Add a testcase for unrolling loops with unknown tripcounts.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37238 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/LoopUnroll/2007-05-09-UnknownTripCount.ll b/test/Transforms/LoopUnroll/2007-05-09-UnknownTripCount.ll
new file mode 100644 (file)
index 0000000..2086e96
--- /dev/null
+++ b/test/Transforms/LoopUnroll/2007-05-09-UnknownTripCount.ll
@@ -0,0 +1,18 @@
+; RUN: llvm-as < %s | opt -loop-unroll -unroll-count=3 | llvm-dis | grep bb72.2
+
+define void @foo(i32 %trips) {
+entry:
+       br label %cond_true.outer
+
+cond_true.outer:
+       %indvar1.ph = phi i32 [ 0, %entry ], [ %indvar.next2, %bb72 ]
+       br label %bb72
+
+bb72:
+       %indvar.next2 = add i32 %indvar1.ph, 1
+       %exitcond3 = icmp eq i32 %indvar.next2, %trips
+       br i1 %exitcond3, label %cond_true138, label %cond_true.outer
+
+cond_true138:
+       ret void
+}