6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-15 04:30:12 +00:00
Code Issues Projects Releases Wiki Activity
72e7586339
llvm-6502/lib/Target/Mips/MipsISelLowering.cpp
Eric Christopher fcd3c4065d Move the Mips target to storing the ABI in the TargetMachine rather 
than on MipsSubtargetInfo.

This required a bit of massaging in the MC level to handle this since
MC is a) largely a collection of disparate classes with no hierarchy,
and b) there's no overarching equivalent to the TargetMachine, instead
only the subtarget via MCSubtargetInfo (which is the base class of
TargetSubtargetInfo).

We're now storing the ABI in both the TargetMachine level and in the
MC level because the AsmParser and the TargetStreamer both need to
know what ABI we have to parse assembly and emit objects. The target
streamer has a pointer to the one in the asm parser and is updated
when the asm parser is created. This is fragile as the FIXME comment
notes, but shouldn't be a problem in practice since we always
create an asm parser before attempting to emit object code via the
assembler. The TargetMachine now contains the ABI so that the DataLayout
can be constructed dependent upon ABI.

All testcases have been updated to use the -target-abi command line
flag so that we can set the ABI without using a subtarget feature.

Should be no change visible externally here.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227102 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-26 17:33:46 +00:00

3879 lines
149 KiB
C++
Raw Blame History

//===-- MipsISelLowering.cpp - Mips DAG Lowering Implementation -----------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines the interfaces that Mips uses to lower LLVM code into a
// selection DAG.
//
//===----------------------------------------------------------------------===//
#include "MipsISelLowering.h"
#include "InstPrinter/MipsInstPrinter.h"
#include "MCTargetDesc/MipsBaseInfo.h"
#include "MipsCCState.h"
#include "MipsMachineFunction.h"
#include "MipsSubtarget.h"
#include "MipsTargetMachine.h"
#include "MipsTargetObjectFile.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/CodeGen/CallingConvLower.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineJumpTableInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/ValueTypes.h"
#include "llvm/IR/CallingConv.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cctype>
using namespace llvm;
#define DEBUG_TYPE "mips-lower"
STATISTIC(NumTailCalls, "Number of tail calls");
static cl::opt<bool>
LargeGOT("mxgot", cl::Hidden,
cl::desc("MIPS: Enable GOT larger than 64k."), cl::init(false));
static cl::opt<bool>
NoZeroDivCheck("mno-check-zero-division", cl::Hidden,
cl::desc("MIPS: Don't trap on integer division by zero."),
cl::init(false));
cl::opt<bool>
EnableMipsFastISel("mips-fast-isel", cl::Hidden,
cl::desc("Allow mips-fast-isel to be used"),
cl::init(false));
static const MCPhysReg Mips64DPRegs[8] = {
Mips::D12_64, Mips::D13_64, Mips::D14_64, Mips::D15_64,
Mips::D16_64, Mips::D17_64, Mips::D18_64, Mips::D19_64
};
// If I is a shifted mask, set the size (Size) and the first bit of the
// mask (Pos), and return true.
// For example, if I is 0x003ff800, (Pos, Size) = (11, 11).
static bool isShiftedMask(uint64_t I, uint64_t &Pos, uint64_t &Size) {
if (!isShiftedMask_64(I))
return false;
Size = CountPopulation_64(I);
Pos = countTrailingZeros(I);
return true;
}
SDValue MipsTargetLowering::getGlobalReg(SelectionDAG &DAG, EVT Ty) const {
MipsFunctionInfo *FI = DAG.getMachineFunction().getInfo<MipsFunctionInfo>();
return DAG.getRegister(FI->getGlobalBaseReg(), Ty);
}
SDValue MipsTargetLowering::getTargetNode(GlobalAddressSDNode *N, EVT Ty,
SelectionDAG &DAG,
unsigned Flag) const {
return DAG.getTargetGlobalAddress(N->getGlobal(), SDLoc(N), Ty, 0, Flag);
}
SDValue MipsTargetLowering::getTargetNode(ExternalSymbolSDNode *N, EVT Ty,
SelectionDAG &DAG,
unsigned Flag) const {
return DAG.getTargetExternalSymbol(N->getSymbol(), Ty, Flag);
}
SDValue MipsTargetLowering::getTargetNode(BlockAddressSDNode *N, EVT Ty,
SelectionDAG &DAG,
unsigned Flag) const {
return DAG.getTargetBlockAddress(N->getBlockAddress(), Ty, 0, Flag);
}
SDValue MipsTargetLowering::getTargetNode(JumpTableSDNode *N, EVT Ty,
SelectionDAG &DAG,
unsigned Flag) const {
return DAG.getTargetJumpTable(N->getIndex(), Ty, Flag);
}
SDValue MipsTargetLowering::getTargetNode(ConstantPoolSDNode *N, EVT Ty,
SelectionDAG &DAG,
unsigned Flag) const {
return DAG.getTargetConstantPool(N->getConstVal(), Ty, N->getAlignment(),
N->getOffset(), Flag);
}
const char *MipsTargetLowering::getTargetNodeName(unsigned Opcode) const {
switch (Opcode) {
case MipsISD::JmpLink: return "MipsISD::JmpLink";
case MipsISD::TailCall: return "MipsISD::TailCall";
case MipsISD::Hi: return "MipsISD::Hi";
case MipsISD::Lo: return "MipsISD::Lo";
case MipsISD::GPRel: return "MipsISD::GPRel";
case MipsISD::ThreadPointer: return "MipsISD::ThreadPointer";
case MipsISD::Ret: return "MipsISD::Ret";
case MipsISD::EH_RETURN: return "MipsISD::EH_RETURN";
case MipsISD::FPBrcond: return "MipsISD::FPBrcond";
case MipsISD::FPCmp: return "MipsISD::FPCmp";
case MipsISD::CMovFP_T: return "MipsISD::CMovFP_T";
case MipsISD::CMovFP_F: return "MipsISD::CMovFP_F";
case MipsISD::TruncIntFP: return "MipsISD::TruncIntFP";
case MipsISD::MFHI: return "MipsISD::MFHI";
case MipsISD::MFLO: return "MipsISD::MFLO";
case MipsISD::MTLOHI: return "MipsISD::MTLOHI";
case MipsISD::Mult: return "MipsISD::Mult";
case MipsISD::Multu: return "MipsISD::Multu";
case MipsISD::MAdd: return "MipsISD::MAdd";
case MipsISD::MAddu: return "MipsISD::MAddu";
case MipsISD::MSub: return "MipsISD::MSub";
case MipsISD::MSubu: return "MipsISD::MSubu";
case MipsISD::DivRem: return "MipsISD::DivRem";
case MipsISD::DivRemU: return "MipsISD::DivRemU";
case MipsISD::DivRem16: return "MipsISD::DivRem16";
case MipsISD::DivRemU16: return "MipsISD::DivRemU16";
case MipsISD::BuildPairF64: return "MipsISD::BuildPairF64";
case MipsISD::ExtractElementF64: return "MipsISD::ExtractElementF64";
case MipsISD::Wrapper: return "MipsISD::Wrapper";
case MipsISD::Sync: return "MipsISD::Sync";
case MipsISD::Ext: return "MipsISD::Ext";
case MipsISD::Ins: return "MipsISD::Ins";
case MipsISD::LWL: return "MipsISD::LWL";
case MipsISD::LWR: return "MipsISD::LWR";
case MipsISD::SWL: return "MipsISD::SWL";
case MipsISD::SWR: return "MipsISD::SWR";
case MipsISD::LDL: return "MipsISD::LDL";
case MipsISD::LDR: return "MipsISD::LDR";
case MipsISD::SDL: return "MipsISD::SDL";
case MipsISD::SDR: return "MipsISD::SDR";
case MipsISD::EXTP: return "MipsISD::EXTP";
case MipsISD::EXTPDP: return "MipsISD::EXTPDP";
case MipsISD::EXTR_S_H: return "MipsISD::EXTR_S_H";
case MipsISD::EXTR_W: return "MipsISD::EXTR_W";
case MipsISD::EXTR_R_W: return "MipsISD::EXTR_R_W";
case MipsISD::EXTR_RS_W: return "MipsISD::EXTR_RS_W";
case MipsISD::SHILO: return "MipsISD::SHILO";
case MipsISD::MTHLIP: return "MipsISD::MTHLIP";
case MipsISD::MULT: return "MipsISD::MULT";
case MipsISD::MULTU: return "MipsISD::MULTU";
case MipsISD::MADD_DSP: return "MipsISD::MADD_DSP";
case MipsISD::MADDU_DSP: return "MipsISD::MADDU_DSP";
case MipsISD::MSUB_DSP: return "MipsISD::MSUB_DSP";
case MipsISD::MSUBU_DSP: return "MipsISD::MSUBU_DSP";
case MipsISD::SHLL_DSP: return "MipsISD::SHLL_DSP";
case MipsISD::SHRA_DSP: return "MipsISD::SHRA_DSP";
case MipsISD::SHRL_DSP: return "MipsISD::SHRL_DSP";
case MipsISD::SETCC_DSP: return "MipsISD::SETCC_DSP";
case MipsISD::SELECT_CC_DSP: return "MipsISD::SELECT_CC_DSP";
case MipsISD::VALL_ZERO: return "MipsISD::VALL_ZERO";
case MipsISD::VANY_ZERO: return "MipsISD::VANY_ZERO";
case MipsISD::VALL_NONZERO: return "MipsISD::VALL_NONZERO";
case MipsISD::VANY_NONZERO: return "MipsISD::VANY_NONZERO";
case MipsISD::VCEQ: return "MipsISD::VCEQ";
case MipsISD::VCLE_S: return "MipsISD::VCLE_S";
case MipsISD::VCLE_U: return "MipsISD::VCLE_U";
case MipsISD::VCLT_S: return "MipsISD::VCLT_S";
case MipsISD::VCLT_U: return "MipsISD::VCLT_U";
case MipsISD::VSMAX: return "MipsISD::VSMAX";
case MipsISD::VSMIN: return "MipsISD::VSMIN";
case MipsISD::VUMAX: return "MipsISD::VUMAX";
case MipsISD::VUMIN: return "MipsISD::VUMIN";
case MipsISD::VEXTRACT_SEXT_ELT: return "MipsISD::VEXTRACT_SEXT_ELT";
case MipsISD::VEXTRACT_ZEXT_ELT: return "MipsISD::VEXTRACT_ZEXT_ELT";
case MipsISD::VNOR: return "MipsISD::VNOR";
case MipsISD::VSHF: return "MipsISD::VSHF";
case MipsISD::SHF: return "MipsISD::SHF";
case MipsISD::ILVEV: return "MipsISD::ILVEV";
case MipsISD::ILVOD: return "MipsISD::ILVOD";
case MipsISD::ILVL: return "MipsISD::ILVL";
case MipsISD::ILVR: return "MipsISD::ILVR";
case MipsISD::PCKEV: return "MipsISD::PCKEV";
case MipsISD::PCKOD: return "MipsISD::PCKOD";
case MipsISD::INSVE: return "MipsISD::INSVE";
default: return nullptr;
}
}
MipsTargetLowering::MipsTargetLowering(const MipsTargetMachine &TM,
const MipsSubtarget &STI)
: TargetLowering(TM), Subtarget(STI) {
// Mips does not have i1 type, so use i32 for
// setcc operations results (slt, sgt, ...).
setBooleanContents(ZeroOrOneBooleanContent);
setBooleanVectorContents(ZeroOrNegativeOneBooleanContent);
// The cmp.cond.fmt instruction in MIPS32r6/MIPS64r6 uses 0 and -1 like MSA
// does. Integer booleans still use 0 and 1.
if (Subtarget.hasMips32r6())
setBooleanContents(ZeroOrOneBooleanContent,
ZeroOrNegativeOneBooleanContent);
// Load extented operations for i1 types must be promoted
for (MVT VT : MVT::integer_valuetypes()) {
setLoadExtAction(ISD::EXTLOAD, VT, MVT::i1, Promote);
setLoadExtAction(ISD::ZEXTLOAD, VT, MVT::i1, Promote);
setLoadExtAction(ISD::SEXTLOAD, VT, MVT::i1, Promote);
}
// MIPS doesn't have extending float->double load/store
for (MVT VT : MVT::fp_valuetypes())
setLoadExtAction(ISD::EXTLOAD, VT, MVT::f32, Expand);
setTruncStoreAction(MVT::f64, MVT::f32, Expand);
// Used by legalize types to correctly generate the setcc result.
// Without this, every float setcc comes with a AND/OR with the result,
// we don't want this, since the fpcmp result goes to a flag register,
// which is used implicitly by brcond and select operations.
AddPromotedToType(ISD::SETCC, MVT::i1, MVT::i32);
// Mips Custom Operations
setOperationAction(ISD::BR_JT, MVT::Other, Custom);
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::BlockAddress, MVT::i32, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i32, Custom);
setOperationAction(ISD::JumpTable, MVT::i32, Custom);
setOperationAction(ISD::ConstantPool, MVT::i32, Custom);
setOperationAction(ISD::SELECT, MVT::f32, Custom);
setOperationAction(ISD::SELECT, MVT::f64, Custom);
setOperationAction(ISD::SELECT, MVT::i32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
setOperationAction(ISD::SETCC, MVT::f32, Custom);
setOperationAction(ISD::SETCC, MVT::f64, Custom);
setOperationAction(ISD::BRCOND, MVT::Other, Custom);
setOperationAction(ISD::FCOPYSIGN, MVT::f32, Custom);
setOperationAction(ISD::FCOPYSIGN, MVT::f64, Custom);
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
if (Subtarget.isGP64bit()) {
setOperationAction(ISD::GlobalAddress, MVT::i64, Custom);
setOperationAction(ISD::BlockAddress, MVT::i64, Custom);
setOperationAction(ISD::GlobalTLSAddress, MVT::i64, Custom);
setOperationAction(ISD::JumpTable, MVT::i64, Custom);
setOperationAction(ISD::ConstantPool, MVT::i64, Custom);
setOperationAction(ISD::SELECT, MVT::i64, Custom);
setOperationAction(ISD::LOAD, MVT::i64, Custom);
setOperationAction(ISD::STORE, MVT::i64, Custom);
setOperationAction(ISD::FP_TO_SINT, MVT::i64, Custom);
setOperationAction(ISD::SHL_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i64, Custom);
setOperationAction(ISD::SRL_PARTS, MVT::i64, Custom);
}
if (!Subtarget.isGP64bit()) {
setOperationAction(ISD::SHL_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRA_PARTS, MVT::i32, Custom);
setOperationAction(ISD::SRL_PARTS, MVT::i32, Custom);
}
setOperationAction(ISD::ADD, MVT::i32, Custom);
if (Subtarget.isGP64bit())
setOperationAction(ISD::ADD, MVT::i64, Custom);
setOperationAction(ISD::SDIV, MVT::i32, Expand);
setOperationAction(ISD::SREM, MVT::i32, Expand);
setOperationAction(ISD::UDIV, MVT::i32, Expand);
setOperationAction(ISD::UREM, MVT::i32, Expand);
setOperationAction(ISD::SDIV, MVT::i64, Expand);
setOperationAction(ISD::SREM, MVT::i64, Expand);
setOperationAction(ISD::UDIV, MVT::i64, Expand);
setOperationAction(ISD::UREM, MVT::i64, Expand);
// Operations not directly supported by Mips.
setOperationAction(ISD::BR_CC, MVT::f32, Expand);
setOperationAction(ISD::BR_CC, MVT::f64, Expand);
setOperationAction(ISD::BR_CC, MVT::i32, Expand);
setOperationAction(ISD::BR_CC, MVT::i64, Expand);
setOperationAction(ISD::SELECT_CC, MVT::i32, Expand);
setOperationAction(ISD::SELECT_CC, MVT::i64, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i64, Expand);
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
setOperationAction(ISD::FP_TO_UINT, MVT::i64, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1, Expand);
if (Subtarget.hasCnMips()) {
setOperationAction(ISD::CTPOP, MVT::i32, Legal);
setOperationAction(ISD::CTPOP, MVT::i64, Legal);
} else {
setOperationAction(ISD::CTPOP, MVT::i32, Expand);
setOperationAction(ISD::CTPOP, MVT::i64, Expand);
}
setOperationAction(ISD::CTTZ, MVT::i32, Expand);
setOperationAction(ISD::CTTZ, MVT::i64, Expand);
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i32, Expand);
setOperationAction(ISD::CTTZ_ZERO_UNDEF, MVT::i64, Expand);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i32, Expand);
setOperationAction(ISD::CTLZ_ZERO_UNDEF, MVT::i64, Expand);
setOperationAction(ISD::ROTL, MVT::i32, Expand);
setOperationAction(ISD::ROTL, MVT::i64, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i32, Expand);
setOperationAction(ISD::DYNAMIC_STACKALLOC, MVT::i64, Expand);
if (!Subtarget.hasMips32r2())
setOperationAction(ISD::ROTR, MVT::i32, Expand);
if (!Subtarget.hasMips64r2())
setOperationAction(ISD::ROTR, MVT::i64, Expand);
setOperationAction(ISD::FSIN, MVT::f32, Expand);
setOperationAction(ISD::FSIN, MVT::f64, Expand);
setOperationAction(ISD::FCOS, MVT::f32, Expand);
setOperationAction(ISD::FCOS, MVT::f64, Expand);
setOperationAction(ISD::FSINCOS, MVT::f32, Expand);
setOperationAction(ISD::FSINCOS, MVT::f64, Expand);
setOperationAction(ISD::FPOWI, MVT::f32, Expand);
setOperationAction(ISD::FPOW, MVT::f32, Expand);
setOperationAction(ISD::FPOW, MVT::f64, Expand);
setOperationAction(ISD::FLOG, MVT::f32, Expand);
setOperationAction(ISD::FLOG2, MVT::f32, Expand);
setOperationAction(ISD::FLOG10, MVT::f32, Expand);
setOperationAction(ISD::FEXP, MVT::f32, Expand);
setOperationAction(ISD::FMA, MVT::f32, Expand);
setOperationAction(ISD::FMA, MVT::f64, Expand);
setOperationAction(ISD::FREM, MVT::f32, Expand);
setOperationAction(ISD::FREM, MVT::f64, Expand);
setOperationAction(ISD::EH_RETURN, MVT::Other, Custom);
setOperationAction(ISD::VASTART, MVT::Other, Custom);
setOperationAction(ISD::VAARG, MVT::Other, Custom);
setOperationAction(ISD::VACOPY, MVT::Other, Expand);
setOperationAction(ISD::VAEND, MVT::Other, Expand);
// Use the default for now
setOperationAction(ISD::STACKSAVE, MVT::Other, Expand);
setOperationAction(ISD::STACKRESTORE, MVT::Other, Expand);
setOperationAction(ISD::ATOMIC_LOAD, MVT::i32, Expand);
setOperationAction(ISD::ATOMIC_LOAD, MVT::i64, Expand);
setOperationAction(ISD::ATOMIC_STORE, MVT::i32, Expand);
setOperationAction(ISD::ATOMIC_STORE, MVT::i64, Expand);
setInsertFencesForAtomic(true);
if (!Subtarget.hasMips32r2()) {
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
}
// MIPS16 lacks MIPS32's clz and clo instructions.
if (!Subtarget.hasMips32() || Subtarget.inMips16Mode())
setOperationAction(ISD::CTLZ, MVT::i32, Expand);
if (!Subtarget.hasMips64())
setOperationAction(ISD::CTLZ, MVT::i64, Expand);
if (!Subtarget.hasMips32r2())
setOperationAction(ISD::BSWAP, MVT::i32, Expand);
if (!Subtarget.hasMips64r2())
setOperationAction(ISD::BSWAP, MVT::i64, Expand);
if (Subtarget.isGP64bit()) {
setLoadExtAction(ISD::SEXTLOAD, MVT::i64, MVT::i32, Custom);
setLoadExtAction(ISD::ZEXTLOAD, MVT::i64, MVT::i32, Custom);
setLoadExtAction(ISD::EXTLOAD, MVT::i64, MVT::i32, Custom);
setTruncStoreAction(MVT::i64, MVT::i32, Custom);
}
setOperationAction(ISD::TRAP, MVT::Other, Legal);
setTargetDAGCombine(ISD::SDIVREM);
setTargetDAGCombine(ISD::UDIVREM);
setTargetDAGCombine(ISD::SELECT);
setTargetDAGCombine(ISD::AND);
setTargetDAGCombine(ISD::OR);
setTargetDAGCombine(ISD::ADD);
setMinFunctionAlignment(Subtarget.isGP64bit() ? 3 : 2);
// The arguments on the stack are defined in terms of 4-byte slots on O32
// and 8-byte slots on N32/N64.
setMinStackArgumentAlignment(
(Subtarget.isABI_N32() || Subtarget.isABI_N64()) ? 8 : 4);
setStackPointerRegisterToSaveRestore(Subtarget.isABI_N64() ? Mips::SP_64
: Mips::SP);
setExceptionPointerRegister(Subtarget.isABI_N64() ? Mips::A0_64 : Mips::A0);
setExceptionSelectorRegister(Subtarget.isABI_N64() ? Mips::A1_64 : Mips::A1);
MaxStoresPerMemcpy = 16;
isMicroMips = Subtarget.inMicroMipsMode();
}
const MipsTargetLowering *MipsTargetLowering::create(const MipsTargetMachine &TM,
const MipsSubtarget &STI) {
if (STI.inMips16Mode())
return llvm::createMips16TargetLowering(TM, STI);
return llvm::createMipsSETargetLowering(TM, STI);
}
// Create a fast isel object.
