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llvm-mirror/lib/Target/VE/VEInstrInfo.cpp
Kazushi (Jam) Marukawa efd49fca73 [VE] Support f128 
Support f128 using VE instructions.  Update regression tests.
I've noticed there is no load or store i128 test, so I add them too.

Reviewed By: simoll

Differential Revision: https://reviews.llvm.org/D86035
2020-08-17 17:26:52 +09:00

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//===-- VEInstrInfo.cpp - VE Instruction Information ----------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains the VE implementation of the TargetInstrInfo class.
//
//===----------------------------------------------------------------------===//
#include "VEInstrInfo.h"
#include "VE.h"
#include "VEMachineFunctionInfo.h"
#include "VESubtarget.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/TargetRegistry.h"
#define DEBUG_TYPE "ve-instr-info"
using namespace llvm;
#define GET_INSTRINFO_CTOR_DTOR
#include "VEGenInstrInfo.inc"
// Pin the vtable to this file.
void VEInstrInfo::anchor() {}
VEInstrInfo::VEInstrInfo(VESubtarget &ST)
: VEGenInstrInfo(VE::ADJCALLSTACKDOWN, VE::ADJCALLSTACKUP), RI() {}
static bool IsIntegerCC(unsigned CC) { return (CC < VECC::CC_AF); }
static VECC::CondCode GetOppositeBranchCondition(VECC::CondCode CC) {
switch (CC) {
case VECC::CC_IG:
return VECC::CC_ILE;
case VECC::CC_IL:
return VECC::CC_IGE;
case VECC::CC_INE:
return VECC::CC_IEQ;
case VECC::CC_IEQ:
return VECC::CC_INE;
case VECC::CC_IGE:
return VECC::CC_IL;
case VECC::CC_ILE:
return VECC::CC_IG;
case VECC::CC_AF:
return VECC::CC_AT;
case VECC::CC_G:
return VECC::CC_LENAN;
case VECC::CC_L:
return VECC::CC_GENAN;
case VECC::CC_NE:
return VECC::CC_EQNAN;
case VECC::CC_EQ:
return VECC::CC_NENAN;
case VECC::CC_GE:
return VECC::CC_LNAN;
case VECC::CC_LE:
return VECC::CC_GNAN;
case VECC::CC_NUM:
return VECC::CC_NAN;
case VECC::CC_NAN:
return VECC::CC_NUM;
case VECC::CC_GNAN:
return VECC::CC_LE;
case VECC::CC_LNAN:
return VECC::CC_GE;
case VECC::CC_NENAN:
return VECC::CC_EQ;
case VECC::CC_EQNAN:
return VECC::CC_NE;
case VECC::CC_GENAN:
return VECC::CC_L;
case VECC::CC_LENAN:
return VECC::CC_G;
case VECC::CC_AT:
return VECC::CC_AF;
case VECC::UNKNOWN:
return VECC::UNKNOWN;
}
llvm_unreachable("Invalid cond code");
}
// Treat br.l [BRCF AT] as unconditional branch
static bool isUncondBranchOpcode(int Opc) {
return Opc == VE::BRCFLa || Opc == VE::BRCFWa ||
Opc == VE::BRCFLa_nt || Opc == VE::BRCFWa_nt ||
Opc == VE::BRCFLa_t || Opc == VE::BRCFWa_t ||
Opc == VE::BRCFDa || Opc == VE::BRCFSa ||
Opc == VE::BRCFDa_nt || Opc == VE::BRCFSa_nt ||
Opc == VE::BRCFDa_t || Opc == VE::BRCFSa_t;
}
static bool isCondBranchOpcode(int Opc) {
return Opc == VE::BRCFLrr || Opc == VE::BRCFLir ||
Opc == VE::BRCFLrr_nt || Opc == VE::BRCFLir_nt ||
Opc == VE::BRCFLrr_t || Opc == VE::BRCFLir_t ||
Opc == VE::BRCFWrr || Opc == VE::BRCFWir ||
Opc == VE::BRCFWrr_nt || Opc == VE::BRCFWir_nt ||
Opc == VE::BRCFWrr_t || Opc == VE::BRCFWir_t ||
Opc == VE::BRCFDrr || Opc == VE::BRCFDir ||
Opc == VE::BRCFDrr_nt || Opc == VE::BRCFDir_nt ||
Opc == VE::BRCFDrr_t || Opc == VE::BRCFDir_t ||
Opc == VE::BRCFSrr || Opc == VE::BRCFSir ||
