1 files changed, 23 insertions, 0 deletions
diff --git a/test/Transforms/SimplifyCFG/PhiBlockMerge.ll b/test/Transforms/SimplifyCFG/PhiBlockMerge.ll
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+++ b/test/Transforms/SimplifyCFG/PhiBlockMerge.ll
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+; Test merging of blocks that only have PHI nodes in them
+;
+; RUN: llvm-upgrade < %s | llvm-as | opt -simplifycfg | llvm-dis | not grep N:
+;
+
+int %test(bool %a, bool %b) {
+        br bool %a, label %M, label %O
+
+O:
+	br bool %b, label %N, label %Q
+Q:
+	br label %N
+N:
+	%Wp = phi int [0, %O], [1, %Q]
+	; This block should be foldable into M
+	br label %M
+
+M:
+	%W = phi int [%Wp, %N], [2, %0]
+	%R = add int %W, 1
+	ret int %R
+}
+