FastISel *
MipsTargetLowering::createFastISel(FunctionLoweringInfo &funcInfo,
const TargetLibraryInfo *libInfo) const {
if (!EnableMipsFastISel)
return TargetLowering::createFastISel(funcInfo, libInfo);
return Mips::createFastISel(funcInfo, libInfo);
}
EVT MipsTargetLowering::getSetCCResultType(LLVMContext &, EVT VT) const {
if (!VT.isVector())
return MVT::i32;
return VT.changeVectorElementTypeToInteger();
}
static SDValue performDivRemCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const MipsSubtarget &Subtarget) {
if (DCI.isBeforeLegalizeOps())
return SDValue();
EVT Ty = N->getValueType(0);
unsigned LO = (Ty == MVT::i32) ? Mips::LO0 : Mips::LO0_64;
unsigned HI = (Ty == MVT::i32) ? Mips::HI0 : Mips::HI0_64;
unsigned Opc = N->getOpcode() == ISD::SDIVREM ? MipsISD::DivRem16 :
MipsISD::DivRemU16;
SDLoc DL(N);
SDValue DivRem = DAG.getNode(Opc, DL, MVT::Glue,
N->getOperand(0), N->getOperand(1));
SDValue InChain = DAG.getEntryNode();
SDValue InGlue = DivRem;
// insert MFLO
if (N->hasAnyUseOfValue(0)) {
SDValue CopyFromLo = DAG.getCopyFromReg(InChain, DL, LO, Ty,
InGlue);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 0), CopyFromLo);
InChain = CopyFromLo.getValue(1);
InGlue = CopyFromLo.getValue(2);
}
// insert MFHI
if (N->hasAnyUseOfValue(1)) {
SDValue CopyFromHi = DAG.getCopyFromReg(InChain, DL,
HI, Ty, InGlue);
DAG.ReplaceAllUsesOfValueWith(SDValue(N, 1), CopyFromHi);
}
return SDValue();
}
static Mips::CondCode condCodeToFCC(ISD::CondCode CC) {
switch (CC) {
default: llvm_unreachable("Unknown fp condition code!");
case ISD::SETEQ:
case ISD::SETOEQ: return Mips::FCOND_OEQ;
case ISD::SETUNE: return Mips::FCOND_UNE;
case ISD::SETLT:
case ISD::SETOLT: return Mips::FCOND_OLT;
case ISD::SETGT:
case ISD::SETOGT: return Mips::FCOND_OGT;
case ISD::SETLE:
case ISD::SETOLE: return Mips::FCOND_OLE;
case ISD::SETGE:
case ISD::SETOGE: return Mips::FCOND_OGE;
case ISD::SETULT: return Mips::FCOND_ULT;
case ISD::SETULE: return Mips::FCOND_ULE;
case ISD::SETUGT: return Mips::FCOND_UGT;
case ISD::SETUGE: return Mips::FCOND_UGE;
case ISD::SETUO: return Mips::FCOND_UN;
case ISD::SETO: return Mips::FCOND_OR;
case ISD::SETNE:
case ISD::SETONE: return Mips::FCOND_ONE;
case ISD::SETUEQ: return Mips::FCOND_UEQ;
}
}
/// This function returns true if the floating point conditional branches and
/// conditional moves which use condition code CC should be inverted.
static bool invertFPCondCodeUser(Mips::CondCode CC) {
if (CC >= Mips::FCOND_F && CC <= Mips::FCOND_NGT)
return false;
assert((CC >= Mips::FCOND_T && CC <= Mips::FCOND_GT) &&
"Illegal Condition Code");
return true;
}
// Creates and returns an FPCmp node from a setcc node.
// Returns Op if setcc is not a floating point comparison.
static SDValue createFPCmp(SelectionDAG &DAG, const SDValue &Op) {
// must be a SETCC node
if (Op.getOpcode() != ISD::SETCC)
return Op;
SDValue LHS = Op.getOperand(0);
if (!LHS.getValueType().isFloatingPoint())
return Op;
SDValue RHS = Op.getOperand(1);
SDLoc DL(Op);
// Assume the 3rd operand is a CondCodeSDNode. Add code to check the type of
// node if necessary.
ISD::CondCode CC = cast<CondCodeSDNode>(Op.getOperand(2))->get();
return DAG.getNode(MipsISD::FPCmp, DL, MVT::Glue, LHS, RHS,
DAG.getConstant(condCodeToFCC(CC), MVT::i32));
}
// Creates and returns a CMovFPT/F node.
static SDValue createCMovFP(SelectionDAG &DAG, SDValue Cond, SDValue True,
SDValue False, SDLoc DL) {
ConstantSDNode *CC = cast<ConstantSDNode>(Cond.getOperand(2));
bool invert = invertFPCondCodeUser((Mips::CondCode)CC->getSExtValue());
SDValue FCC0 = DAG.getRegister(Mips::FCC0, MVT::i32);
return DAG.getNode((invert ? MipsISD::CMovFP_F : MipsISD::CMovFP_T), DL,
True.getValueType(), True, FCC0, False, Cond);
}
static SDValue performSELECTCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const MipsSubtarget &Subtarget) {
if (DCI.isBeforeLegalizeOps())
return SDValue();
SDValue SetCC = N->getOperand(0);
if ((SetCC.getOpcode() != ISD::SETCC) ||
!SetCC.getOperand(0).getValueType().isInteger())
return SDValue();
SDValue False = N->getOperand(2);
EVT FalseTy = False.getValueType();
if (!FalseTy.isInteger())
return SDValue();
ConstantSDNode *FalseC = dyn_cast<ConstantSDNode>(False);
// If the RHS (False) is 0, we swap the order of the operands
// of ISD::SELECT (obviously also inverting the condition) so that we can
// take advantage of conditional moves using the $0 register.
// Example:
// return (a != 0) ? x : 0;
// load $reg, x
// movz $reg, $0, a
if (!FalseC)
return SDValue();
const SDLoc DL(N);
if (!FalseC->getZExtValue()) {
ISD::CondCode CC = cast<CondCodeSDNode>(SetCC.getOperand(2))->get();
SDValue True = N->getOperand(1);
SetCC = DAG.getSetCC(DL, SetCC.getValueType(), SetCC.getOperand(0),
SetCC.getOperand(1), ISD::getSetCCInverse(CC, true));
return DAG.getNode(ISD::SELECT, DL, FalseTy, SetCC, False, True);
}
// If both operands are integer constants there's a possibility that we
// can do some interesting optimizations.
SDValue True = N->getOperand(1);
ConstantSDNode *TrueC = dyn_cast<ConstantSDNode>(True);
if (!TrueC || !True.getValueType().isInteger())
return SDValue();
// We'll also ignore MVT::i64 operands as this optimizations proves
// to be ineffective because of the required sign extensions as the result
// of a SETCC operator is always MVT::i32 for non-vector types.
if (True.getValueType() == MVT::i64)
return SDValue();
int64_t Diff = TrueC->getSExtValue() - FalseC->getSExtValue();
// 1) (a < x) ? y : y-1
// slti $reg1, a, x
// addiu $reg2, $reg1, y-1
if (Diff == 1)
return DAG.getNode(ISD::ADD, DL, SetCC.getValueType(), SetCC, False);
// 2) (a < x) ? y-1 : y
// slti $reg1, a, x
// xor $reg1, $reg1, 1
// addiu $reg2, $reg1, y-1
if (Diff == -1) {
ISD::CondCode CC = cast<CondCodeSDNode>(SetCC.getOperand(2))->get();
SetCC = DAG.getSetCC(DL, SetCC.getValueType(), SetCC.getOperand(0),
SetCC.getOperand(1), ISD::getSetCCInverse(CC, true));
return DAG.getNode(ISD::ADD, DL, SetCC.getValueType(), SetCC, True);
}
// Couldn't optimize.
return SDValue();
}
static SDValue performANDCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const MipsSubtarget &Subtarget) {
// Pattern match EXT.
// $dst = and ((sra or srl) $src , pos), (2**size - 1)
// => ext $dst, $src, size, pos
if (DCI.isBeforeLegalizeOps() || !Subtarget.hasExtractInsert())
return SDValue();
SDValue ShiftRight = N->getOperand(0), Mask = N->getOperand(1);
unsigned ShiftRightOpc = ShiftRight.getOpcode();
// Op's first operand must be a shift right.
if (ShiftRightOpc != ISD::SRA && ShiftRightOpc != ISD::SRL)
return SDValue();
// The second operand of the shift must be an immediate.
ConstantSDNode *CN;
if (!(CN = dyn_cast<ConstantSDNode>(ShiftRight.getOperand(1))))
return SDValue();
uint64_t Pos = CN->getZExtValue();
uint64_t SMPos, SMSize;
// Op's second operand must be a shifted mask.
if (!(CN = dyn_cast<ConstantSDNode>(Mask)) ||
!isShiftedMask(CN->getZExtValue(), SMPos, SMSize))
return SDValue();
// Return if the shifted mask does not start at bit 0 or the sum of its size
// and Pos exceeds the word's size.
EVT ValTy = N->getValueType(0);
if (SMPos != 0 || Pos + SMSize > ValTy.getSizeInBits())
return SDValue();
return DAG.getNode(MipsISD::Ext, SDLoc(N), ValTy,
ShiftRight.getOperand(0), DAG.getConstant(Pos, MVT::i32),
DAG.getConstant(SMSize, MVT::i32));
}
static SDValue performORCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const MipsSubtarget &Subtarget) {
// Pattern match INS.
// $dst = or (and $src1 , mask0), (and (shl $src, pos), mask1),
// where mask1 = (2**size - 1) << pos, mask0 = ~mask1
// => ins $dst, $src, size, pos, $src1
if (DCI.isBeforeLegalizeOps() || !Subtarget.hasExtractInsert())
return SDValue();
SDValue And0 = N->getOperand(0), And1 = N->getOperand(1);
uint64_t SMPos0, SMSize0, SMPos1, SMSize1;
ConstantSDNode *CN;
// See if Op's first operand matches (and $src1 , mask0).
if (And0.getOpcode() != ISD::AND)
return SDValue();
if (!(CN = dyn_cast<ConstantSDNode>(And0.getOperand(1))) ||
!isShiftedMask(~CN->getSExtValue(), SMPos0, SMSize0))
return SDValue();
// See if Op's second operand matches (and (shl $src, pos), mask1).
if (And1.getOpcode() != ISD::AND)
return SDValue();
if (!(CN = dyn_cast<ConstantSDNode>(And1.getOperand(1))) ||
!isShiftedMask(CN->getZExtValue(), SMPos1, SMSize1))
return SDValue();
// The shift masks must have the same position and size.
if (SMPos0 != SMPos1 || SMSize0 != SMSize1)
return SDValue();
SDValue Shl = And1.getOperand(0);
if (Shl.getOpcode() != ISD::SHL)
return SDValue();
if (!(CN = dyn_cast<ConstantSDNode>(Shl.getOperand(1))))
return SDValue();
unsigned Shamt = CN->getZExtValue();
// Return if the shift amount and the first bit position of mask are not the
// same.
EVT ValTy = N->getValueType(0);
if ((Shamt != SMPos0) || (SMPos0 + SMSize0 > ValTy.getSizeInBits()))
return SDValue();
return DAG.getNode(MipsISD::Ins, SDLoc(N), ValTy, Shl.getOperand(0),
DAG.getConstant(SMPos0, MVT::i32),
DAG.getConstant(SMSize0, MVT::i32), And0.getOperand(0));
}
static SDValue performADDCombine(SDNode *N, SelectionDAG &DAG,
TargetLowering::DAGCombinerInfo &DCI,
const MipsSubtarget &Subtarget) {
// (add v0, (add v1, abs_lo(tjt))) => (add (add v0, v1), abs_lo(tjt))
if (DCI.isBeforeLegalizeOps())
return SDValue();
SDValue Add = N->getOperand(1);
if (Add.getOpcode() != ISD::ADD)
return SDValue();
SDValue Lo = Add.getOperand(1);
if ((Lo.getOpcode() != MipsISD::Lo) ||
(Lo.getOperand(0).getOpcode() != ISD::TargetJumpTable))
return SDValue();
EVT ValTy = N->getValueType(0);
SDLoc DL(N);
SDValue Add1 = DAG.getNode(ISD::ADD, DL, ValTy, N->getOperand(0),
Add.getOperand(0));
return DAG.getNode(ISD::ADD, DL, ValTy, Add1, Lo);
}
SDValue MipsTargetLowering::PerformDAGCombine(SDNode *N, DAGCombinerInfo &DCI)
const {
SelectionDAG &DAG = DCI.DAG;
unsigned Opc = N->getOpcode();
switch (Opc) {
default: break;
case ISD::SDIVREM:
case ISD::UDIVREM:
return performDivRemCombine(N, DAG, DCI, Subtarget);
case ISD::SELECT:
return performSELECTCombine(N, DAG, DCI, Subtarget);
case ISD::AND:
return performANDCombine(N, DAG, DCI, Subtarget);
case ISD::OR:
return performORCombine(N, DAG, DCI, Subtarget);
case ISD::ADD:
return performADDCombine(N, DAG, DCI, Subtarget);
}
return SDValue();
}
void
MipsTargetLowering::LowerOperationWrapper(SDNode *N,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const {
SDValue Res = LowerOperation(SDValue(N, 0), DAG);
for (unsigned I = 0, E = Res->getNumValues(); I != E; ++I)
Results.push_back(Res.getValue(I));
}
void
MipsTargetLowering::ReplaceNodeResults(SDNode *N,
SmallVectorImpl<SDValue> &Results,
SelectionDAG &DAG) const {
return LowerOperationWrapper(N, Results, DAG);
}
SDValue MipsTargetLowering::
LowerOperation(SDValue Op, SelectionDAG &DAG) const
{
switch (Op.getOpcode())
{
case ISD::BR_JT: return lowerBR_JT(Op, DAG);
case ISD::BRCOND: return lowerBRCOND(Op, DAG);
case ISD::ConstantPool: return lowerConstantPool(Op, DAG);
case ISD::GlobalAddress: return lowerGlobalAddress(Op, DAG);
case ISD::BlockAddress: return lowerBlockAddress(Op, DAG);
case ISD::GlobalTLSAddress: return lowerGlobalTLSAddress(Op, DAG);
case ISD::JumpTable: return lowerJumpTable(Op, DAG);
case ISD::SELECT: return lowerSELECT(Op, DAG);
case ISD::SELECT_CC: return lowerSELECT_CC(Op, DAG);
case ISD::SETCC: return lowerSETCC(Op, DAG);
case ISD::VASTART: return lowerVASTART(Op, DAG);
case ISD::VAARG: return lowerVAARG(Op, DAG);
case ISD::FCOPYSIGN: return lowerFCOPYSIGN(Op, DAG);
case ISD::FRAMEADDR: return lowerFRAMEADDR(Op, DAG);
case ISD::RETURNADDR: return lowerRETURNADDR(Op, DAG);
case ISD::EH_RETURN: return lowerEH_RETURN(Op, DAG);
case ISD::ATOMIC_FENCE: return lowerATOMIC_FENCE(Op, DAG);
case ISD::SHL_PARTS: return lowerShiftLeftParts(Op, DAG);
case ISD::SRA_PARTS: return lowerShiftRightParts(Op, DAG, true);
case ISD::SRL_PARTS: return lowerShiftRightParts(Op, DAG, false);
case ISD::LOAD: return lowerLOAD(Op, DAG);
case ISD::STORE: return lowerSTORE(Op, DAG);
case ISD::ADD: return lowerADD(Op, DAG);
case ISD::FP_TO_SINT: return lowerFP_TO_SINT(Op, DAG);
}
return SDValue();
}
//===----------------------------------------------------------------------===//
// Lower helper functions
//===----------------------------------------------------------------------===//
// addLiveIn - This helper function adds the specified physical register to the
// MachineFunction as a live in value. It also creates a corresponding
// virtual register for it.
static unsigned
addLiveIn(MachineFunction &MF, unsigned PReg, const TargetRegisterClass *RC)
{
unsigned VReg = MF.getRegInfo().createVirtualRegister(RC);
MF.getRegInfo().addLiveIn(PReg, VReg);
return VReg;
}
static MachineBasicBlock *insertDivByZeroTrap(MachineInstr *MI,
MachineBasicBlock &MBB,
const TargetInstrInfo &TII,
bool Is64Bit) {
if (NoZeroDivCheck)
return &MBB;
// Insert instruction "teq $divisor_reg, $zero, 7".
MachineBasicBlock::iterator I(MI);
MachineInstrBuilder MIB;
MachineOperand &Divisor = MI->getOperand(2);
MIB = BuildMI(MBB, std::next(I), MI->getDebugLoc(), TII.get(Mips::TEQ))
.addReg(Divisor.getReg(), getKillRegState(Divisor.isKill()))
.addReg(Mips::ZERO).addImm(7);
// Use the 32-bit sub-register if this is a 64-bit division.
if (Is64Bit)
MIB->getOperand(0).setSubReg(Mips::sub_32);
// Clear Divisor's kill flag.
Divisor.setIsKill(false);
// We would normally delete the original instruction here but in this case
// we only needed to inject an additional instruction rather than replace it.
