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llvm-mirror/test/Analysis/BasicAA/cas.ll
2012-04-24 09:15:38 +00:00

15 lines
328 B
LLVM

; RUN: opt < %s -basicaa -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* @flag0
%b = atomicrmw xchg i32* @turn, i32 1 monotonic
%c = load i32* @flag0
%d = sub i32 %a, %c
ret i32 %d
}