#include "llvm/Target/TargetOptions.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
-#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
using namespace llvm;
return &X86::GR16_NOREXRegClass;
else if (A == &X86::GR16_ABCDRegClass)
return &X86::GR16_ABCDRegClass;
+ } else if (B == &X86::FR32RegClass) {
+ return A;
}
break;
case 2:
else if (A == &X86::GR16RegClass || A == &X86::GR16_ABCDRegClass ||
A == &X86::GR16_NOREXRegClass)
return &X86::GR16_ABCDRegClass;
+ } else if (B == &X86::FR64RegClass) {
+ return A;
}
break;
case 3:
return &X86::GR32_NOREXRegClass;
else if (A == &X86::GR32_ABCDRegClass)
return &X86::GR64_ABCDRegClass;
+ } else if (B == &X86::VR128RegClass) {
+ return A;
}
break;
case 4:
const unsigned *
X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
bool callsEHReturn = false;
+ bool ghcCall = false;
if (MF) {
- const MachineFrameInfo *MFI = MF->getFrameInfo();
- const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
- callsEHReturn = (MMI ? MMI->callsEHReturn() : false);
+ callsEHReturn = MF->getMMI().callsEHReturn();
+ const Function *F = MF->getFunction();
+ ghcCall = (F ? F->getCallingConv() == CallingConv::GHC : false);
}
+ static const unsigned GhcCalleeSavedRegs[] = {
+ 0
+ };
+
static const unsigned CalleeSavedRegs32Bit[] = {
X86::ESI, X86::EDI, X86::EBX, X86::EBP, 0
};
X86::XMM14, X86::XMM15, 0
};
- if (Is64Bit) {
+ if (ghcCall) {
+ return GhcCalleeSavedRegs;
+ } else if (Is64Bit) {
if (IsWin64)
return CalleeSavedRegsWin64;
else
const TargetRegisterClass* const*
X86RegisterInfo::getCalleeSavedRegClasses(const MachineFunction *MF) const {
bool callsEHReturn = false;
-
- if (MF) {
- const MachineFrameInfo *MFI = MF->getFrameInfo();
- const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
- callsEHReturn = (MMI ? MMI->callsEHReturn() : false);
- }
+ if (MF)
+ callsEHReturn = MF->getMMI().callsEHReturn();
static const TargetRegisterClass * const CalleeSavedRegClasses32Bit[] = {
&X86::GR32RegClass, &X86::GR32RegClass,
// Stack Frame Processing methods
//===----------------------------------------------------------------------===//
-static unsigned calculateMaxStackAlignment(const MachineFrameInfo *FFI) {
- unsigned MaxAlign = 0;
-
- for (int i = FFI->getObjectIndexBegin(),
- e = FFI->getObjectIndexEnd(); i != e; ++i) {
- if (FFI->isDeadObjectIndex(i))
- continue;
-
- unsigned Align = FFI->getObjectAlignment(i);
- MaxAlign = std::max(MaxAlign, Align);
- }
-
- return MaxAlign;
-}
-
/// hasFP - Return true if the specified function should have a dedicated frame
/// pointer register. This is true if the function has variable sized allocas
/// or if frame pointer elimination is disabled.
bool X86RegisterInfo::hasFP(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
- const MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
+ const MachineModuleInfo &MMI = MF.getMMI();
- return (NoFramePointerElim ||
+ return (DisableFramePointerElim(MF) ||
needsStackRealignment(MF) ||
MFI->hasVarSizedObjects() ||
MFI->isFrameAddressTaken() ||
MF.getInfo<X86MachineFunctionInfo>()->getForceFramePointer() ||
- (MMI && MMI->callsUnwindInit()));
+ MMI.callsUnwindInit());
+}
+
+bool X86RegisterInfo::canRealignStack(const MachineFunction &MF) const {
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ return (RealignStack &&
+ !MFI->hasVarSizedObjects());
}
bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
+ const Function *F = MF.getFunction();
bool requiresRealignment =
- RealignStack && (MFI->getMaxAlignment() > StackAlign);
+ RealignStack && ((MFI->getMaxAlignment() > StackAlign) ||
+ F->hasFnAttr(Attribute::StackAlignment));
// FIXME: Currently we don't support stack realignment for functions with
// variable-sized allocas.
