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Remove code that pad number of bytes to pop for X86_FastCall CC. The code doesn't do the "aligning" for Cygwin, Mingw, and Windows. But aligning it on Darwin and Linux breaks gcc compatibility. That ruled out all the platforms we support!

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55756 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-09-04 01:04:15 +00:00
parent 7794f2a3a7
commit c2feb5c262
2 changed files with 1 additions and 16 deletions
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15
lib/Target/X86/X86ISelLowering.cpp
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@ -1379,14 +1379,6 @@ X86TargetLowering::LowerFORMAL_ARGUMENTS(SDValue Op, SelectionDAG &DAG) {
}
}
// Make sure the instruction takes 8n+4 bytes to make sure the start of the
// arguments and the arguments after the retaddr has been pushed are
// aligned.
if (!Is64Bit && CC == CallingConv::X86_FastCall &&
!Subtarget->isTargetCygMing() && !Subtarget->isTargetWindows() &&
(StackSize & 7) == 0)
StackSize += 4;
ArgValues.push_back(Root);
// Some CCs need callee pop.
@ -1494,13 +1486,6 @@ SDValue X86TargetLowering::LowerCALL(SDValue Op, SelectionDAG &DAG) {
if (CC == CallingConv::Fast)
NumBytes = GetAlignedArgumentStackSize(NumBytes, DAG);
// Make sure the instruction takes 8n+4 bytes to make sure the start of the
// arguments and the arguments after the retaddr has been pushed are aligned.
if (!Is64Bit && CC == CallingConv::X86_FastCall &&
!Subtarget->isTargetCygMing() && !Subtarget->isTargetWindows() &&
(NumBytes & 7) == 0)
NumBytes += 4;
int FPDiff = 0;
if (IsTailCall) {
// Lower arguments at fp - stackoffset + fpdiff.

2
test/CodeGen/X86/fast-cc-callee-pops.ll
View File

@ -3,6 +3,6 @@
; Check that a fastcc function pops its stack variables before returning.
define x86_fastcallcc void @func(i64 %X, i64 %Y, float %G, double %Z) {
define x86_fastcallcc void @func(i64 %X, i64 %Y, float %G, double %Z) nounwind {
ret void
}