blob: ad1a87c6e931bea2a0bf7a24e0989ab4a0ca31f9 [file] [log] [blame]
; RUN: opt < %s -basic-aa -gvn -instcombine -S | FileCheck %s
@flag0 = internal global i32 zeroinitializer
@turn = internal global i32 zeroinitializer
; CHECK: ret i32 0
define i32 @main() {
%a = load i32, i32* @flag0
%b = atomicrmw xchg i32* @turn, i32 1 monotonic
%c = load i32, i32* @flag0
%d = sub i32 %a, %c
ret i32 %d
}