// FIXME: Temporary disable the error - it seems to be too conservative.
if (0 && requiresRealignment && MFI->hasVarSizedObjects())
- llvm_report_error(
+ report_fatal_error(
"Stack realignment in presense of dynamic allocas is not supported");
return (requiresRealignment && !MFI->hasVarSizedObjects());
}
int
-X86RegisterInfo::getFrameIndexOffset(MachineFunction &MF, int FI) const {
+X86RegisterInfo::getFrameIndexOffset(const MachineFunction &MF, int FI) const {
const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
- MachineFrameInfo *MFI = MF.getFrameInfo();
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
int Offset = MFI->getObjectOffset(FI) - TFI.getOffsetOfLocalArea();
uint64_t StackSize = MFI->getStackSize();
Offset += SlotSize;
} else {
unsigned Align = MFI->getObjectAlignment(FI);
- assert( (-(Offset + StackSize)) % Align == 0);
+ assert((-(Offset + StackSize)) % Align == 0);
Align = 0;
return Offset + StackSize;
}
Offset += SlotSize;
// Skip the RETADDR move area
- X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
+ const X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
if (TailCallReturnAddrDelta < 0)
Offset -= TailCallReturnAddrDelta;
unsigned
X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, int *Value,
+ int SPAdj, FrameIndexValue *Value,
RegScavenger *RS) const{
assert(SPAdj == 0 && "Unexpected");
int FrameIndex = MI.getOperand(i).getIndex();
unsigned BasePtr;
+ unsigned Opc = MI.getOpcode();
+ bool AfterFPPop = Opc == X86::TAILJMPm64 || Opc == X86::TAILJMPm;
if (needsStackRealignment(MF))
BasePtr = (FrameIndex < 0 ? FramePtr : StackPtr);
+ else if (AfterFPPop)
+ BasePtr = StackPtr;
else
BasePtr = (hasFP(MF) ? FramePtr : StackPtr);
MI.getOperand(i).ChangeToRegister(BasePtr, false);
// Now add the frame object offset to the offset from EBP.
+ int FIOffset;
+ if (AfterFPPop) {
+ // Tail call jmp happens after FP is popped.
+ const TargetFrameInfo &TFI = *MF.getTarget().getFrameInfo();
+ const MachineFrameInfo *MFI = MF.getFrameInfo();
+ FIOffset = MFI->getObjectOffset(FrameIndex) - TFI.getOffsetOfLocalArea();
+ } else
+ FIOffset = getFrameIndexOffset(MF, FrameIndex);
+
if (MI.getOperand(i+3).isImm()) {
// Offset is a 32-bit integer.
- int Offset = getFrameIndexOffset(MF, FrameIndex) +
- (int)(MI.getOperand(i + 3).getImm());
-
+ int Offset = FIOffset + (int)(MI.getOperand(i + 3).getImm());
MI.getOperand(i + 3).ChangeToImmediate(Offset);
} else {
// Offset is symbolic. This is extremely rare.
- uint64_t Offset = getFrameIndexOffset(MF, FrameIndex) +
- (uint64_t)MI.getOperand(i+3).getOffset();
+ uint64_t Offset = FIOffset + (uint64_t)MI.getOperand(i+3).getOffset();
MI.getOperand(i+3).setOffset(Offset);
}
return 0;
RegScavenger *RS) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
- // Calculate and set max stack object alignment early, so we can decide
- // whether we will need stack realignment (and thus FP).