Opc == VE::BRCFSrr_nt || Opc == VE::BRCFSir_nt ||
Opc == VE::BRCFSrr_t || Opc == VE::BRCFSir_t;
}
static bool isIndirectBranchOpcode(int Opc) {
return Opc == VE::BCFLari || Opc == VE::BCFLari ||
Opc == VE::BCFLari_nt || Opc == VE::BCFLari_nt ||
Opc == VE::BCFLari_t || Opc == VE::BCFLari_t ||
Opc == VE::BCFLari || Opc == VE::BCFLari ||
Opc == VE::BCFLari_nt || Opc == VE::BCFLari_nt ||
Opc == VE::BCFLari_t || Opc == VE::BCFLari_t;
}
static void parseCondBranch(MachineInstr *LastInst, MachineBasicBlock *&Target,
SmallVectorImpl<MachineOperand> &Cond) {
Cond.push_back(MachineOperand::CreateImm(LastInst->getOperand(0).getImm()));
Cond.push_back(LastInst->getOperand(1));
Cond.push_back(LastInst->getOperand(2));
Target = LastInst->getOperand(3).getMBB();
}
bool VEInstrInfo::analyzeBranch(MachineBasicBlock &MBB, MachineBasicBlock *&TBB,
MachineBasicBlock *&FBB,
SmallVectorImpl<MachineOperand> &Cond,
bool AllowModify) const {
MachineBasicBlock::iterator I = MBB.getLastNonDebugInstr();
if (I == MBB.end())
return false;
if (!isUnpredicatedTerminator(*I))
return false;
// Get the last instruction in the block.
MachineInstr *LastInst = &*I;
unsigned LastOpc = LastInst->getOpcode();
// If there is only one terminator instruction, process it.
if (I == MBB.begin() || !isUnpredicatedTerminator(*--I)) {
if (isUncondBranchOpcode(LastOpc)) {
TBB = LastInst->getOperand(0).getMBB();
return false;
}
if (isCondBranchOpcode(LastOpc)) {
// Block ends with fall-through condbranch.
parseCondBranch(LastInst, TBB, Cond);
return false;
}
return true; // Can't handle indirect branch.
}
// Get the instruction before it if it is a terminator.
MachineInstr *SecondLastInst = &*I;
unsigned SecondLastOpc = SecondLastInst->getOpcode();
// If AllowModify is true and the block ends with two or more unconditional
// branches, delete all but the first unconditional branch.
if (AllowModify && isUncondBranchOpcode(LastOpc)) {
while (isUncondBranchOpcode(SecondLastOpc)) {
LastInst->eraseFromParent();
LastInst = SecondLastInst;
LastOpc = LastInst->getOpcode();
if (I == MBB.begin() || !isUnpredicatedTerminator(*--I)) {
// Return now the only terminator is an unconditional branch.
TBB = LastInst->getOperand(0).getMBB();
return false;
}
SecondLastInst = &*I;
SecondLastOpc = SecondLastInst->getOpcode();
}
}
// If there are three terminators, we don't know what sort of block this is.
if (SecondLastInst && I != MBB.begin() && isUnpredicatedTerminator(*--I))
return true;
// If the block ends with a B and a Bcc, handle it.
if (isCondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
parseCondBranch(SecondLastInst, TBB, Cond);
FBB = LastInst->getOperand(0).getMBB();
return false;
}
// If the block ends with two unconditional branches, handle it. The second
// one is not executed.
if (isUncondBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
TBB = SecondLastInst->getOperand(0).getMBB();
return false;
}
// ...likewise if it ends with an indirect branch followed by an unconditional
// branch.
if (isIndirectBranchOpcode(SecondLastOpc) && isUncondBranchOpcode(LastOpc)) {
I = LastInst;
if (AllowModify)
I->eraseFromParent();
return true;
}
// Otherwise, can't handle this.
