New testcase that used to cause the unroller to try to unroll the loop 2G times. :(

llvm-svn: 13563

1 files changed, 15 insertions, 0 deletions

diff --git a/llvm/test/Regression/Transforms/LoopUnroll/2004-05-13-DontUnrollTooMuch.ll b/llvm/test/Regression/Transforms/LoopUnroll/2004-05-13-DontUnrollTooMuch.ll
new file mode 100644
index 00000000000..6edf2812836
--- /dev/null
+++ b/llvm/test/Regression/Transforms/LoopUnroll/2004-05-13-DontUnrollTooMuch.ll
@@ -0,0 +1,15 @@
+; RUN: llvm-as < %s | opt -loop-unroll -disable-output
+
+int %main() {
+entry:
+        br label %no_exit
+
+no_exit:                ; preds = %entry, %no_exit
+        %indvar = phi uint [ 0, %entry ], [ %indvar.next, %no_exit ]            ; <uint> [#uses=1]
+        %indvar.next = add uint %indvar, 1              ; <uint> [#uses=2]
+        %exitcond = setne uint %indvar.next, 2147483648         ; <bool> [#uses=1]
+        br bool %exitcond, label %no_exit, label %loopexit
+
+loopexit:               ; preds = %no_exit
+        ret int 0
+}