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Target/X86: Never use the redzone for Win64 ABI functions.

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Summary:
Until now, we did this (among other things) based on whether or not the
target was Windows. This is clearly wrong, not just for Win64 ABI functions
on non-Windows, but for System V ABI functions on Windows, too. In this
change, we make this decision based on the ABI the calling convention
specifies instead.

Reviewers: rnk

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D7953

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230793 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Charles Davis 2015-02-27 21:11:16 +00:00
parent e03aac601f
commit dc64962c86
2 changed files with 3 additions and 2 deletions
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2
lib/Target/X86/X86FrameLowering.cpp
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@ -581,7 +581,7 @@ void X86FrameLowering::emitPrologue(MachineFunction &MF) const {
bool Is64Bit = STI.is64Bit();
// standard x86_64 and NaCl use 64-bit frame/stack pointers, x32 - 32-bit.
const bool Uses64BitFramePtr = STI.isTarget64BitLP64() || STI.isTargetNaCl64();
bool IsWin64 = STI.isTargetWin64();
bool IsWin64 = STI.isCallingConvWin64(Fn->getCallingConv());
// Not necessarily synonymous with IsWin64.
bool IsWinEH = MF.getTarget().getMCAsmInfo()->usesWindowsCFI();
bool NeedsWinEH = IsWinEH && Fn->needsUnwindTableEntry();

3
test/CodeGen/X86/2009-06-03-Win64DisableRedZone.ll
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@ -1,7 +1,8 @@
; RUN: llc -mtriple=x86_64-mingw32 < %s | FileCheck %s
; RUN: llc -mtriple=x86_64-linux < %s | FileCheck %s
; CHECK-NOT: -{{[1-9][0-9]*}}(%rsp)
define x86_fp80 @a(i64 %x) nounwind readnone {
define x86_64_win64cc x86_fp80 @a(i64 %x) nounwind readnone {
entry:
%conv = sitofp i64 %x to x86_fp80 ; <x86_fp80> [#uses=1]
ret x86_fp80 %conv