TargetFrameInfo::StackGrowsUp ?
TD->getPointerSize() : -TD->getPointerSize());
+ MachineLocation FPDst(hasFP(MF) ? FramePtr : StackPtr);
+ MachineLocation FPSrc(MachineLocation::VirtualFP);
+ Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
+
if (StackSize) {
// Show update of SP.
if (hasFP(MF)) {
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
}
} else {
- //FIXME: Verify & implement for FP
+ // FIXME: Verify & implement for FP
MachineLocation SPDst(StackPtr);
MachineLocation SPSrc(StackPtr, stackGrowth);
Moves.push_back(MachineMove(FrameLabelId, SPDst, SPSrc));
MachineLocation FPSrc(FramePtr);
Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
-
- MachineLocation FPDst(hasFP(MF) ? FramePtr : StackPtr);
- MachineLocation FPSrc(MachineLocation::VirtualFP);
- Moves.push_back(MachineMove(ReadyLabelId, FPDst, FPSrc));
}
bool needsFrameMoves = (MMI && MMI->hasDebugInfo()) ||
!Fn->doesNotThrow() ||
UnwindTablesMandatory;
- DebugLoc DL = (MBBI != MBB.end() ? MBBI->getDebugLoc() :
- DebugLoc::getUnknownLoc());
+ DebugLoc DL;
// Prepare for frame info.
unsigned FrameLabelId = 0;
// function, and use up to 128 bytes of stack space, don't have a frame
// pointer, calls, or dynamic alloca then we do not need to adjust the
// stack pointer (we fit in the Red Zone).
+ bool DisableRedZone = Fn->hasFnAttr(Attribute::NoRedZone);
if (Is64Bit && !DisableRedZone &&
!needsStackRealignment(MF) &&
!MFI->hasVarSizedObjects() && // No dynamic alloca.
- !MFI->hasCalls()) { // No calls.
+ !MFI->hasCalls() && // No calls.
+ !Subtarget->isTargetWin64()) { // Win64 has no Red Zone
uint64_t MinSize = X86FI->getCalleeSavedFrameSize();
if (hasFP(MF)) MinSize += SlotSize;
StackSize = std::max(MinSize,
// Save EBP into the appropriate stack slot...
BuildMI(MBB, MBBI, DL, TII.get(Is64Bit ? X86::PUSH64r : X86::PUSH32r))
- .addReg(FramePtr, /*isDef=*/false, /*isImp=*/false, /*isKill=*/true);
+ .addReg(FramePtr, RegState::Kill);
if (needsFrameMoves) {
// Mark effective beginning of when frame pointer becomes valid.
NumBytes = StackSize - X86FI->getCalleeSavedFrameSize();
}
- unsigned ReadyLabelId = 0;
- if (needsFrameMoves) {
- // Mark effective beginning of when frame pointer is ready.
- ReadyLabelId = MMI->NextLabelID();
- BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(ReadyLabelId);
- }
-
// Skip the callee-saved push instructions.
while (MBBI != MBB.end() &&
(MBBI->getOpcode() == X86::PUSH32r ||
if (MBBI != MBB.end())
DL = MBBI->getDebugLoc();
- if (NumBytes) { // adjust stack pointer: ESP -= numbytes
- if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) {
- // Check, whether EAX is livein for this function
- bool isEAXAlive = false;
- for (MachineRegisterInfo::livein_iterator
+ // Adjust stack pointer: ESP -= numbytes.
+ if (NumBytes >= 4096 && Subtarget->isTargetCygMing()) {
+ // Check, whether EAX is livein for this function.
