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36d0cb3fd9
This matches GCC and MSVC's behaviour, and saves on code size. We were already not extending i1 return values on x86_64 after r127766. This takes that patch further by applying it to x86 target as well, and also for i8 and i16. The ABI docs have been unclear about the required behaviour here. The new i386 psABI [1] clearly states (Table 2.4, page 14) that i1, i8, and i16 return vales do not need to be extended beyond 8 bits. The x86_64 ABI doc is being updated to say the same [2]. Differential Revision: http://reviews.llvm.org/D16907 [1]. https://01.org/sites/default/files/file_attach/intel386-psabi-1.0.pdf [2]. https://groups.google.com/d/msg/x86-64-abi/E8O33onbnGQ/_RFWw_ixDQAJ llvm-svn: 260133
57 lines
1.3 KiB
LLVM
57 lines
1.3 KiB
LLVM
; RUN: llc < %s -mtriple=i686-unknown-linux-gnu | FileCheck %s -check-prefix=X86
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; RUN: llc < %s -mtriple=x86_64-apple-darwin10 | FileCheck %s -check-prefix=X64
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; RUN: llc < %s -mtriple=x86_64-pc-win32 | FileCheck %s -check-prefix=WIN64
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; Check that the argument gets zero-extended before calling.
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; X86-LABEL: bar1
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; X86: movzbl
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; X86: calll
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; X64-LABEL: bar1
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; X64: movzbl
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; X64: jmp
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; WIN64-LABEL: bar1
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; WIN64: movzbl
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; WIN64: callq
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define void @bar1(i1 zeroext %v1) nounwind ssp {
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entry:
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%conv = zext i1 %v1 to i32
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%call = tail call i32 (...) @foo1(i32 %conv) nounwind
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ret void
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}
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; Check that on x86-64 the arguments are simply forwarded.
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; X64-LABEL: bar2
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; X64-NOT: movzbl
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; X64: jmp
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; WIN64-LABEL: bar2
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; WIN64-NOT: movzbl
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; WIN64: callq
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define void @bar2(i8 zeroext %v1) nounwind ssp {
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entry:
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%conv = zext i8 %v1 to i32
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%call = tail call i32 (...) @foo1(i32 %conv) nounwind
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ret void
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}
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; Check that i1 return values are not zero-extended.
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; X86-LABEL: bar3
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; X86: call
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; X86-NEXT: {{add|pop}}
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; X86-NEXT: ret
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; X64-LABEL: bar3
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; X64: call
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; X64-NEXT: {{add|pop}}
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; X64-NEXT: ret
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; WIN64-LABEL: bar3
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; WIN64: call
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; WIN64-NEXT: {{add|pop}}
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; WIN64-NEXT: ret
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define zeroext i1 @bar3() nounwind ssp {
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entry:
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%call = call i1 @foo2() nounwind
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ret i1 %call
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}
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declare i32 @foo1(...)
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declare zeroext i1 @foo2()
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