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Change stack probing code for MingW.

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Since gcc 4.6 the compiler uses ___chkstk_ms which has the same semantics as the
MS CRT function __chkstk. This simplifies the prologue generation a bit.

Reviewed by Rafael Espíndola. 

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@197205 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Kai Nacke
2013-12-13 05:37:05 +00:00
parent e93ec87db1
commit da44c36d64
3 changed files with 13 additions and 15 deletions
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16
lib/Target/X86/X86FrameLowering.cpp
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@@ -608,14 +608,12 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
// virtual memory manager are allocated in correct sequence.
if (NumBytes >= 4096 && STI.isOSWindows() && !STI.isTargetMacho()) {
const char *StackProbeSymbol;
bool isSPUpdateNeeded = false;
if (Is64Bit) {
if (STI.isTargetCygMing())
StackProbeSymbol = "___chkstk";
else {
if (STI.isTargetCygMing()) {
StackProbeSymbol = "___chkstk_ms";
} else {
StackProbeSymbol = "__chkstk";
isSPUpdateNeeded = true;
}
} else if (STI.isTargetCygMing())
StackProbeSymbol = "_alloca";
@@ -657,15 +655,15 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
.addReg(X86::EFLAGS, RegState::Define | RegState::Implicit)
.setMIFlag(MachineInstr::FrameSetup);
// MSVC x64's __chkstk does not adjust %rsp itself.
// It also does not clobber %rax so we can reuse it when adjusting %rsp.
if (isSPUpdateNeeded) {
if (Is64Bit) {
// MSVC x64's __chkstk and cygwin/mingw's ___chkstk_ms do not adjust %rsp
// themself. It also does not clobber %rax so we can reuse it when
// adjusting %rsp.
BuildMI(MBB, MBBI, DL, TII.get(X86::SUB64rr), StackPtr)
.addReg(StackPtr)
.addReg(X86::RAX)
.setMIFlag(MachineInstr::FrameSetup);
}
if (isEAXAlive) {
// Restore EAX
MachineInstr *MI = addRegOffset(BuildMI(MF, DL, TII.get(X86::MOV32rm),