
|
return false;
|
|
ISD::CondCode CC = cast<CondCodeSDNode>(O.getOperand(4))->get();
|
|
|
|
if (!isa<ConstantSDNode>(O.getOperand(2)) ||
|
|
!isa<ConstantSDNode>(O.getOperand(3)))
|
|
return false;
|
|
|
|
uint64_t PM = O.getConstantOperandVal(2);
|
|
uint64_t PAlt = O.getConstantOperandVal(3);
|
|
for (b = 0; b < 8; ++b) {
|
|
uint64_t Mask = UINT64_C(0xFF) << (8*b);
|
|
if (PM && (PM & Mask) == PM && (PAlt & Mask) == PAlt)
|
|
break;
|
|
}
|
|
|
|
if (b == 8)
|
|
return false;
|
|
Mask |= PM;
|
|
Alt |= PAlt;
|
|
|
|
if (!isa<ConstantSDNode>(O.getOperand(1)) ||
|
|
O.getConstantOperandVal(1) != 0) {
|
|
SDValue Op0 = O.getOperand(0), Op1 = O.getOperand(1);
|
|
if (Op0.getOpcode() == ISD::TRUNCATE)
|
|
Op0 = Op0.getOperand(0);
|
|
if (Op1.getOpcode() == ISD::TRUNCATE)
|
|
Op1 = Op1.getOperand(0);
|
|
|
|
if (Op0.getOpcode() == ISD::SRL && Op1.getOpcode() == ISD::SRL &&
|
|
Op0.getOperand(1) == Op1.getOperand(1) && CC == ISD::SETEQ &&
|
|
isa<ConstantSDNode>(Op0.getOperand(1))) {
|
|
|
|
unsigned Bits = Op0.getValueType().getSizeInBits();
|
|
if (b != Bits/8-1)
|
|
return false;
|
|
if (Op0.getConstantOperandVal(1) != Bits-8)
|
|
return false;
|
|
|
|
LHS = Op0.getOperand(0);
|
|
RHS = Op1.getOperand(0);
|
|
return true;
|
|
}
|
|
|
|
// When we have small integers (i16 to be specific), the form present
|
|
// post-legalization uses SETULT in the SELECT_CC for the
|
|
// higher-order byte, depending on the fact that the
|
|
// even-higher-order bytes are known to all be zero, for example:
|
|
// select_cc (xor $lhs, $rhs), 256, 65280, 0, setult
|
|
// (so when the second byte is the same, because all higher-order
|
|
// bits from bytes 3 and 4 are known to be zero, the result of the
|
|
// xor can be at most 255)
|
|
if (Op0.getOpcode() == ISD::XOR && CC == ISD::SETULT &&
|
|
isa<ConstantSDNode>(O.getOperand(1))) {
|
|
|
|
uint64_t ULim = O.getConstantOperandVal(1);
|
|
if (ULim != (UINT64_C(1) << b*8))
|
|
return false;
|
|
|
|
// Now we need to make sure that the upper bytes are known to be
|
|
// zero.
|
|
unsigned Bits = Op0.getValueType().getSizeInBits();
|
|
if (!CurDAG->MaskedValueIsZero(Op0,
|
|
APInt::getHighBitsSet(Bits, Bits - (b+1)*8)))
|
|
return false;
|
|
|
|
LHS = Op0.getOperand(0);
|
|
RHS = Op0.getOperand(1);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
if (CC != ISD::SETEQ)
|
|
return false;
|
|
|
|
SDValue Op = O.getOperand(0);
|
|
if (Op.getOpcode() == ISD::AND) {
|
|
if (!isa<ConstantSDNode>(Op.getOperand(1)))
|
|
return false;
|
|
if (Op.getConstantOperandVal(1) != (UINT64_C(0xFF) << (8*b)))
|
|
return false;
|
|
|
|
SDValue XOR = Op.getOperand(0);
|
|
if (XOR.getOpcode() == ISD::TRUNCATE)
|
|
XOR = XOR.getOperand(0);
|
|
if (XOR.getOpcode() != ISD::XOR)
|
|
return false;
|
|
|
|
LHS = XOR.getOperand(0);
|
|
RHS = XOR.getOperand(1);
|
|
return true;
|
|
} else if (Op.getOpcode() == ISD::SRL) {
|
|
if (!isa<ConstantSDNode>(Op.getOperand(1)))
|
|
return false;
|
|
unsigned Bits = Op.getValueType().getSizeInBits();
|
|
if (b != Bits/8-1)
|
|
return false;
|
|
if (Op.getConstantOperandVal(1) != Bits-8)
|
|
return false;
|
|
|
|
SDValue XOR = Op.getOperand(0);
|
|
if (XOR.getOpcode() == ISD::TRUNCATE)
|
|
XOR = XOR.getOperand(0);
|
|
if (XOR.getOpcode() != ISD::XOR)
|
|
return false;
|
|
|
|
LHS = XOR.getOperand(0);
|
|
RHS = XOR.getOperand(1);
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
};
|
|
|
|
SmallVector<SDValue, 8> Queue(1, SDValue(N, 0));
|
|
while (!Queue.empty()) {
|
|
SDValue V = Queue.pop_back_val();
|
|
|
|
for (const SDValue &O : V.getNode()->ops()) {
|
|
unsigned b;
|
|
uint64_t M = 0, A = 0;
|
|
SDValue OLHS, ORHS;
|
|
if (O.getOpcode() == ISD::OR) {
|
|
Queue.push_back(O);
|
|
} else if (IsByteSelectCC(O, b, M, A, OLHS, ORHS)) {
|
|
if (!LHS) {
|
|
LHS = OLHS;
|
|
RHS = ORHS;
|
|
BytesFound[b] = true;
|
|
Mask |= M;
|
|
Alt |= A;
|
|
} else if ((LHS == ORHS && RHS == OLHS) ||
|
|
(RHS == ORHS && LHS == OLHS)) {
|
|
BytesFound[b] = true;
|
|
Mask |= M;
|
|
Alt |= A;
|
|
} else {
|
|
return Res;
|
|
}
|
|
} else {
|
|
return Res;
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned LastB = 0, BCnt = 0;
|
|
for (unsigned i = 0; i < 8; ++i)
|
|
if (BytesFound[LastB]) {
|
|
++BCnt;
|
|
LastB = i;
|
|
}
|
|
|
|
if (!LastB || BCnt < 2)
|
|
return Res;
|
|
|
|
// Because we'll be zero-extending the output anyway if don't have a specific
|
|
// value for each input byte (via the Mask), we can 'anyext' the inputs.
