#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"
+#include "llvm/Support/CommandLine.h"
using namespace llvm;
+static cl::opt<bool>
+ForceStackAlign("force-align-stack",
+ cl::desc("Force align the stack to the minimum alignment"
+ " needed for the function."),
+ cl::init(false), cl::Hidden);
+
X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm,
const TargetInstrInfo &tii)
: X86GenRegisterInfo(tm.getSubtarget<X86Subtarget>().is64Bit() ?
case X86::ST4: case X86::ST5: case X86::ST6: case X86::ST7:
return RegNo-X86::ST0;
- case X86::XMM0: case X86::XMM8: case X86::MM0:
+ case X86::XMM0: case X86::XMM8:
+ case X86::YMM0: case X86::YMM8: case X86::MM0:
+ return 0;
+ case X86::XMM1: case X86::XMM9:
+ case X86::YMM1: case X86::YMM9: case X86::MM1:
+ return 1;
+ case X86::XMM2: case X86::XMM10:
+ case X86::YMM2: case X86::YMM10: case X86::MM2:
+ return 2;
+ case X86::XMM3: case X86::XMM11:
+ case X86::YMM3: case X86::YMM11: case X86::MM3:
+ return 3;
+ case X86::XMM4: case X86::XMM12:
+ case X86::YMM4: case X86::YMM12: case X86::MM4:
+ return 4;
+ case X86::XMM5: case X86::XMM13:
+ case X86::YMM5: case X86::YMM13: case X86::MM5:
+ return 5;
+ case X86::XMM6: case X86::XMM14:
+ case X86::YMM6: case X86::YMM14: case X86::MM6:
+ return 6;
+ case X86::XMM7: case X86::XMM15:
+ case X86::YMM7: case X86::YMM15: case X86::MM7:
+ return 7;
+
+ case X86::ES:
+ return 0;
+ case X86::CS:
+ return 1;
+ case X86::SS:
+ return 2;
+ case X86::DS:
+ return 3;
+ case X86::FS:
+ return 4;
+ case X86::GS:
+ return 5;
+
+ case X86::CR0:
+ return 0;
+ case X86::CR1:
+ return 1;
+ case X86::CR2:
+ return 2;
+ case X86::CR3:
+ return 3;
+ case X86::CR4:
+ return 4;
+
+ case X86::DR0:
return 0;
- case X86::XMM1: case X86::XMM9: case X86::MM1:
+ case X86::DR1:
return 1;
- case X86::XMM2: case X86::XMM10: case X86::MM2:
+ case X86::DR2:
return 2;
- case X86::XMM3: case X86::XMM11: case X86::MM3:
+ case X86::DR3:
return 3;
- case X86::XMM4: case X86::XMM12: case X86::MM4:
+ case X86::DR4:
return 4;
- case X86::XMM5: case X86::XMM13: case X86::MM5:
+ case X86::DR5:
return 5;
- case X86::XMM6: case X86::XMM14: case X86::MM6:
+ case X86::DR6:
return 6;
- case X86::XMM7: case X86::XMM15: case X86::MM7:
+ case X86::DR7:
return 7;
+ // Pseudo index registers are equivalent to a "none"
+ // scaled index (See Intel Manual 2A, table 2-3)
+ case X86::EIZ:
+ case X86::RIZ:
+ return 4;
+
default:
assert(isVirtualRegister(RegNo) && "Unknown physical register!");
llvm_unreachable("Register allocator hasn't allocated reg correctly yet!");
unsigned SubIdx) const {
switch (SubIdx) {
default: return 0;
- case 1:
- // 8-bit
+ case X86::sub_8bit:
if (B == &X86::GR8RegClass) {
if (A->getSize() == 2 || A->getSize() == 4 || A->getSize() == 8)
return A;
return &X86::GR16_NOREXRegClass;
else if (A == &X86::GR16_ABCDRegClass)
return &X86::GR16_ABCDRegClass;
- } else if (B == &X86::FR32RegClass) {
- return A;
}
break;
- case 2:
- // 8-bit hi
+ case X86::sub_8bit_hi:
if (B == &X86::GR8_ABCD_HRegClass) {