return true;
}
unsigned VEInstrInfo::insertBranch(MachineBasicBlock &MBB,
MachineBasicBlock *TBB,
MachineBasicBlock *FBB,
ArrayRef<MachineOperand> Cond,
const DebugLoc &DL, int *BytesAdded) const {
assert(TBB && "insertBranch must not be told to insert a fallthrough");
assert((Cond.size() == 3 || Cond.size() == 0) &&
"VE branch conditions should have three component!");
assert(!BytesAdded && "code size not handled");
if (Cond.empty()) {
// Uncondition branch
assert(!FBB && "Unconditional branch with multiple successors!");
BuildMI(&MBB, DL, get(VE::BRCFLa_t))
.addMBB(TBB);
return 1;
}
// Conditional branch
// (BRCFir CC sy sz addr)
assert(Cond[0].isImm() && Cond[2].isReg() && "not implemented");
unsigned opc[2];
const TargetRegisterInfo *TRI = &getRegisterInfo();
MachineFunction *MF = MBB.getParent();
const MachineRegisterInfo &MRI = MF->getRegInfo();
unsigned Reg = Cond[2].getReg();
if (IsIntegerCC(Cond[0].getImm())) {
if (TRI->getRegSizeInBits(Reg, MRI) == 32) {
opc[0] = VE::BRCFWir;
opc[1] = VE::BRCFWrr;
} else {
opc[0] = VE::BRCFLir;
opc[1] = VE::BRCFLrr;
}
} else {
if (TRI->getRegSizeInBits(Reg, MRI) == 32) {
opc[0] = VE::BRCFSir;
opc[1] = VE::BRCFSrr;
} else {
opc[0] = VE::BRCFDir;
opc[1] = VE::BRCFDrr;
}
}
if (Cond[1].isImm()) {
BuildMI(&MBB, DL, get(opc[0]))
.add(Cond[0]) // condition code
.add(Cond[1]) // lhs
.add(Cond[2]) // rhs
.addMBB(TBB);
} else {
BuildMI(&MBB, DL, get(opc[1]))
.add(Cond[0])
.add(Cond[1])
.add(Cond[2])
.addMBB(TBB);
}
if (!FBB)
return 1;
BuildMI(&MBB, DL, get(VE::BRCFLa_t))
.addMBB(FBB);
return 2;
}
unsigned VEInstrInfo::removeBranch(MachineBasicBlock &MBB,
int *BytesRemoved) const {
assert(!BytesRemoved && "code size not handled");
MachineBasicBlock::iterator I = MBB.end();
unsigned Count = 0;
while (I != MBB.begin()) {
--I;
if (I->isDebugValue())
continue;
if (!isUncondBranchOpcode(I->getOpcode()) &&
!isCondBranchOpcode(I->getOpcode()))
break; // Not a branch
I->eraseFromParent();
I = MBB.end();
++Count;
}
return Count;
}
bool VEInstrInfo::reverseBranchCondition(
SmallVectorImpl<MachineOperand> &Cond) const {
VECC::CondCode CC = static_cast<VECC::CondCode>(Cond[0].getImm());
Cond[0].setImm(GetOppositeBranchCondition(CC));
return false;
}
static bool IsAliasOfSX(Register Reg) {
return VE::I32RegClass.contains(Reg) || VE::I64RegClass.contains(Reg) ||
VE::F32RegClass.contains(Reg);
}
static void copyPhysSubRegs(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I, const DebugLoc &DL,
MCRegister DestReg, MCRegister SrcReg, bool KillSrc,
const MCInstrDesc &MCID, unsigned int NumSubRegs,
const unsigned *SubRegIdx,
const TargetRegisterInfo *TRI) {
MachineInstr *MovMI = nullptr;
for (unsigned Idx = 0; Idx != NumSubRegs; ++Idx) {
Register SubDest = TRI->getSubReg(DestReg, SubRegIdx[Idx]);
Register SubSrc = TRI->getSubReg(SrcReg, SubRegIdx[Idx]);
assert(SubDest && SubSrc && "Bad sub-register");
if (MCID.getOpcode() == VE::ORri) {
// generate "ORri, dest, src, 0" instruction.
