Use a SCEV expression cast instead of immediately inserting a
new instruction with SCEVExpander::InsertCastOfTo.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69290 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
index a542ca0..74b0d5a 100644
--- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp
+++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp
@@ -1836,17 +1836,17 @@
if (L->contains(User.Inst->getParent()))
User.Inst->moveBefore(LatchBlock->getTerminator());
}
- if (RewriteOp->getType() != ReplacedTy) {
- Instruction::CastOps opcode =
- CastInst::getCastOpcode(RewriteOp, false, ReplacedTy, false);
- assert(opcode != Instruction::SExt &&
- opcode != Instruction::ZExt &&
- "Unexpected widening cast!");
- RewriteOp = SCEVExpander::InsertCastOfTo(opcode, RewriteOp, ReplacedTy);
- }
SCEVHandle RewriteExpr = SE->getUnknown(RewriteOp);
+ if (TD->getTypeSizeInBits(RewriteOp->getType()) !=
+ TD->getTypeSizeInBits(ReplacedTy)) {
+ assert(TD->getTypeSizeInBits(RewriteOp->getType()) >
+ TD->getTypeSizeInBits(ReplacedTy) &&
+ "Unexpected widening cast!");
+ RewriteExpr = SE->getTruncateExpr(RewriteExpr, ReplacedTy);
+ }
+
// If we had to insert new instructions for RewriteOp, we have to
// consider that they may not have been able to end up immediately
// next to RewriteOp, because non-PHI instructions may never precede