Testcase for missed merge opportunity

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2477 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SimplifyCFG/2002-05-05-EmptyBlockMerge.ll b/test/Transforms/SimplifyCFG/2002-05-05-EmptyBlockMerge.ll
new file mode 100644 (file)
index 0000000..d4a2944
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/2002-05-05-EmptyBlockMerge.ll
@@ -0,0 +1,22 @@
+; Basic block #2 should be merged into BB #3!
+;
+; RUN: if as < %s | opt -dce | dis | grep 'br label'
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+;
+void "cprop_test12"(int* %data) {
+bb0:
+        %reg108 = load int* %data
+        %cond218 = setne int %reg108, 5
+        br bool %cond218, label %bb3, label %bb2
+
+bb2:
+        br label %bb3
+
+bb3:
+        %reg117 = phi int [ 110, %bb2 ], [ %reg108, %bb0 ]
+        store int %reg117, int* %data
+        ret void
+}
+