diff --git a/test/Transforms/SCCP/atomic-load-store.ll b/test/Transforms/SCCP/atomic-load-store.ll new file mode 100644 index 00000000000..f4ce01930cf --- /dev/null +++ b/test/Transforms/SCCP/atomic-load-store.ll @@ -0,0 +1,30 @@ +; RUN: opt < %s -ipsccp -S | FileCheck %s + +; This transformation is safe for atomic loads and stores; check that it works. + +@G = internal global i32 17 +@C = internal constant i32 222 + +define i32 @test1() { + %V = load atomic i32* @G seq_cst, align 4 + %C = icmp eq i32 %V, 17 + br i1 %C, label %T, label %F +T: + store atomic i32 17, i32* @G seq_cst, align 4 + ret i32 %V +F: + store atomic i32 123, i32* @G seq_cst, align 4 + ret i32 0 +} +; CHECK: define i32 @test1 +; CHECK-NOT: store +; CHECK: ret i32 17 + +define i32 @test2() { + %V = load atomic i32* @C seq_cst, align 4 + ret i32 %V +} + +; CHECK: define i32 @test2 +; CHECK-NOT: load +; CHECK: ret i32 222 \ No newline at end of file