Regression is gone, don't try to find it on clean target.

llvm-svn: 33296

1 files changed, 34 insertions, 0 deletions

diff --git a/llvm/test/Transforms/SCCP/sccptest.ll b/llvm/test/Transforms/SCCP/sccptest.ll
new file mode 100644
index 00000000000..6fae7ce957d
--- /dev/null
+++ b/llvm/test/Transforms/SCCP/sccptest.ll
@@ -0,0 +1,34 @@
+; This is the test case taken from appel's book that illustrates a hard case
+; that SCCP gets right. BB3 should be completely eliminated.
+;
+; RUN: llvm-upgrade < %s | llvm-as | opt -sccp -constprop -dce -cfgsimplify | llvm-dis | not grep BB3
+
+int %testfunction(int %i0, int %j0) {
+BB1:
+	br label %BB2
+BB2:
+	%j2 = phi int [%j4, %BB7], [1, %BB1]
+	%k2 = phi int [%k4, %BB7], [0, %BB1]
+	%kcond = setlt int %k2, 100
+	br bool %kcond, label %BB3, label %BB4
+
+BB3:
+	%jcond = setlt int %j2, 20
+	br bool %jcond, label %BB5, label %BB6
+
+BB4:
+	ret int %j2
+
+BB5:
+	%k3 = add int %k2, 1
+	br label %BB7
+
+BB6:
+	%k5 = add int %k2, 1
+	br label %BB7
+
+BB7:
+	%j4 = phi int [1, %BB5], [%k2, %BB6]
+	%k4 = phi int [%k3, %BB5], [%k5, %BB6]
+	br label %BB2
+}