|
|
if (LHS.getValueType() != VT) {
|
|
LHS = CurDAG->getAnyExtOrTrunc(LHS, dl, VT);
|
|
RHS = CurDAG->getAnyExtOrTrunc(RHS, dl, VT);
|
|
}
|
|
|
|
Res = CurDAG->getNode(PPCISD::CMPB, dl, VT, LHS, RHS);
|
|
|
|
bool NonTrivialMask = ((int64_t) Mask) != INT64_C(-1);
|
|
if (NonTrivialMask && !Alt) {
|
|
// Res = Mask & CMPB
|
|
Res = CurDAG->getNode(ISD::AND, dl, VT, Res, CurDAG->getConstant(Mask, VT));
|
|
} else if (Alt) {
|
|
// Res = (CMPB & Mask) | (~CMPB & Alt)
|
|
// Which, as suggested here:
|
|
// https://graphics.stanford.edu/~seander/bithacks.html#MaskedMerge
|
|
// can be written as:
|
|
// Res = Alt ^ ((Alt ^ Mask) & CMPB)
|
|
// useful because the (Alt ^ Mask) can be pre-computed.
|
|
Res = CurDAG->getNode(ISD::AND, dl, VT, Res,
|
|
CurDAG->getConstant(Mask ^ Alt, VT));
|
|
Res = CurDAG->getNode(ISD::XOR, dl, VT, Res, CurDAG->getConstant(Alt, VT));
|
|
}
|
|
|
|
return Res;
|
|
}
|
|
|
|
// When CR bit registers are enabled, an extension of an i1 variable to a i32
|
|
// or i64 value is lowered in terms of a SELECT_I[48] operation, and thus
|
|
// involves constant materialization of a 0 or a 1 or both. If the result of
|
|
// the extension is then operated upon by some operator that can be constant
|
|
// folded with a constant 0 or 1, and that constant can be materialized using
|
|
// only one instruction (like a zero or one), then we should fold in those
|
|
// operations with the select.
|
|
void PPCDAGToDAGISel::foldBoolExts(SDValue &Res, SDNode *&N) {
|
|
if (!PPCSubTarget->useCRBits())
|
|
return;
|
|
|
|
if (N->getOpcode() != ISD::ZERO_EXTEND &&
|
|
N->getOpcode() != ISD::SIGN_EXTEND &&
|
|
N->getOpcode() != ISD::ANY_EXTEND)
|
|
return;
|
|
|
|
if (N->getOperand(0).getValueType() != MVT::i1)
|
|
return;
|
|
|
|
if (!N->hasOneUse())
|
|
return;
|
|
|
|
SDLoc dl(N);
|
|
EVT VT = N->getValueType(0);
|
|
SDValue Cond = N->getOperand(0);
|
|
SDValue ConstTrue =
|
|
CurDAG->getConstant(N->getOpcode() == ISD::SIGN_EXTEND ? -1 : 1, VT);
|
|
SDValue ConstFalse = CurDAG->getConstant(0, VT);
|
|
|
|
do {
|
|
SDNode *User = *N->use_begin();
|
|
if (User->getNumOperands() != 2)
|
|
break;
|
|
|
|
auto TryFold = [this, N, User](SDValue Val) {
|
|
SDValue UserO0 = User->getOperand(0), UserO1 = User->getOperand(1);
|
|
SDValue O0 = UserO0.getNode() == N ? Val : UserO0;
|
|
SDValue O1 = UserO1.getNode() == N ? Val : UserO1;
|
|
|
|
return CurDAG->FoldConstantArithmetic(User->getOpcode(),
|
|
User->getValueType(0),
|
|
O0.getNode(), O1.getNode());
|
|
};
|
|
|
|
SDValue TrueRes = TryFold(ConstTrue);
|
|
if (!TrueRes)
|
|
break;
|
|
SDValue FalseRes = TryFold(ConstFalse);
|
|
if (!FalseRes)
|
|
break;
|
|
|
|
// For us to materialize these using one instruction, we must be able to
|
|
// represent them as signed 16-bit integers.
|
|
uint64_t True = cast<ConstantSDNode>(TrueRes)->getZExtValue(),
|
|
False = cast<ConstantSDNode>(FalseRes)->getZExtValue();
|
|
if (!isInt<16>(True) || !isInt<16>(False))
|
|
break;
|
|
|
|
// We can replace User with a new SELECT node, and try again to see if we
|
|
// can fold the select with its user.
|
|
Res = CurDAG->getSelect(dl, User->getValueType(0), Cond, TrueRes, FalseRes);
|
|
N = User;
|
|
ConstTrue = TrueRes;
|
|
ConstFalse = FalseRes;
|
|
} while (N->hasOneUse());
|
|
}
|
|
|
|
void PPCDAGToDAGISel::PreprocessISelDAG() {
|
|
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
|
|
++Position;
|
|
|
|
bool MadeChange = false;
|
|
while (Position != CurDAG->allnodes_begin()) {
|
|
SDNode *N = --Position;
|
|
if (N->use_empty())
|
|
continue;
|
|
|
|
SDValue Res;
|
|
switch (N->getOpcode()) {
|
|
default: break;
|
|
case ISD::OR:
|
|
Res = combineToCMPB(N);
|
|
break;
|
|
}
|
|
|
|
if (!Res)
|
|
foldBoolExts(Res, N);
|
|
|
|
if (Res) {
|
|
DEBUG(dbgs() << "PPC DAG preprocessing replacing:\nOld: ");
|
|
DEBUG(N->dump(CurDAG));
|
|
DEBUG(dbgs() << "\nNew: ");
|
|
DEBUG(Res.getNode()->dump(CurDAG));
|
|
DEBUG(dbgs() << "\n");
|
|
|
|
CurDAG->ReplaceAllUsesOfValueWith(SDValue(N, 0), Res);
|
|
MadeChange = true;
|
|
}
|
|
}
|
|
|
|
if (MadeChange)
|
|
CurDAG->RemoveDeadNodes();
|
|
}
|
|
|
|
/// PostprocessISelDAG - Perform some late peephole optimizations
|
|
/// on the DAG representation.
