Add a testcase for PR4569, which is now fixed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76526 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Analysis/ScalarEvolution/zext-wrap.ll b/test/Analysis/ScalarEvolution/zext-wrap.ll
new file mode 100644 (file)
index 0000000..052d036
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/zext-wrap.ll
@@ -0,0 +1,24 @@
+; RUN: llvm-as < %s | opt -analyze -scalar-evolution -disable-output \
+; RUN:  | FileCheck %s
+; PR4569
+
+define i16 @main() nounwind {
+entry:
+        br label %bb.i
+
+bb.i:           ; preds = %bb1.i, %bb.nph
+        %l_95.0.i1 = phi i8 [ %tmp1, %bb.i ], [ 0, %entry ]
+
+; This cast shouldn't be folded into the addrec.
+; CHECK: %tmp = zext i8 %l_95.0.i1 to i16
+; CHECK: -->  (zext i8 {0,+,-1}<bb.i> to i16)    Exits: 2
+
+        %tmp = zext i8 %l_95.0.i1 to i16
+
+        %tmp1 = add i8 %l_95.0.i1, -1
+        %phitmp = icmp eq i8 %tmp1, 1
+        br i1 %phitmp, label %bb1.i.func_36.exit_crit_edge, label %bb.i
+
+bb1.i.func_36.exit_crit_edge:
+        ret i16 %tmp
+}