+ bool isEAXAlive = false;
+ for (MachineRegisterInfo::livein_iterator
II = MF.getRegInfo().livein_begin(),
EE = MF.getRegInfo().livein_end(); (II != EE) && !isEAXAlive; ++II) {
- unsigned Reg = II->first;
- isEAXAlive = (Reg == X86::EAX || Reg == X86::AX ||
- Reg == X86::AH || Reg == X86::AL);
- }
+ unsigned Reg = II->first;
+ isEAXAlive = (Reg == X86::EAX || Reg == X86::AX ||
+ Reg == X86::AH || Reg == X86::AL);
+ }
- // Function prologue calls _alloca to probe the stack when allocating
- // more than 4k bytes in one go. Touching the stack at 4K increments is
- // necessary to ensure that the guard pages used by the OS virtual memory
- // manager are allocated in correct sequence.
- if (!isEAXAlive) {
- BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
- .addImm(NumBytes);
- BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
- .addExternalSymbol("_alloca");
- } else {
- // Save EAX
- BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
- .addReg(X86::EAX, /*isDef=*/false, /*isImp=*/false, /*isKill=*/true);
- // Allocate NumBytes-4 bytes on stack. We'll also use 4 already
- // allocated bytes for EAX.
- BuildMI(MBB, MBBI, DL,
- TII.get(X86::MOV32ri), X86::EAX).addImm(NumBytes-4);
- BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
- .addExternalSymbol("_alloca");
- // Restore EAX
- MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),
- X86::EAX),
- StackPtr, false, NumBytes-4);
- MBB.insert(MBBI, MI);
- }
+ // Function prologue calls _alloca to probe the stack when allocating more
+ // than 4k bytes in one go. Touching the stack at 4K increments is necessary
+ // to ensure that the guard pages used by the OS virtual memory manager are
+ // allocated in correct sequence.
+ if (!isEAXAlive) {
+ BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
+ .addImm(NumBytes);
+ BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
+ .addExternalSymbol("_alloca");
} else {
- // If there is an SUB32ri of ESP immediately before this instruction,
- // merge the two. This can be the case when tail call elimination is
- // enabled and the callee has more arguments then the caller.
- NumBytes -= mergeSPUpdates(MBB, MBBI, StackPtr, true);
- // If there is an ADD32ri or SUB32ri of ESP immediately after this
- // instruction, merge the two instructions.
- mergeSPUpdatesDown(MBB, MBBI, StackPtr, &NumBytes);
-
- if (NumBytes)
- emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
+ // Save EAX
+ BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
+ .addReg(X86::EAX, RegState::Kill);
+
+ // Allocate NumBytes-4 bytes on stack. We'll also use 4 already
+ // allocated bytes for EAX.
+ BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
+ .addImm(NumBytes - 4);
+ BuildMI(MBB, MBBI, DL, TII.get(X86::CALLpcrel32))
+ .addExternalSymbol("_alloca");
+
+ // Restore EAX
+ MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),
+ X86::EAX),
+ StackPtr, false, NumBytes - 4);
+ MBB.insert(MBBI, MI);
}
+ } else if (NumBytes) {
+ // If there is an SUB32ri of ESP immediately before this instruction, merge
+ // the two. This can be the case when tail call elimination is enabled and
+ // the callee has more arguments then the caller.
+ NumBytes -= mergeSPUpdates(MBB, MBBI, StackPtr, true);
+
+ // If there is an ADD32ri or SUB32ri of ESP immediately after this
+ // instruction, merge the two instructions.
+ mergeSPUpdatesDown(MBB, MBBI, StackPtr, &NumBytes);
+
+ if (NumBytes)
+ emitSPUpdate(MBB, MBBI, StackPtr, -(int64_t)NumBytes, Is64Bit, TII);
}
- if (needsFrameMoves)
+ if (needsFrameMoves) {
+ unsigned ReadyLabelId = 0;
+ // Mark effective beginning of when frame pointer is ready.
+ ReadyLabelId = MMI->NextLabelID();
+ BuildMI(MBB, MBBI, DL, TII.get(X86::DBG_LABEL)).addImm(ReadyLabelId);
emitFrameMoves(MF, FrameLabelId, ReadyLabelId);
+ }
}
void X86RegisterInfo::emitEpilogue(MachineFunction &MF,
projects / oota-llvm.git / blobdiff