Add tests for the transformations SCCP can do on atomic loads and stores (which are...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@138902 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SCCP/atomic-load-store.ll b/test/Transforms/SCCP/atomic-load-store.ll
new file mode 100644 (file)
index 0000000..f4ce019
--- /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