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Mark instructions which are part of the frame setup with the MachineInstr::FrameSetup flag.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135645 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling 2011-07-21 00:44:56 +00:00
parent 37eb38d3f8
commit fb4eb165d6
1 changed files with 20 additions and 9 deletions

29
lib/Target/X86/X86FrameLowering.cpp

@ -458,7 +458,8 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
if (needsFrameMoves) {
// Mark the place where EBP/RBP was saved.
MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL)).addSym(FrameLabel);
BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL))
.addSym(FrameLabel);
// Define the current CFA rule to use the provided offset.
if (StackSize) {
@ -486,7 +487,8 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
if (needsFrameMoves) {
// Mark effective beginning of when frame pointer becomes valid.
MCSymbol *FrameLabel = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL)).addSym(FrameLabel);
BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL))
.addSym(FrameLabel);
// Define the current CFA to use the EBP/RBP register.
MachineLocation FPDst(FramePtr);
@ -503,8 +505,10 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
if (RegInfo->needsStackRealignment(MF)) {
MachineInstr *MI =
BuildMI(MBB, MBBI, DL,
TII.get(Is64Bit ? X86::AND64ri32 : X86::AND32ri),
StackPtr).addReg(StackPtr).addImm(-MaxAlign);
TII.get(Is64Bit ? X86::AND64ri32 : X86::AND32ri), StackPtr)
.addReg(StackPtr)
.addImm(-MaxAlign)
.setMIFlag(MachineInstr::FrameSetup);
// The EFLAGS implicit def is dead.
MI->getOperand(3).setIsDead();
@ -521,6 +525,7 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
(MBBI->getOpcode() == X86::PUSH32r ||
MBBI->getOpcode() == X86::PUSH64r)) {
PushedRegs = true;
MBBI->setFlag(MachineInstr::FrameSetup);
++MBBI;
if (!HasFP && needsFrameMoves) {
@ -585,26 +590,30 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
// Save EAX
BuildMI(MBB, MBBI, DL, TII.get(X86::PUSH32r))
.addReg(X86::EAX, RegState::Kill);
.addReg(X86::EAX, RegState::Kill)
.setMIFlag(MachineInstr::FrameSetup);
}
if (Is64Bit) {
// Handle the 64-bit Windows ABI case where we need to call __chkstk.
// Function prologue is responsible for adjusting the stack pointer.
BuildMI(MBB, MBBI, DL, TII.get(X86::MOV64ri), X86::RAX)
.addImm(NumBytes);
.addImm(NumBytes)
.setMIFlag(MachineInstr::FrameSetup);
} else {
// Allocate NumBytes-4 bytes on stack in case of isEAXAlive.
// We'll also use 4 already allocated bytes for EAX.
BuildMI(MBB, MBBI, DL, TII.get(X86::MOV32ri), X86::EAX)
.addImm(isEAXAlive ? NumBytes - 4 : NumBytes);
.addImm(isEAXAlive ? NumBytes - 4 : NumBytes)
.setMIFlag(MachineInstr::FrameSetup);
}
BuildMI(MBB, MBBI, DL,
TII.get(Is64Bit ? X86::W64ALLOCA : X86::CALLpcrel32))
.addExternalSymbol(StackProbeSymbol)
.addReg(StackPtr, RegState::Define | RegState::Implicit)
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit);
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit)
.setMIFlag(MachineInstr::FrameSetup);
// MSVC x64's __chkstk needs to adjust %rsp.
// FIXME: %rax preserves the offset and should be available.
@ -617,6 +626,7 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),
X86::EAX),
StackPtr, false, NumBytes - 4);
MI->setFlag(MachineInstr::FrameSetup);
MBB.insert(MBBI, MI);
}
} else if (NumBytes)
@ -626,7 +636,8 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
if (( (!HasFP && NumBytes) || PushedRegs) && needsFrameMoves) {
// Mark end of stack pointer adjustment.
MCSymbol *Label = MMI.getContext().CreateTempSymbol();
BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL)).addSym(Label);
BuildMI(MBB, MBBI, DL, TII.get(X86::PROLOG_LABEL))
.addSym(Label);
if (!HasFP && NumBytes) {
// Define the current CFA rule to use the provided offset.