[LoopUnroll] Peel off iterations if it makes conditions true/false.

If the loop body contains conditions of the form IndVar < #constant, we
can remove the checks by peeling off #constant iterations.

This improves codegen for PR34364.

Reviewers: mkuper, mkazantsev, efriedma

Reviewed By: mkazantsev

Differential Revision: https://reviews.llvm.org/D43876

llvm-svn: 327671

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
index 68d86d99382..093f3407bde 100644
--- a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -795,7 +795,7 @@ static bool computeUnrollCount(
   }
 
   // 4th priority is loop peeling
-  computePeelCount(L, LoopSize, UP, TripCount);
+  computePeelCount(L, LoopSize, UP, TripCount, SE);
   if (UP.PeelCount) {
     UP.Runtime = false;
     UP.Count = 1;