MachineInstrBuilder MIB =
BuildMI(MBB, I, DL, MCID, SubDest).addReg(SubSrc).addImm(0);
MovMI = MIB.getInstr();
} else {
llvm_unreachable("Unexpected reg-to-reg copy instruction");
}
}
// Add implicit super-register defs and kills to the last MovMI.
MovMI->addRegisterDefined(DestReg, TRI);
if (KillSrc)
MovMI->addRegisterKilled(SrcReg, TRI, true);
}
void VEInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I, const DebugLoc &DL,
MCRegister DestReg, MCRegister SrcReg,
bool KillSrc) const {
if (IsAliasOfSX(SrcReg) && IsAliasOfSX(DestReg)) {
BuildMI(MBB, I, DL, get(VE::ORri), DestReg)
.addReg(SrcReg, getKillRegState(KillSrc))
.addImm(0);
} else if (VE::F128RegClass.contains(DestReg, SrcReg)) {
// Use two instructions.
const unsigned SubRegIdx[] = {VE::sub_even, VE::sub_odd};
unsigned int NumSubRegs = 2;
copyPhysSubRegs(MBB, I, DL, DestReg, SrcReg, KillSrc, get(VE::ORri),
NumSubRegs, SubRegIdx, &getRegisterInfo());
} else {
const TargetRegisterInfo *TRI = &getRegisterInfo();
dbgs() << "Impossible reg-to-reg copy from " << printReg(SrcReg, TRI)
<< " to " << printReg(DestReg, TRI) << "\n";
llvm_unreachable("Impossible reg-to-reg copy");
}
}
/// isLoadFromStackSlot - If the specified machine instruction is a direct
/// load from a stack slot, return the virtual or physical register number of
/// the destination along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than loading from the stack slot.
unsigned VEInstrInfo::isLoadFromStackSlot(const MachineInstr &MI,
int &FrameIndex) const {
if (MI.getOpcode() == VE::LDrii || // I64
MI.getOpcode() == VE::LDLSXrii || // I32
MI.getOpcode() == VE::LDUrii || // F32
MI.getOpcode() == VE::LDQrii // F128 (pseudo)
) {
if (MI.getOperand(1).isFI() && MI.getOperand(2).isImm() &&
MI.getOperand(2).getImm() == 0 && MI.getOperand(3).isImm() &&
MI.getOperand(3).getImm() == 0) {
FrameIndex = MI.getOperand(1).getIndex();
return MI.getOperand(0).getReg();
}
}
return 0;
}
/// isStoreToStackSlot - If the specified machine instruction is a direct
/// store to a stack slot, return the virtual or physical register number of
/// the source reg along with the FrameIndex of the loaded stack slot. If
/// not, return 0. This predicate must return 0 if the instruction has
/// any side effects other than storing to the stack slot.
unsigned VEInstrInfo::isStoreToStackSlot(const MachineInstr &MI,
int &FrameIndex) const {
if (MI.getOpcode() == VE::STrii || // I64
MI.getOpcode() == VE::STLrii || // I32
MI.getOpcode() == VE::STUrii || // F32
MI.getOpcode() == VE::STQrii // F128 (pseudo)
) {
if (MI.getOperand(0).isFI() && MI.getOperand(1).isImm() &&
MI.getOperand(1).getImm() == 0 && MI.getOperand(2).isImm() &&
MI.getOperand(2).getImm() == 0) {
FrameIndex = MI.getOperand(0).getIndex();
return MI.getOperand(3).getReg();
}
}
return 0;
}
void VEInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
Register SrcReg, bool isKill, int FI,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const {
DebugLoc DL;
if (I != MBB.end())
DL = I->getDebugLoc();
MachineFunction *MF = MBB.getParent();
const MachineFrameInfo &MFI = MF->getFrameInfo();
MachineMemOperand *MMO = MF->getMachineMemOperand(
MachinePointerInfo::getFixedStack(*MF, FI), MachineMemOperand::MOStore,
MFI.getObjectSize(FI), MFI.getObjectAlign(FI));
// On the order of operands here: think "[FrameIdx + 0] = SrcReg".
