new testcase for PR726

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27325 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/IndVarsSimplify/2006-03-31-NegativeStride.ll b/test/Transforms/IndVarsSimplify/2006-03-31-NegativeStride.ll
new file mode 100644 (file)
index 0000000..5401740
--- /dev/null
+++ b/test/Transforms/IndVarsSimplify/2006-03-31-NegativeStride.ll
@@ -0,0 +1,21 @@
+; RUN: llvm-as < %s | opt -indvars | llvm-dis | grep 'ret int 27'
+
+; Make sure to compute the right exit value based on negative strides.
+; PR726
+
+int %test() {
+entry:
+        br label %cond_true
+
+cond_true:              ; preds = %cond_true, %entry
+        %a.0.0 = phi int [ 10, %entry ], [ %tmp4, %cond_true ]          ; <int> [#uses=2]
+        %b.0.0 = phi int [ 0, %entry ], [ %tmp2, %cond_true ]           ; <int> [#uses=1]
+        %tmp2 = add int %b.0.0, %a.0.0          ; <int> [#uses=2]
+        %tmp4 = add int %a.0.0, -1              ; <int> [#uses=2]
+        %tmp = setgt int %tmp4, 7               ; <bool> [#uses=1]
+        br bool %tmp, label %cond_true, label %bb7
+
+bb7:            ; preds = %cond_true
+        ret int %tmp2
+}
+