Avoid a confusing assert for silly options: -unroll-runtime -unroll-count=1.
No need for an explicit test case for an unsupported combination of options.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@146721 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/LoopUnroll.cpp b/lib/Transforms/Utils/LoopUnroll.cpp
index b96f14b..512b689 100644
--- a/lib/Transforms/Utils/LoopUnroll.cpp
+++ b/lib/Transforms/Utils/LoopUnroll.cpp
@@ -176,6 +176,11 @@
if (TripCount != 0 && Count > TripCount)
Count = TripCount;
+ // Don't enter the unroll code if there is nothing to do. This way we don't
+ // need to support "partial unrolling by 1".
+ if (TripCount == 0 && Count < 2)
+ return false;
+
assert(Count > 0);
assert(TripMultiple > 0);
assert(TripCount == 0 || TripCount % TripMultiple == 0);