New testcase for feature simplifycfg should handle

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5698 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SimplifyCFG/EqualPHIEdgeBlockMerge.ll b/test/Transforms/SimplifyCFG/EqualPHIEdgeBlockMerge.ll
new file mode 100644 (file)
index 0000000..b090e78
--- /dev/null
+++ b/test/Transforms/SimplifyCFG/EqualPHIEdgeBlockMerge.ll
@@ -0,0 +1,21 @@
+; Test merging of blocks with phi nodes.
+;
+; RUN: if as < %s | opt -simplifycfg | dis | grep 'N:'
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+;
+
+int %test(bool %a) {
+Q:
+       br bool %a, label %N, label %M
+N:
+       br label %M
+M:
+       ; It's ok to merge N and M because the incoming values for W are the 
+        ; same for both cases...
+       %W = phi int [2, %N], [2, %Q]
+       %R = add int %W, 1
+       ret int %R
+}
+