forked from OSchip/llvm-project
86 lines
3.2 KiB
C++
86 lines
3.2 KiB
C++
//===-- VPlanHCFGTransforms.cpp - Utility VPlan to VPlan transforms -------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
///
|
|
/// \file
|
|
/// This file implements a set of utility VPlan to VPlan transformations.
|
|
///
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "VPlanHCFGTransforms.h"
|
|
#include "llvm/ADT/PostOrderIterator.h"
|
|
|
|
using namespace llvm;
|
|
|
|
void VPlanHCFGTransforms::VPInstructionsToVPRecipes(
|
|
VPlanPtr &Plan,
|
|
LoopVectorizationLegality::InductionList *Inductions,
|
|
SmallPtrSetImpl<Instruction *> &DeadInstructions) {
|
|
|
|
VPRegionBlock *TopRegion = dyn_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, 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 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();
|
|
}
|
|
}
|
|
}
|