New testcase for bug

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2670 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SCCP/2002-05-20-MissedIncomingValue.ll b/test/Transforms/SCCP/2002-05-20-MissedIncomingValue.ll
new file mode 100644 (file)
index 0000000..ec30c67
--- /dev/null
+++ b/test/Transforms/SCCP/2002-05-20-MissedIncomingValue.ll
@@ -0,0 +1,20 @@
+; This test shows a case where SCCP is incorrectly eliminating the PHI node
+; because it thinks it has a constant 0 value, when it really doesn't.
+
+; RUN: as < %s | opt -sccp | dis | grep phi
+
+int "test"(int %A, bool %c) {
+bb1:
+       br label %BB2
+BB2:
+       %V = phi int [0, %bb1], [%A, %BB4]
+       br label %BB3
+
+BB3:
+       br bool %c, label %BB4, label %BB5
+BB4:
+       br label %BB2
+
+BB5:
+       ret int %V
+}