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15 lines
391 B
LLVM
15 lines
391 B
LLVM
; RUN: opt < %s -basicaa -gvn -instcombine -S | grep {ret i32 0}
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@flag0 = internal global i32 zeroinitializer
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@turn = internal global i32 zeroinitializer
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define i32 @main() {
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%a = load i32* @flag0
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%b = tail call i32 @llvm.atomic.swap.i32.p0i32(i32* @turn, i32 1)
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%c = load i32* @flag0
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%d = sub i32 %a, %c
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ret i32 %d
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}
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declare i32 @llvm.atomic.swap.i32.p0i32(i32*, i32) nounwind |