|
|
void PPCDAGToDAGISel::PostprocessISelDAG() {
|
|
|
|
// Skip peepholes at -O0.
|
|
if (TM.getOptLevel() == CodeGenOpt::None)
|
|
return;
|
|
|
|
PeepholePPC64();
|
|
PeepholeCROps();
|
|
PeepholePPC64ZExt();
|
|
}
|
|
|
|
// Check if all users of this node will become isel where the second operand
|
|
// is the constant zero. If this is so, and if we can negate the condition,
|
|
// then we can flip the true and false operands. This will allow the zero to
|
|
// be folded with the isel so that we don't need to materialize a register
|
|
// containing zero.
|
|
bool PPCDAGToDAGISel::AllUsersSelectZero(SDNode *N) {
|
|
// If we're not using isel, then this does not matter.
|
|
if (!PPCSubTarget->hasISEL())
|
|
return false;
|
|
|
|
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
|
|
UI != UE; ++UI) {
|
|
SDNode *User = *UI;
|
|
if (!User->isMachineOpcode())
|
|
return false;
|
|
if (User->getMachineOpcode() != PPC::SELECT_I4 &&
|
|
User->getMachineOpcode() != PPC::SELECT_I8)
|
|
return false;
|
|
|
|
SDNode *Op2 = User->getOperand(2).getNode();
|
|
if (!Op2->isMachineOpcode())
|
|
return false;
|
|
|
|
if (Op2->getMachineOpcode() != PPC::LI &&
|
|
Op2->getMachineOpcode() != PPC::LI8)
|
|
return false;
|
|
|
|
ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op2->getOperand(0));
|
|
if (!C)
|
|
return false;
|
|
|
|
if (!C->isNullValue())
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
void PPCDAGToDAGISel::SwapAllSelectUsers(SDNode *N) {
|
|
SmallVector<SDNode *, 4> ToReplace;
|
|
for (SDNode::use_iterator UI = N->use_begin(), UE = N->use_end();
|
|
UI != UE; ++UI) {
|
|
SDNode *User = *UI;
|
|
assert((User->getMachineOpcode() == PPC::SELECT_I4 ||
|
|
User->getMachineOpcode() == PPC::SELECT_I8) &&
|
|
"Must have all select users");
|
|
ToReplace.push_back(User);
|
|
}
|
|
|
|
for (SmallVector<SDNode *, 4>::iterator UI = ToReplace.begin(),
|
|
UE = ToReplace.end(); UI != UE; ++UI) {
|
|
SDNode *User = *UI;
|
|
SDNode *ResNode =
|
|
CurDAG->getMachineNode(User->getMachineOpcode(), SDLoc(User),
|
|
User->getValueType(0), User->getOperand(0),
|
|
User->getOperand(2),
|
|
User->getOperand(1));
|
|
|
|
DEBUG(dbgs() << "CR Peephole replacing:\nOld: ");
|
|
DEBUG(User->dump(CurDAG));
|
|
DEBUG(dbgs() << "\nNew: ");
|
|
DEBUG(ResNode->dump(CurDAG));
|
|
DEBUG(dbgs() << "\n");
|
|
|
|
ReplaceUses(User, ResNode);
|
|
}
|
|
}
|
|
|
|
void PPCDAGToDAGISel::PeepholeCROps() {
|
|
bool IsModified;
|
|
do {
|
|
IsModified = false;
|
|
for (SelectionDAG::allnodes_iterator I = CurDAG->allnodes_begin(),
|
|
E = CurDAG->allnodes_end(); I != E; ++I) {
|
|
MachineSDNode *MachineNode = dyn_cast<MachineSDNode>(I);
|
|
if (!MachineNode || MachineNode->use_empty())
|
|
continue;
|
|
SDNode *ResNode = MachineNode;
|
|
|
|
bool Op1Set = false, Op1Unset = false,
|
|
Op1Not = false,
|
|
Op2Set = false, Op2Unset = false,
|
|
Op2Not = false;
|
|
|
|
unsigned Opcode = MachineNode->getMachineOpcode();
|
|
switch (Opcode) {
|
|
default: break;
|
|
case PPC::CRAND:
|
|
case PPC::CRNAND:
|
|
case PPC::CROR:
|
|
case PPC::CRXOR:
|
|
case PPC::CRNOR:
|
|
case PPC::CREQV:
|
|
case PPC::CRANDC:
|
|
case PPC::CRORC: {
|
|
SDValue Op = MachineNode->getOperand(1);
|
|
if (Op.isMachineOpcode()) {
|
|
if (Op.getMachineOpcode() == PPC::CRSET)
|
|
Op2Set = true;
|
|
else if (Op.getMachineOpcode() == PPC::CRUNSET)
|
|
Op2Unset = true;
|
|
else if (Op.getMachineOpcode() == PPC::CRNOR &&
|
|
Op.getOperand(0) == Op.getOperand(1))
|
|
Op2Not = true;
|
|
}
|
|
} // fallthrough
|
|
case PPC::BC:
|
|
case PPC::BCn:
|
|
case PPC::SELECT_I4:
|
|
case PPC::SELECT_I8:
|
|
case PPC::SELECT_F4:
|
|
case PPC::SELECT_F8:
|
|
case PPC::SELECT_VRRC:
|
|
case PPC::SELECT_VSFRC:
|
|
case PPC::SELECT_VSRC: {
|
|
SDValue Op = MachineNode->getOperand(0);
|
|
if (Op.isMachineOpcode()) {
|
|
if (Op.getMachineOpcode() == PPC::CRSET)
|
|
Op1Set = true;
|
|
else if (Op.getMachineOpcode() == PPC::CRUNSET)
|
|
Op1Unset = true;
|
|
else if (Op.getMachineOpcode() == PPC::CRNOR &&
|
|
Op.getOperand(0) == Op.getOperand(1))
|
|
Op1Not = true;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
|
|
bool SelectSwap = false;
|
|
switch (Opcode) {
|
|
default: break;
|
|
case PPC::CRAND:
|
|
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
|
|
// x & x = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Set)
|
|
// 1 & y = y
|
|
ResNode = MachineNode->getOperand(1).getNode();
|
|
else if (Op2Set)
|
|
// x & 1 = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Unset || Op2Unset)
|
|
// x & 0 = 0 & y = 0
|
|
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Not)
|
|
// ~x & y = andc(y, x)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(0).