if (A == &X86::GR64RegClass || A == &X86::GR64_ABCDRegClass ||
A == &X86::GR64_NOREXRegClass ||
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:
- // 16-bit
+ case X86::sub_16bit:
if (B == &X86::GR16RegClass) {
if (A->getSize() == 4 || A->getSize() == 8)
return A;
return &X86::GR32_NOREXRegClass;
else if (A == &X86::GR32_ABCDRegClass)
return &X86::GR64_ABCDRegClass;
- } else if (B == &X86::VR128RegClass) {
- return A;
}
break;
- case 4:
- // 32-bit
+ case X86::sub_32bit:
if (B == &X86::GR32RegClass || B == &X86::GR32_NOSPRegClass) {
if (A->getSize() == 8)
return A;
return &X86::GR64_ABCDRegClass;
}
break;
+ case X86::sub_ss:
+ if (B == &X86::FR32RegClass)
+ return A;
+ break;
+ case X86::sub_sd:
+ if (B == &X86::FR64RegClass)
+ return A;
+ break;
+ case X86::sub_xmm:
+ if (B == &X86::VR128RegClass)
+ return A;
+ break;
}
return 0;
}
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);
}
}
}
-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);
- }
-
- static const TargetRegisterClass * const CalleeSavedRegClasses32Bit[] = {
- &X86::GR32RegClass, &X86::GR32RegClass,
- &X86::GR32RegClass, &X86::GR32RegClass, 0
- };
- static const TargetRegisterClass * const CalleeSavedRegClasses32EHRet[] = {
- &X86::GR32RegClass, &X86::GR32RegClass,
- &X86::GR32RegClass, &X86::GR32RegClass,
- &X86::GR32RegClass, &X86::GR32RegClass, 0
- };
- static const TargetRegisterClass * const CalleeSavedRegClasses64Bit[] = {
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass, 0
- };
- static const TargetRegisterClass * const CalleeSavedRegClasses64EHRet[] = {
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass, 0
- };
- static const TargetRegisterClass * const CalleeSavedRegClassesWin64[] = {
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::GR64RegClass, &X86::GR64RegClass,
- &X86::VR128RegClass, &X86::VR128RegClass,
- &X86::VR128RegClass, &X86::VR128RegClass,
- &X86::VR128RegClass, &X86::VR128RegClass,
- &X86::VR128RegClass, &X86::VR128RegClass,
- &X86::VR128RegClass, &X86::VR128RegClass, 0
- };
-
- if (Is64Bit) {
- if (IsWin64)
- return CalleeSavedRegClassesWin64;
- else
- return (callsEHReturn ?
- CalleeSavedRegClasses64EHRet : CalleeSavedRegClasses64Bit);
- } else {
- return (callsEHReturn ?
- CalleeSavedRegClasses32EHRet : CalleeSavedRegClasses32Bit);
- }
-}
-
BitVector X86RegisterInfo::getReservedRegs(const MachineFunction &MF) const {
BitVector Reserved(getNumRegs());
// Set the stack-pointer register and its aliases as reserved.
/// 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 {
bool X86RegisterInfo::needsStackRealignment(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
const Function *F = MF.getFunction();
- bool requiresRealignment =
- RealignStack && ((MFI->getMaxAlignment() > StackAlign) ||
- F->hasFnAttr(Attribute::StackAlignment));
+ bool requiresRealignment = ((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.
+ // FIXME: It's more complicated than this...
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());
+
+ // If we've requested that we force align the stack do so now.
