| //===-- VPlanTransforms.cpp - Utility VPlan to VPlan transforms -----------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| /// |
| /// \file |
| /// This file implements a set of utility VPlan to VPlan transformations. |
| /// |
| //===----------------------------------------------------------------------===// |
| |
| #include "VPlanTransforms.h" |
| #include "llvm/ADT/PostOrderIterator.h" |
| |
| using namespace llvm; |
| |
| void VPlanTransforms::VPInstructionsToVPRecipes( |
| Loop *OrigLoop, VPlanPtr &Plan, |
| LoopVectorizationLegality::InductionList *Inductions, |
| SmallPtrSetImpl<Instruction *> &DeadInstructions) { |
| |
| auto *TopRegion = cast<VPRegionBlock>(Plan->getEntry()); |
| ReversePostOrderTraversal<VPBlockBase *> RPOT(TopRegion->getEntry()); |
| |
| // Condition bit VPValues get deleted during transformation to VPRecipes. |
| // Create new VPValues and save away as condition bits. These will be deleted |
| // after finalizing the vector IR basic blocks. |
| for (VPBlockBase *Base : RPOT) { |
| VPBasicBlock *VPBB = Base->getEntryBasicBlock(); |
| if (auto *CondBit = VPBB->getCondBit()) { |
| auto *NCondBit = new VPValue(CondBit->getUnderlyingValue()); |
| VPBB->setCondBit(NCondBit); |
| Plan->addCBV(NCondBit); |
| } |
| } |
| for (VPBlockBase *Base : RPOT) { |
| // Do not widen instructions in pre-header and exit blocks. |
| if (Base->getNumPredecessors() == 0 || Base->getNumSuccessors() == 0) |
| continue; |
| |
| VPBasicBlock *VPBB = Base->getEntryBasicBlock(); |
| VPRecipeBase *LastRecipe = nullptr; |
| // Introduce each ingredient into VPlan. |
| for (auto I = VPBB->begin(), E = VPBB->end(); I != E;) { |
| VPRecipeBase *Ingredient = &*I++; |
| // Can only handle VPInstructions. |
| VPInstruction *VPInst = cast<VPInstruction>(Ingredient); |
| Instruction *Inst = cast<Instruction>(VPInst->getUnderlyingValue()); |
| if (DeadInstructions.count(Inst)) { |
| Ingredient->eraseFromParent(); |
| continue; |
| } |
| |
| VPRecipeBase *NewRecipe = nullptr; |
| // Create VPWidenMemoryInstructionRecipe for loads and stores. |
| if (isa<LoadInst>(Inst) || isa<StoreInst>(Inst)) |
| NewRecipe = new VPWidenMemoryInstructionRecipe( |
| *Inst, Plan->getOrAddVPValue(getLoadStorePointerOperand(Inst)), |
| nullptr /*Mask*/); |
| else if (PHINode *Phi = dyn_cast<PHINode>(Inst)) { |
| InductionDescriptor II = Inductions->lookup(Phi); |
| if (II.getKind() == InductionDescriptor::IK_IntInduction || |
| II.getKind() == InductionDescriptor::IK_FpInduction) { |
| NewRecipe = new VPWidenIntOrFpInductionRecipe(Phi); |
| } else |
| NewRecipe = new VPWidenPHIRecipe(Phi); |
| } else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Inst)) { |
| NewRecipe = new VPWidenGEPRecipe(GEP, OrigLoop); |
| } else { |
| // If the last recipe is a VPWidenRecipe, add Inst to it instead of |
| // creating a new recipe. |
| if (VPWidenRecipe *WidenRecipe = |
| dyn_cast_or_null<VPWidenRecipe>(LastRecipe)) { |
| WidenRecipe->appendInstruction(Inst); |
| Ingredient->eraseFromParent(); |
| continue; |
| } |
| NewRecipe = new VPWidenRecipe(Inst); |
| } |
| |
| NewRecipe->insertBefore(Ingredient); |
| LastRecipe = NewRecipe; |
| Ingredient->eraseFromParent(); |
| } |
| } |
| } |