|
|
getOperand(0));
|
|
else if (Op2Not)
|
|
// x & ~y = andc(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1).
|
|
getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNAND, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::CRNAND:
|
|
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
|
|
// nand(x, x) -> nor(x, x)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(0));
|
|
else if (Op1Set)
|
|
// nand(1, y) -> nor(y, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Set)
|
|
// nand(x, 1) -> nor(x, x)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(0));
|
|
else if (Op1Unset || Op2Unset)
|
|
// nand(x, 0) = nand(0, y) = 1
|
|
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Not)
|
|
// nand(~x, y) = ~(~x & y) = x | ~y = orc(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Not)
|
|
// nand(x, ~y) = ~x | y = orc(y, x)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1).
|
|
getOperand(0),
|
|
MachineNode->getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CRAND, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::CROR:
|
|
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
|
|
// x | x = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Set || Op2Set)
|
|
// x | 1 = 1 | y = 1
|
|
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Unset)
|
|
// 0 | y = y
|
|
ResNode = MachineNode->getOperand(1).getNode();
|
|
else if (Op2Unset)
|
|
// x | 0 = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Not)
|
|
// ~x | y = orc(y, x)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(0).
|
|
getOperand(0));
|
|
else if (Op2Not)
|
|
// x | ~y = orc(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1).
|
|
getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::CRXOR:
|
|
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
|
|
// xor(x, x) = 0
|
|
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Set)
|
|
// xor(1, y) -> nor(y, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Set)
|
|
// xor(x, 1) -> nor(x, x)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(0));
|
|
else if (Op1Unset)
|
|
// xor(0, y) = y
|
|
ResNode = MachineNode->getOperand(1).getNode();
|
|
else if (Op2Unset)
|
|
// xor(x, 0) = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Not)
|
|
// xor(~x, y) = eqv(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Not)
|
|
// xor(x, ~y) = eqv(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1).
|
|
getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CREQV, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::CRNOR:
|
|
if (Op1Set || Op2Set)
|
|
// nor(1, y) -> 0
|
|
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Unset)
|
|
// nor(0, y) = ~y -> nor(y, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Unset)
|
|
// nor(x, 0) = ~x
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(0));
|
|
else if (Op1Not)
|
|
// nor(~x, y) = andc(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Not)
|
|
// nor(x, ~y) = andc(y, x)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1).
|
|
getOperand(0),
|
|
MachineNode->getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CROR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::CREQV:
|
|
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
|
|
// eqv(x, x) = 1
|
|
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Set)
|
|
// eqv(1, y) = y
|
|
ResNode = MachineNode->getOperand(1).getNode();
|
|
else if (Op2Set)
|
|
// eqv(x, 1) = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Unset)
|
|
// eqv(0, y) = ~y -> nor(y, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Unset)
|
|
// eqv(x, 0) = ~x
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(0));
|
|
else if (Op1Not)
|
|
// eqv(~x, y) = xor(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Not)
|
|
// eqv(x, ~y) = xor(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1).
|
|
getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CRXOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::CRANDC:
|
|
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
|
|
// andc(x, x) = 0
|
|
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Set)
|
|
// andc(1, y) = ~y
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(1));
|
|
else if (Op1Unset || Op2Set)
|
|
// andc(0, y) = andc(x, 1) = 0
|
|
ResNode = CurDAG->getMachineNode(PPC::CRUNSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op2Unset)
|
|
// andc(x, 0) = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Not)
|
|
// andc(~x, y) = ~(x | y) = nor(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Not)
|
|
// andc(x, ~y) = x & y
|
|
ResNode = CurDAG->getMachineNode(PPC::CRAND, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1).
|
|
getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CRORC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(0)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::CRORC:
|
|
if (MachineNode->getOperand(0) == MachineNode->getOperand(1))
|
|
// orc(x, x) = 1
|
|
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op1Set || Op2Unset)
|
|
// orc(1, y) = orc(x, 0) = 1
|
|
ResNode = CurDAG->getMachineNode(PPC::CRSET, SDLoc(MachineNode),
|
|
MVT::i1);
|
|
else if (Op2Set)
|
|
// orc(x, 1) = x
|
|
ResNode = MachineNode->getOperand(0).getNode();
|
|
else if (Op1Unset)
|
|
// orc(0, y) = ~y
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNOR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(1));
|
|
else if (Op1Not)
|
|
// orc(~x, y) = ~(x & y) = nand(x, y)
|
|
ResNode = CurDAG->getMachineNode(PPC::CRNAND, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(1));
|
|
else if (Op2Not)
|
|
// orc(x, ~y) = x | y
|
|
ResNode = CurDAG->getMachineNode(PPC::CROR, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(0),
|
|
MachineNode->getOperand(1).