return &MBB;
}
MachineBasicBlock *
MipsTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
MachineBasicBlock *BB) const {
switch (MI->getOpcode()) {
default:
llvm_unreachable("Unexpected instr type to insert");
case Mips::ATOMIC_LOAD_ADD_I8:
return emitAtomicBinaryPartword(MI, BB, 1, Mips::ADDu);
case Mips::ATOMIC_LOAD_ADD_I16:
return emitAtomicBinaryPartword(MI, BB, 2, Mips::ADDu);
case Mips::ATOMIC_LOAD_ADD_I32:
return emitAtomicBinary(MI, BB, 4, Mips::ADDu);
case Mips::ATOMIC_LOAD_ADD_I64:
return emitAtomicBinary(MI, BB, 8, Mips::DADDu);
case Mips::ATOMIC_LOAD_AND_I8:
return emitAtomicBinaryPartword(MI, BB, 1, Mips::AND);
case Mips::ATOMIC_LOAD_AND_I16:
return emitAtomicBinaryPartword(MI, BB, 2, Mips::AND);
case Mips::ATOMIC_LOAD_AND_I32:
return emitAtomicBinary(MI, BB, 4, Mips::AND);
case Mips::ATOMIC_LOAD_AND_I64:
return emitAtomicBinary(MI, BB, 8, Mips::AND64);
case Mips::ATOMIC_LOAD_OR_I8:
return emitAtomicBinaryPartword(MI, BB, 1, Mips::OR);
case Mips::ATOMIC_LOAD_OR_I16:
return emitAtomicBinaryPartword(MI, BB, 2, Mips::OR);
case Mips::ATOMIC_LOAD_OR_I32:
return emitAtomicBinary(MI, BB, 4, Mips::OR);
case Mips::ATOMIC_LOAD_OR_I64:
return emitAtomicBinary(MI, BB, 8, Mips::OR64);
case Mips::ATOMIC_LOAD_XOR_I8:
return emitAtomicBinaryPartword(MI, BB, 1, Mips::XOR);
case Mips::ATOMIC_LOAD_XOR_I16:
return emitAtomicBinaryPartword(MI, BB, 2, Mips::XOR);
case Mips::ATOMIC_LOAD_XOR_I32:
return emitAtomicBinary(MI, BB, 4, Mips::XOR);
case Mips::ATOMIC_LOAD_XOR_I64:
return emitAtomicBinary(MI, BB, 8, Mips::XOR64);
case Mips::ATOMIC_LOAD_NAND_I8:
return emitAtomicBinaryPartword(MI, BB, 1, 0, true);
case Mips::ATOMIC_LOAD_NAND_I16:
return emitAtomicBinaryPartword(MI, BB, 2, 0, true);
case Mips::ATOMIC_LOAD_NAND_I32:
return emitAtomicBinary(MI, BB, 4, 0, true);
case Mips::ATOMIC_LOAD_NAND_I64:
return emitAtomicBinary(MI, BB, 8, 0, true);
case Mips::ATOMIC_LOAD_SUB_I8:
return emitAtomicBinaryPartword(MI, BB, 1, Mips::SUBu);
case Mips::ATOMIC_LOAD_SUB_I16:
return emitAtomicBinaryPartword(MI, BB, 2, Mips::SUBu);
case Mips::ATOMIC_LOAD_SUB_I32:
return emitAtomicBinary(MI, BB, 4, Mips::SUBu);
case Mips::ATOMIC_LOAD_SUB_I64:
return emitAtomicBinary(MI, BB, 8, Mips::DSUBu);
case Mips::ATOMIC_SWAP_I8:
return emitAtomicBinaryPartword(MI, BB, 1, 0);
case Mips::ATOMIC_SWAP_I16:
return emitAtomicBinaryPartword(MI, BB, 2, 0);
case Mips::ATOMIC_SWAP_I32:
return emitAtomicBinary(MI, BB, 4, 0);
case Mips::ATOMIC_SWAP_I64:
return emitAtomicBinary(MI, BB, 8, 0);
case Mips::ATOMIC_CMP_SWAP_I8:
return emitAtomicCmpSwapPartword(MI, BB, 1);
case Mips::ATOMIC_CMP_SWAP_I16:
return emitAtomicCmpSwapPartword(MI, BB, 2);
case Mips::ATOMIC_CMP_SWAP_I32:
return emitAtomicCmpSwap(MI, BB, 4);
case Mips::ATOMIC_CMP_SWAP_I64:
return emitAtomicCmpSwap(MI, BB, 8);
case Mips::PseudoSDIV:
case Mips::PseudoUDIV:
case Mips::DIV:
case Mips::DIVU:
case Mips::MOD:
case Mips::MODU:
return insertDivByZeroTrap(
MI, *BB, *getTargetMachine().getSubtargetImpl()->getInstrInfo(), false);
case Mips::PseudoDSDIV:
case Mips::PseudoDUDIV:
case Mips::DDIV:
case Mips::DDIVU:
case Mips::DMOD:
case Mips::DMODU:
return insertDivByZeroTrap(
MI, *BB, *getTargetMachine().getSubtargetImpl()->getInstrInfo(), true);
case Mips::SEL_D:
return emitSEL_D(MI, BB);
case Mips::PseudoSELECT_I:
case Mips::PseudoSELECT_I64:
case Mips::PseudoSELECT_S:
case Mips::PseudoSELECT_D32:
case Mips::PseudoSELECT_D64:
return emitPseudoSELECT(MI, BB, false, Mips::BNE);
case Mips::PseudoSELECTFP_F_I:
case Mips::PseudoSELECTFP_F_I64:
case Mips::PseudoSELECTFP_F_S:
case Mips::PseudoSELECTFP_F_D32:
case Mips::PseudoSELECTFP_F_D64:
return emitPseudoSELECT(MI, BB, true, Mips::BC1F);
case Mips::PseudoSELECTFP_T_I:
case Mips::PseudoSELECTFP_T_I64:
case Mips::PseudoSELECTFP_T_S:
case Mips::PseudoSELECTFP_T_D32:
case Mips::PseudoSELECTFP_T_D64:
return emitPseudoSELECT(MI, BB, true, Mips::BC1T);
}
}
// This function also handles Mips::ATOMIC_SWAP_I32 (when BinOpcode == 0), and
// Mips::ATOMIC_LOAD_NAND_I32 (when Nand == true)
MachineBasicBlock *
MipsTargetLowering::emitAtomicBinary(MachineInstr *MI, MachineBasicBlock *BB,
unsigned Size, unsigned BinOpcode,
bool Nand) const {
assert((Size == 4 || Size == 8) && "Unsupported size for EmitAtomicBinary.");
MachineFunction *MF = BB->getParent();
MachineRegisterInfo &RegInfo = MF->getRegInfo();
const TargetRegisterClass *RC = getRegClassFor(MVT::getIntegerVT(Size * 8));
const TargetInstrInfo *TII =
getTargetMachine().getSubtargetImpl()->getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
unsigned LL, SC, AND, NOR, ZERO, BEQ;
if (Size == 4) {
if (isMicroMips) {
LL = Mips::LL_MM;
SC = Mips::SC_MM;
} else {
LL = Subtarget.hasMips32r6() ? Mips::LL_R6 : Mips::LL;
SC = Subtarget.hasMips32r6() ? Mips::SC_R6 : Mips::SC;
}
AND = Mips::AND;
NOR = Mips::NOR;
ZERO = Mips::ZERO;
BEQ = Mips::BEQ;
} else {
LL = Subtarget.hasMips64r6() ? Mips::LLD_R6 : Mips::LLD;
SC = Subtarget.hasMips64r6() ? Mips::SCD_R6 : Mips::SCD;
AND = Mips::AND64;
NOR = Mips::NOR64;
ZERO = Mips::ZERO_64;
BEQ = Mips::BEQ64;
}
unsigned OldVal = MI->getOperand(0).getReg();
unsigned Ptr = MI->getOperand(1).getReg();
unsigned Incr = MI->getOperand(2).getReg();
unsigned StoreVal = RegInfo.createVirtualRegister(RC);
unsigned AndRes = RegInfo.createVirtualRegister(RC);
unsigned Success = RegInfo.createVirtualRegister(RC);
// insert new blocks after the current block
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineFunction::iterator It = BB;
++It;
MF->insert(It, loopMBB);
MF->insert(It, exitMBB);
// Transfer the remainder of BB and its successor edges to exitMBB.
exitMBB->splice(exitMBB->begin(), BB,
std::next(MachineBasicBlock::iterator(MI)), BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
// thisMBB:
// ...
// fallthrough --> loopMBB
BB->addSuccessor(loopMBB);
loopMBB->addSuccessor(loopMBB);
loopMBB->addSuccessor(exitMBB);
// loopMBB:
// ll oldval, 0(ptr)
// <binop> storeval, oldval, incr
// sc success, storeval, 0(ptr)
// beq success, $0, loopMBB
BB = loopMBB;
BuildMI(BB, DL, TII->get(LL), OldVal).addReg(Ptr).addImm(0);
if (Nand) {
// and andres, oldval, incr
// nor storeval, $0, andres
BuildMI(BB, DL, TII->get(AND), AndRes).addReg(OldVal).addReg(Incr);
BuildMI(BB, DL, TII->get(NOR), StoreVal).addReg(ZERO).addReg(AndRes);
} else if (BinOpcode) {
// <binop> storeval, oldval, incr
BuildMI(BB, DL, TII->get(BinOpcode), StoreVal).addReg(OldVal).addReg(Incr);
} else {
StoreVal = Incr;
}
BuildMI(BB, DL, TII->get(SC), Success).addReg(StoreVal).addReg(Ptr).addImm(0);
BuildMI(BB, DL, TII->get(BEQ)).addReg(Success).addReg(ZERO).addMBB(loopMBB);
MI->eraseFromParent(); // The instruction is gone now.
return exitMBB;
}
MachineBasicBlock *MipsTargetLowering::emitSignExtendToI32InReg(
MachineInstr *MI, MachineBasicBlock *BB, unsigned Size, unsigned DstReg,
unsigned SrcReg) const {
const TargetInstrInfo *TII =
getTargetMachine().getSubtargetImpl()->getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
if (Subtarget.hasMips32r2() && Size == 1) {
BuildMI(BB, DL, TII->get(Mips::SEB), DstReg).addReg(SrcReg);
return BB;
}
if (Subtarget.hasMips32r2() && Size == 2) {
BuildMI(BB, DL, TII->get(Mips::SEH), DstReg).addReg(SrcReg);
return BB;
}
MachineFunction *MF = BB->getParent();
MachineRegisterInfo &RegInfo = MF->getRegInfo();
const TargetRegisterClass *RC = getRegClassFor(MVT::i32);
unsigned ScrReg = RegInfo.createVirtualRegister(RC);
assert(Size < 32);
int64_t ShiftImm = 32 - (Size * 8);
BuildMI(BB, DL, TII->get(Mips::SLL), ScrReg).addReg(SrcReg).addImm(ShiftImm);
BuildMI(BB, DL, TII->get(Mips::SRA), DstReg).addReg(ScrReg).addImm(ShiftImm);
return BB;
}
MachineBasicBlock *MipsTargetLowering::emitAtomicBinaryPartword(
MachineInstr *MI, MachineBasicBlock *BB, unsigned Size, unsigned BinOpcode,
bool Nand) const {
assert((Size == 1 || Size == 2) &&
"Unsupported size for EmitAtomicBinaryPartial.");
MachineFunction *MF = BB->getParent();
MachineRegisterInfo &RegInfo = MF->getRegInfo();
const TargetRegisterClass *RC = getRegClassFor(MVT::i32);
const TargetInstrInfo *TII =
getTargetMachine().getSubtargetImpl()->getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
unsigned Dest = MI->getOperand(0).getReg();
unsigned Ptr = MI->getOperand(1).getReg();
unsigned Incr = MI->getOperand(2).getReg();
unsigned AlignedAddr = RegInfo.createVirtualRegister(RC);
unsigned ShiftAmt = RegInfo.createVirtualRegister(RC);
unsigned Mask = RegInfo.createVirtualRegister(RC);
unsigned Mask2 = RegInfo.createVirtualRegister(RC);
unsigned NewVal = RegInfo.createVirtualRegister(RC);
unsigned OldVal = RegInfo.createVirtualRegister(RC);
unsigned Incr2 = RegInfo.createVirtualRegister(RC);
unsigned MaskLSB2 = RegInfo.createVirtualRegister(RC);
unsigned PtrLSB2 = RegInfo.createVirtualRegister(RC);
unsigned MaskUpper = RegInfo.createVirtualRegister(RC);
unsigned AndRes = RegInfo.createVirtualRegister(RC);
unsigned BinOpRes = RegInfo.createVirtualRegister(RC);
unsigned MaskedOldVal0 = RegInfo.createVirtualRegister(RC);
unsigned StoreVal = RegInfo.createVirtualRegister(RC);
unsigned MaskedOldVal1 = RegInfo.createVirtualRegister(RC);
unsigned SrlRes = RegInfo.createVirtualRegister(RC);
unsigned Success = RegInfo.createVirtualRegister(RC);
// insert new blocks after the current block
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineBasicBlock *loopMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineFunction::iterator It = BB;
++It;
MF->insert(It, loopMBB);
MF->insert(It, sinkMBB);
MF->insert(It, exitMBB);
// Transfer the remainder of BB and its successor edges to exitMBB.
exitMBB->splice(exitMBB->begin(), BB,
std::next(MachineBasicBlock::iterator(MI)), BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
BB->addSuccessor(loopMBB);
loopMBB->addSuccessor(loopMBB);
loopMBB->addSuccessor(sinkMBB);
sinkMBB->addSuccessor(exitMBB);
// thisMBB:
// addiu masklsb2,$0,-4 # 0xfffffffc
// and alignedaddr,ptr,masklsb2
// andi ptrlsb2,ptr,3
// sll shiftamt,ptrlsb2,3
// ori maskupper,$0,255 # 0xff
// sll mask,maskupper,shiftamt
// nor mask2,$0,mask
// sll incr2,incr,shiftamt
int64_t MaskImm = (Size == 1) ? 255 : 65535;
BuildMI(BB, DL, TII->get(Mips::ADDiu), MaskLSB2)
.addReg(Mips::ZERO).addImm(-4);
BuildMI(BB, DL, TII->get(Mips::AND), AlignedAddr)
.addReg(Ptr).addReg(MaskLSB2);
BuildMI(BB, DL, TII->get(Mips::ANDi), PtrLSB2).addReg(Ptr).addImm(3);
if (Subtarget.isLittle()) {
BuildMI(BB, DL, TII->get(Mips::SLL), ShiftAmt).addReg(PtrLSB2).addImm(3);
} else {
unsigned Off = RegInfo.createVirtualRegister(RC);
BuildMI(BB, DL, TII->get(Mips::XORi), Off)
.addReg(PtrLSB2).addImm((Size == 1) ? 3 : 2);
BuildMI(BB, DL, TII->get(Mips::SLL), ShiftAmt).addReg(Off).addImm(3);
}
BuildMI(BB, DL, TII->get(Mips::ORi), MaskUpper)
.addReg(Mips::ZERO).addImm(MaskImm);
BuildMI(BB, DL, TII->get(Mips::SLLV), Mask)
.addReg(MaskUpper).addReg(ShiftAmt);
BuildMI(BB, DL, TII->get(Mips::NOR), Mask2).addReg(Mips::ZERO).addReg(Mask);
BuildMI(BB, DL, TII->get(Mips::SLLV), Incr2).addReg(Incr).addReg(ShiftAmt);
// atomic.load.binop
// loopMBB:
// ll oldval,0(alignedaddr)
// binop binopres,oldval,incr2
// and newval,binopres,mask
// and maskedoldval0,oldval,mask2
// or storeval,maskedoldval0,newval
// sc success,storeval,0(alignedaddr)
// beq success,$0,loopMBB
// atomic.swap
// loopMBB:
// ll oldval,0(alignedaddr)
// and newval,incr2,mask
// and maskedoldval0,oldval,mask2
// or storeval,maskedoldval0,newval
// sc success,storeval,0(alignedaddr)
// beq success,$0,loopMBB
BB = loopMBB;
unsigned LL = isMicroMips ? Mips::LL_MM : Mips::LL;
BuildMI(BB, DL, TII->get(LL), OldVal).addReg(AlignedAddr).addImm(0);
if (Nand) {
// and andres, oldval, incr2
// nor binopres, $0, andres
// and newval, binopres, mask
BuildMI(BB, DL, TII->get(Mips::AND), AndRes).addReg(OldVal).addReg(Incr2);
BuildMI(BB, DL, TII->get(Mips::NOR), BinOpRes)
.addReg(Mips::ZERO).addReg(AndRes);
BuildMI(BB, DL, TII->get(Mips::AND), NewVal).addReg(BinOpRes).addReg(Mask);
} else if (BinOpcode) {
// <binop> binopres, oldval, incr2
// and newval, binopres, mask
BuildMI(BB, DL, TII->get(BinOpcode), BinOpRes).addReg(OldVal).addReg(Incr2);
BuildMI(BB, DL, TII->get(Mips::AND), NewVal).addReg(BinOpRes).addReg(Mask);
} else { // atomic.swap
// and newval, incr2, mask
BuildMI(BB, DL, TII->get(Mips::AND), NewVal).addReg(Incr2).addReg(Mask);
}
BuildMI(BB, DL, TII->get(Mips::AND), MaskedOldVal0)
.addReg(OldVal).addReg(Mask2);
BuildMI(BB, DL, TII->get(Mips::OR), StoreVal)
.addReg(MaskedOldVal0).addReg(NewVal);
unsigned SC = isMicroMips ? Mips::SC_MM : Mips::SC;
BuildMI(BB, DL, TII->get(SC), Success)
.addReg(StoreVal).addReg(AlignedAddr).addImm(0);
BuildMI(BB, DL, TII->get(Mips::BEQ))
.addReg(Success).addReg(Mips::ZERO).addMBB(loopMBB);
// sinkMBB:
// and maskedoldval1,oldval,mask
// srl srlres,maskedoldval1,shiftamt
// sign_extend dest,srlres
BB = sinkMBB;
BuildMI(BB, DL, TII->get(Mips::AND), MaskedOldVal1)
.addReg(OldVal).addReg(Mask);
BuildMI(BB, DL, TII->get(Mips::SRLV), SrlRes)
.addReg(MaskedOldVal1).addReg(ShiftAmt);
BB = emitSignExtendToI32InReg(MI, BB, Size, Dest, SrlRes);
MI->eraseFromParent(); // The instruction is gone now.
return exitMBB;
}
MachineBasicBlock * MipsTargetLowering::emitAtomicCmpSwap(MachineInstr *MI,
MachineBasicBlock *BB,
unsigned Size) const {
assert((Size == 4 || Size == 8) && "Unsupported size for EmitAtomicCmpSwap.");
MachineFunction *MF = BB->getParent();
MachineRegisterInfo &RegInfo = MF->getRegInfo();
const TargetRegisterClass *RC = getRegClassFor(MVT::getIntegerVT(Size * 8));
const TargetInstrInfo *TII =
getTargetMachine().getSubtargetImpl()->getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
unsigned LL, SC, ZERO, BNE, BEQ;
if (Size == 4) {
LL = isMicroMips ? Mips::LL_MM : Mips::LL;
SC = isMicroMips ? Mips::SC_MM : Mips::SC;
ZERO = Mips::ZERO;
BNE = Mips::BNE;
BEQ = Mips::BEQ;
} else {
LL = Mips::LLD;
SC = Mips::SCD;
ZERO = Mips::ZERO_64;
BNE = Mips::BNE64;
BEQ = Mips::BEQ64;
}
unsigned Dest = MI->getOperand(0).getReg();
unsigned Ptr = MI->getOperand(1).getReg();
unsigned OldVal = MI->getOperand(2).getReg();
unsigned NewVal = MI->getOperand(3).getReg();
unsigned Success = RegInfo.createVirtualRegister(RC);
// insert new blocks after the current block
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineFunction::iterator It = BB;
++It;
MF->insert(It, loop1MBB);
MF->insert(It, loop2MBB);
MF->insert(It, exitMBB);
// Transfer the remainder of BB and its successor edges to exitMBB.
exitMBB->splice(exitMBB->begin(), BB,
std::next(MachineBasicBlock::iterator(MI)), BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
// thisMBB:
// ...
// fallthrough --> loop1MBB
BB->addSuccessor(loop1MBB);
loop1MBB->addSuccessor(exitMBB);
loop1MBB->addSuccessor(loop2MBB);
loop2MBB->addSuccessor(loop1MBB);
loop2MBB->addSuccessor(exitMBB);
// loop1MBB:
// ll dest, 0(ptr)
// bne dest, oldval, exitMBB
BB = loop1MBB;
BuildMI(BB, DL, TII->get(LL), Dest).addReg(Ptr).addImm(0);
BuildMI(BB, DL, TII->get(BNE))
.addReg(Dest).addReg(OldVal).addMBB(exitMBB);
// loop2MBB:
// sc success, newval, 0(ptr)
// beq success, $0, loop1MBB
BB = loop2MBB;
BuildMI(BB, DL, TII->get(SC), Success)
.addReg(NewVal).addReg(Ptr).addImm(0);
BuildMI(BB, DL, TII->get(BEQ))
.addReg(Success).addReg(ZERO).addMBB(loop1MBB);
MI->eraseFromParent(); // The instruction is gone now.
return exitMBB;
}
MachineBasicBlock *
MipsTargetLowering::emitAtomicCmpSwapPartword(MachineInstr *MI,
MachineBasicBlock *BB,
unsigned Size) const {
assert((Size == 1 || Size == 2) &&
"Unsupported size for EmitAtomicCmpSwapPartial.");
MachineFunction *MF = BB->getParent();
MachineRegisterInfo &RegInfo = MF->getRegInfo();
const TargetRegisterClass *RC = getRegClassFor(MVT::i32);
const TargetInstrInfo *TII =
getTargetMachine().getSubtargetImpl()->getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
unsigned Dest = MI->getOperand(0).getReg();
unsigned Ptr = MI->getOperand(1).getReg();
unsigned CmpVal = MI->getOperand(2).getReg();
unsigned NewVal = MI->getOperand(3).getReg();
unsigned AlignedAddr = RegInfo.createVirtualRegister(RC);
unsigned ShiftAmt = RegInfo.createVirtualRegister(RC);
unsigned Mask = RegInfo.createVirtualRegister(RC);
unsigned Mask2 = RegInfo.createVirtualRegister(RC);
unsigned ShiftedCmpVal = RegInfo.createVirtualRegister(RC);
unsigned OldVal = RegInfo.createVirtualRegister(RC);
unsigned MaskedOldVal0 = RegInfo.createVirtualRegister(RC);
unsigned ShiftedNewVal = RegInfo.createVirtualRegister(RC);
unsigned MaskLSB2 = RegInfo.createVirtualRegister(RC);
unsigned PtrLSB2 = RegInfo.createVirtualRegister(RC);
unsigned MaskUpper = RegInfo.createVirtualRegister(RC);
unsigned MaskedCmpVal = RegInfo.createVirtualRegister(RC);
unsigned MaskedNewVal = RegInfo.createVirtualRegister(RC);
unsigned MaskedOldVal1 = RegInfo.createVirtualRegister(RC);
unsigned StoreVal = RegInfo.createVirtualRegister(RC);
unsigned SrlRes = RegInfo.createVirtualRegister(RC);
unsigned Success = RegInfo.createVirtualRegister(RC);
// insert new blocks after the current block
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineBasicBlock *loop1MBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *loop2MBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *exitMBB = MF->CreateMachineBasicBlock(LLVM_BB);
MachineFunction::iterator It = BB;
++It;
MF->insert(It, loop1MBB);
MF->insert(It, loop2MBB);
MF->insert(It, sinkMBB);
MF->insert(It, exitMBB);
// Transfer the remainder of BB and its successor edges to exitMBB.
exitMBB->splice(exitMBB->begin(), BB,
std::next(MachineBasicBlock::iterator(MI)), BB->end());
exitMBB->transferSuccessorsAndUpdatePHIs(BB);
BB->addSuccessor(loop1MBB);
loop1MBB->addSuccessor(sinkMBB);
loop1MBB->addSuccessor(loop2MBB);
loop2MBB->addSuccessor(loop1MBB);
loop2MBB->addSuccessor(sinkMBB);
sinkMBB->addSuccessor(exitMBB);
// FIXME: computation of newval2 can be moved to loop2MBB.
