[LoopStrengthReduce] Don't bother fixing up PHIs from EH Pad preds
We cannot really insert fixup code into a PHI's predecessor.
This fixes PR25445.
llvm-svn: 252416
diff --git a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index 7a7d035..9351a28 100644
--- a/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -3132,6 +3132,9 @@
PHINode::getIncomingValueNumForOperand(U.getOperandNo()));
if (!DT.dominates(L->getHeader(), UseBB))
continue;
+ // Don't bother if the instruction is in a BB which ends in an EHPad.
+ if (UseBB->getTerminator()->isEHPad())
+ continue;
// Ignore uses which are part of other SCEV expressions, to avoid
// analyzing them multiple times.
if (SE.isSCEVable(UserInst->getType())) {