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3ac128b6b7
I looked into adding a warning / error for this to FileCheck, but there doesn't seem to be a good way to avoid it triggering on the instances of it in RUN lines. llvm-svn: 244481
29 lines
845 B
LLVM
29 lines
845 B
LLVM
; RUN: opt -S -reassociate -die < %s | FileCheck %s
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; The two va_arg instructions depend on the memory/context, are therfore not
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; identical and the sub should not be optimized to 0 by reassociate.
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;
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; CHECK-LABEL: @func(
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; ...
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; CHECK: %v0 = va_arg i8** %varargs, i32
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; CHECK: %v1 = va_arg i8** %varargs, i32
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; CHECK: %v0.neg = sub i32 0, %v0
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; CHECK: %sub = add i32 %v0.neg, 1
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; CHECK: %add = add i32 %sub, %v1
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; ...
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; CHECK: ret i32 %add
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define i32 @func(i32 %dummy, ...) {
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%varargs = alloca i8*, align 8
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%varargs1 = bitcast i8** %varargs to i8*
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call void @llvm.va_start(i8* %varargs1)
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%v0 = va_arg i8** %varargs, i32
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%v1 = va_arg i8** %varargs, i32
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%sub = sub nsw i32 %v1, %v0
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%add = add nsw i32 %sub, 1
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call void @llvm.va_end(i8* %varargs1)
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ret i32 %add
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}
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declare void @llvm.va_start(i8*)
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declare void @llvm.va_end(i8*)
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