+ if (ForceStackAlign)
+ return canRealignStack(MF);
+
+ return requiresRealignment && canRealignStack(MF);
}
-bool X86RegisterInfo::hasReservedCallFrame(MachineFunction &MF) const {
+bool X86RegisterInfo::hasReservedCallFrame(const MachineFunction &MF) const {
return !MF.getFrameInfo()->hasVarSizedObjects();
}
-bool X86RegisterInfo::hasReservedSpillSlot(MachineFunction &MF, unsigned Reg,
- int &FrameIdx) const {
+bool X86RegisterInfo::hasReservedSpillSlot(const MachineFunction &MF,
+ unsigned Reg, int &FrameIdx) const {
if (Reg == FramePtr && hasFP(MF)) {
FrameIdx = MF.getFrameInfo()->getObjectIndexBegin();
return true;
return Offset;
}
+static unsigned getSUBriOpcode(unsigned is64Bit, int64_t Imm) {
+ if (is64Bit) {
+ if (isInt<8>(Imm))
+ return X86::SUB64ri8;
+ return X86::SUB64ri32;
+ } else {
+ if (isInt<8>(Imm))
+ return X86::SUB32ri8;
+ return X86::SUB32ri;
+ }
+}
+
+static unsigned getADDriOpcode(unsigned is64Bit, int64_t Imm) {
+ if (is64Bit) {
+ if (isInt<8>(Imm))
+ return X86::ADD64ri8;
+ return X86::ADD64ri32;
+ } else {
+ if (isInt<8>(Imm))
+ return X86::ADD32ri8;
+ return X86::ADD32ri;
+ }
+}
+
void X86RegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
MachineInstr *New = 0;
if (Old->getOpcode() == getCallFrameSetupOpcode()) {
New = BuildMI(MF, Old->getDebugLoc(),
- TII.get(Is64Bit ? X86::SUB64ri32 : X86::SUB32ri),
+ TII.get(getSUBriOpcode(Is64Bit, Amount)),
StackPtr)
.addReg(StackPtr)
.addImm(Amount);
Amount -= CalleeAmt;
if (Amount) {
- unsigned Opc = (Amount < 128) ?
- (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
- (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri);
+ unsigned Opc = getADDriOpcode(Is64Bit, Amount);
New = BuildMI(MF, Old->getDebugLoc(), TII.get(Opc), StackPtr)
.addReg(StackPtr)
.addImm(Amount);
// something off the stack pointer, add it back. We do this until we have
// more advanced stack pointer tracking ability.
if (uint64_t CalleeAmt = I->getOperand(1).getImm()) {
- unsigned Opc = (CalleeAmt < 128) ?
- (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
- (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri);
+ unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt);
MachineInstr *Old = I;
MachineInstr *New =
BuildMI(MF, Old->getDebugLoc(), TII.get(Opc),
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;
// }
// [EBP]
MFI->CreateFixedObject(-TailCallReturnAddrDelta,
- (-1U*SlotSize)+TailCallReturnAddrDelta,
- true, false);
+ (-1U*SlotSize)+TailCallReturnAddrDelta, true);
}
if (hasFP(MF)) {
-(int)SlotSize +
TFI.getOffsetOfLocalArea() +
TailCallReturnAddrDelta,
- true, false);
+ true);
assert(FrameIdx == MFI->getObjectIndexBegin() &&
"Slot for EBP register must be last in order to be found!");
FrameIdx = 0;
const TargetInstrInfo &TII) {
bool isSub = NumBytes < 0;
uint64_t Offset = isSub ? -NumBytes : NumBytes;
- unsigned Opc = isSub
- ? ((Offset < 128) ?
- (Is64Bit ? X86::SUB64ri8 : X86::SUB32ri8) :
- (Is64Bit ? X86::SUB64ri32 : X86::SUB32ri))
- : ((Offset < 128) ?
- (Is64Bit ? X86::ADD64ri8 : X86::ADD32ri8) :
- (Is64Bit ? X86::ADD64ri32 : X86::ADD32ri));
+ unsigned Opc = isSub ?
+ getSUBriOpcode(Is64Bit, Offset) :
+ getADDriOpcode(Is64Bit, Offset);
uint64_t Chunk = (1LL << 31) - 1;
DebugLoc DL = MBB.findDebugLoc(MBBI);
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);
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.
bool HasFP = hasFP(MF);
DebugLoc DL;
+ // If we're forcing a stack realignment we can't rely on just the frame
+ // info, we need to know the ABI stack alignment as well in case we
+ // have a call out. Otherwise just make sure we have some alignment - we'll
+ // go with the minimum SlotSize.
+ if (ForceStackAlign) {
+ if (MFI->hasCalls())
+ MaxAlign = (StackAlign > MaxAlign) ? StackAlign : MaxAlign;
+ else if (MaxAlign < SlotSize)
+ MaxAlign = SlotSize;
+ }
+
// Add RETADDR move area to callee saved frame size.
int TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
if (TailCallReturnAddrDelta < 0)
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;
// size is bigger than the callers.
if (TailCallReturnAddrDelta < 0) {
MachineInstr *MI =
- BuildMI(MBB, MBBI, DL, TII.get(Is64Bit? X86::SUB64ri32 : X86::SUB32ri),
+ BuildMI(MBB, MBBI, DL,
+ TII.get(getSUBriOpcode(Is64Bit, -TailCallReturnAddrDelta)),
StackPtr)
.addReg(StackPtr)
.addImm(-TailCallReturnAddrDelta);
// 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 = -TD->getPointerSize();
if (needsFrameMoves) {
// Mark the place where EBP/RBP was saved.
