Add new testcase

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5701 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SimplifyCFG/PhiBlockMerge2.ll b/test/Transforms/SimplifyCFG/PhiBlockMerge2.ll
new file mode 100644 (file)
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--- /dev/null
+++ b/test/Transforms/SimplifyCFG/PhiBlockMerge2.ll
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+; Test merging of blocks that only have PHI nodes in them.  This tests the case
+; where the mergedinto block doesn't have any PHI nodes, and is in fact 
+; dominated by the block-to-be-eliminated
+;
+; RUN: if as < %s | opt -simplifycfg | dis | grep 'N:'
+; RUN: then exit 1
+; RUN: else exit 0
+; RUN: fi
+;
+
+int %test(bool %a, bool %b) {
+       br bool %b, label %N, label %Q
+Q:
+       br label %N
+N:
+       %W = phi int [0, %0], [1, %Q]
+       ; This block should be foldable into M
+       br label %M
+
+M:
+       %R = add int %W, 1
+       ret int %R
+}
+