if (RC == &VE::I64RegClass) {
BuildMI(MBB, I, DL, get(VE::STrii))
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addReg(SrcReg, getKillRegState(isKill))
.addMemOperand(MMO);
} else if (RC == &VE::I32RegClass) {
BuildMI(MBB, I, DL, get(VE::STLrii))
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addReg(SrcReg, getKillRegState(isKill))
.addMemOperand(MMO);
} else if (RC == &VE::F32RegClass) {
BuildMI(MBB, I, DL, get(VE::STUrii))
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addReg(SrcReg, getKillRegState(isKill))
.addMemOperand(MMO);
} else if (VE::F128RegClass.hasSubClassEq(RC)) {
BuildMI(MBB, I, DL, get(VE::STQrii))
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addReg(SrcReg, getKillRegState(isKill))
.addMemOperand(MMO);
} else
report_fatal_error("Can't store this register to stack slot");
}
void VEInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
Register DestReg, int FI,
const TargetRegisterClass *RC,
const TargetRegisterInfo *TRI) const {
DebugLoc DL;
if (I != MBB.end())
DL = I->getDebugLoc();
MachineFunction *MF = MBB.getParent();
const MachineFrameInfo &MFI = MF->getFrameInfo();
MachineMemOperand *MMO = MF->getMachineMemOperand(
MachinePointerInfo::getFixedStack(*MF, FI), MachineMemOperand::MOLoad,
MFI.getObjectSize(FI), MFI.getObjectAlign(FI));
if (RC == &VE::I64RegClass) {
BuildMI(MBB, I, DL, get(VE::LDrii), DestReg)
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addMemOperand(MMO);
} else if (RC == &VE::I32RegClass) {
BuildMI(MBB, I, DL, get(VE::LDLSXrii), DestReg)
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addMemOperand(MMO);
} else if (RC == &VE::F32RegClass) {
BuildMI(MBB, I, DL, get(VE::LDUrii), DestReg)
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addMemOperand(MMO);
} else if (VE::F128RegClass.hasSubClassEq(RC)) {
BuildMI(MBB, I, DL, get(VE::LDQrii), DestReg)
.addFrameIndex(FI)
.addImm(0)
.addImm(0)
.addMemOperand(MMO);
} else
report_fatal_error("Can't load this register from stack slot");
}
Register VEInstrInfo::getGlobalBaseReg(MachineFunction *MF) const {
VEMachineFunctionInfo *VEFI = MF->getInfo<VEMachineFunctionInfo>();
Register GlobalBaseReg = VEFI->getGlobalBaseReg();
if (GlobalBaseReg != 0)
return GlobalBaseReg;
// We use %s15 (%got) as a global base register
GlobalBaseReg = VE::SX15;
// Insert a pseudo instruction to set the GlobalBaseReg into the first
// MBB of the function
MachineBasicBlock &FirstMBB = MF->front();
MachineBasicBlock::iterator MBBI = FirstMBB.begin();
DebugLoc dl;
BuildMI(FirstMBB, MBBI, dl, get(VE::GETGOT), GlobalBaseReg);
VEFI->setGlobalBaseReg(GlobalBaseReg);
return GlobalBaseReg;
}
bool VEInstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
switch (MI.getOpcode()) {
case VE::EXTEND_STACK: {
return expandExtendStackPseudo(MI);
}
case VE::EXTEND_STACK_GUARD: {
MI.eraseFromParent(); // The pseudo instruction is gone now.
return true;
}
case VE::GETSTACKTOP: {
return expandGetStackTopPseudo(MI);
}
}
return false;
}
bool VEInstrInfo::expandExtendStackPseudo(MachineInstr &MI) const {
MachineBasicBlock &MBB = *MI.getParent();
MachineFunction &MF = *MBB.getParent();
const VESubtarget &STI = MF.getSubtarget<VESubtarget>();
const VEInstrInfo &TII = *STI.getInstrInfo();
DebugLoc dl = MBB.findDebugLoc(MI);
// Create following instructions and multiple basic blocks.
