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//===-- VPlanPredicator.h ---------------------------------------*- C++ -*-===//
//
// 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 defines the VPlanPredicator class which contains the public
/// interfaces to predicate and linearize the VPlan region.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_VECTORIZE_VPLAN_PREDICATOR_H
#define LLVM_TRANSFORMS_VECTORIZE_VPLAN_PREDICATOR_H
#include "LoopVectorizationPlanner.h"
#include "VPlan.h"
#include "VPlanDominatorTree.h"
namespace llvm {
class VPlanPredicator {
private:
enum class EdgeType {
TRUE_EDGE,
FALSE_EDGE,
};
// VPlan being predicated.
VPlan &Plan;
// VPLoopInfo for Plan's HCFG.
VPLoopInfo *VPLI;
// Dominator tree for Plan's HCFG.
VPDominatorTree VPDomTree;
// VPlan builder used to generate VPInstructions for block predicates.
VPBuilder Builder;
/// Get the type of edge from \p FromBlock to \p ToBlock. Returns TRUE_EDGE if
/// \p ToBlock is either the unconditional successor or the conditional true
/// successor of \p FromBlock and FALSE_EDGE otherwise.
EdgeType getEdgeTypeBetween(VPBlockBase *FromBlock, VPBlockBase *ToBlock);
/// Create and return VPValue corresponding to the predicate for the edge from
/// \p PredBB to \p CurrentBlock.
VPValue *getOrCreateNotPredicate(VPBasicBlock *PredBB, VPBasicBlock *CurrBB);
/// Generate and return the result of ORing all the predicate VPValues in \p
/// Worklist.
VPValue *genPredicateTree(std::list<VPValue *> &Worklist);
/// Create or propagate predicate for \p CurrBlock in region \p Region using
/// predicate(s) of its predecessor(s)
void createOrPropagatePredicates(VPBlockBase *CurrBlock,
VPRegionBlock *Region);
/// Predicate the CFG within \p Region.
void predicateRegionRec(VPRegionBlock *Region);
/// Linearize the CFG within \p Region.
void linearizeRegionRec(VPRegionBlock *Region);
public:
VPlanPredicator(VPlan &Plan);
/// Predicate Plan's HCFG.
void predicate(void);
};
} // end namespace llvm
#endif // LLVM_TRANSFORMS_VECTORIZE_VPLAN_PREDICATOR_H
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