|
|
getOperand(0));
|
|
else if (AllUsersSelectZero(MachineNode))
|
|
ResNode = CurDAG->getMachineNode(PPC::CRANDC, SDLoc(MachineNode),
|
|
MVT::i1, MachineNode->getOperand(1),
|
|
MachineNode->getOperand(0)),
|
|
SelectSwap = true;
|
|
break;
|
|
case PPC::SELECT_I4:
|
|
case PPC::SELECT_I8:
|
|
case PPC::SELECT_F4:
|
|
case PPC::SELECT_F8:
|
|
case PPC::SELECT_VRRC:
|
|
case PPC::SELECT_VSFRC:
|
|
case PPC::SELECT_VSRC:
|
|
if (Op1Set)
|
|
ResNode = MachineNode->getOperand(1).getNode();
|
|
else if (Op1Unset)
|
|
ResNode = MachineNode->getOperand(2).getNode();
|
|
else if (Op1Not)
|
|
ResNode = CurDAG->getMachineNode(MachineNode->getMachineOpcode(),
|
|
SDLoc(MachineNode),
|
|
MachineNode->getValueType(0),
|
|
MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(2),
|
|
MachineNode->getOperand(1));
|
|
break;
|
|
case PPC::BC:
|
|
case PPC::BCn:
|
|
if (Op1Not)
|
|
ResNode = CurDAG->getMachineNode(Opcode == PPC::BC ? PPC::BCn :
|
|
PPC::BC,
|
|
SDLoc(MachineNode),
|
|
MVT::Other,
|
|
MachineNode->getOperand(0).
|
|
getOperand(0),
|
|
MachineNode->getOperand(1),
|
|
MachineNode->getOperand(2));
|
|
// FIXME: Handle Op1Set, Op1Unset here too.
|
|
break;
|
|
}
|
|
|
|
// If we're inverting this node because it is used only by selects that
|
|
// we'd like to swap, then swap the selects before the node replacement.
|
|
if (SelectSwap)
|
|
SwapAllSelectUsers(MachineNode);
|
|
|
|
if (ResNode != MachineNode) {
|
|
DEBUG(dbgs() << "CR Peephole replacing:\nOld: ");
|
|
DEBUG(MachineNode->dump(CurDAG));
|
|
DEBUG(dbgs() << "\nNew: ");
|
|
DEBUG(ResNode->dump(CurDAG));
|
|
DEBUG(dbgs() << "\n");
|
|
|
|
ReplaceUses(MachineNode, ResNode);
|
|
IsModified = true;
|
|
}
|
|
}
|
|
if (IsModified)
|
|
CurDAG->RemoveDeadNodes();
|
|
} while (IsModified);
|
|
}
|
|
|
|
// Gather the set of 32-bit operations that are known to have their
|
|
// higher-order 32 bits zero, where ToPromote contains all such operations.
|
|
static bool PeepholePPC64ZExtGather(SDValue Op32,
|
|
SmallPtrSetImpl<SDNode *> &ToPromote) {
|
|
if (!Op32.isMachineOpcode())
|
|
return false;
|
|
|
|
// First, check for the "frontier" instructions (those that will clear the
|
|
// higher-order 32 bits.
|
|
|
|
// For RLWINM and RLWNM, we need to make sure that the mask does not wrap
|
|
// around. If it does not, then these instructions will clear the
|
|
// higher-order bits.
|
|
if ((Op32.getMachineOpcode() == PPC::RLWINM ||
|
|
Op32.getMachineOpcode() == PPC::RLWNM) &&
|
|
Op32.getConstantOperandVal(2) <= Op32.getConstantOperandVal(3)) {
|
|
ToPromote.insert(Op32.getNode());
|
|
return true;
|
|
}
|
|
|
|
// SLW and SRW always clear the higher-order bits.
|
|
if (Op32.getMachineOpcode() == PPC::SLW ||
|
|
Op32.getMachineOpcode() == PPC::SRW) {
|
|
ToPromote.insert(Op32.getNode());
|
|
return true;
|
|
}
|
|
|
|
// For LI and LIS, we need the immediate to be positive (so that it is not
|
|
// sign extended).
|
|
if (Op32.getMachineOpcode() == PPC::LI ||
|
|
Op32.getMachineOpcode() == PPC::LIS) {
|
|
if (!isUInt<15>(Op32.getConstantOperandVal(0)))
|
|
return false;
|
|
|
|
ToPromote.insert(Op32.getNode());
|
|
return true;
|
|
}
|
|
|
|
// LHBRX and LWBRX always clear the higher-order bits.
|
|
if (Op32.getMachineOpcode() == PPC::LHBRX ||
|
|
Op32.getMachineOpcode() == PPC::LWBRX) {
|
|
ToPromote.insert(Op32.getNode());
|
|
return true;
|
|
}
|
|
|
|
// CNTLZW always produces a 64-bit value in [0,32], and so is zero extended.
|
|
if (Op32.getMachineOpcode() == PPC::CNTLZW) {
|
|
ToPromote.insert(Op32.getNode());
|
|
return true;
|
|
}
|
|
|
|
// Next, check for those instructions we can look through.
|
|
|
|
// Assuming the mask does not wrap around, then the higher-order bits are
|
|
// taken directly from the first operand.
|
|
if (Op32.getMachineOpcode() == PPC::RLWIMI &&
|
|
Op32.getConstantOperandVal(3) <= Op32.getConstantOperandVal(4)) {
|
|
SmallPtrSet<SDNode *, 16> ToPromote1;
|
|
if (!PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1))
|
|
return false;
|
|
|
|
ToPromote.insert(Op32.getNode());
|
|
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
|
|
return true;
|
|
}
|
|
|
|
// For OR, the higher-order bits are zero if that is true for both operands.
|
|
// For SELECT_I4, the same is true (but the relevant operand numbers are
|
|
// shifted by 1).
|
|
if (Op32.getMachineOpcode() == PPC::OR ||
|
|
Op32.getMachineOpcode() == PPC::SELECT_I4) {
|
|
unsigned B = Op32.getMachineOpcode() == PPC::SELECT_I4 ? 1 : 0;
|
|
SmallPtrSet<SDNode *, 16> ToPromote1;
|
|
if (!PeepholePPC64ZExtGather(Op32.getOperand(B+0), ToPromote1))
|
|
return false;
|
|
if (!PeepholePPC64ZExtGather(Op32.getOperand(B+1), ToPromote1))
|
|
return false;
|
|
|
|
ToPromote.insert(Op32.getNode());
|
|
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
|
|
return true;
|
|
}
|
|
|
|
// For ORI and ORIS, we need the higher-order bits of the first operand to be
|
|
// zero, and also for the constant to be positive (so that it is not sign
|
|
// extended).
