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