1 files changed, 38 insertions, 0 deletions
diff --git a/test/Transforms/IndVarSimplify/tripcount_infinite.ll b/test/Transforms/IndVarSimplify/tripcount_infinite.ll
new file mode 100644
index 000000000000..d5965f4ed6f0
--- /dev/null
+++ b/test/Transforms/IndVarSimplify/tripcount_infinite.ll
@@ -0,0 +1,38 @@
+; These tests have an infinite trip count.  We obviously shouldn't remove the 
+; loops!  :)
+;
+; RUN: llvm-as < %s | opt -indvars -adce -simplifycfg | llvm-dis | grep icmp | wc -l > %t2
+; RUN: llvm-as < %s | llvm-dis | grep icmp | wc -l > %t1
+; RUN: diff %t1 %t2
+
+;; test for (i = 1; i != 100; i += 2)
+define i32 @infinite_linear() {
+entry:
+        br label %loop
+
+loop:           ; preds = %loop, %entry
+        %i = phi i32 [ 1, %entry ], [ %i.next, %loop ]          ; <i32> [#uses=3]
+        %i.next = add i32 %i, 2         ; <i32> [#uses=1]
+        %c = icmp ne i32 %i, 100                ; <i1> [#uses=1]
+        br i1 %c, label %loop, label %loopexit
+
+loopexit:               ; preds = %loop
+        ret i32 %i
+}
+
+;; test for (i = 1; i*i != 63; ++i)
+define i32 @infinite_quadratic() {
+entry:
+        br label %loop
+
+loop:           ; preds = %loop, %entry
+        %i = phi i32 [ 1, %entry ], [ %i.next, %loop ]          ; <i32> [#uses=4]
+        %isquare = mul i32 %i, %i               ; <i32> [#uses=1]
+        %i.next = add i32 %i, 1         ; <i32> [#uses=1]
+        %c = icmp ne i32 %isquare, 63           ; <i1> [#uses=1]
+        br i1 %c, label %loop, label %loopexit
+
+loopexit:               ; preds = %loop
+        ret i32 %i
+}
+