|
|
if (Op32.getMachineOpcode() == PPC::ORI ||
|
|
Op32.getMachineOpcode() == PPC::ORIS) {
|
|
SmallPtrSet<SDNode *, 16> ToPromote1;
|
|
if (!PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1))
|
|
return false;
|
|
if (!isUInt<15>(Op32.getConstantOperandVal(1)))
|
|
return false;
|
|
|
|
ToPromote.insert(Op32.getNode());
|
|
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
|
|
return true;
|
|
}
|
|
|
|
// The higher-order bits of AND are zero if that is true for at least one of
|
|
// the operands.
|
|
if (Op32.getMachineOpcode() == PPC::AND) {
|
|
SmallPtrSet<SDNode *, 16> ToPromote1, ToPromote2;
|
|
bool Op0OK =
|
|
PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1);
|
|
bool Op1OK =
|
|
PeepholePPC64ZExtGather(Op32.getOperand(1), ToPromote2);
|
|
if (!Op0OK && !Op1OK)
|
|
return false;
|
|
|
|
ToPromote.insert(Op32.getNode());
|
|
|
|
if (Op0OK)
|
|
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
|
|
|
|
if (Op1OK)
|
|
ToPromote.insert(ToPromote2.begin(), ToPromote2.end());
|
|
|
|
return true;
|
|
}
|
|
|
|
// For ANDI and ANDIS, the higher-order bits are zero if either that is true
|
|
// of the first operand, or if the second operand is positive (so that it is
|
|
// not sign extended).
|
|
if (Op32.getMachineOpcode() == PPC::ANDIo ||
|
|
Op32.getMachineOpcode() == PPC::ANDISo) {
|
|
SmallPtrSet<SDNode *, 16> ToPromote1;
|
|
bool Op0OK =
|
|
PeepholePPC64ZExtGather(Op32.getOperand(0), ToPromote1);
|
|
bool Op1OK = isUInt<15>(Op32.getConstantOperandVal(1));
|
|
if (!Op0OK && !Op1OK)
|
|
return false;
|
|
|
|
ToPromote.insert(Op32.getNode());
|
|
|
|
if (Op0OK)
|
|
ToPromote.insert(ToPromote1.begin(), ToPromote1.end());
|
|
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void PPCDAGToDAGISel::PeepholePPC64ZExt() {
|
|
if (!PPCSubTarget->isPPC64())
|
|
return;
|
|
|
|
// When we zero-extend from i32 to i64, we use a pattern like this:
|
|
// def : Pat<(i64 (zext i32:$in)),
|
|
// (RLDICL (INSERT_SUBREG (i64 (IMPLICIT_DEF)), $in, sub_32),
|
|
// 0, 32)>;
|
|
// There are several 32-bit shift/rotate instructions, however, that will
|
|
// clear the higher-order bits of their output, rendering the RLDICL
|
|
// unnecessary. When that happens, we remove it here, and redefine the
|
|
// relevant 32-bit operation to be a 64-bit operation.
|
|
|
|
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
|
|
++Position;
|
|
|
|
bool MadeChange = false;
|
|
while (Position != CurDAG->allnodes_begin()) {
|
|
SDNode *N = --Position;
|
|
// Skip dead nodes and any non-machine opcodes.
|
|
if (N->use_empty() || !N->isMachineOpcode())
|
|
continue;
|
|
|
|
if (N->getMachineOpcode() != PPC::RLDICL)
|
|
continue;
|
|
|
|
if (N->getConstantOperandVal(1) != 0 ||
|
|
N->getConstantOperandVal(2) != 32)
|
|
continue;
|
|
|
|
SDValue ISR = N->getOperand(0);
|
|
if (!ISR.isMachineOpcode() ||
|
|
ISR.getMachineOpcode() != TargetOpcode::INSERT_SUBREG)
|
|
continue;
|
|
|
|
if (!ISR.hasOneUse())
|
|
continue;
|
|
|
|
if (ISR.getConstantOperandVal(2) != PPC::sub_32)
|
|
continue;
|
|
|
|
SDValue IDef = ISR.getOperand(0);
|
|
if (!IDef.isMachineOpcode() ||
|
|
IDef.getMachineOpcode() != TargetOpcode::IMPLICIT_DEF)
|
|
continue;
|
|
|
|
// We now know that we're looking at a canonical i32 -> i64 zext. See if we
|
|
// can get rid of it.
|
|
|
|
SDValue Op32 = ISR->getOperand(1);
|
|
if (!Op32.isMachineOpcode())
|
|
continue;
|
|
|
|
// There are some 32-bit instructions that always clear the high-order 32
|
|
// bits, there are also some instructions (like AND) that we can look
|
|
// through.
|
|
SmallPtrSet<SDNode *, 16> ToPromote;
|
|
if (!PeepholePPC64ZExtGather(Op32, ToPromote))
|
|
continue;
|
|
|
|
// If the ToPromote set contains nodes that have uses outside of the set
|
|
// (except for the original INSERT_SUBREG), then abort the transformation.
|
|
bool OutsideUse = false;
|
|
for (SDNode *PN : ToPromote) {
|
|
for (SDNode *UN : PN->uses()) {
|
|
if (!ToPromote.count(UN) && UN != ISR.getNode()) {
|
|
OutsideUse = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (OutsideUse)
|
|
break;
|
|
}
|
|
if (OutsideUse)
|
|
continue;
|
|
|
|
MadeChange = true;
|
|
|
|
// We now know that this zero extension can be removed by promoting to
|
|
// nodes in ToPromote to 64-bit operations, where for operations in the
|
|
// frontier of the set, we need to insert INSERT_SUBREGs for their
|
|
// operands.