- unsigned MaxAlign = std::max(MFI->getMaxAlignment(),
- calculateMaxStackAlignment(MFI));
-
- MFI->setMaxAlignment(MaxAlign);
-
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
int32_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
(Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
(Is64Bit ? X86::ADD64ri32 : X86::ADD32ri));
uint64_t Chunk = (1LL << 31) - 1;
- DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() :
- DebugLoc::getUnknownLoc());
+ DebugLoc DL = MBB.findDebugLoc(MBBI);
while (Offset) {
uint64_t ThisVal = (Offset > Chunk) ? Chunk : Offset;
if (MBBI == MBB.end()) return;
- MachineBasicBlock::iterator NI = next(MBBI);
+ MachineBasicBlock::iterator NI = llvm::next(MBBI);
if (NI == MBB.end()) return;
unsigned Opc = NI->getOpcode();
return 0;
MachineBasicBlock::iterator PI = doMergeWithPrevious ? prior(MBBI) : MBBI;
- MachineBasicBlock::iterator NI = doMergeWithPrevious ? 0 : next(MBBI);
+ MachineBasicBlock::iterator NI = doMergeWithPrevious ? 0 : llvm::next(MBBI);
unsigned Opc = PI->getOpcode();
int Offset = 0;
}
void X86RegisterInfo::emitCalleeSavedFrameMoves(MachineFunction &MF,
- unsigned LabelId,
+ MCSymbol *Label,
unsigned FramePtr) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
- MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
- if (!MMI) return;
+ MachineModuleInfo &MMI = MF.getMMI();
// Add callee saved registers to move list.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
if (CSI.empty()) return;
- std::vector<MachineMove> &Moves = MMI->getFrameMoves();
+ std::vector<MachineMove> &Moves = MMI.getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();
bool HasFP = hasFP(MF);
MachineLocation CSDst(MachineLocation::VirtualFP, Offset);
MachineLocation CSSrc(Reg);
- Moves.push_back(MachineMove(LabelId, CSDst, CSSrc));
+ Moves.push_back(MachineMove(Label, CSDst, CSSrc));
}
}
MachineFrameInfo *MFI = MF.getFrameInfo();
const Function *Fn = MF.getFunction();
const X86Subtarget *Subtarget = &MF.getTarget().getSubtarget<X86Subtarget>();
- MachineModuleInfo *MMI = MFI->getMachineModuleInfo();
+ MachineModuleInfo &MMI = MF.getMMI();
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
- bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
+ bool needsFrameMoves = MMI.hasDebugInfo() ||
!Fn->doesNotThrow() || UnwindTablesMandatory;
uint64_t MaxAlign = MFI->getMaxAlignment(); // Desired stack alignment.
uint64_t StackSize = MFI->getStackSize(); // Number of bytes to allocate.
if (Is64Bit && !Fn->hasFnAttr(Attribute::NoRedZone) &&
!needsStackRealignment(MF) &&
!MFI->hasVarSizedObjects() && // No dynamic alloca.
- !MFI->hasCalls() && // No calls.
+ !MFI->adjustsStack() && // No calls.
!Subtarget->isTargetWin64()) { // Win64 has no Red Zone
uint64_t MinSize = X86FI->getCalleeSavedFrameSize();
if (HasFP) MinSize += SlotSize;
// REG < 64 => DW_CFA_offset + Reg
// ELSE => DW_CFA_offset_extended
- std::vector<MachineMove> &Moves = MMI->getFrameMoves();
+ std::vector<MachineMove> &Moves = MMI.getFrameMoves();
const TargetData *TD = MF.getTarget().getTargetData();
uint64_t NumBytes = 0;
- int stackGrowth =
- (MF.getTarget().getFrameInfo()->getStackGrowthDirection() ==
- TargetFrameInfo::StackGrowsUp ?
- TD->getPointerSize() : -TD->getPointerSize());
+ int stackGrowth = -TD->getPointerSize();
if (HasFP) {
// Calculate required stack adjustment.
if (needsFrameMoves) {
// Mark the place where EBP/RBP was saved.
- unsigned FrameLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId);
+ MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(FrameLabel);
// Define the current CFA rule to use the provided offset.
if (StackSize) {
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP, 2 * stackGrowth);
- Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
+ Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
} else {
// FIXME: Verify & implement for FP
MachineLocation SPDst(StackPtr);
MachineLocation SPSrc(StackPtr, stackGrowth);
- Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
+ Moves.push_back(MachineMove(FrameLabel, SPDst, SPSrc));
}
// Change the rule for the FramePtr to be an "offset" rule.
- MachineLocation FPDst(MachineLocation::VirtualFP,
- 2 * stackGrowth);
+ MachineLocation FPDst(MachineLocation::VirtualFP, 2 * stackGrowth);
MachineLocation FPSrc(FramePtr);
- Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
+ Moves.push_back(MachineMove(FrameLabel, FPDst, FPSrc));
}
// Update EBP with the new base value...
if (needsFrameMoves) {
// Mark effective beginning of when frame pointer becomes valid.
- unsigned FrameLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(FrameLabelId);
+ MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(FrameLabel);
// Define the current CFA to use the EBP/RBP register.
MachineLocation FPDst(FramePtr);
MachineLocation FPSrc(MachineLocation::VirtualFP);
- Moves.push_back(MachineMove(FrameLabelId, FPDst, FPSrc));
+ Moves.push_back(MachineMove(FrameLabel, FPDst, FPSrc));
}
// Mark the FramePtr as live-in in every block except the entry.