// thisMBB:
// addiu masklsb2,$0,-4 # 0xfffffffc
// and alignedaddr,ptr,masklsb2
// andi ptrlsb2,ptr,3
// sll shiftamt,ptrlsb2,3
// ori maskupper,$0,255 # 0xff
// sll mask,maskupper,shiftamt
// nor mask2,$0,mask
// andi maskedcmpval,cmpval,255
// sll shiftedcmpval,maskedcmpval,shiftamt
// andi maskednewval,newval,255
// sll shiftednewval,maskednewval,shiftamt
int64_t MaskImm = (Size == 1) ? 255 : 65535;
BuildMI(BB, DL, TII->get(Mips::ADDiu), MaskLSB2)
.addReg(Mips::ZERO).addImm(-4);
BuildMI(BB, DL, TII->get(Mips::AND), AlignedAddr)
.addReg(Ptr).addReg(MaskLSB2);
BuildMI(BB, DL, TII->get(Mips::ANDi), PtrLSB2).addReg(Ptr).addImm(3);
if (Subtarget.isLittle()) {
BuildMI(BB, DL, TII->get(Mips::SLL), ShiftAmt).addReg(PtrLSB2).addImm(3);
} else {
unsigned Off = RegInfo.createVirtualRegister(RC);
BuildMI(BB, DL, TII->get(Mips::XORi), Off)
.addReg(PtrLSB2).addImm((Size == 1) ? 3 : 2);
BuildMI(BB, DL, TII->get(Mips::SLL), ShiftAmt).addReg(Off).addImm(3);
}
BuildMI(BB, DL, TII->get(Mips::ORi), MaskUpper)
.addReg(Mips::ZERO).addImm(MaskImm);
BuildMI(BB, DL, TII->get(Mips::SLLV), Mask)
.addReg(MaskUpper).addReg(ShiftAmt);
BuildMI(BB, DL, TII->get(Mips::NOR), Mask2).addReg(Mips::ZERO).addReg(Mask);
BuildMI(BB, DL, TII->get(Mips::ANDi), MaskedCmpVal)
.addReg(CmpVal).addImm(MaskImm);
BuildMI(BB, DL, TII->get(Mips::SLLV), ShiftedCmpVal)
.addReg(MaskedCmpVal).addReg(ShiftAmt);
BuildMI(BB, DL, TII->get(Mips::ANDi), MaskedNewVal)
.addReg(NewVal).addImm(MaskImm);
BuildMI(BB, DL, TII->get(Mips::SLLV), ShiftedNewVal)
.addReg(MaskedNewVal).addReg(ShiftAmt);
// loop1MBB:
// ll oldval,0(alginedaddr)
// and maskedoldval0,oldval,mask
// bne maskedoldval0,shiftedcmpval,sinkMBB
BB = loop1MBB;
unsigned LL = isMicroMips ? Mips::LL_MM : Mips::LL;
BuildMI(BB, DL, TII->get(LL), OldVal).addReg(AlignedAddr).addImm(0);
BuildMI(BB, DL, TII->get(Mips::AND), MaskedOldVal0)
.addReg(OldVal).addReg(Mask);
BuildMI(BB, DL, TII->get(Mips::BNE))
.addReg(MaskedOldVal0).addReg(ShiftedCmpVal).addMBB(sinkMBB);
// loop2MBB:
// and maskedoldval1,oldval,mask2
// or storeval,maskedoldval1,shiftednewval
// sc success,storeval,0(alignedaddr)
// beq success,$0,loop1MBB
BB = loop2MBB;
BuildMI(BB, DL, TII->get(Mips::AND), MaskedOldVal1)
.addReg(OldVal).addReg(Mask2);
BuildMI(BB, DL, TII->get(Mips::OR), StoreVal)
.addReg(MaskedOldVal1).addReg(ShiftedNewVal);
unsigned SC = isMicroMips ? Mips::SC_MM : Mips::SC;
BuildMI(BB, DL, TII->get(SC), Success)
.addReg(StoreVal).addReg(AlignedAddr).addImm(0);
BuildMI(BB, DL, TII->get(Mips::BEQ))
.addReg(Success).addReg(Mips::ZERO).addMBB(loop1MBB);
// sinkMBB:
// srl srlres,maskedoldval0,shiftamt
// sign_extend dest,srlres
BB = sinkMBB;
BuildMI(BB, DL, TII->get(Mips::SRLV), SrlRes)
.addReg(MaskedOldVal0).addReg(ShiftAmt);
BB = emitSignExtendToI32InReg(MI, BB, Size, Dest, SrlRes);
MI->eraseFromParent(); // The instruction is gone now.
return exitMBB;
}
MachineBasicBlock *MipsTargetLowering::emitSEL_D(MachineInstr *MI,
MachineBasicBlock *BB) const {
MachineFunction *MF = BB->getParent();
const TargetRegisterInfo *TRI =
getTargetMachine().getSubtargetImpl()->getRegisterInfo();
const TargetInstrInfo *TII =
getTargetMachine().getSubtargetImpl()->getInstrInfo();
MachineRegisterInfo &RegInfo = MF->getRegInfo();
DebugLoc DL = MI->getDebugLoc();
MachineBasicBlock::iterator II(MI);
unsigned Fc = MI->getOperand(1).getReg();
const auto &FGR64RegClass = TRI->getRegClass(Mips::FGR64RegClassID);
unsigned Fc2 = RegInfo.createVirtualRegister(FGR64RegClass);
BuildMI(*BB, II, DL, TII->get(Mips::SUBREG_TO_REG), Fc2)
.addImm(0)
.addReg(Fc)
.addImm(Mips::sub_lo);
// We don't erase the original instruction, we just replace the condition
// register with the 64-bit super-register.
MI->getOperand(1).setReg(Fc2);
return BB;
}
//===----------------------------------------------------------------------===//
// Misc Lower Operation implementation
//===----------------------------------------------------------------------===//
SDValue MipsTargetLowering::lowerBR_JT(SDValue Op, SelectionDAG &DAG) const {
SDValue Chain = Op.getOperand(0);
SDValue Table = Op.getOperand(1);
SDValue Index = Op.getOperand(2);
SDLoc DL(Op);
EVT PTy = getPointerTy();
unsigned EntrySize =
DAG.getMachineFunction().getJumpTableInfo()->getEntrySize(*getDataLayout());
Index = DAG.getNode(ISD::MUL, DL, PTy, Index,
DAG.getConstant(EntrySize, PTy));
SDValue Addr = DAG.getNode(ISD::ADD, DL, PTy, Index, Table);
EVT MemVT = EVT::getIntegerVT(*DAG.getContext(), EntrySize * 8);
Addr = DAG.getExtLoad(ISD::SEXTLOAD, DL, PTy, Chain, Addr,
MachinePointerInfo::getJumpTable(), MemVT, false, false,
false, 0);
Chain = Addr.getValue(1);
if ((getTargetMachine().getRelocationModel() == Reloc::PIC_) ||
Subtarget.isABI_N64()) {
// For PIC, the sequence is:
// BRIND(load(Jumptable + index) + RelocBase)
// RelocBase can be JumpTable, GOT or some sort of global base.
Addr = DAG.getNode(ISD::ADD, DL, PTy, Addr,
getPICJumpTableRelocBase(Table, DAG));
}
return DAG.getNode(ISD::BRIND, DL, MVT::Other, Chain, Addr);
}
SDValue MipsTargetLowering::lowerBRCOND(SDValue Op, SelectionDAG &DAG) const {
// The first operand is the chain, the second is the condition, the third is
// the block to branch to if the condition is true.
SDValue Chain = Op.getOperand(0);
SDValue Dest = Op.getOperand(2);
SDLoc DL(Op);
assert(!Subtarget.hasMips32r6() && !Subtarget.hasMips64r6());
SDValue CondRes = createFPCmp(DAG, Op.getOperand(1));
// Return if flag is not set by a floating point comparison.
if (CondRes.getOpcode() != MipsISD::FPCmp)
return Op;
SDValue CCNode = CondRes.getOperand(2);
Mips::CondCode CC =
(Mips::CondCode)cast<ConstantSDNode>(CCNode)->getZExtValue();
unsigned Opc = invertFPCondCodeUser(CC) ? Mips::BRANCH_F : Mips::BRANCH_T;
SDValue BrCode = DAG.getConstant(Opc, MVT::i32);
SDValue FCC0 = DAG.getRegister(Mips::FCC0, MVT::i32);
return DAG.getNode(MipsISD::FPBrcond, DL, Op.getValueType(), Chain, BrCode,
FCC0, Dest, CondRes);
}
SDValue MipsTargetLowering::
lowerSELECT(SDValue Op, SelectionDAG &DAG) const
{
assert(!Subtarget.hasMips32r6() && !Subtarget.hasMips64r6());
SDValue Cond = createFPCmp(DAG, Op.getOperand(0));
// Return if flag is not set by a floating point comparison.
if (Cond.getOpcode() != MipsISD::FPCmp)
return Op;
return createCMovFP(DAG, Cond, Op.getOperand(1), Op.getOperand(2),
SDLoc(Op));
}
SDValue MipsTargetLowering::
lowerSELECT_CC(SDValue Op, SelectionDAG &DAG) const
{
SDLoc DL(Op);
EVT Ty = Op.getOperand(0).getValueType();
SDValue Cond = DAG.getNode(ISD::SETCC, DL,
getSetCCResultType(*DAG.getContext(), Ty),
Op.getOperand(0), Op.getOperand(1),
Op.getOperand(4));
return DAG.getNode(ISD::SELECT, DL, Op.getValueType(), Cond, Op.getOperand(2),
Op.getOperand(3));
}
SDValue MipsTargetLowering::lowerSETCC(SDValue Op, SelectionDAG &DAG) const {
assert(!Subtarget.hasMips32r6() && !Subtarget.hasMips64r6());
SDValue Cond = createFPCmp(DAG, Op);
assert(Cond.getOpcode() == MipsISD::FPCmp &&
"Floating point operand expected.");
SDValue True = DAG.getConstant(1, MVT::i32);
SDValue False = DAG.getConstant(0, MVT::i32);
return createCMovFP(DAG, Cond, True, False, SDLoc(Op));
}
SDValue MipsTargetLowering::lowerGlobalAddress(SDValue Op,
SelectionDAG &DAG) const {
EVT Ty = Op.getValueType();
GlobalAddressSDNode *N = cast<GlobalAddressSDNode>(Op);
const GlobalValue *GV = N->getGlobal();
if (getTargetMachine().getRelocationModel() != Reloc::PIC_ &&
!Subtarget.isABI_N64()) {
const MipsTargetObjectFile &TLOF =
(const MipsTargetObjectFile&)getObjFileLowering();
if (TLOF.IsGlobalInSmallSection(GV, getTargetMachine()))
// %gp_rel relocation
return getAddrGPRel(N, SDLoc(N), Ty, DAG);
// %hi/%lo relocation
return getAddrNonPIC(N, SDLoc(N), Ty, DAG);
}
if (GV->hasInternalLinkage() || (GV->hasLocalLinkage() && !isa<Function>(GV)))
return getAddrLocal(N, SDLoc(N), Ty, DAG,
Subtarget.isABI_N32() || Subtarget.isABI_N64());
if (LargeGOT)
return getAddrGlobalLargeGOT(N, SDLoc(N), Ty, DAG, MipsII::MO_GOT_HI16,
MipsII::MO_GOT_LO16, DAG.getEntryNode(),
MachinePointerInfo::getGOT());
return getAddrGlobal(N, SDLoc(N), Ty, DAG,
(Subtarget.isABI_N32() || Subtarget.isABI_N64())
? MipsII::MO_GOT_DISP
: MipsII::MO_GOT16,
DAG.getEntryNode(), MachinePointerInfo::getGOT());
}
SDValue MipsTargetLowering::lowerBlockAddress(SDValue Op,
SelectionDAG &DAG) const {
BlockAddressSDNode *N = cast<BlockAddressSDNode>(Op);
EVT Ty = Op.getValueType();
if (getTargetMachine().getRelocationModel() != Reloc::PIC_ &&
!Subtarget.isABI_N64())
return getAddrNonPIC(N, SDLoc(N), Ty, DAG);
return getAddrLocal(N, SDLoc(N), Ty, DAG,
Subtarget.isABI_N32() || Subtarget.isABI_N64());
}
SDValue MipsTargetLowering::
lowerGlobalTLSAddress(SDValue Op, SelectionDAG &DAG) const
{
// If the relocation model is PIC, use the General Dynamic TLS Model or
// Local Dynamic TLS model, otherwise use the Initial Exec or
// Local Exec TLS Model.
GlobalAddressSDNode *GA = cast<GlobalAddressSDNode>(Op);
SDLoc DL(GA);
const GlobalValue *GV = GA->getGlobal();
EVT PtrVT = getPointerTy();
TLSModel::Model model = getTargetMachine().getTLSModel(GV);
if (model == TLSModel::GeneralDynamic || model == TLSModel::LocalDynamic) {
// General Dynamic and Local Dynamic TLS Model.
unsigned Flag = (model == TLSModel::LocalDynamic) ? MipsII::MO_TLSLDM
: MipsII::MO_TLSGD;
SDValue TGA = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0, Flag);
SDValue Argument = DAG.getNode(MipsISD::Wrapper, DL, PtrVT,
getGlobalReg(DAG, PtrVT), TGA);
unsigned PtrSize = PtrVT.getSizeInBits();
IntegerType *PtrTy = Type::getIntNTy(*DAG.getContext(), PtrSize);
SDValue TlsGetAddr = DAG.getExternalSymbol("__tls_get_addr", PtrVT);
ArgListTy Args;
ArgListEntry Entry;
Entry.Node = Argument;
Entry.Ty = PtrTy;
Args.push_back(Entry);
TargetLowering::CallLoweringInfo CLI(DAG);
CLI.setDebugLoc(DL).setChain(DAG.getEntryNode())
.setCallee(CallingConv::C, PtrTy, TlsGetAddr, std::move(Args), 0);
std::pair<SDValue, SDValue> CallResult = LowerCallTo(CLI);
SDValue Ret = CallResult.first;
if (model != TLSModel::LocalDynamic)
return Ret;
SDValue TGAHi = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0,
MipsII::MO_DTPREL_HI);
SDValue Hi = DAG.getNode(MipsISD::Hi, DL, PtrVT, TGAHi);
SDValue TGALo = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0,
MipsII::MO_DTPREL_LO);
SDValue Lo = DAG.getNode(MipsISD::Lo, DL, PtrVT, TGALo);
SDValue Add = DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Ret);
return DAG.getNode(ISD::ADD, DL, PtrVT, Add, Lo);
}
SDValue Offset;
if (model == TLSModel::InitialExec) {
// Initial Exec TLS Model
SDValue TGA = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0,
MipsII::MO_GOTTPREL);
TGA = DAG.getNode(MipsISD::Wrapper, DL, PtrVT, getGlobalReg(DAG, PtrVT),
TGA);
Offset = DAG.getLoad(PtrVT, DL,
DAG.getEntryNode(), TGA, MachinePointerInfo(),
false, false, false, 0);
} else {
// Local Exec TLS Model
assert(model == TLSModel::LocalExec);
SDValue TGAHi = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0,
MipsII::MO_TPREL_HI);
SDValue TGALo = DAG.getTargetGlobalAddress(GV, DL, PtrVT, 0,
MipsII::MO_TPREL_LO);
SDValue Hi = DAG.getNode(MipsISD::Hi, DL, PtrVT, TGAHi);
SDValue Lo = DAG.getNode(MipsISD::Lo, DL, PtrVT, TGALo);
Offset = DAG.getNode(ISD::ADD, DL, PtrVT, Hi, Lo);
}
SDValue ThreadPointer = DAG.getNode(MipsISD::ThreadPointer, DL, PtrVT);
return DAG.getNode(ISD::ADD, DL, PtrVT, ThreadPointer, Offset);
}
SDValue MipsTargetLowering::
lowerJumpTable(SDValue Op, SelectionDAG &DAG) const
{
JumpTableSDNode *N = cast<JumpTableSDNode>(Op);
EVT Ty = Op.getValueType();
if (getTargetMachine().getRelocationModel() != Reloc::PIC_ &&
!Subtarget.isABI_N64())
return getAddrNonPIC(N, SDLoc(N), Ty, DAG);
return getAddrLocal(N, SDLoc(N), Ty, DAG,
Subtarget.isABI_N32() || Subtarget.isABI_N64());
}
SDValue MipsTargetLowering::
lowerConstantPool(SDValue Op, SelectionDAG &DAG) const
{
ConstantPoolSDNode *N = cast<ConstantPoolSDNode>(Op);
EVT Ty = Op.getValueType();
if (getTargetMachine().getRelocationModel() != Reloc::PIC_ &&
!Subtarget.isABI_N64()) {
const MipsTargetObjectFile &TLOF =
(const MipsTargetObjectFile&)getObjFileLowering();
if (TLOF.IsConstantInSmallSection(N->getConstVal(), getTargetMachine()))
// %gp_rel relocation
return getAddrGPRel(N, SDLoc(N), Ty, DAG);
return getAddrNonPIC(N, SDLoc(N), Ty, DAG);
}
return getAddrLocal(N, SDLoc(N), Ty, DAG,
Subtarget.isABI_N32() || Subtarget.isABI_N64());
}
SDValue MipsTargetLowering::lowerVASTART(SDValue Op, SelectionDAG &DAG) const {
MachineFunction &MF = DAG.getMachineFunction();
MipsFunctionInfo *FuncInfo = MF.getInfo<MipsFunctionInfo>();
SDLoc DL(Op);
SDValue FI = DAG.getFrameIndex(FuncInfo->getVarArgsFrameIndex(),
getPointerTy());
// vastart just stores the address of the VarArgsFrameIndex slot into the
// memory location argument.
const Value *SV = cast<SrcValueSDNode>(Op.getOperand(2))->getValue();
return DAG.getStore(Op.getOperand(0), DL, FI, Op.getOperand(1),
MachinePointerInfo(SV), false, false, 0);
}
SDValue MipsTargetLowering::lowerVAARG(SDValue Op, SelectionDAG &DAG) const {
SDNode *Node = Op.getNode();
EVT VT = Node->getValueType(0);
SDValue Chain = Node->getOperand(0);
SDValue VAListPtr = Node->getOperand(1);
unsigned Align = Node->getConstantOperandVal(3);
const Value *SV = cast<SrcValueSDNode>(Node->getOperand(2))->getValue();
SDLoc DL(Node);
unsigned ArgSlotSizeInBytes =
(Subtarget.isABI_N32() || Subtarget.isABI_N64()) ? 8 : 4;
SDValue VAListLoad = DAG.getLoad(getPointerTy(), DL, Chain, VAListPtr,
MachinePointerInfo(SV), false, false, false,
0);
SDValue VAList = VAListLoad;
// Re-align the pointer if necessary.
// It should only ever be necessary for 64-bit types on O32 since the minimum
// argument alignment is the same as the maximum type alignment for N32/N64.
//
// FIXME: We currently align too often. The code generator doesn't notice
// when the pointer is still aligned from the last va_arg (or pair of
// va_args for the i64 on O32 case).
if (Align > getMinStackArgumentAlignment()) {
assert(((Align & (Align-1)) == 0) && "Expected Align to be a power of 2");
VAList = DAG.getNode(ISD::ADD, DL, VAList.getValueType(), VAList,
DAG.getConstant(Align - 1,
VAList.getValueType()));
VAList = DAG.getNode(ISD::AND, DL, VAList.getValueType(), VAList,
DAG.getConstant(-(int64_t)Align,
VAList.getValueType()));
}
// Increment the pointer, VAList, to the next vaarg.
unsigned ArgSizeInBytes = getDataLayout()->getTypeAllocSize(VT.getTypeForEVT(*DAG.getContext()));
SDValue Tmp3 = DAG.getNode(ISD::ADD, DL, VAList.getValueType(), VAList,
DAG.getConstant(RoundUpToAlignment(ArgSizeInBytes, ArgSlotSizeInBytes),
VAList.getValueType()));
// Store the incremented VAList to the legalized pointer
Chain = DAG.getStore(VAListLoad.getValue(1), DL, Tmp3, VAListPtr,
MachinePointerInfo(SV), false, false, 0);
// In big-endian mode we must adjust the pointer when the load size is smaller
// than the argument slot size. We must also reduce the known alignment to
// match. For example in the N64 ABI, we must add 4 bytes to the offset to get
// the correct half of the slot, and reduce the alignment from 8 (slot
// alignment) down to 4 (type alignment).
if (!Subtarget.isLittle() && ArgSizeInBytes < ArgSlotSizeInBytes) {
unsigned Adjustment = ArgSlotSizeInBytes - ArgSizeInBytes;
VAList = DAG.getNode(ISD::ADD, DL, VAListPtr.getValueType(), VAList,
DAG.getIntPtrConstant(Adjustment));
}
// Load the actual argument out of the pointer VAList
return DAG.getLoad(VT, DL, Chain, VAList, MachinePointerInfo(), false, false,
false, 0);
}
static SDValue lowerFCOPYSIGN32(SDValue Op, SelectionDAG &DAG,
bool HasExtractInsert) {
EVT TyX = Op.getOperand(0).getValueType();
EVT TyY = Op.getOperand(1).getValueType();
SDValue Const1 = DAG.getConstant(1, MVT::i32);
SDValue Const31 = DAG.getConstant(31, MVT::i32);
SDLoc DL(Op);
SDValue Res;
// If operand is of type f64, extract the upper 32-bit. Otherwise, bitcast it
// to i32.
SDValue X = (TyX == MVT::f32) ?