//
// thisBB:
// brge.l.t %sp, %sl, sinkBB
// syscallBB:
// ld %s61, 0x18(, %tp) // load param area
// or %s62, 0, %s0 // spill the value of %s0
// lea %s63, 0x13b // syscall # of grow
// shm.l %s63, 0x0(%s61) // store syscall # at addr:0
// shm.l %sl, 0x8(%s61) // store old limit at addr:8
// shm.l %sp, 0x10(%s61) // store new limit at addr:16
// monc // call monitor
// or %s0, 0, %s62 // restore the value of %s0
// sinkBB:
// Create new MBB
MachineBasicBlock *BB = &MBB;
const BasicBlock *LLVM_BB = BB->getBasicBlock();
MachineBasicBlock *syscallMBB = MF.CreateMachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = MF.CreateMachineBasicBlock(LLVM_BB);
MachineFunction::iterator It = ++(BB->getIterator());
MF.insert(It, syscallMBB);
MF.insert(It, sinkMBB);
// Transfer the remainder of BB and its successor edges to sinkMBB.
sinkMBB->splice(sinkMBB->begin(), BB,
std::next(std::next(MachineBasicBlock::iterator(MI))),
BB->end());
sinkMBB->transferSuccessorsAndUpdatePHIs(BB);
// Next, add the true and fallthrough blocks as its successors.
BB->addSuccessor(syscallMBB);
BB->addSuccessor(sinkMBB);
BuildMI(BB, dl, TII.get(VE::BRCFLrr_t))
.addImm(VECC::CC_IGE)
.addReg(VE::SX11) // %sp
.addReg(VE::SX8) // %sl
.addMBB(sinkMBB);
BB = syscallMBB;
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
BuildMI(BB, dl, TII.get(VE::LDrii), VE::SX61)
.addReg(VE::SX14)
.addImm(0)
.addImm(0x18);
BuildMI(BB, dl, TII.get(VE::ORri), VE::SX62)
.addReg(VE::SX0)
.addImm(0);
BuildMI(BB, dl, TII.get(VE::LEAzii), VE::SX63)
.addImm(0)
.addImm(0)
.addImm(0x13b);
BuildMI(BB, dl, TII.get(VE::SHMLri))
.addReg(VE::SX61)
.addImm(0)
.addReg(VE::SX63);
BuildMI(BB, dl, TII.get(VE::SHMLri))
.addReg(VE::SX61)
.addImm(8)
.addReg(VE::SX8);
BuildMI(BB, dl, TII.get(VE::SHMLri))
.addReg(VE::SX61)
.addImm(16)
.addReg(VE::SX11);
BuildMI(BB, dl, TII.get(VE::MONC));
BuildMI(BB, dl, TII.get(VE::ORri), VE::SX0)
.addReg(VE::SX62)
.addImm(0);
MI.eraseFromParent(); // The pseudo instruction is gone now.
return true;
}
bool VEInstrInfo::expandGetStackTopPseudo(MachineInstr &MI) const {
MachineBasicBlock *MBB = MI.getParent();
MachineFunction &MF = *MBB->getParent();
const VESubtarget &STI = MF.getSubtarget<VESubtarget>();
const VEInstrInfo &TII = *STI.getInstrInfo();
DebugLoc DL = MBB->findDebugLoc(MI);
// Create following instruction
//
// dst = %sp + target specific frame + the size of parameter area
const MachineFrameInfo &MFI = MF.getFrameInfo();
const VEFrameLowering &TFL = *STI.getFrameLowering();
// The VE ABI requires a reserved 176 bytes area at the top
// of stack as described in VESubtarget.cpp. So, we adjust it here.
unsigned NumBytes = STI.getAdjustedFrameSize(0);
// Also adds the size of parameter area.
if (MFI.adjustsStack() && TFL.hasReservedCallFrame(MF))
NumBytes += MFI.getMaxCallFrameSize();
BuildMI(*MBB, MI, DL, TII.get(VE::LEArii))
.addDef(MI.getOperand(0).getReg())
.addReg(VE::SX11)
.addImm(0)
.addImm(NumBytes);
MI.eraseFromParent(); // The pseudo instruction is gone now.
return true;
}
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