Add test for PR1996. (This is my first time adding a test for a

transform, so please review.)

llvm-svn: 47050

1 files changed, 19 insertions, 0 deletions

diff --git a/llvm/test/Transforms/GVN/2008-02-12UndefLoad.ll b/llvm/test/Transforms/GVN/2008-02-12UndefLoad.ll
new file mode 100644
index 00000000000..ddc10e1dc0f
--- /dev/null
+++ b/llvm/test/Transforms/GVN/2008-02-12UndefLoad.ll
@@ -0,0 +1,19 @@
+; RUN: llvm-as < %s | opt -gvn | llvm-dis | not grep load
+
+%struct.anon = type { i32, i8, i8, i8, i8 }
+
+define i32 @a() {
+entry:
+        %c = alloca %struct.anon                ; <%struct.anon*> [#uses=2]
+        %tmp = getelementptr %struct.anon* %c, i32 0, i32 0             ; <i32*> [#uses=1]
+        %tmp1 = getelementptr i32* %tmp, i32 1          ; <i32*> [#uses=2]
+        %tmp2 = load i32* %tmp1, align 4                ; <i32> [#uses=1]
+        %tmp3 = or i32 %tmp2, 11                ; <i32> [#uses=1]
+        %tmp4 = and i32 %tmp3, -21              ; <i32> [#uses=1]
+        store i32 %tmp4, i32* %tmp1, align 4
+        %call = call i32 (...)* @x( %struct.anon* %c )          ; <i32> [#uses=0]
+        ret i32 undef
+}
+
+
+declare i32 @x(...)