- MCSymbol *FrameLabel = MMI->getLabelSym(MMI->NextLabelID());
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(FrameLabel);
+ MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL)).addSym(FrameLabel);
// Define the current CFA rule to use the provided offset.
if (StackSize) {
if (needsFrameMoves) {
// Mark effective beginning of when frame pointer becomes valid.
- MCSymbol *FrameLabel = MMI->getLabelSym(MMI->NextLabelID());
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(FrameLabel);
+ MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL)).addSym(FrameLabel);
// Define the current CFA to use the EBP/RBP register.
MachineLocation FPDst(FramePtr);
if (!HasFP && needsFrameMoves) {
// Mark callee-saved push instruction.
- MCSymbol *Label = MMI->getLabelSym(MMI->NextLabelID());
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(Label);
+ MCSymbol *Label = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL)).addSym(Label);
// Define the current CFA rule to use the provided offset.
unsigned Ptr = StackSize ?
if ((NumBytes || PushedRegs) && needsFrameMoves) {
// Mark end of stack pointer adjustment.
- MCSymbol *Label = MMI->getLabelSym(MMI->NextLabelID());
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addSym(Label);
+ MCSymbol *Label = MMI.getContext().CreateTempSymbol();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL)).addSym(Label);
if (!HasFP && NumBytes) {
// Define the current CFA rule to use the provided offset.
unsigned CSSize = X86FI->getCalleeSavedFrameSize();
uint64_t NumBytes = 0;
+ // If we're forcing a stack realignment we can't rely on just the frame
+ // info, we need to know the ABI stack alignment as well in case we
+ // have a call out. Otherwise just make sure we have some alignment - we'll
+ // go with the minimum.
+ if (ForceStackAlign) {
+ if (MFI->hasCalls())
+ MaxAlign = (StackAlign > MaxAlign) ? StackAlign : MaxAlign;
+ else
+ MaxAlign = MaxAlign ? MaxAlign : 4;
+ }
+
if (hasFP(MF)) {
// Calculate required stack adjustment.
uint64_t FrameSize = StackSize - SlotSize;
if (CSSize) {
unsigned Opc = Is64Bit ? X86::LEA64r : X86::LEA32r;
MachineInstr *MI =
- addLeaRegOffset(BuildMI(MF, DL, TII.get(Opc), StackPtr),
- FramePtr, false, -CSSize);
+ addRegOffset(BuildMI(MF, DL, TII.get(Opc), StackPtr),
+ FramePtr, false, -CSSize);
MBB.insert(MBBI, MI);
} else {
BuildMI(MBB, MBBI, DL,
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());
+ BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr64)).
+ addReg(JumpTarget.getReg(), RegState::Kill);
} else {
- BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr), JumpTarget.getReg());
+ BuildMI(MBB, MBBI, DL, TII.get(X86::TAILJMPr)).
+ addReg(JumpTarget.getReg(), RegState::Kill);
}
MachineInstr *NewMI = prior(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 MSAH : public MachineFunctionPass {
+ static char ID;
+ MSAH() : MachineFunctionPass(&ID) {}
+
+ virtual bool runOnMachineFunction(MachineFunction &MF) {
+ 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();
+
+ // 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)
+ if (RI.getRegClass(RegNum)->getAlignment() > StackAlignment) {
+ FuncInfo->setReserveFP(true);
+ return true;
+ }
+
+ // Nothing to do
+ return false;
+ }
+
+ virtual const char *getPassName() const {
+ return "X86 Maximal Stack Alignment Check";
+ }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesCFG();
+ MachineFunctionPass::getAnalysisUsage(AU);
+ }
+ };
+
+ char MSAH::ID = 0;
+}
+
+FunctionPass*
+llvm::createX86MaxStackAlignmentHeuristicPass() { return new MSAH(); }
projects / oota-llvm.git / blobdiff