9d7d34c769
The alignment of vector variable arguments in callee side is 4, which is aligned with MSVC. But the caller aligns them to the size of vector arguments. It results in run fails. This patch fixes this problem by trimming it to 4 bytes for variable arguments on Win32. Fixed vector arguments are passed by pointer on Win32. So they don't have the problem. I don't find a doc in MSDN for this calling conversion, so I did several experiments here: https://godbolt.org/z/n1zn1Gx1z Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D108887
37 lines
1.2 KiB
LLVM
37 lines
1.2 KiB
LLVM
; RUN: llc -mcpu=generic -mtriple=i686-pc-windows-msvc -mattr=+sse < %s | FileCheck %s --check-prefix=MSVC
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; RUN: llc -mcpu=generic -mtriple=i686-pc-mingw32 -mattr=+sse < %s | FileCheck %s --check-prefix=MINGW
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@a = external dso_local global <4 x float>, align 16
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define dso_local void @testPastArguments() nounwind {
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; MSVC-LABEL: testPastArguments:
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; MSVC: # %bb.0: # %entry
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; MSVC-NEXT: subl $20, %esp
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; MSVC-NEXT: movaps _a, %xmm0
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; MSVC-NEXT: movups %xmm0, 4(%esp)
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; MSVC-NEXT: movl $1, (%esp)
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; MSVC-NEXT: calll _testm128
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; MSVC-NEXT: addl $20, %esp
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; MSVC-NEXT: retl
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;
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; MINGW-LABEL: testPastArguments:
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; MINGW: # %bb.0: # %entry
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; MINGW-NEXT: pushl %ebp
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; MINGW-NEXT: movl %esp, %ebp
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; MINGW-NEXT: andl $-16, %esp
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; MINGW-NEXT: subl $48, %esp
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; MINGW-NEXT: movaps _a, %xmm0
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; MINGW-NEXT: movaps %xmm0, 16(%esp)
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; MINGW-NEXT: movl $1, (%esp)
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; MINGW-NEXT: calll _testm128
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; MINGW-NEXT: movl %ebp, %esp
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; MINGW-NEXT: popl %ebp
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; MINGW-NEXT: retl
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entry:
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%0 = load <4 x float>, <4 x float>* @a, align 16
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%call = tail call i32 (i32, ...) @testm128(i32 1, <4 x float> inreg %0)
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ret void
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}
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declare i32 @testm128(i32, ...) nounwind
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