LSR Fix: check SCEV expression safety before expansion.
All SCEV expressions used by LSR formulae must be safe to
expand. i.e. they may not contain UDiv unless we can prove nonzero
denominator.
Fixes PR11356: LSR hoists UDiv.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160205 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 4ba969e..c0cb13d 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -2836,7 +2836,7 @@
// x == y --> x - y == 0
const SCEV *N = SE.getSCEV(NV);
- if (SE.isLoopInvariant(N, L)) {
+ if (SE.isLoopInvariant(N, L) && isSafeToExpand(N)) {
// S is normalized, so normalize N before folding it into S
// to keep the result normalized.
N = TransformForPostIncUse(Normalize, N, CI, 0,