- for (MachineFunction::iterator I = next(MF.begin()), E = MF.end();
+ for (MachineFunction::iterator I = llvm::next(MF.begin()), E = MF.end();
I != E; ++I)
I->addLiveIn(FramePtr);
if (!HasFP && needsFrameMoves) {
// Mark callee-saved push instruction.
- unsigned LabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId);
+ MCSymbol *Label = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(Label);
// Define the current CFA rule to use the provided offset.
unsigned Ptr = StackSize ?
MachineLocation::VirtualFP : StackPtr;
MachineLocation SPDst(Ptr);
MachineLocation SPSrc(Ptr, StackOffset);
- Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
+ Moves.push_back(MachineMove(Label, SPDst, SPSrc));
StackOffset += stackGrowth;
}
}
- if (MBBI != MBB.end())
- DL = MBBI->getDebugLoc();
+ DL = MBB.findDebugLoc(MBBI);
// Adjust stack pointer: ESP -= numbytes.
if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) {
BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
.addImm(NumBytes);
BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
- .addExternalSymbol("_alloca");
+ .addExternalSymbol("_alloca")
+ .addReg(StackPtr, RegState::Define | RegState::Implicit);
} else {
// Save EAX
BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
.addImm(NumBytes - 4);
BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
- .addExternalSymbol("_alloca");
+ .addExternalSymbol("_alloca")
+ .addReg(StackPtr, RegState::Define | RegState::Implicit);
// Restore EAX
MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),
if ((NumBytes || PushedRegs) && needsFrameMoves) {
// Mark end of stack pointer adjustment.
- unsigned LabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(LabelId);
+ MCSymbol *Label = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(Label);
if (!HasFP && NumBytes) {
// Define the current CFA rule to use the provided offset.
MachineLocation SPDst(MachineLocation::VirtualFP);
MachineLocation SPSrc(MachineLocation::VirtualFP,
-StackSize + stackGrowth);
- Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
+ Moves.push_back(MachineMove(Label, SPDst, SPSrc));
} else {
// FIXME: Verify & implement for FP
MachineLocation SPDst(StackPtr);
MachineLocation SPSrc(StackPtr, stackGrowth);
- Moves.push_back(MachineMove(LabelId, SPDst, SPSrc));
+ Moves.push_back(MachineMove(Label, SPDst, SPSrc));
}
}
// Emit DWARF info specifying the offsets of the callee-saved registers.
if (PushedRegs)
- emitCalleeSavedFrameMoves(MF, LabelId, HasFP ? FramePtr : StackPtr);
+ emitCalleeSavedFrameMoves(MF, Label, HasFP ? FramePtr : StackPtr);
}
}
case X86::RETI:
case X86::TCRETURNdi:
case X86::TCRETURNri:
- case X86::TCRETURNri64:
+ case X86::TCRETURNmi:
case X86::TCRETURNdi64:
+ case X86::TCRETURNri64:
+ case X86::TCRETURNmi64:
case X86::EH_RETURN:
case X86::EH_RETURN64:
- case X86::TAILJMPd:
- case X86::TAILJMPr:
- case X86::TAILJMPm:
break; // These are ok
}
TII.get(Is64Bit ? X86::MOV64rr : X86::MOV32rr),
StackPtr).addReg(DestAddr.getReg());
} else if (RetOpcode == X86::TCRETURNri || RetOpcode == X86::TCRETURNdi ||
- RetOpcode== X86::TCRETURNri64 || RetOpcode == X86::TCRETURNdi64) {
+ RetOpcode == X86::TCRETURNmi ||
+ RetOpcode == X86::TCRETURNri64 || RetOpcode == X86::TCRETURNdi64 ||
+ RetOpcode == X86::TCRETURNmi64) {
+ bool isMem = RetOpcode == X86::TCRETURNmi || RetOpcode == X86::TCRETURNmi64;
// Tail call return: adjust the stack pointer and jump to callee.
MBBI = prior(MBB.end());
MachineOperand &JumpTarget = MBBI->getOperand(0);
- MachineOperand &StackAdjust = MBBI->getOperand(1);
+ MachineOperand &StackAdjust = MBBI->getOperand(isMem ? 5 : 1);
assert(StackAdjust.isImm() && "Expecting immediate value.");
// Adjust stack pointer.