DAG.getNode(ISD::BITCAST, DL, MVT::i32, Op.getOperand(0)) :
DAG.getNode(MipsISD::ExtractElementF64, DL, MVT::i32, Op.getOperand(0),
Const1);
SDValue Y = (TyY == MVT::f32) ?
DAG.getNode(ISD::BITCAST, DL, MVT::i32, Op.getOperand(1)) :
DAG.getNode(MipsISD::ExtractElementF64, DL, MVT::i32, Op.getOperand(1),
Const1);
if (HasExtractInsert) {
// ext E, Y, 31, 1 ; extract bit31 of Y
// ins X, E, 31, 1 ; insert extracted bit at bit31 of X
SDValue E = DAG.getNode(MipsISD::Ext, DL, MVT::i32, Y, Const31, Const1);
Res = DAG.getNode(MipsISD::Ins, DL, MVT::i32, E, Const31, Const1, X);
} else {
// sll SllX, X, 1
// srl SrlX, SllX, 1
// srl SrlY, Y, 31
// sll SllY, SrlX, 31
// or Or, SrlX, SllY
SDValue SllX = DAG.getNode(ISD::SHL, DL, MVT::i32, X, Const1);
SDValue SrlX = DAG.getNode(ISD::SRL, DL, MVT::i32, SllX, Const1);
SDValue SrlY = DAG.getNode(ISD::SRL, DL, MVT::i32, Y, Const31);
SDValue SllY = DAG.getNode(ISD::SHL, DL, MVT::i32, SrlY, Const31);
Res = DAG.getNode(ISD::OR, DL, MVT::i32, SrlX, SllY);
}
if (TyX == MVT::f32)
return DAG.getNode(ISD::BITCAST, DL, Op.getOperand(0).getValueType(), Res);
SDValue LowX = DAG.getNode(MipsISD::ExtractElementF64, DL, MVT::i32,
Op.getOperand(0), DAG.getConstant(0, MVT::i32));
return DAG.getNode(MipsISD::BuildPairF64, DL, MVT::f64, LowX, Res);
}
static SDValue lowerFCOPYSIGN64(SDValue Op, SelectionDAG &DAG,
bool HasExtractInsert) {
unsigned WidthX = Op.getOperand(0).getValueSizeInBits();
unsigned WidthY = Op.getOperand(1).getValueSizeInBits();
EVT TyX = MVT::getIntegerVT(WidthX), TyY = MVT::getIntegerVT(WidthY);
SDValue Const1 = DAG.getConstant(1, MVT::i32);
SDLoc DL(Op);
// Bitcast to integer nodes.
SDValue X = DAG.getNode(ISD::BITCAST, DL, TyX, Op.getOperand(0));
SDValue Y = DAG.getNode(ISD::BITCAST, DL, TyY, Op.getOperand(1));
if (HasExtractInsert) {
// ext E, Y, width(Y) - 1, 1 ; extract bit width(Y)-1 of Y
// ins X, E, width(X) - 1, 1 ; insert extracted bit at bit width(X)-1 of X
SDValue E = DAG.getNode(MipsISD::Ext, DL, TyY, Y,
DAG.getConstant(WidthY - 1, MVT::i32), Const1);
if (WidthX > WidthY)
E = DAG.getNode(ISD::ZERO_EXTEND, DL, TyX, E);
else if (WidthY > WidthX)
E = DAG.getNode(ISD::TRUNCATE, DL, TyX, E);
SDValue I = DAG.getNode(MipsISD::Ins, DL, TyX, E,
DAG.getConstant(WidthX - 1, MVT::i32), Const1, X);
return DAG.getNode(ISD::BITCAST, DL, Op.getOperand(0).getValueType(), I);
}
// (d)sll SllX, X, 1
// (d)srl SrlX, SllX, 1
// (d)srl SrlY, Y, width(Y)-1
// (d)sll SllY, SrlX, width(Y)-1
// or Or, SrlX, SllY
SDValue SllX = DAG.getNode(ISD::SHL, DL, TyX, X, Const1);
SDValue SrlX = DAG.getNode(ISD::SRL, DL, TyX, SllX, Const1);
SDValue SrlY = DAG.getNode(ISD::SRL, DL, TyY, Y,
DAG.getConstant(WidthY - 1, MVT::i32));
if (WidthX > WidthY)
SrlY = DAG.getNode(ISD::ZERO_EXTEND, DL, TyX, SrlY);
else if (WidthY > WidthX)
SrlY = DAG.getNode(ISD::TRUNCATE, DL, TyX, SrlY);
SDValue SllY = DAG.getNode(ISD::SHL, DL, TyX, SrlY,
DAG.getConstant(WidthX - 1, MVT::i32));
SDValue Or = DAG.getNode(ISD::OR, DL, TyX, SrlX, SllY);
return DAG.getNode(ISD::BITCAST, DL, Op.getOperand(0).getValueType(), Or);
}
SDValue
MipsTargetLowering::lowerFCOPYSIGN(SDValue Op, SelectionDAG &DAG) const {
if (Subtarget.isGP64bit())
return lowerFCOPYSIGN64(Op, DAG, Subtarget.hasExtractInsert());
return lowerFCOPYSIGN32(Op, DAG, Subtarget.hasExtractInsert());
}
SDValue MipsTargetLowering::
lowerFRAMEADDR(SDValue Op, SelectionDAG &DAG) const {
// check the depth
assert((cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() == 0) &&
"Frame address can only be determined for current frame.");
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
MFI->setFrameAddressIsTaken(true);
EVT VT = Op.getValueType();
SDLoc DL(Op);
SDValue FrameAddr =
DAG.getCopyFromReg(DAG.getEntryNode(), DL,
Subtarget.isABI_N64() ? Mips::FP_64 : Mips::FP, VT);
return FrameAddr;
}
SDValue MipsTargetLowering::lowerRETURNADDR(SDValue Op,
SelectionDAG &DAG) const {
if (verifyReturnAddressArgumentIsConstant(Op, DAG))
return SDValue();
// check the depth
assert((cast<ConstantSDNode>(Op.getOperand(0))->getZExtValue() == 0) &&
"Return address can be determined only for current frame.");
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MVT VT = Op.getSimpleValueType();
unsigned RA = Subtarget.isABI_N64() ? Mips::RA_64 : Mips::RA;
MFI->setReturnAddressIsTaken(true);
// Return RA, which contains the return address. Mark it an implicit live-in.
unsigned Reg = MF.addLiveIn(RA, getRegClassFor(VT));
return DAG.getCopyFromReg(DAG.getEntryNode(), SDLoc(Op), Reg, VT);
}
// An EH_RETURN is the result of lowering llvm.eh.return which in turn is
// generated from __builtin_eh_return (offset, handler)
// The effect of this is to adjust the stack pointer by "offset"
// and then branch to "handler".
SDValue MipsTargetLowering::lowerEH_RETURN(SDValue Op, SelectionDAG &DAG)
const {
MachineFunction &MF = DAG.getMachineFunction();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
MipsFI->setCallsEhReturn();
SDValue Chain = Op.getOperand(0);
SDValue Offset = Op.getOperand(1);
SDValue Handler = Op.getOperand(2);
SDLoc DL(Op);
EVT Ty = Subtarget.isABI_N64() ? MVT::i64 : MVT::i32;
// Store stack offset in V1, store jump target in V0. Glue CopyToReg and
// EH_RETURN nodes, so that instructions are emitted back-to-back.
unsigned OffsetReg = Subtarget.isABI_N64() ? Mips::V1_64 : Mips::V1;
unsigned AddrReg = Subtarget.isABI_N64() ? Mips::V0_64 : Mips::V0;
Chain = DAG.getCopyToReg(Chain, DL, OffsetReg, Offset, SDValue());
Chain = DAG.getCopyToReg(Chain, DL, AddrReg, Handler, Chain.getValue(1));
return DAG.getNode(MipsISD::EH_RETURN, DL, MVT::Other, Chain,
DAG.getRegister(OffsetReg, Ty),
DAG.getRegister(AddrReg, getPointerTy()),
Chain.getValue(1));
}
SDValue MipsTargetLowering::lowerATOMIC_FENCE(SDValue Op,
SelectionDAG &DAG) const {
// FIXME: Need pseudo-fence for 'singlethread' fences
// FIXME: Set SType for weaker fences where supported/appropriate.
unsigned SType = 0;
SDLoc DL(Op);
return DAG.getNode(MipsISD::Sync, DL, MVT::Other, Op.getOperand(0),
DAG.getConstant(SType, MVT::i32));
}
SDValue MipsTargetLowering::lowerShiftLeftParts(SDValue Op,
SelectionDAG &DAG) const {
SDLoc DL(Op);
MVT VT = Subtarget.isGP64bit() ? MVT::i64 : MVT::i32;
SDValue Lo = Op.getOperand(0), Hi = Op.getOperand(1);
SDValue Shamt = Op.getOperand(2);
// if shamt < (VT.bits):
// lo = (shl lo, shamt)
// hi = (or (shl hi, shamt) (srl (srl lo, 1), ~shamt))
// else:
// lo = 0
// hi = (shl lo, shamt[4:0])
SDValue Not = DAG.getNode(ISD::XOR, DL, MVT::i32, Shamt,
DAG.getConstant(-1, MVT::i32));
SDValue ShiftRight1Lo = DAG.getNode(ISD::SRL, DL, VT, Lo,
DAG.getConstant(1, VT));
SDValue ShiftRightLo = DAG.getNode(ISD::SRL, DL, VT, ShiftRight1Lo, Not);
SDValue ShiftLeftHi = DAG.getNode(ISD::SHL, DL, VT, Hi, Shamt);
SDValue Or = DAG.getNode(ISD::OR, DL, VT, ShiftLeftHi, ShiftRightLo);
SDValue ShiftLeftLo = DAG.getNode(ISD::SHL, DL, VT, Lo, Shamt);
SDValue Cond = DAG.getNode(ISD::AND, DL, MVT::i32, Shamt,
DAG.getConstant(0x20, MVT::i32));
Lo = DAG.getNode(ISD::SELECT, DL, VT, Cond,
DAG.getConstant(0, VT), ShiftLeftLo);
Hi = DAG.getNode(ISD::SELECT, DL, VT, Cond, ShiftLeftLo, Or);
SDValue Ops[2] = {Lo, Hi};
return DAG.getMergeValues(Ops, DL);
}
SDValue MipsTargetLowering::lowerShiftRightParts(SDValue Op, SelectionDAG &DAG,
bool IsSRA) const {
SDLoc DL(Op);
SDValue Lo = Op.getOperand(0), Hi = Op.getOperand(1);
SDValue Shamt = Op.getOperand(2);
MVT VT = Subtarget.isGP64bit() ? MVT::i64 : MVT::i32;
// if shamt < (VT.bits):
// lo = (or (shl (shl hi, 1), ~shamt) (srl lo, shamt))
// if isSRA:
// hi = (sra hi, shamt)
// else:
// hi = (srl hi, shamt)
// else:
// if isSRA:
// lo = (sra hi, shamt[4:0])
// hi = (sra hi, 31)
// else:
// lo = (srl hi, shamt[4:0])
// hi = 0
SDValue Not = DAG.getNode(ISD::XOR, DL, MVT::i32, Shamt,
DAG.getConstant(-1, MVT::i32));
SDValue ShiftLeft1Hi = DAG.getNode(ISD::SHL, DL, VT, Hi,
DAG.getConstant(1, VT));
SDValue ShiftLeftHi = DAG.getNode(ISD::SHL, DL, VT, ShiftLeft1Hi, Not);
SDValue ShiftRightLo = DAG.getNode(ISD::SRL, DL, VT, Lo, Shamt);
SDValue Or = DAG.getNode(ISD::OR, DL, VT, ShiftLeftHi, ShiftRightLo);
SDValue ShiftRightHi = DAG.getNode(IsSRA ? ISD::SRA : ISD::SRL,
DL, VT, Hi, Shamt);
SDValue Cond = DAG.getNode(ISD::AND, DL, MVT::i32, Shamt,
DAG.getConstant(0x20, MVT::i32));
SDValue Shift31 = DAG.getNode(ISD::SRA, DL, VT, Hi, DAG.getConstant(31, VT));
Lo = DAG.getNode(ISD::SELECT, DL, VT, Cond, ShiftRightHi, Or);
Hi = DAG.getNode(ISD::SELECT, DL, VT, Cond,
IsSRA ? Shift31 : DAG.getConstant(0, VT), ShiftRightHi);
SDValue Ops[2] = {Lo, Hi};
return DAG.getMergeValues(Ops, DL);
}
static SDValue createLoadLR(unsigned Opc, SelectionDAG &DAG, LoadSDNode *LD,
SDValue Chain, SDValue Src, unsigned Offset) {
SDValue Ptr = LD->getBasePtr();
EVT VT = LD->getValueType(0), MemVT = LD->getMemoryVT();
EVT BasePtrVT = Ptr.getValueType();
SDLoc DL(LD);
SDVTList VTList = DAG.getVTList(VT, MVT::Other);
if (Offset)
Ptr = DAG.getNode(ISD::ADD, DL, BasePtrVT, Ptr,
DAG.getConstant(Offset, BasePtrVT));
SDValue Ops[] = { Chain, Ptr, Src };
return DAG.getMemIntrinsicNode(Opc, DL, VTList, Ops, MemVT,
LD->getMemOperand());
}
// Expand an unaligned 32 or 64-bit integer load node.
SDValue MipsTargetLowering::lowerLOAD(SDValue Op, SelectionDAG &DAG) const {
LoadSDNode *LD = cast<LoadSDNode>(Op);
EVT MemVT = LD->getMemoryVT();
if (Subtarget.systemSupportsUnalignedAccess())
return Op;
// Return if load is aligned or if MemVT is neither i32 nor i64.
if ((LD->getAlignment() >= MemVT.getSizeInBits() / 8) ||
((MemVT != MVT::i32) && (MemVT != MVT::i64)))
return SDValue();
bool IsLittle = Subtarget.isLittle();
EVT VT = Op.getValueType();
ISD::LoadExtType ExtType = LD->getExtensionType();
SDValue Chain = LD->getChain(), Undef = DAG.getUNDEF(VT);
assert((VT == MVT::i32) || (VT == MVT::i64));
// Expand
// (set dst, (i64 (load baseptr)))
// to
// (set tmp, (ldl (add baseptr, 7), undef))
// (set dst, (ldr baseptr, tmp))
if ((VT == MVT::i64) && (ExtType == ISD::NON_EXTLOAD)) {
SDValue LDL = createLoadLR(MipsISD::LDL, DAG, LD, Chain, Undef,
IsLittle ? 7 : 0);
return createLoadLR(MipsISD::LDR, DAG, LD, LDL.getValue(1), LDL,
IsLittle ? 0 : 7);
}
SDValue LWL = createLoadLR(MipsISD::LWL, DAG, LD, Chain, Undef,
IsLittle ? 3 : 0);
SDValue LWR = createLoadLR(MipsISD::LWR, DAG, LD, LWL.getValue(1), LWL,
IsLittle ? 0 : 3);
// Expand
// (set dst, (i32 (load baseptr))) or
// (set dst, (i64 (sextload baseptr))) or
// (set dst, (i64 (extload baseptr)))
// to
// (set tmp, (lwl (add baseptr, 3), undef))
// (set dst, (lwr baseptr, tmp))
if ((VT == MVT::i32) || (ExtType == ISD::SEXTLOAD) ||
(ExtType == ISD::EXTLOAD))
return LWR;
assert((VT == MVT::i64) && (ExtType == ISD::ZEXTLOAD));
// Expand
// (set dst, (i64 (zextload baseptr)))
// to
// (set tmp0, (lwl (add baseptr, 3), undef))
// (set tmp1, (lwr baseptr, tmp0))
// (set tmp2, (shl tmp1, 32))
// (set dst, (srl tmp2, 32))
SDLoc DL(LD);
SDValue Const32 = DAG.getConstant(32, MVT::i32);
SDValue SLL = DAG.getNode(ISD::SHL, DL, MVT::i64, LWR, Const32);
SDValue SRL = DAG.getNode(ISD::SRL, DL, MVT::i64, SLL, Const32);
SDValue Ops[] = { SRL, LWR.getValue(1) };
return DAG.getMergeValues(Ops, DL);
}
static SDValue createStoreLR(unsigned Opc, SelectionDAG &DAG, StoreSDNode *SD,
SDValue Chain, unsigned Offset) {
SDValue Ptr = SD->getBasePtr(), Value = SD->getValue();
EVT MemVT = SD->getMemoryVT(), BasePtrVT = Ptr.getValueType();
SDLoc DL(SD);
SDVTList VTList = DAG.getVTList(MVT::Other);
if (Offset)
Ptr = DAG.getNode(ISD::ADD, DL, BasePtrVT, Ptr,
DAG.getConstant(Offset, BasePtrVT));
SDValue Ops[] = { Chain, Value, Ptr };
return DAG.getMemIntrinsicNode(Opc, DL, VTList, Ops, MemVT,
SD->getMemOperand());
}
// Expand an unaligned 32 or 64-bit integer store node.
static SDValue lowerUnalignedIntStore(StoreSDNode *SD, SelectionDAG &DAG,
bool IsLittle) {
SDValue Value = SD->getValue(), Chain = SD->getChain();
EVT VT = Value.getValueType();
// Expand
// (store val, baseptr) or
// (truncstore val, baseptr)
// to
// (swl val, (add baseptr, 3))
// (swr val, baseptr)
if ((VT == MVT::i32) || SD->isTruncatingStore()) {
SDValue SWL = createStoreLR(MipsISD::SWL, DAG, SD, Chain,
IsLittle ? 3 : 0);
return createStoreLR(MipsISD::SWR, DAG, SD, SWL, IsLittle ? 0 : 3);
}
assert(VT == MVT::i64);
// Expand
// (store val, baseptr)
// to
// (sdl val, (add baseptr, 7))
// (sdr val, baseptr)
SDValue SDL = createStoreLR(MipsISD::SDL, DAG, SD, Chain, IsLittle ? 7 : 0);
return createStoreLR(MipsISD::SDR, DAG, SD, SDL, IsLittle ? 0 : 7);
}
// Lower (store (fp_to_sint $fp) $ptr) to (store (TruncIntFP $fp), $ptr).
static SDValue lowerFP_TO_SINT_STORE(StoreSDNode *SD, SelectionDAG &DAG) {
SDValue Val = SD->getValue();
if (Val.getOpcode() != ISD::FP_TO_SINT)
return SDValue();
EVT FPTy = EVT::getFloatingPointVT(Val.getValueSizeInBits());
SDValue Tr = DAG.getNode(MipsISD::TruncIntFP, SDLoc(Val), FPTy,
Val.getOperand(0));
return DAG.getStore(SD->getChain(), SDLoc(SD), Tr, SD->getBasePtr(),
SD->getPointerInfo(), SD->isVolatile(),
SD->isNonTemporal(), SD->getAlignment());
}
SDValue MipsTargetLowering::lowerSTORE(SDValue Op, SelectionDAG &DAG) const {
StoreSDNode *SD = cast<StoreSDNode>(Op);
EVT MemVT = SD->getMemoryVT();
// Lower unaligned integer stores.
if (!Subtarget.systemSupportsUnalignedAccess() &&
(SD->getAlignment() < MemVT.getSizeInBits() / 8) &&
((MemVT == MVT::i32) || (MemVT == MVT::i64)))
return lowerUnalignedIntStore(SD, DAG, Subtarget.isLittle());
return lowerFP_TO_SINT_STORE(SD, DAG);
}
SDValue MipsTargetLowering::lowerADD(SDValue Op, SelectionDAG &DAG) const {
if (Op->getOperand(0).getOpcode() != ISD::FRAMEADDR
|| cast<ConstantSDNode>
(Op->getOperand(0).getOperand(0))->getZExtValue() != 0
|| Op->getOperand(1).getOpcode() != ISD::FRAME_TO_ARGS_OFFSET)
return SDValue();
// The pattern
// (add (frameaddr 0), (frame_to_args_offset))
// results from lowering llvm.eh.dwarf.cfa intrinsic. Transform it to
// (add FrameObject, 0)
// where FrameObject is a fixed StackObject with offset 0 which points to
// the old stack pointer.
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
EVT ValTy = Op->getValueType(0);
int FI = MFI->CreateFixedObject(Op.getValueSizeInBits() / 8, 0, false);
SDValue InArgsAddr = DAG.getFrameIndex(FI, ValTy);
return DAG.getNode(ISD::ADD, SDLoc(Op), ValTy, InArgsAddr,
DAG.getConstant(0, ValTy));
}
SDValue MipsTargetLowering::lowerFP_TO_SINT(SDValue Op,
SelectionDAG &DAG) const {
EVT FPTy = EVT::getFloatingPointVT(Op.getValueSizeInBits());
SDValue Trunc = DAG.getNode(MipsISD::TruncIntFP, SDLoc(Op), FPTy,
Op.getOperand(0));
return DAG.getNode(ISD::BITCAST, SDLoc(Op), Op.getValueType(), Trunc);
}
//===----------------------------------------------------------------------===//
// Calling Convention Implementation
//===----------------------------------------------------------------------===//
//===----------------------------------------------------------------------===//
// TODO: Implement a generic logic using tblgen that can support this.
