blob: 754309cd81bb709b5282f25971d5927cfbff16b6 [file] [log] [blame]
; 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 = atomicrmw xchg i32* @turn, i32 1 monotonic
%c = load i32* @flag0
%d = sub i32 %a, %c
ret i32 %d
}