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[LV] Ensure WidenCanonicalIVRecipe is always created in header (NFC). 

The VPWidenCanonicalIVRecipe must always be created in the phi section
of the header block. Use that block as insert point.
This commit is contained in:
Florian Hahn 2021-12-21 15:13:18 +00:00
parent 8dbc7745e5
commit 1a54889f48
No known key found for this signature in database
GPG Key ID: EEF712BB5E80EBBA
1 changed files with 8 additions and 6 deletions
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14
llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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@ -8446,11 +8446,6 @@ VPValue *VPRecipeBuilder::createBlockInMask(BasicBlock *BB, VPlanPtr &Plan) {
if (!CM.blockNeedsPredicationForAnyReason(BB))
return BlockMaskCache[BB] = BlockMask; // Loop incoming mask is all-one.
// Create the block in mask as the first non-phi instruction in the block.
VPBuilder::InsertPointGuard Guard(Builder);
auto NewInsertionPoint = Builder.getInsertBlock()->getFirstNonPhi();
Builder.setInsertPoint(Builder.getInsertBlock(), NewInsertionPoint);
// Introduce the early-exit compare IV <= BTC to form header block mask.
// This is used instead of IV < TC because TC may wrap, unlike BTC.
// Start by constructing the desired canonical IV.
@ -8458,10 +8453,17 @@ VPValue *VPRecipeBuilder::createBlockInMask(BasicBlock *BB, VPlanPtr &Plan) {
if (Legal->getPrimaryInduction())
IV = Plan->getOrAddVPValue(Legal->getPrimaryInduction());
else {
VPBasicBlock *HeaderVPBB = Plan->getEntry()->getEntryBasicBlock();
auto *IVRecipe = new VPWidenCanonicalIVRecipe();
Builder.getInsertBlock()->insert(IVRecipe, NewInsertionPoint);
HeaderVPBB->insert(IVRecipe, HeaderVPBB->getFirstNonPhi());
IV = IVRecipe;
}
// Create the block in mask as the first non-phi instruction in the block.
VPBuilder::InsertPointGuard Guard(Builder);
auto NewInsertionPoint = Builder.getInsertBlock()->getFirstNonPhi();
Builder.setInsertPoint(Builder.getInsertBlock(), NewInsertionPoint);
VPValue *BTC = Plan->getOrCreateBackedgeTakenCount();
bool TailFolded = !CM.isScalarEpilogueAllowed();