// Mips O32 ABI rules:
// ---
// i32 - Passed in A0, A1, A2, A3 and stack
// f32 - Only passed in f32 registers if no int reg has been used yet to hold
// an argument. Otherwise, passed in A1, A2, A3 and stack.
// f64 - Only passed in two aliased f32 registers if no int reg has been used
// yet to hold an argument. Otherwise, use A2, A3 and stack. If A1 is
// not used, it must be shadowed. If only A3 is available, shadow it and
// go to stack.
//
// For vararg functions, all arguments are passed in A0, A1, A2, A3 and stack.
//===----------------------------------------------------------------------===//
static bool CC_MipsO32(unsigned ValNo, MVT ValVT, MVT LocVT,
CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags,
CCState &State, const MCPhysReg *F64Regs) {
const MipsSubtarget &Subtarget =
State.getMachineFunction().getTarget()
.getSubtarget<const MipsSubtarget>();
static const unsigned IntRegsSize = 4, FloatRegsSize = 2;
static const MCPhysReg IntRegs[] = { Mips::A0, Mips::A1, Mips::A2, Mips::A3 };
static const MCPhysReg F32Regs[] = { Mips::F12, Mips::F14 };
// Do not process byval args here.
if (ArgFlags.isByVal())
return true;
// Promote i8 and i16
if (ArgFlags.isInReg() && !Subtarget.isLittle()) {
if (LocVT == MVT::i8 || LocVT == MVT::i16 || LocVT == MVT::i32) {
LocVT = MVT::i32;
if (ArgFlags.isSExt())
LocInfo = CCValAssign::SExtUpper;
else if (ArgFlags.isZExt())
LocInfo = CCValAssign::ZExtUpper;
else
LocInfo = CCValAssign::AExtUpper;
}
}
// Promote i8 and i16
if (LocVT == MVT::i8 || LocVT == MVT::i16) {
LocVT = MVT::i32;
if (ArgFlags.isSExt())
LocInfo = CCValAssign::SExt;
else if (ArgFlags.isZExt())
LocInfo = CCValAssign::ZExt;
else
LocInfo = CCValAssign::AExt;
}
unsigned Reg;
// f32 and f64 are allocated in A0, A1, A2, A3 when either of the following
// is true: function is vararg, argument is 3rd or higher, there is previous
// argument which is not f32 or f64.
bool AllocateFloatsInIntReg = State.isVarArg() || ValNo > 1
|| State.getFirstUnallocated(F32Regs, FloatRegsSize) != ValNo;
unsigned OrigAlign = ArgFlags.getOrigAlign();
bool isI64 = (ValVT == MVT::i32 && OrigAlign == 8);
if (ValVT == MVT::i32 || (ValVT == MVT::f32 && AllocateFloatsInIntReg)) {
Reg = State.AllocateReg(IntRegs, IntRegsSize);
// If this is the first part of an i64 arg,
// the allocated register must be either A0 or A2.
if (isI64 && (Reg == Mips::A1 || Reg == Mips::A3))
Reg = State.AllocateReg(IntRegs, IntRegsSize);
LocVT = MVT::i32;
} else if (ValVT == MVT::f64 && AllocateFloatsInIntReg) {
// Allocate int register and shadow next int register. If first
// available register is Mips::A1 or Mips::A3, shadow it too.
Reg = State.AllocateReg(IntRegs, IntRegsSize);
if (Reg == Mips::A1 || Reg == Mips::A3)
Reg = State.AllocateReg(IntRegs, IntRegsSize);
State.AllocateReg(IntRegs, IntRegsSize);
LocVT = MVT::i32;
} else if (ValVT.isFloatingPoint() && !AllocateFloatsInIntReg) {
// we are guaranteed to find an available float register
if (ValVT == MVT::f32) {
Reg = State.AllocateReg(F32Regs, FloatRegsSize);
// Shadow int register
State.AllocateReg(IntRegs, IntRegsSize);
} else {
Reg = State.AllocateReg(F64Regs, FloatRegsSize);
// Shadow int registers
unsigned Reg2 = State.AllocateReg(IntRegs, IntRegsSize);
if (Reg2 == Mips::A1 || Reg2 == Mips::A3)
State.AllocateReg(IntRegs, IntRegsSize);
State.AllocateReg(IntRegs, IntRegsSize);
}
} else
llvm_unreachable("Cannot handle this ValVT.");
if (!Reg) {
unsigned Offset = State.AllocateStack(ValVT.getSizeInBits() >> 3,
OrigAlign);
State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset, LocVT, LocInfo));
} else
State.addLoc(CCValAssign::getReg(ValNo, ValVT, Reg, LocVT, LocInfo));
return false;
}
static bool CC_MipsO32_FP32(unsigned ValNo, MVT ValVT,
MVT LocVT, CCValAssign::LocInfo LocInfo,
ISD::ArgFlagsTy ArgFlags, CCState &State) {
static const MCPhysReg F64Regs[] = { Mips::D6, Mips::D7 };
return CC_MipsO32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State, F64Regs);
}
static bool CC_MipsO32_FP64(unsigned ValNo, MVT ValVT,
MVT LocVT, CCValAssign::LocInfo LocInfo,
ISD::ArgFlagsTy ArgFlags, CCState &State) {
static const MCPhysReg F64Regs[] = { Mips::D12_64, Mips::D14_64 };
return CC_MipsO32(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State, F64Regs);
}
static bool CC_MipsO32(unsigned ValNo, MVT ValVT, MVT LocVT,
CCValAssign::LocInfo LocInfo, ISD::ArgFlagsTy ArgFlags,
CCState &State) LLVM_ATTRIBUTE_UNUSED;
#include "MipsGenCallingConv.inc"
//===----------------------------------------------------------------------===//
// Call Calling Convention Implementation
//===----------------------------------------------------------------------===//
// Return next O32 integer argument register.
static unsigned getNextIntArgReg(unsigned Reg) {
assert((Reg == Mips::A0) || (Reg == Mips::A2));
return (Reg == Mips::A0) ? Mips::A1 : Mips::A3;
}
SDValue
MipsTargetLowering::passArgOnStack(SDValue StackPtr, unsigned Offset,
SDValue Chain, SDValue Arg, SDLoc DL,
bool IsTailCall, SelectionDAG &DAG) const {
if (!IsTailCall) {
SDValue PtrOff = DAG.getNode(ISD::ADD, DL, getPointerTy(), StackPtr,
DAG.getIntPtrConstant(Offset));
return DAG.getStore(Chain, DL, Arg, PtrOff, MachinePointerInfo(), false,
false, 0);
}
MachineFrameInfo *MFI = DAG.getMachineFunction().getFrameInfo();
int FI = MFI->CreateFixedObject(Arg.getValueSizeInBits() / 8, Offset, false);
SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
return DAG.getStore(Chain, DL, Arg, FIN, MachinePointerInfo(),
/*isVolatile=*/ true, false, 0);
}
void MipsTargetLowering::
getOpndList(SmallVectorImpl<SDValue> &Ops,
std::deque< std::pair<unsigned, SDValue> > &RegsToPass,
bool IsPICCall, bool GlobalOrExternal, bool InternalLinkage,
bool IsCallReloc, CallLoweringInfo &CLI, SDValue Callee,
SDValue Chain) const {
// Insert node "GP copy globalreg" before call to function.
//
// R_MIPS_CALL* operators (emitted when non-internal functions are called
// in PIC mode) allow symbols to be resolved via lazy binding.
// The lazy binding stub requires GP to point to the GOT.
// Note that we don't need GP to point to the GOT for indirect calls
// (when R_MIPS_CALL* is not used for the call) because Mips linker generates
// lazy binding stub for a function only when R_MIPS_CALL* are the only relocs
// used for the function (that is, Mips linker doesn't generate lazy binding
// stub for a function whose address is taken in the program).
if (IsPICCall && !InternalLinkage && IsCallReloc) {
unsigned GPReg = Subtarget.isABI_N64() ? Mips::GP_64 : Mips::GP;
EVT Ty = Subtarget.isABI_N64() ? MVT::i64 : MVT::i32;
RegsToPass.push_back(std::make_pair(GPReg, getGlobalReg(CLI.DAG, Ty)));
}
// Build a sequence of copy-to-reg nodes chained together with token
// chain and flag operands which copy the outgoing args into registers.
// The InFlag in necessary since all emitted instructions must be
// stuck together.
SDValue InFlag;
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i) {
Chain = CLI.DAG.getCopyToReg(Chain, CLI.DL, RegsToPass[i].first,
RegsToPass[i].second, InFlag);
InFlag = Chain.getValue(1);
}
// Add argument registers to the end of the list so that they are
// known live into the call.
for (unsigned i = 0, e = RegsToPass.size(); i != e; ++i)
Ops.push_back(CLI.DAG.getRegister(RegsToPass[i].first,
RegsToPass[i].second.getValueType()));
// Add a register mask operand representing the call-preserved registers.
const TargetRegisterInfo *TRI =
getTargetMachine().getSubtargetImpl()->getRegisterInfo();
const uint32_t *Mask = TRI->getCallPreservedMask(CLI.CallConv);
assert(Mask && "Missing call preserved mask for calling convention");
if (Subtarget.inMips16HardFloat()) {
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(CLI.Callee)) {
llvm::StringRef Sym = G->getGlobal()->getName();
Function *F = G->getGlobal()->getParent()->getFunction(Sym);
if (F && F->hasFnAttribute("__Mips16RetHelper")) {
Mask = MipsRegisterInfo::getMips16RetHelperMask();
}
}
}
Ops.push_back(CLI.DAG.getRegisterMask(Mask));
if (InFlag.getNode())
Ops.push_back(InFlag);
}
/// LowerCall - functions arguments are copied from virtual regs to
/// (physical regs)/(stack frame), CALLSEQ_START and CALLSEQ_END are emitted.
SDValue
MipsTargetLowering::LowerCall(TargetLowering::CallLoweringInfo &CLI,
SmallVectorImpl<SDValue> &InVals) const {
SelectionDAG &DAG = CLI.DAG;
SDLoc DL = CLI.DL;
SmallVectorImpl<ISD::OutputArg> &Outs = CLI.Outs;
SmallVectorImpl<SDValue> &OutVals = CLI.OutVals;
SmallVectorImpl<ISD::InputArg> &Ins = CLI.Ins;
SDValue Chain = CLI.Chain;
SDValue Callee = CLI.Callee;
bool &IsTailCall = CLI.IsTailCall;
CallingConv::ID CallConv = CLI.CallConv;
bool IsVarArg = CLI.IsVarArg;
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
const TargetFrameLowering *TFL = MF.getSubtarget().getFrameLowering();
MipsFunctionInfo *FuncInfo = MF.getInfo<MipsFunctionInfo>();
bool IsPIC = getTargetMachine().getRelocationModel() == Reloc::PIC_;
// Analyze operands of the call, assigning locations to each operand.
SmallVector<CCValAssign, 16> ArgLocs;
MipsCCState CCInfo(
CallConv, IsVarArg, DAG.getMachineFunction(), ArgLocs, *DAG.getContext(),
MipsCCState::getSpecialCallingConvForCallee(Callee.getNode(), Subtarget));
// Allocate the reserved argument area. It seems strange to do this from the
// caller side but removing it breaks the frame size calculation.
const MipsABIInfo &ABI =
static_cast<const MipsTargetMachine &>(MF.getTarget()).getABI();
CCInfo.AllocateStack(ABI.GetCalleeAllocdArgSizeInBytes(CallConv), 1);
CCInfo.AnalyzeCallOperands(Outs, CC_Mips, CLI.getArgs(), Callee.getNode());
// Get a count of how many bytes are to be pushed on the stack.
unsigned NextStackOffset = CCInfo.getNextStackOffset();
// Check if it's really possible to do a tail call.
if (IsTailCall)
IsTailCall = isEligibleForTailCallOptimization(
CCInfo, NextStackOffset, *MF.getInfo<MipsFunctionInfo>());
if (!IsTailCall && CLI.CS && CLI.CS->isMustTailCall())
report_fatal_error("failed to perform tail call elimination on a call "
"site marked musttail");
if (IsTailCall)
++NumTailCalls;
// Chain is the output chain of the last Load/Store or CopyToReg node.
// ByValChain is the output chain of the last Memcpy node created for copying
// byval arguments to the stack.
unsigned StackAlignment = TFL->getStackAlignment();
NextStackOffset = RoundUpToAlignment(NextStackOffset, StackAlignment);
SDValue NextStackOffsetVal = DAG.getIntPtrConstant(NextStackOffset, true);
if (!IsTailCall)
Chain = DAG.getCALLSEQ_START(Chain, NextStackOffsetVal, DL);
SDValue StackPtr = DAG.getCopyFromReg(
Chain, DL, Subtarget.isABI_N64() ? Mips::SP_64 : Mips::SP,
getPointerTy());
// With EABI is it possible to have 16 args on registers.
std::deque< std::pair<unsigned, SDValue> > RegsToPass;
SmallVector<SDValue, 8> MemOpChains;
CCInfo.rewindByValRegsInfo();
// Walk the register/memloc assignments, inserting copies/loads.
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
SDValue Arg = OutVals[i];
CCValAssign &VA = ArgLocs[i];
MVT ValVT = VA.getValVT(), LocVT = VA.getLocVT();
ISD::ArgFlagsTy Flags = Outs[i].Flags;
bool UseUpperBits = false;
// ByVal Arg.
if (Flags.isByVal()) {
unsigned FirstByValReg, LastByValReg;
unsigned ByValIdx = CCInfo.getInRegsParamsProcessed();
CCInfo.getInRegsParamInfo(ByValIdx, FirstByValReg, LastByValReg);
assert(Flags.getByValSize() &&
"ByVal args of size 0 should have been ignored by front-end.");
assert(ByValIdx < CCInfo.getInRegsParamsCount());
assert(!IsTailCall &&
"Do not tail-call optimize if there is a byval argument.");
passByValArg(Chain, DL, RegsToPass, MemOpChains, StackPtr, MFI, DAG, Arg,
FirstByValReg, LastByValReg, Flags, Subtarget.isLittle(),
VA);
CCInfo.nextInRegsParam();
continue;
}
// Promote the value if needed.
switch (VA.getLocInfo()) {
default:
llvm_unreachable("Unknown loc info!");
case CCValAssign::Full:
if (VA.isRegLoc()) {
if ((ValVT == MVT::f32 && LocVT == MVT::i32) ||
(ValVT == MVT::f64 && LocVT == MVT::i64) ||
(ValVT == MVT::i64 && LocVT == MVT::f64))
Arg = DAG.getNode(ISD::BITCAST, DL, LocVT, Arg);
else if (ValVT == MVT::f64 && LocVT == MVT::i32) {
SDValue Lo = DAG.getNode(MipsISD::ExtractElementF64, DL, MVT::i32,
Arg, DAG.getConstant(0, MVT::i32));
SDValue Hi = DAG.getNode(MipsISD::ExtractElementF64, DL, MVT::i32,
Arg, DAG.getConstant(1, MVT::i32));
if (!Subtarget.isLittle())
std::swap(Lo, Hi);
unsigned LocRegLo = VA.getLocReg();
unsigned LocRegHigh = getNextIntArgReg(LocRegLo);
RegsToPass.push_back(std::make_pair(LocRegLo, Lo));
RegsToPass.push_back(std::make_pair(LocRegHigh, Hi));
continue;
}
}
break;
case CCValAssign::BCvt:
Arg = DAG.getNode(ISD::BITCAST, DL, LocVT, Arg);
break;
case CCValAssign::SExtUpper:
UseUpperBits = true;
// Fallthrough
case CCValAssign::SExt:
Arg = DAG.getNode(ISD::SIGN_EXTEND, DL, LocVT, Arg);
break;
case CCValAssign::ZExtUpper:
UseUpperBits = true;
// Fallthrough
case CCValAssign::ZExt:
Arg = DAG.getNode(ISD::ZERO_EXTEND, DL, LocVT, Arg);
break;
case CCValAssign::AExtUpper:
UseUpperBits = true;
// Fallthrough
case CCValAssign::AExt:
Arg = DAG.getNode(ISD::ANY_EXTEND, DL, LocVT, Arg);
break;
}
if (UseUpperBits) {
unsigned ValSizeInBits = Outs[i].ArgVT.getSizeInBits();
unsigned LocSizeInBits = VA.getLocVT().getSizeInBits();
Arg = DAG.getNode(
ISD::SHL, DL, VA.getLocVT(), Arg,
DAG.getConstant(LocSizeInBits - ValSizeInBits, VA.getLocVT()));
}
// Arguments that can be passed on register must be kept at
// RegsToPass vector
if (VA.isRegLoc()) {
RegsToPass.push_back(std::make_pair(VA.getLocReg(), Arg));
continue;
}
// Register can't get to this point...
assert(VA.isMemLoc());
// emit ISD::STORE whichs stores the
// parameter value to a stack Location
MemOpChains.push_back(passArgOnStack(StackPtr, VA.getLocMemOffset(),
Chain, Arg, DL, IsTailCall, DAG));
}
// Transform all store nodes into one single node because all store
// nodes are independent of each other.
if (!MemOpChains.empty())
Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, MemOpChains);
// If the callee is a GlobalAddress/ExternalSymbol node (quite common, every
// direct call is) turn it into a TargetGlobalAddress/TargetExternalSymbol
// node so that legalize doesn't hack it.
bool IsPICCall =
(Subtarget.isABI_N64() || IsPIC); // true if calls are translated to
// jalr $25
bool GlobalOrExternal = false, InternalLinkage = false, IsCallReloc = false;
SDValue CalleeLo;
EVT Ty = Callee.getValueType();
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee)) {
if (IsPICCall) {
const GlobalValue *Val = G->getGlobal();
InternalLinkage = Val->hasInternalLinkage();
if (InternalLinkage)
Callee = getAddrLocal(G, DL, Ty, DAG,
Subtarget.isABI_N32() || Subtarget.isABI_N64());
else if (LargeGOT) {
Callee = getAddrGlobalLargeGOT(G, DL, Ty, DAG, MipsII::MO_CALL_HI16,
MipsII::MO_CALL_LO16, Chain,
FuncInfo->callPtrInfo(Val));
IsCallReloc = true;
} else {
Callee = getAddrGlobal(G, DL, Ty, DAG, MipsII::MO_GOT_CALL, Chain,
FuncInfo->callPtrInfo(Val));
IsCallReloc = true;
}
} else
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), DL, getPointerTy(), 0,
MipsII::MO_NO_FLAG);
GlobalOrExternal = true;
}
else if (ExternalSymbolSDNode *S = dyn_cast<ExternalSymbolSDNode>(Callee)) {
const char *Sym = S->getSymbol();
if (!Subtarget.isABI_N64() && !IsPIC) // !N64 && static
Callee =
DAG.getTargetExternalSymbol(Sym, getPointerTy(), MipsII::MO_NO_FLAG);
else if (LargeGOT) {
Callee = getAddrGlobalLargeGOT(S, DL, Ty, DAG, MipsII::MO_CALL_HI16,
MipsII::MO_CALL_LO16, Chain,
FuncInfo->callPtrInfo(Sym));
IsCallReloc = true;
} else { // N64 || PIC
Callee = getAddrGlobal(S, DL, Ty, DAG, MipsII::MO_GOT_CALL, Chain,
FuncInfo->callPtrInfo(Sym));
IsCallReloc = true;
}
GlobalOrExternal = true;
}
SmallVector<SDValue, 8> Ops(1, Chain);
SDVTList NodeTys = DAG.getVTList(MVT::Other, MVT::Glue);
getOpndList(Ops, RegsToPass, IsPICCall, GlobalOrExternal, InternalLinkage,
IsCallReloc, CLI, Callee, Chain);
if (IsTailCall)
return DAG.getNode(MipsISD::TailCall, DL, MVT::Other, Ops);
Chain = DAG.getNode(MipsISD::JmpLink, DL, NodeTys, Ops);
SDValue InFlag = Chain.getValue(1);
// Create the CALLSEQ_END node.
Chain = DAG.getCALLSEQ_END(Chain, NextStackOffsetVal,
DAG.getIntPtrConstant(0, true), InFlag, DL);
InFlag = Chain.getValue(1);
// Handle result values, copying them out of physregs into vregs that we
// return.
return LowerCallResult(Chain, InFlag, CallConv, IsVarArg, Ins, DL, DAG,
InVals, CLI);
}
/// LowerCallResult - Lower the result values of a call into the
/// appropriate copies out of appropriate physical registers.
SDValue MipsTargetLowering::LowerCallResult(
SDValue Chain, SDValue InFlag, CallingConv::ID CallConv, bool IsVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins, SDLoc DL, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals,
TargetLowering::CallLoweringInfo &CLI) const {
// Assign locations to each value returned by this call.