|
|
for (SDNode *PN : ToPromote) {
|
|
unsigned NewOpcode;
|
|
switch (PN->getMachineOpcode()) {
|
|
default:
|
|
llvm_unreachable("Don't know the 64-bit variant of this instruction");
|
|
case PPC::RLWINM: NewOpcode = PPC::RLWINM8; break;
|
|
case PPC::RLWNM: NewOpcode = PPC::RLWNM8; break;
|
|
case PPC::SLW: NewOpcode = PPC::SLW8; break;
|
|
case PPC::SRW: NewOpcode = PPC::SRW8; break;
|
|
case PPC::LI: NewOpcode = PPC::LI8; break;
|
|
case PPC::LIS: NewOpcode = PPC::LIS8; break;
|
|
case PPC::LHBRX: NewOpcode = PPC::LHBRX8; break;
|
|
case PPC::LWBRX: NewOpcode = PPC::LWBRX8; break;
|
|
case PPC::CNTLZW: NewOpcode = PPC::CNTLZW8; break;
|
|
case PPC::RLWIMI: NewOpcode = PPC::RLWIMI8; break;
|
|
case PPC::OR: NewOpcode = PPC::OR8; break;
|
|
case PPC::SELECT_I4: NewOpcode = PPC::SELECT_I8; break;
|
|
case PPC::ORI: NewOpcode = PPC::ORI8; break;
|
|
case PPC::ORIS: NewOpcode = PPC::ORIS8; break;
|
|
case PPC::AND: NewOpcode = PPC::AND8; break;
|
|
case PPC::ANDIo: NewOpcode = PPC::ANDIo8; break;
|
|
case PPC::ANDISo: NewOpcode = PPC::ANDISo8; break;
|
|
}
|
|
|
|
// Note: During the replacement process, the nodes will be in an
|
|
// inconsistent state (some instructions will have operands with values
|
|
// of the wrong type). Once done, however, everything should be right
|
|
// again.
|
|
|
|
SmallVector<SDValue, 4> Ops;
|
|
for (const SDValue &V : PN->ops()) {
|
|
if (!ToPromote.count(V.getNode()) && V.getValueType() == MVT::i32 &&
|
|
!isa<ConstantSDNode>(V)) {
|
|
SDValue ReplOpOps[] = { ISR.getOperand(0), V, ISR.getOperand(2) };
|
|
SDNode *ReplOp =
|
|
CurDAG->getMachineNode(TargetOpcode::INSERT_SUBREG, SDLoc(V),
|
|
ISR.getNode()->getVTList(), ReplOpOps);
|
|
Ops.push_back(SDValue(ReplOp, 0));
|
|
} else {
|
|
Ops.push_back(V);
|
|
}
|
|
}
|
|
|
|
// Because all to-be-promoted nodes only have users that are other
|
|
// promoted nodes (or the original INSERT_SUBREG), we can safely replace
|
|
// the i32 result value type with i64.
|
|
|
|
SmallVector<EVT, 2> NewVTs;
|
|
SDVTList VTs = PN->getVTList();
|
|
for (unsigned i = 0, ie = VTs.NumVTs; i != ie; ++i)
|
|
if (VTs.VTs[i] == MVT::i32)
|
|
NewVTs.push_back(MVT::i64);
|
|
else
|
|
NewVTs.push_back(VTs.VTs[i]);
|
|
|
|
DEBUG(dbgs() << "PPC64 ZExt Peephole morphing:\nOld: ");
|
|
DEBUG(PN->dump(CurDAG));
|
|
|
|
CurDAG->SelectNodeTo(PN, NewOpcode, CurDAG->getVTList(NewVTs), Ops);
|
|
|
|
DEBUG(dbgs() << "\nNew: ");
|
|
DEBUG(PN->dump(CurDAG));
|
|
DEBUG(dbgs() << "\n");
|
|
}
|
|
|
|
// Now we replace the original zero extend and its associated INSERT_SUBREG
|
|
// with the value feeding the INSERT_SUBREG (which has now been promoted to
|
|
// return an i64).
|
|
|
|
DEBUG(dbgs() << "PPC64 ZExt Peephole replacing:\nOld: ");
|
|
DEBUG(N->dump(CurDAG));
|
|
DEBUG(dbgs() << "\nNew: ");
|
|
DEBUG(Op32.getNode()->dump(CurDAG));
|
|
DEBUG(dbgs() << "\n");
|
|
|
|
ReplaceUses(N, Op32.getNode());
|
|
}
|
|
|
|
if (MadeChange)
|
|
CurDAG->RemoveDeadNodes();
|
|
}
|
|
|
|
void PPCDAGToDAGISel::PeepholePPC64() {
|
|
// These optimizations are currently supported only for 64-bit SVR4.
|
|
if (PPCSubTarget->isDarwin() || !PPCSubTarget->isPPC64())
|
|
return;
|
|
|
|
SelectionDAG::allnodes_iterator Position(CurDAG->getRoot().getNode());
|
|
++Position;
|
|
|
|
while (Position != CurDAG->allnodes_begin()) {
|
|
SDNode *N = --Position;
|
|
// Skip dead nodes and any non-machine opcodes.
|
|
if (N->use_empty() || !N->isMachineOpcode())
|
|
continue;
|
|
|
|
unsigned FirstOp;
|
|
unsigned StorageOpcode = N->getMachineOpcode();
|
|
|
|
switch (StorageOpcode) {
|
|
default: continue;
|
|
|
|
case PPC::LBZ:
|
|
case PPC::LBZ8:
|
|
case PPC::LD:
|
|
case PPC::LFD:
|
|
case PPC::LFS:
|
|
case PPC::LHA:
|
|
case PPC::LHA8:
|
|
case PPC::LHZ:
|
|
case PPC::LHZ8:
|
|
case PPC::LWA:
|
|
case PPC::LWZ:
|
|
case PPC::LWZ8:
|
|
FirstOp = 0;
|
|
break;
|
|
|
|
case PPC::STB:
|
|
case PPC::STB8:
|
|
case PPC::STD:
|
|
case PPC::STFD:
|
|
case PPC::STFS:
|
|
case PPC::STH:
|
|
case PPC::STH8:
|
|
case PPC::STW:
|
|
case PPC::STW8:
|
|
FirstOp = 1;
|
|
break;
|
|
}
|
|
|
|
// If this is a load or store with a zero offset, we may be able to
|
|
// fold an add-immediate into the memory operation.
