1 files changed, 30 insertions, 0 deletions
diff --git a/test/Analysis/ScalarEvolution/2007-08-06-Unsigned.ll b/test/Analysis/ScalarEvolution/2007-08-06-Unsigned.ll
new file mode 100644
index 000000000000..34d97664ccb6
--- /dev/null
+++ b/test/Analysis/ScalarEvolution/2007-08-06-Unsigned.ll
@@ -0,0 +1,30 @@
+; RUN: llvm-as < %s | opt -scalar-evolution -analyze | grep {Loop bb: backedge-taken count is (-1 + (-1 \\* %x) + %y)}
+; PR1597
+
+define i32 @f(i32 %x, i32 %y) {
+entry:
+        %tmp63 = icmp ult i32 %x, %y            ; <i1> [#uses=1]
+        br i1 %tmp63, label %bb.preheader, label %bb8
+
+bb.preheader:           ; preds = %entry
+        br label %bb
+
+bb:             ; preds = %bb3, %bb.preheader
+        %x_addr.0 = phi i32 [ %tmp2, %bb3 ], [ %x, %bb.preheader ]              ; <i32> [#uses=1]
+        %tmp2 = add i32 %x_addr.0, 1            ; <i32> [#uses=3]
+        br label %bb3
+
+bb3:            ; preds = %bb
+        %tmp6 = icmp ult i32 %tmp2, %y          ; <i1> [#uses=1]
+        br i1 %tmp6, label %bb, label %bb8.loopexit
+
+bb8.loopexit:           ; preds = %bb3
+        br label %bb8
+
+bb8:            ; preds = %bb8.loopexit, %entry
+        %x_addr.1 = phi i32 [ %x, %entry ], [ %tmp2, %bb8.loopexit ]            ; <i32> [#uses=1]
+        br label %return
+
+return:         ; preds = %bb8
+        ret i32 %x_addr.1
+}