SmallVector<CCValAssign, 16> RVLocs;
MipsCCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(), RVLocs,
*DAG.getContext());
CCInfo.AnalyzeCallResult(Ins, RetCC_Mips, CLI);
// Copy all of the result registers out of their specified physreg.
for (unsigned i = 0; i != RVLocs.size(); ++i) {
CCValAssign &VA = RVLocs[i];
assert(VA.isRegLoc() && "Can only return in registers!");
SDValue Val = DAG.getCopyFromReg(Chain, DL, RVLocs[i].getLocReg(),
RVLocs[i].getLocVT(), InFlag);
Chain = Val.getValue(1);
InFlag = Val.getValue(2);
if (VA.isUpperBitsInLoc()) {
unsigned ValSizeInBits = Ins[i].ArgVT.getSizeInBits();
unsigned LocSizeInBits = VA.getLocVT().getSizeInBits();
unsigned Shift =
VA.getLocInfo() == CCValAssign::ZExtUpper ? ISD::SRL : ISD::SRA;
Val = DAG.getNode(
Shift, DL, VA.getLocVT(), Val,
DAG.getConstant(LocSizeInBits - ValSizeInBits, VA.getLocVT()));
}
switch (VA.getLocInfo()) {
default:
llvm_unreachable("Unknown loc info!");
case CCValAssign::Full:
break;
case CCValAssign::BCvt:
Val = DAG.getNode(ISD::BITCAST, DL, VA.getValVT(), Val);
break;
case CCValAssign::AExt:
case CCValAssign::AExtUpper:
Val = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Val);
break;
case CCValAssign::ZExt:
case CCValAssign::ZExtUpper:
Val = DAG.getNode(ISD::AssertZext, DL, VA.getLocVT(), Val,
DAG.getValueType(VA.getValVT()));
Val = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Val);
break;
case CCValAssign::SExt:
case CCValAssign::SExtUpper:
Val = DAG.getNode(ISD::AssertSext, DL, VA.getLocVT(), Val,
DAG.getValueType(VA.getValVT()));
Val = DAG.getNode(ISD::TRUNCATE, DL, VA.getValVT(), Val);
break;
}
InVals.push_back(Val);
}
return Chain;
}
static SDValue UnpackFromArgumentSlot(SDValue Val, const CCValAssign &VA,
EVT ArgVT, SDLoc DL, SelectionDAG &DAG) {
MVT LocVT = VA.getLocVT();
EVT ValVT = VA.getValVT();
// Shift into the upper bits if necessary.
switch (VA.getLocInfo()) {
default:
break;
case CCValAssign::AExtUpper:
case CCValAssign::SExtUpper:
case CCValAssign::ZExtUpper: {
unsigned ValSizeInBits = ArgVT.getSizeInBits();
unsigned LocSizeInBits = VA.getLocVT().getSizeInBits();
unsigned Opcode =
VA.getLocInfo() == CCValAssign::ZExtUpper ? ISD::SRL : ISD::SRA;
Val = DAG.getNode(
Opcode, DL, VA.getLocVT(), Val,
DAG.getConstant(LocSizeInBits - ValSizeInBits, VA.getLocVT()));
break;
}
}
// If this is an value smaller than the argument slot size (32-bit for O32,
// 64-bit for N32/N64), it has been promoted in some way to the argument slot
// size. Extract the value and insert any appropriate assertions regarding
// sign/zero extension.
switch (VA.getLocInfo()) {
default:
llvm_unreachable("Unknown loc info!");
case CCValAssign::Full:
break;
case CCValAssign::AExtUpper:
case CCValAssign::AExt:
Val = DAG.getNode(ISD::TRUNCATE, DL, ValVT, Val);
break;
case CCValAssign::SExtUpper:
case CCValAssign::SExt:
Val = DAG.getNode(ISD::AssertSext, DL, LocVT, Val, DAG.getValueType(ValVT));
Val = DAG.getNode(ISD::TRUNCATE, DL, ValVT, Val);
break;
case CCValAssign::ZExtUpper:
case CCValAssign::ZExt:
Val = DAG.getNode(ISD::AssertZext, DL, LocVT, Val, DAG.getValueType(ValVT));
Val = DAG.getNode(ISD::TRUNCATE, DL, ValVT, Val);
break;
case CCValAssign::BCvt:
Val = DAG.getNode(ISD::BITCAST, DL, ValVT, Val);
break;
}
return Val;
}
//===----------------------------------------------------------------------===//
// Formal Arguments Calling Convention Implementation
//===----------------------------------------------------------------------===//
/// LowerFormalArguments - transform physical registers into virtual registers
/// and generate load operations for arguments places on the stack.
SDValue
MipsTargetLowering::LowerFormalArguments(SDValue Chain,
CallingConv::ID CallConv,
bool IsVarArg,
const SmallVectorImpl<ISD::InputArg> &Ins,
SDLoc DL, SelectionDAG &DAG,
SmallVectorImpl<SDValue> &InVals)
const {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
MipsFI->setVarArgsFrameIndex(0);
// Used with vargs to acumulate store chains.
std::vector<SDValue> OutChains;
// Assign locations to all of the incoming arguments.
SmallVector<CCValAssign, 16> ArgLocs;
MipsCCState CCInfo(CallConv, IsVarArg, DAG.getMachineFunction(), ArgLocs,
*DAG.getContext());
const MipsABIInfo &ABI =
static_cast<const MipsTargetMachine &>(MF.getTarget()).getABI();
CCInfo.AllocateStack(ABI.GetCalleeAllocdArgSizeInBytes(CallConv), 1);
Function::const_arg_iterator FuncArg =
DAG.getMachineFunction().getFunction()->arg_begin();
CCInfo.AnalyzeFormalArguments(Ins, CC_Mips_FixedArg);
MipsFI->setFormalArgInfo(CCInfo.getNextStackOffset(),
CCInfo.getInRegsParamsCount() > 0);
unsigned CurArgIdx = 0;
CCInfo.rewindByValRegsInfo();
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
CCValAssign &VA = ArgLocs[i];
std::advance(FuncArg, Ins[i].OrigArgIndex - CurArgIdx);
CurArgIdx = Ins[i].OrigArgIndex;
EVT ValVT = VA.getValVT();
ISD::ArgFlagsTy Flags = Ins[i].Flags;
bool IsRegLoc = VA.isRegLoc();
if (Flags.isByVal()) {
unsigned FirstByValReg, LastByValReg;
unsigned ByValIdx = CCInfo.getInRegsParamsProcessed();
CCInfo.getInRegsParamInfo(ByValIdx, FirstByValReg, LastByValReg);
assert(Flags.getByValSize() &&
"ByVal args of size 0 should have been ignored by front-end.");
assert(ByValIdx < CCInfo.getInRegsParamsCount());
copyByValRegs(Chain, DL, OutChains, DAG, Flags, InVals, &*FuncArg,
FirstByValReg, LastByValReg, VA, CCInfo);
CCInfo.nextInRegsParam();
continue;
}
// Arguments stored on registers
if (IsRegLoc) {
MVT RegVT = VA.getLocVT();
unsigned ArgReg = VA.getLocReg();
const TargetRegisterClass *RC = getRegClassFor(RegVT);
// Transform the arguments stored on
// physical registers into virtual ones
unsigned Reg = addLiveIn(DAG.getMachineFunction(), ArgReg, RC);
SDValue ArgValue = DAG.getCopyFromReg(Chain, DL, Reg, RegVT);
ArgValue = UnpackFromArgumentSlot(ArgValue, VA, Ins[i].ArgVT, DL, DAG);
// Handle floating point arguments passed in integer registers and
// long double arguments passed in floating point registers.
if ((RegVT == MVT::i32 && ValVT == MVT::f32) ||
(RegVT == MVT::i64 && ValVT == MVT::f64) ||
(RegVT == MVT::f64 && ValVT == MVT::i64))
ArgValue = DAG.getNode(ISD::BITCAST, DL, ValVT, ArgValue);
else if (Subtarget.isABI_O32() && RegVT == MVT::i32 &&
ValVT == MVT::f64) {
unsigned Reg2 = addLiveIn(DAG.getMachineFunction(),
getNextIntArgReg(ArgReg), RC);
SDValue ArgValue2 = DAG.getCopyFromReg(Chain, DL, Reg2, RegVT);
if (!Subtarget.isLittle())
std::swap(ArgValue, ArgValue2);
ArgValue = DAG.getNode(MipsISD::BuildPairF64, DL, MVT::f64,
ArgValue, ArgValue2);
}
InVals.push_back(ArgValue);
} else { // VA.isRegLoc()
MVT LocVT = VA.getLocVT();
if (Subtarget.isABI_O32()) {
// We ought to be able to use LocVT directly but O32 sets it to i32
// when allocating floating point values to integer registers.
// This shouldn't influence how we load the value into registers unless
// we are targetting softfloat.
if (VA.getValVT().isFloatingPoint() && !Subtarget.abiUsesSoftFloat())
LocVT = VA.getValVT();
}
// sanity check
assert(VA.isMemLoc());
// The stack pointer offset is relative to the caller stack frame.
int FI = MFI->CreateFixedObject(LocVT.getSizeInBits() / 8,
VA.getLocMemOffset(), true);
// Create load nodes to retrieve arguments from the stack
SDValue FIN = DAG.getFrameIndex(FI, getPointerTy());
SDValue ArgValue = DAG.getLoad(LocVT, DL, Chain, FIN,
MachinePointerInfo::getFixedStack(FI),
false, false, false, 0);
OutChains.push_back(ArgValue.getValue(1));
ArgValue = UnpackFromArgumentSlot(ArgValue, VA, Ins[i].ArgVT, DL, DAG);
InVals.push_back(ArgValue);
}
}
for (unsigned i = 0, e = ArgLocs.size(); i != e; ++i) {
// The mips ABIs for returning structs by value requires that we copy
// the sret argument into $v0 for the return. Save the argument into
// a virtual register so that we can access it from the return points.
if (Ins[i].Flags.isSRet()) {
unsigned Reg = MipsFI->getSRetReturnReg();
if (!Reg) {
Reg = MF.getRegInfo().createVirtualRegister(
getRegClassFor(Subtarget.isABI_N64() ? MVT::i64 : MVT::i32));
MipsFI->setSRetReturnReg(Reg);
}
SDValue Copy = DAG.getCopyToReg(DAG.getEntryNode(), DL, Reg, InVals[i]);
Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, Copy, Chain);
break;
}
}
if (IsVarArg)
writeVarArgRegs(OutChains, Chain, DL, DAG, CCInfo);
// All stores are grouped in one node to allow the matching between
// the size of Ins and InVals. This only happens when on varg functions
if (!OutChains.empty()) {
OutChains.push_back(Chain);
Chain = DAG.getNode(ISD::TokenFactor, DL, MVT::Other, OutChains);
}
return Chain;
}
//===----------------------------------------------------------------------===//
// Return Value Calling Convention Implementation
//===----------------------------------------------------------------------===//
bool
MipsTargetLowering::CanLowerReturn(CallingConv::ID CallConv,
MachineFunction &MF, bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
LLVMContext &Context) const {
SmallVector<CCValAssign, 16> RVLocs;
MipsCCState CCInfo(CallConv, IsVarArg, MF, RVLocs, Context);
return CCInfo.CheckReturn(Outs, RetCC_Mips);
}
SDValue
MipsTargetLowering::LowerReturn(SDValue Chain,
CallingConv::ID CallConv, bool IsVarArg,
const SmallVectorImpl<ISD::OutputArg> &Outs,
const SmallVectorImpl<SDValue> &OutVals,
SDLoc DL, SelectionDAG &DAG) const {
// CCValAssign - represent the assignment of
// the return value to a location
SmallVector<CCValAssign, 16> RVLocs;
MachineFunction &MF = DAG.getMachineFunction();
// CCState - Info about the registers and stack slot.
MipsCCState CCInfo(CallConv, IsVarArg, MF, RVLocs, *DAG.getContext());
// Analyze return values.
CCInfo.AnalyzeReturn(Outs, RetCC_Mips);
SDValue Flag;
SmallVector<SDValue, 4> RetOps(1, Chain);
// Copy the result values into the output registers.
for (unsigned i = 0; i != RVLocs.size(); ++i) {
SDValue Val = OutVals[i];
CCValAssign &VA = RVLocs[i];
assert(VA.isRegLoc() && "Can only return in registers!");
bool UseUpperBits = false;
switch (VA.getLocInfo()) {
default:
llvm_unreachable("Unknown loc info!");
case CCValAssign::Full:
break;
case CCValAssign::BCvt:
Val = DAG.getNode(ISD::BITCAST, DL, VA.getLocVT(), Val);
break;
case CCValAssign::AExtUpper:
UseUpperBits = true;
// Fallthrough
case CCValAssign::AExt:
Val = DAG.getNode(ISD::ANY_EXTEND, DL, VA.getLocVT(), Val);
break;
case CCValAssign::ZExtUpper:
UseUpperBits = true;
// Fallthrough
case CCValAssign::ZExt:
Val = DAG.getNode(ISD::ZERO_EXTEND, DL, VA.getLocVT(), Val);
break;
case CCValAssign::SExtUpper:
UseUpperBits = true;
// Fallthrough
case CCValAssign::SExt:
Val = DAG.getNode(ISD::SIGN_EXTEND, DL, VA.getLocVT(), Val);
break;
}
if (UseUpperBits) {
unsigned ValSizeInBits = Outs[i].ArgVT.getSizeInBits();
unsigned LocSizeInBits = VA.getLocVT().getSizeInBits();
Val = DAG.getNode(
ISD::SHL, DL, VA.getLocVT(), Val,
DAG.getConstant(LocSizeInBits - ValSizeInBits, VA.getLocVT()));
}
Chain = DAG.getCopyToReg(Chain, DL, VA.getLocReg(), Val, Flag);
// Guarantee that all emitted copies are stuck together with flags.
Flag = Chain.getValue(1);
RetOps.push_back(DAG.getRegister(VA.getLocReg(), VA.getLocVT()));
}
// The mips ABIs for returning structs by value requires that we copy
// the sret argument into $v0 for the return. We saved the argument into
// a virtual register in the entry block, so now we copy the value out
// and into $v0.
if (MF.getFunction()->hasStructRetAttr()) {
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
unsigned Reg = MipsFI->getSRetReturnReg();
if (!Reg)
llvm_unreachable("sret virtual register not created in the entry block");
SDValue Val = DAG.getCopyFromReg(Chain, DL, Reg, getPointerTy());
unsigned V0 = Subtarget.isABI_N64() ? Mips::V0_64 : Mips::V0;
Chain = DAG.getCopyToReg(Chain, DL, V0, Val, Flag);
Flag = Chain.getValue(1);
RetOps.push_back(DAG.getRegister(V0, getPointerTy()));
}
RetOps[0] = Chain; // Update chain.
// Add the flag if we have it.
if (Flag.getNode())
RetOps.push_back(Flag);
// Return on Mips is always a "jr $ra"
return DAG.getNode(MipsISD::Ret, DL, MVT::Other, RetOps);
}
//===----------------------------------------------------------------------===//
// Mips Inline Assembly Support
//===----------------------------------------------------------------------===//
/// getConstraintType - Given a constraint letter, return the type of
/// constraint it is for this target.
MipsTargetLowering::ConstraintType MipsTargetLowering::
getConstraintType(const std::string &Constraint) const
{
// Mips specific constraints
// GCC config/mips/constraints.md
//
// 'd' : An address register. Equivalent to r
// unless generating MIPS16 code.
// 'y' : Equivalent to r; retained for
// backwards compatibility.
// 'c' : A register suitable for use in an indirect
// jump. This will always be $25 for -mabicalls.
// 'l' : The lo register. 1 word storage.
// 'x' : The hilo register pair. Double word storage.
if (Constraint.size() == 1) {
switch (Constraint[0]) {
default : break;
case 'd':
case 'y':
case 'f':
case 'c':
case 'l':
case 'x':
return C_RegisterClass;
case 'R':
return C_Memory;
}
}
return TargetLowering::getConstraintType(Constraint);
}
/// Examine constraint type and operand type and determine a weight value.
/// This object must already have been set up with the operand type
/// and the current alternative constraint selected.
TargetLowering::ConstraintWeight
MipsTargetLowering::getSingleConstraintMatchWeight(
AsmOperandInfo &info, const char *constraint) const {
ConstraintWeight weight = CW_Invalid;
Value *CallOperandVal = info.CallOperandVal;
// If we don't have a value, we can't do a match,
// but allow it at the lowest weight.
if (!CallOperandVal)
return CW_Default;
Type *type = CallOperandVal->getType();
// Look at the constraint type.
switch (*constraint) {
default:
weight = TargetLowering::getSingleConstraintMatchWeight(info, constraint);
break;
case 'd':
case 'y':
if (type->isIntegerTy())
weight = CW_Register;
break;
case 'f': // FPU or MSA register
if (Subtarget.hasMSA() && type->isVectorTy() &&
cast<VectorType>(type)->getBitWidth() == 128)
weight = CW_Register;
else if (type->isFloatTy())
weight = CW_Register;
break;
case 'c': // $25 for indirect jumps
case 'l': // lo register
case 'x': // hilo register pair
if (type->isIntegerTy())
weight = CW_SpecificReg;
break;
case 'I': // signed 16 bit immediate
case 'J': // integer zero
case 'K': // unsigned 16 bit immediate
case 'L': // signed 32 bit immediate where lower 16 bits are 0
case 'N': // immediate in the range of -65535 to -1 (inclusive)
case 'O': // signed 15 bit immediate (+- 16383)
case 'P': // immediate in the range of 65535 to 1 (inclusive)
if (isa<ConstantInt>(CallOperandVal))
weight = CW_Constant;
break;
case 'R':
weight = CW_Memory;
break;
}
return weight;
}
/// This is a helper function to parse a physical register string and split it
/// into non-numeric and numeric parts (Prefix and Reg). The first boolean flag
/// that is returned indicates whether parsing was successful. The second flag
/// is true if the numeric part exists.
static std::pair<bool, bool>
parsePhysicalReg(StringRef C, std::string &Prefix,
unsigned long long &Reg) {
if (C.front() != '{' || C.back() != '}')
return std::make_pair(false, false);
// Search for the first numeric character.
StringRef::const_iterator I, B = C.begin() + 1, E = C.end() - 1;
I = std::find_if(B, E, std::ptr_fun(isdigit));
Prefix.assign(B, I - B);
// The second flag is set to false if no numeric characters were found.
if (I == E)
return std::make_pair(true, false);
// Parse the numeric characters.
return std::make_pair(!getAsUnsignedInteger(StringRef(I, E - I), 10, Reg),
true);
}
std::pair<unsigned, const TargetRegisterClass *> MipsTargetLowering::
parseRegForInlineAsmConstraint(StringRef C, MVT VT) const {
const TargetRegisterInfo *TRI =
getTargetMachine().getSubtargetImpl()->getRegisterInfo();
const TargetRegisterClass *RC;
std::string Prefix;
unsigned long long Reg;
std::pair<bool, bool> R = parsePhysicalReg(C, Prefix, Reg);
if (!R.first)
return std::make_pair(0U, nullptr);
if ((Prefix == "hi" || Prefix == "lo")) { // Parse hi/lo.
// No numeric characters follow "hi" or "lo".
if (R.second)
return std::make_pair(0U, nullptr);
RC = TRI->getRegClass(Prefix == "hi" ?
Mips::HI32RegClassID : Mips::LO32RegClassID);
return std::make_pair(*(RC->begin()), RC);
} else if (Prefix.compare(0, 4, "$msa") == 0) {
// Parse $msa(ir|csr|access|save|modify|request|map|unmap)
// No numeric characters follow the name.
if (R.second)
return std::make_pair(0U, nullptr);
Reg = StringSwitch<unsigned long long>(Prefix)
.Case("$msair", Mips::MSAIR)
.Case("$msacsr", Mips::MSACSR)
.Case("$msaaccess", Mips::MSAAccess)
.Case("$msasave", Mips::MSASave)
.Case("$msamodify", Mips::MSAModify)
.Case("$msarequest", Mips::MSARequest)
.Case("$msamap", Mips::MSAMap)
.Case("$msaunmap", Mips::MSAUnmap)
.Default(0);
if (!Reg)
return std::make_pair(0U, nullptr);
RC = TRI->getRegClass(Mips::MSACtrlRegClassID);
return std::make_pair(Reg, RC);
}
if (!R.second)
return std::make_pair(0U, nullptr);
if (Prefix == "$f") { // Parse $f0-$f31.
// If the size of FP registers is 64-bit or Reg is an even number, select
// the 64-bit register class. Otherwise, select the 32-bit register class.
if (VT == MVT::Other)
VT = (Subtarget.isFP64bit() || !(Reg % 2)) ? MVT::f64 : MVT::f32;
RC = getRegClassFor(VT);
if (RC == &Mips::AFGR64RegClass) {
assert(Reg % 2 == 0);
Reg >>= 1;
}
} else if (Prefix == "$fcc") // Parse $fcc0-$fcc7.
RC = TRI->getRegClass(Mips::FCCRegClassID);
else if (Prefix == "$w") { // Parse $w0-$w31.