|
|
if (!isa<ConstantSDNode>(N->getOperand(FirstOp)) ||
|
|
N->getConstantOperandVal(FirstOp) != 0)
|
|
continue;
|
|
|
|
SDValue Base = N->getOperand(FirstOp + 1);
|
|
if (!Base.isMachineOpcode())
|
|
continue;
|
|
|
|
unsigned Flags = 0;
|
|
bool ReplaceFlags = true;
|
|
|
|
// When the feeding operation is an add-immediate of some sort,
|
|
// determine whether we need to add relocation information to the
|
|
// target flags on the immediate operand when we fold it into the
|
|
// load instruction.
|
|
//
|
|
// For something like ADDItocL, the relocation information is
|
|
// inferred from the opcode; when we process it in the AsmPrinter,
|
|
// we add the necessary relocation there. A load, though, can receive
|
|
// relocation from various flavors of ADDIxxx, so we need to carry
|
|
// the relocation information in the target flags.
|
|
switch (Base.getMachineOpcode()) {
|
|
default: continue;
|
|
|
|
case PPC::ADDI8:
|
|
case PPC::ADDI:
|
|
// In some cases (such as TLS) the relocation information
|
|
// is already in place on the operand, so copying the operand
|
|
// is sufficient.
|
|
ReplaceFlags = false;
|
|
// For these cases, the immediate may not be divisible by 4, in
|
|
// which case the fold is illegal for DS-form instructions. (The
|
|
// other cases provide aligned addresses and are always safe.)
|
|
if ((StorageOpcode == PPC::LWA ||
|
|
StorageOpcode == PPC::LD ||
|
|
StorageOpcode == PPC::STD) &&
|
|
(!isa<ConstantSDNode>(Base.getOperand(1)) ||
|
|
Base.getConstantOperandVal(1) % 4 != 0))
|
|
continue;
|
|
break;
|
|
case PPC::ADDIdtprelL:
|
|
Flags = PPCII::MO_DTPREL_LO;
|
|
break;
|
|
case PPC::ADDItlsldL:
|
|
Flags = PPCII::MO_TLSLD_LO;
|
|
break;
|
|
case PPC::ADDItocL:
|
|
Flags = PPCII::MO_TOC_LO;
|
|
break;
|
|
}
|
|
|
|
// We found an opportunity. Reverse the operands from the add
|
|
// immediate and substitute them into the load or store. If
|
|
// needed, update the target flags for the immediate operand to
|
|
// reflect the necessary relocation information.
|
|
DEBUG(dbgs() << "Folding add-immediate into mem-op:\nBase: ");
|
|
DEBUG(Base->dump(CurDAG));
|
|
DEBUG(dbgs() << "\nN: ");
|
|
DEBUG(N->dump(CurDAG));
|
|
DEBUG(dbgs() << "\n");
|
|
|
|
SDValue ImmOpnd = Base.getOperand(1);
|
|
|
|
// If the relocation information isn't already present on the
|
|
// immediate operand, add it now.
|
|
if (ReplaceFlags) {
|
|
if (GlobalAddressSDNode *GA = dyn_cast<GlobalAddressSDNode>(ImmOpnd)) {
|
|
SDLoc dl(GA);
|
|
const GlobalValue *GV = GA->getGlobal();
|
|
// We can't perform this optimization for data whose alignment
|
|
// is insufficient for the instruction encoding.
|
|
if (GV->getAlignment() < 4 &&
|
|
(StorageOpcode == PPC::LD || StorageOpcode == PPC::STD ||
|
|
StorageOpcode == PPC::LWA)) {
|
|
DEBUG(dbgs() << "Rejected this candidate for alignment.\n\n");
|
|
continue;
|
|
}
|
|
ImmOpnd = CurDAG->getTargetGlobalAddress(GV, dl, MVT::i64, 0, Flags);
|
|
} else if (ConstantPoolSDNode *CP =
|
|
dyn_cast<ConstantPoolSDNode>(ImmOpnd)) {
|
|
const Constant *C = CP->getConstVal();
|
|
ImmOpnd = CurDAG->getTargetConstantPool(C, MVT::i64,
|
|
CP->getAlignment(),
|
|
0, Flags);
|
|
}
|
|
}
|
|
|
|
if (FirstOp == 1) // Store
|
|
(void)CurDAG->UpdateNodeOperands(N, N->getOperand(0), ImmOpnd,
|
|
Base.getOperand(0), N->getOperand(3));
|
|
else // Load
|
|
(void)CurDAG->UpdateNodeOperands(N, ImmOpnd, Base.getOperand(0),
|
|
N->getOperand(2));
|
|
|
|
// The add-immediate may now be dead, in which case remove it.
|
|
if (Base.getNode()->use_empty())
|
|
CurDAG->RemoveDeadNode(Base.getNode());
|
|
}
|
|
}
|
|
|
|
|
|
/// createPPCISelDag - This pass converts a legalized DAG into a
|
|
/// PowerPC-specific DAG, ready for instruction scheduling.
|
|
///
|
|
FunctionPass *llvm::createPPCISelDag(PPCTargetMachine &TM) {
|
|
return new PPCDAGToDAGISel(TM);
|
|
}
|
|
|
|
static void initializePassOnce(PassRegistry &Registry) {
|
|
const char *Name = "PowerPC DAG->DAG Pattern Instruction Selection";
|
|
PassInfo *PI = new PassInfo(Name, "ppc-codegen", &SelectionDAGISel::ID,
|
|
nullptr, false, false);
|
|
Registry.registerPass(*PI, true);
|
|
}
|
|
|
|
void llvm::initializePPCDAGToDAGISelPass(PassRegistry &Registry) {
|
|
CALL_ONCE_INITIALIZATION(initializePassOnce);
|
|
}
|
|
|