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Target/X86: Tweak va_arg for Win64 not to miss taking va_start when number of fixed args > 4.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127328 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2011-03-09 11:33:15 +00:00
parent 6716b8ec9d
commit 3ca99435e9
2 changed files with 38 additions and 3 deletions
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8
lib/Target/X86/X86ISelLowering.cpp
View File

@ -1744,8 +1744,8 @@ X86TargetLowering::LowerFormalArguments(SDValue Chain,
// If the function takes variable number of arguments, make a frame index for
// the start of the first vararg value... for expansion of llvm.va_start.
if (isVarArg) {
if (!IsWin64 && (Is64Bit || (CallConv != CallingConv::X86_FastCall &&
CallConv != CallingConv::X86_ThisCall))) {
if (Is64Bit || (CallConv != CallingConv::X86_FastCall &&
CallConv != CallingConv::X86_ThisCall)) {
FuncInfo->setVarArgsFrameIndex(MFI->CreateFixedObject(1, StackSize,true));
}
if (Is64Bit) {
@ -1797,7 +1797,9 @@ X86TargetLowering::LowerFormalArguments(SDValue Chain,
int HomeOffset = TFI.getOffsetOfLocalArea() + 8;
FuncInfo->setRegSaveFrameIndex(
MFI->CreateFixedObject(1, NumIntRegs * 8 + HomeOffset, false));
FuncInfo->setVarArgsFrameIndex(FuncInfo->getRegSaveFrameIndex());
// Fixup to set vararg frame on shadow area (4 x i64).
if (NumIntRegs < 4)
FuncInfo->setVarArgsFrameIndex(FuncInfo->getRegSaveFrameIndex());
} else {
// For X86-64, if there are vararg parameters that are passed via
// registers, then we must store them to their spots on the stack so they

33
test/CodeGen/X86/win64_vararg.ll
View File

@ -18,3 +18,36 @@ entry:
}
declare void @llvm.va_start(i8*) nounwind
; CHECK: f5:
; CHECK: pushq
; CHECK: leaq 56(%rsp),
define i8* @f5(i64 %a0, i64 %a1, i64 %a2, i64 %a3, i64 %a4, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
ret i8* %ap1
}
; CHECK: f4:
; CHECK: pushq
; CHECK: leaq 48(%rsp),
define i8* @f4(i64 %a0, i64 %a1, i64 %a2, i64 %a3, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
ret i8* %ap1
}
; CHECK: f3:
; CHECK: pushq
; CHECK: leaq 40(%rsp),
define i8* @f3(i64 %a0, i64 %a1, i64 %a2, ...) nounwind {
entry:
%ap = alloca i8*, align 8
%ap1 = bitcast i8** %ap to i8*
call void @llvm.va_start(i8* %ap1)
ret i8* %ap1
}