RC = getRegClassFor((VT == MVT::Other) ? MVT::v16i8 : VT);
} else { // Parse $0-$31.
assert(Prefix == "$");
RC = getRegClassFor((VT == MVT::Other) ? MVT::i32 : VT);
}
assert(Reg < RC->getNumRegs());
return std::make_pair(*(RC->begin() + Reg), RC);
}
/// Given a register class constraint, like 'r', if this corresponds directly
/// to an LLVM register class, return a register of 0 and the register class
/// pointer.
std::pair<unsigned, const TargetRegisterClass*> MipsTargetLowering::
getRegForInlineAsmConstraint(const std::string &Constraint, MVT VT) const
{
if (Constraint.size() == 1) {
switch (Constraint[0]) {
case 'd': // Address register. Same as 'r' unless generating MIPS16 code.
case 'y': // Same as 'r'. Exists for compatibility.
case 'r':
if (VT == MVT::i32 || VT == MVT::i16 || VT == MVT::i8) {
if (Subtarget.inMips16Mode())
return std::make_pair(0U, &Mips::CPU16RegsRegClass);
return std::make_pair(0U, &Mips::GPR32RegClass);
}
if (VT == MVT::i64 && !Subtarget.isGP64bit())
return std::make_pair(0U, &Mips::GPR32RegClass);
if (VT == MVT::i64 && Subtarget.isGP64bit())
return std::make_pair(0U, &Mips::GPR64RegClass);
// This will generate an error message
return std::make_pair(0U, nullptr);
case 'f': // FPU or MSA register
if (VT == MVT::v16i8)
return std::make_pair(0U, &Mips::MSA128BRegClass);
else if (VT == MVT::v8i16 || VT == MVT::v8f16)
return std::make_pair(0U, &Mips::MSA128HRegClass);
else if (VT == MVT::v4i32 || VT == MVT::v4f32)
return std::make_pair(0U, &Mips::MSA128WRegClass);
else if (VT == MVT::v2i64 || VT == MVT::v2f64)
return std::make_pair(0U, &Mips::MSA128DRegClass);
else if (VT == MVT::f32)
return std::make_pair(0U, &Mips::FGR32RegClass);
else if ((VT == MVT::f64) && (!Subtarget.isSingleFloat())) {
if (Subtarget.isFP64bit())
return std::make_pair(0U, &Mips::FGR64RegClass);
return std::make_pair(0U, &Mips::AFGR64RegClass);
}
break;
case 'c': // register suitable for indirect jump
if (VT == MVT::i32)
return std::make_pair((unsigned)Mips::T9, &Mips::GPR32RegClass);
assert(VT == MVT::i64 && "Unexpected type.");
return std::make_pair((unsigned)Mips::T9_64, &Mips::GPR64RegClass);
case 'l': // register suitable for indirect jump
if (VT == MVT::i32)
return std::make_pair((unsigned)Mips::LO0, &Mips::LO32RegClass);
return std::make_pair((unsigned)Mips::LO0_64, &Mips::LO64RegClass);
case 'x': // register suitable for indirect jump
// Fixme: Not triggering the use of both hi and low
// This will generate an error message
return std::make_pair(0U, nullptr);
}
}
std::pair<unsigned, const TargetRegisterClass *> R;
R = parseRegForInlineAsmConstraint(Constraint, VT);
if (R.second)
return R;
return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
}
/// LowerAsmOperandForConstraint - Lower the specified operand into the Ops
/// vector. If it is invalid, don't add anything to Ops.
void MipsTargetLowering::LowerAsmOperandForConstraint(SDValue Op,
std::string &Constraint,
std::vector<SDValue>&Ops,
SelectionDAG &DAG) const {
SDValue Result;
// Only support length 1 constraints for now.
if (Constraint.length() > 1) return;
char ConstraintLetter = Constraint[0];
switch (ConstraintLetter) {
default: break; // This will fall through to the generic implementation
case 'I': // Signed 16 bit constant
// If this fails, the parent routine will give an error
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
EVT Type = Op.getValueType();
int64_t Val = C->getSExtValue();
if (isInt<16>(Val)) {
Result = DAG.getTargetConstant(Val, Type);
break;
}
}
return;
case 'J': // integer zero
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
EVT Type = Op.getValueType();
int64_t Val = C->getZExtValue();
if (Val == 0) {
Result = DAG.getTargetConstant(0, Type);
break;
}
}
return;
case 'K': // unsigned 16 bit immediate
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
EVT Type = Op.getValueType();
uint64_t Val = (uint64_t)C->getZExtValue();
if (isUInt<16>(Val)) {
Result = DAG.getTargetConstant(Val, Type);
break;
}
}
return;
case 'L': // signed 32 bit immediate where lower 16 bits are 0
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
EVT Type = Op.getValueType();
int64_t Val = C->getSExtValue();
if ((isInt<32>(Val)) && ((Val & 0xffff) == 0)){
Result = DAG.getTargetConstant(Val, Type);
break;
}
}
return;
case 'N': // immediate in the range of -65535 to -1 (inclusive)
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
EVT Type = Op.getValueType();
int64_t Val = C->getSExtValue();
if ((Val >= -65535) && (Val <= -1)) {
Result = DAG.getTargetConstant(Val, Type);
break;
}
}
return;
case 'O': // signed 15 bit immediate
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
EVT Type = Op.getValueType();
int64_t Val = C->getSExtValue();
if ((isInt<15>(Val))) {
Result = DAG.getTargetConstant(Val, Type);
break;
}
}
return;
case 'P': // immediate in the range of 1 to 65535 (inclusive)
if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
EVT Type = Op.getValueType();
int64_t Val = C->getSExtValue();
if ((Val <= 65535) && (Val >= 1)) {
Result = DAG.getTargetConstant(Val, Type);
break;
}
}
return;
}
if (Result.getNode()) {
Ops.push_back(Result);
return;
}
TargetLowering::LowerAsmOperandForConstraint(Op, Constraint, Ops, DAG);
}
bool MipsTargetLowering::isLegalAddressingMode(const AddrMode &AM,
Type *Ty) const {
// No global is ever allowed as a base.
if (AM.BaseGV)
return false;
switch (AM.Scale) {
case 0: // "r+i" or just "i", depending on HasBaseReg.
break;
case 1:
if (!AM.HasBaseReg) // allow "r+i".
break;
return false; // disallow "r+r" or "r+r+i".
default:
return false;
}
return true;
}
bool
MipsTargetLowering::isOffsetFoldingLegal(const GlobalAddressSDNode *GA) const {
// The Mips target isn't yet aware of offsets.
return false;
}
EVT MipsTargetLowering::getOptimalMemOpType(uint64_t Size, unsigned DstAlign,
unsigned SrcAlign,
bool IsMemset, bool ZeroMemset,
bool MemcpyStrSrc,
MachineFunction &MF) const {
if (Subtarget.hasMips64())
return MVT::i64;
return MVT::i32;
}
bool MipsTargetLowering::isFPImmLegal(const APFloat &Imm, EVT VT) const {
if (VT != MVT::f32 && VT != MVT::f64)
return false;
if (Imm.isNegZero())
return false;
return Imm.isZero();
}
unsigned MipsTargetLowering::getJumpTableEncoding() const {
if (Subtarget.isABI_N64())
return MachineJumpTableInfo::EK_GPRel64BlockAddress;
return TargetLowering::getJumpTableEncoding();
}
void MipsTargetLowering::copyByValRegs(
SDValue Chain, SDLoc DL, std::vector<SDValue> &OutChains, SelectionDAG &DAG,
const ISD::ArgFlagsTy &Flags, SmallVectorImpl<SDValue> &InVals,
const Argument *FuncArg, unsigned FirstReg, unsigned LastReg,
const CCValAssign &VA, MipsCCState &State) const {
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
unsigned GPRSizeInBytes = Subtarget.getGPRSizeInBytes();
unsigned NumRegs = LastReg - FirstReg;
unsigned RegAreaSize = NumRegs * GPRSizeInBytes;
unsigned FrameObjSize = std::max(Flags.getByValSize(), RegAreaSize);
int FrameObjOffset;
const MipsABIInfo &ABI =
static_cast<const MipsTargetMachine &>(MF.getTarget()).getABI();
ArrayRef<MCPhysReg> ByValArgRegs = ABI.GetByValArgRegs();
if (RegAreaSize)
FrameObjOffset =
(int)ABI.GetCalleeAllocdArgSizeInBytes(State.getCallingConv()) -
(int)((ByValArgRegs.size() - FirstReg) * GPRSizeInBytes);
else
FrameObjOffset = VA.getLocMemOffset();
// Create frame object.
EVT PtrTy = getPointerTy();
int FI = MFI->CreateFixedObject(FrameObjSize, FrameObjOffset, true);
SDValue FIN = DAG.getFrameIndex(FI, PtrTy);
InVals.push_back(FIN);
if (!NumRegs)
return;
// Copy arg registers.
MVT RegTy = MVT::getIntegerVT(GPRSizeInBytes * 8);
const TargetRegisterClass *RC = getRegClassFor(RegTy);
for (unsigned I = 0; I < NumRegs; ++I) {
unsigned ArgReg = ByValArgRegs[FirstReg + I];
unsigned VReg = addLiveIn(MF, ArgReg, RC);
unsigned Offset = I * GPRSizeInBytes;
SDValue StorePtr = DAG.getNode(ISD::ADD, DL, PtrTy, FIN,
DAG.getConstant(Offset, PtrTy));
SDValue Store = DAG.getStore(Chain, DL, DAG.getRegister(VReg, RegTy),
StorePtr, MachinePointerInfo(FuncArg, Offset),
false, false, 0);
OutChains.push_back(Store);
}
}
// Copy byVal arg to registers and stack.
void MipsTargetLowering::passByValArg(
SDValue Chain, SDLoc DL,
std::deque<std::pair<unsigned, SDValue>> &RegsToPass,
SmallVectorImpl<SDValue> &MemOpChains, SDValue StackPtr,
MachineFrameInfo *MFI, SelectionDAG &DAG, SDValue Arg, unsigned FirstReg,
unsigned LastReg, const ISD::ArgFlagsTy &Flags, bool isLittle,
const CCValAssign &VA) const {
unsigned ByValSizeInBytes = Flags.getByValSize();
unsigned OffsetInBytes = 0; // From beginning of struct
unsigned RegSizeInBytes = Subtarget.getGPRSizeInBytes();
unsigned Alignment = std::min(Flags.getByValAlign(), RegSizeInBytes);
EVT PtrTy = getPointerTy(), RegTy = MVT::getIntegerVT(RegSizeInBytes * 8);
unsigned NumRegs = LastReg - FirstReg;
if (NumRegs) {
const ArrayRef<MCPhysReg> ArgRegs =
static_cast<const MipsTargetMachine &>(DAG.getTarget())
.getABI()
.GetByValArgRegs();
bool LeftoverBytes = (NumRegs * RegSizeInBytes > ByValSizeInBytes);
unsigned I = 0;
// Copy words to registers.
for (; I < NumRegs - LeftoverBytes; ++I, OffsetInBytes += RegSizeInBytes) {
SDValue LoadPtr = DAG.getNode(ISD::ADD, DL, PtrTy, Arg,
DAG.getConstant(OffsetInBytes, PtrTy));
SDValue LoadVal = DAG.getLoad(RegTy, DL, Chain, LoadPtr,
MachinePointerInfo(), false, false, false,
Alignment);
MemOpChains.push_back(LoadVal.getValue(1));
unsigned ArgReg = ArgRegs[FirstReg + I];
RegsToPass.push_back(std::make_pair(ArgReg, LoadVal));
}
// Return if the struct has been fully copied.
if (ByValSizeInBytes == OffsetInBytes)
return;
// Copy the remainder of the byval argument with sub-word loads and shifts.
if (LeftoverBytes) {
SDValue Val;
for (unsigned LoadSizeInBytes = RegSizeInBytes / 2, TotalBytesLoaded = 0;
OffsetInBytes < ByValSizeInBytes; LoadSizeInBytes /= 2) {
unsigned RemainingSizeInBytes = ByValSizeInBytes - OffsetInBytes;
if (RemainingSizeInBytes < LoadSizeInBytes)
continue;
// Load subword.
SDValue LoadPtr = DAG.getNode(ISD::ADD, DL, PtrTy, Arg,
DAG.getConstant(OffsetInBytes, PtrTy));
SDValue LoadVal = DAG.getExtLoad(
ISD::ZEXTLOAD, DL, RegTy, Chain, LoadPtr, MachinePointerInfo(),
MVT::getIntegerVT(LoadSizeInBytes * 8), false, false, false,
Alignment);
MemOpChains.push_back(LoadVal.getValue(1));
// Shift the loaded value.
unsigned Shamt;
if (isLittle)
Shamt = TotalBytesLoaded * 8;
else
Shamt = (RegSizeInBytes - (TotalBytesLoaded + LoadSizeInBytes)) * 8;
SDValue Shift = DAG.getNode(ISD::SHL, DL, RegTy, LoadVal,
DAG.getConstant(Shamt, MVT::i32));
if (Val.getNode())
Val = DAG.getNode(ISD::OR, DL, RegTy, Val, Shift);
else
Val = Shift;
OffsetInBytes += LoadSizeInBytes;
TotalBytesLoaded += LoadSizeInBytes;
Alignment = std::min(Alignment, LoadSizeInBytes);
}
unsigned ArgReg = ArgRegs[FirstReg + I];
RegsToPass.push_back(std::make_pair(ArgReg, Val));
return;
}
}
// Copy remainder of byval arg to it with memcpy.
unsigned MemCpySize = ByValSizeInBytes - OffsetInBytes;
SDValue Src = DAG.getNode(ISD::ADD, DL, PtrTy, Arg,
DAG.getConstant(OffsetInBytes, PtrTy));
SDValue Dst = DAG.getNode(ISD::ADD, DL, PtrTy, StackPtr,
DAG.getIntPtrConstant(VA.getLocMemOffset()));
Chain = DAG.getMemcpy(Chain, DL, Dst, Src, DAG.getConstant(MemCpySize, PtrTy),
Alignment, /*isVolatile=*/false, /*AlwaysInline=*/false,
MachinePointerInfo(), MachinePointerInfo());
MemOpChains.push_back(Chain);
}
void MipsTargetLowering::writeVarArgRegs(std::vector<SDValue> &OutChains,
SDValue Chain, SDLoc DL,
SelectionDAG &DAG,
CCState &State) const {
const ArrayRef<MCPhysReg> ArgRegs =
static_cast<const MipsTargetMachine &>(DAG.getTarget())
.getABI()
.GetVarArgRegs();
unsigned Idx = State.getFirstUnallocated(ArgRegs.data(), ArgRegs.size());
unsigned RegSizeInBytes = Subtarget.getGPRSizeInBytes();
MVT RegTy = MVT::getIntegerVT(RegSizeInBytes * 8);
const TargetRegisterClass *RC = getRegClassFor(RegTy);
MachineFunction &MF = DAG.getMachineFunction();
MachineFrameInfo *MFI = MF.getFrameInfo();
MipsFunctionInfo *MipsFI = MF.getInfo<MipsFunctionInfo>();
// Offset of the first variable argument from stack pointer.
int VaArgOffset;
if (ArgRegs.size() == Idx)
VaArgOffset =
RoundUpToAlignment(State.getNextStackOffset(), RegSizeInBytes);
else {
const MipsABIInfo &ABI =
static_cast<const MipsTargetMachine &>(MF.getTarget()).getABI();
VaArgOffset =
(int)ABI.GetCalleeAllocdArgSizeInBytes(State.getCallingConv()) -
(int)(RegSizeInBytes * (ArgRegs.size() - Idx));
}
// Record the frame index of the first variable argument
// which is a value necessary to VASTART.
int FI = MFI->CreateFixedObject(RegSizeInBytes, VaArgOffset, true);
MipsFI->setVarArgsFrameIndex(FI);
// Copy the integer registers that have not been used for argument passing
// to the argument register save area. For O32, the save area is allocated
// in the caller's stack frame, while for N32/64, it is allocated in the
// callee's stack frame.
for (unsigned I = Idx; I < ArgRegs.size();
++I, VaArgOffset += RegSizeInBytes) {
unsigned Reg = addLiveIn(MF, ArgRegs[I], RC);
SDValue ArgValue = DAG.getCopyFromReg(Chain, DL, Reg, RegTy);
FI = MFI->CreateFixedObject(RegSizeInBytes, VaArgOffset, true);
SDValue PtrOff = DAG.getFrameIndex(FI, getPointerTy());
SDValue Store = DAG.getStore(Chain, DL, ArgValue, PtrOff,
MachinePointerInfo(), false, false, 0);
cast<StoreSDNode>(Store.getNode())->getMemOperand()->setValue(
(Value *)nullptr);
OutChains.push_back(Store);
}
}
void MipsTargetLowering::HandleByVal(CCState *State, unsigned &Size,
unsigned Align) const {
MachineFunction &MF = State->getMachineFunction();
const TargetFrameLowering *TFL = MF.getSubtarget().getFrameLowering();
assert(Size && "Byval argument's size shouldn't be 0.");
Align = std::min(Align, TFL->getStackAlignment());
unsigned FirstReg = 0;
unsigned NumRegs = 0;
if (State->getCallingConv() != CallingConv::Fast) {
unsigned RegSizeInBytes = Subtarget.getGPRSizeInBytes();
const ArrayRef<MCPhysReg> IntArgRegs =
static_cast<const MipsTargetMachine &>(MF.getTarget())
.getABI()
.GetByValArgRegs();
// FIXME: The O32 case actually describes no shadow registers.
const MCPhysReg *ShadowRegs =
Subtarget.isABI_O32() ? IntArgRegs.data() : Mips64DPRegs;
// We used to check the size as well but we can't do that anymore since
// CCState::HandleByVal() rounds up the size after calling this function.
assert(!(Align % RegSizeInBytes) &&
"Byval argument's alignment should be a multiple of"
"RegSizeInBytes.");
FirstReg = State->getFirstUnallocated(IntArgRegs.data(), IntArgRegs.size());
// If Align > RegSizeInBytes, the first arg register must be even.
// FIXME: This condition happens to do the right thing but it's not the
// right way to test it. We want to check that the stack frame offset
// of the register is aligned.
if ((Align > RegSizeInBytes) && (FirstReg % 2)) {
State->AllocateReg(IntArgRegs[FirstReg], ShadowRegs[FirstReg]);
++FirstReg;
}
// Mark the registers allocated.
Size = RoundUpToAlignment(Size, RegSizeInBytes);
for (unsigned I = FirstReg; Size > 0 && (I < IntArgRegs.size());
Size -= RegSizeInBytes, ++I, ++NumRegs)
State->AllocateReg(IntArgRegs[I], ShadowRegs[I]);
}
State->addInRegsParamInfo(FirstReg, FirstReg + NumRegs);
}
MachineBasicBlock *
MipsTargetLowering::emitPseudoSELECT(MachineInstr *MI, MachineBasicBlock *BB,
bool isFPCmp, unsigned Opc) const {
assert(!(Subtarget.hasMips4() || Subtarget.hasMips32()) &&
"Subtarget already supports SELECT nodes with the use of"
"conditional-move instructions.");
const TargetInstrInfo *TII =
getTargetMachine().getSubtargetImpl()->getInstrInfo();
DebugLoc DL = MI->getDebugLoc();
// To "insert" a SELECT instruction, we actually have to insert the
// diamond control-flow pattern. The incoming instruction knows the
// destination vreg to set, the condition code register to branch on, the
// true/false values to select between, and a branch opcode to use.
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineFunction::iterator It = BB;
++It;
// thisMBB:
// ...
// TrueVal = ...
// setcc r1, r2, r3
// bNE r1, r0, copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *thisMBB = BB;
MachineFunction *F = BB->getParent();
MachineBasicBlock *copy0MBB = F->CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = F->CreateMachineBasicBlock(LLVM_BB);
F->insert(It, copy0MBB);
F->insert(It, sinkMBB);
// Transfer the remainder of BB and its successor edges to sinkMBB.
sinkMBB->splice(sinkMBB->begin(), BB,
std::next(MachineBasicBlock::iterator(MI)), BB->end());
sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
// Next, add the true and fallthrough blocks as its successors.
BB->addSuccessor(copy0MBB);
BB->addSuccessor(sinkMBB);
if (isFPCmp) {
// bc1[tf] cc, sinkMBB
BuildMI(BB, DL, TII->get(Opc))
.addReg(MI->getOperand(1).getReg())
.addMBB(sinkMBB);
} else {
// bne rs, $0, sinkMBB
BuildMI(BB, DL, TII->get(Opc))
.addReg(MI->getOperand(1).getReg())
.addReg(Mips::ZERO)
.addMBB(sinkMBB);
}
// copy0MBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copy0MBB;
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %TrueValue, thisMBB ], [ %FalseValue, copy0MBB ]
// ...
BB = sinkMBB;
BuildMI(*BB, BB->begin(), DL,
TII->get(Mips::PHI), MI->getOperand(0).getReg())
.addReg(MI->getOperand(2).getReg()).addMBB(thisMBB)
.addReg(MI->getOperand(3).getReg()).addMBB(copy0MBB);
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;
}
// FIXME? Maybe this could be a TableGen attribute on some registers and
// this table could be generated automatically from RegInfo.
unsigned MipsTargetLowering::getRegisterByName(const char* RegName,
EVT VT) const {
// Named registers is expected to be fairly rare. For now, just support $28
// since the linux kernel uses it.
if (Subtarget.isGP64bit()) {
unsigned Reg = StringSwitch<unsigned>(RegName)
.Case("$28", Mips::GP_64)
.Default(0);
if (Reg)
return Reg;
} else {
unsigned Reg = StringSwitch<unsigned>(RegName)
.Case("$28", Mips::GP)
.Default(0);
if (Reg)
return Reg;
}
report_fatal_error("Invalid register name global variable");
}
Reference in New Issue View Git Blame Copy Permalink