1 files changed, 29 insertions, 0 deletions
diff --git a/test/Analysis/BasicAA/invariant_load.ll b/test/Analysis/BasicAA/invariant_load.ll
new file mode 100644
index 0000000000000..cd6ddb92d2103
--- /dev/null
+++ b/test/Analysis/BasicAA/invariant_load.ll
@@ -0,0 +1,29 @@
+; RUN: opt < %s -basicaa -gvn -S | FileCheck %s
+
+; The input *.ll is obtained by manually annotating "invariant.load" to the 
+; two loads. With "invariant.load" metadata, the second load is redundant.
+;
+; int foo(int *p, char *q) {
+;     *q = (char)*p;
+;     return *p + 1;
+; }
+
+define i32 @foo(i32* nocapture %p, i8* nocapture %q) {
+entry:
+  %0 = load i32* %p, align 4, !tbaa !0, !invariant.load !3
+  %conv = trunc i32 %0 to i8
+  store i8 %conv, i8* %q, align 1, !tbaa !1
+  %1 = load i32* %p, align 4, !tbaa !0, !invariant.load !3
+  %add = add nsw i32 %1, 1
+  ret i32 %add
+
+; CHECK: foo
+; CHECK: %0 = load i32* %p
+; CHECK: store i8 %conv, i8* %q,
+; CHECK: %add = add nsw i32 %0, 1
+}
+
+!0 = metadata !{metadata !"int", metadata !1}
+!1 = metadata !{metadata !"omnipotent char", metadata !2}
+!2 = metadata !{metadata !"Simple C/C++ TBAA"}
+!3 = metadata !{}