}
// Jump to label or value in register.
- if (RetOpcode == X86::TCRETURNdi|| RetOpcode == X86::TCRETURNdi64)
- BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPd)).
- addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset());
- else if (RetOpcode== X86::TCRETURNri64)
+ if (RetOpcode == X86::TCRETURNdi || RetOpcode == X86::TCRETURNdi64) {
+ BuildMI(MBB, MBBI, DL, TII.get((RetOpcode == X86::TCRETURNdi)
+ ? X86::TAILJMPd : X86::TAILJMPd64)).
+ addGlobalAddress(JumpTarget.getGlobal(), JumpTarget.getOffset(),
+ JumpTarget.getTargetFlags());
+ } else if (RetOpcode == X86::TCRETURNmi || RetOpcode == X86::TCRETURNmi64) {
+ MachineInstrBuilder MIB =
+ BuildMI(MBB, MBBI, DL, TII.get((RetOpcode == X86::TCRETURNmi)
+ ? X86::TAILJMPm : X86::TAILJMPm64));
+ for (unsigned i = 0; i != 5; ++i)
+ MIB.addOperand(MBBI->getOperand(i));
+ } else if (RetOpcode == X86::TCRETURNri64) {
BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr64), JumpTarget.getReg());
- else
+ } else {
BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr), JumpTarget.getReg());
+ }
+
+ MachineInstr *NewMI = prior(MBBI);
+ for (unsigned i = 2, e = MBBI->getNumOperands(); i != e; ++i)
+ NewMI->addOperand(MBBI->getOperand(i));
// Delete the pseudo instruction TCRETURN.
MBB.erase(MBBI);
// Calculate amount of bytes used for return address storing
int stackGrowth = (Is64Bit ? -8 : -4);
- // Initial state of the frame pointer is esp+4.
+ // Initial state of the frame pointer is esp+stackGrowth.
MachineLocation Dst(MachineLocation::VirtualFP);
MachineLocation Src(StackPtr, stackGrowth);
Moves.push_back(MachineMove(0, Dst, Src));
#include "X86GenRegisterInfo.inc"
namespace {
- struct MSAC : public MachineFunctionPass {
+ struct MSAH : public MachineFunctionPass {
static char ID;
- MSAC() : MachineFunctionPass(&ID) {}
+ MSAH() : MachineFunctionPass(&ID) {}
virtual bool runOnMachineFunction(MachineFunction &MF) {
- MachineFrameInfo *FFI = MF.getFrameInfo();
+ const X86TargetMachine *TM =
+ static_cast<const X86TargetMachine *>(&MF.getTarget());
+ const X86RegisterInfo *X86RI = TM->getRegisterInfo();
MachineRegisterInfo &RI = MF.getRegInfo();
+ X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
+ unsigned StackAlignment = X86RI->getStackAlignment();
- // Calculate max stack alignment of all already allocated stack objects.
- unsigned MaxAlign = calculateMaxStackAlignment(FFI);
-
- // Be over-conservative: scan over all vreg defs and find, whether vector
- // registers are used. If yes - there is probability, that vector register
- // will be spilled and thus stack needs to be aligned properly.
+ // Be over-conservative: scan over all vreg defs and find whether vector
+ // registers are used. If yes, there is a possibility that vector register
+ // will be spilled and thus require dynamic stack realignment.
for (unsigned RegNum = TargetRegisterInfo::FirstVirtualRegister;
RegNum < RI.getLastVirtReg(); ++RegNum)
- MaxAlign = std::max(MaxAlign, RI.getRegClass(RegNum)->getAlignment());
-
- if (FFI->getMaxAlignment() == MaxAlign)
- return false;
+ if (RI.getRegClass(RegNum)->getAlignment() > StackAlignment) {
+ FuncInfo->setReserveFP(true);
+ return true;
+ }
- FFI->setMaxAlignment(MaxAlign);
- return true;
+ // Nothing to do
+ return false;
}
virtual const char *getPassName() const {
- return "X86 Maximal Stack Alignment Calculator";
+ return "X86 Maximal Stack Alignment Check";
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
}
};
- char MSAC::ID = 0;
+ char MSAH::ID = 0;
}
FunctionPass*
-llvm::createX86MaxStackAlignmentCalculatorPass() { return new MSAC(); }
+llvm::createX86MaxStackAlignmentHeuristicPass() { return new MSAH(); }
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