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//===- VPlanTransforms.h - 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 provides utility VPlan to VPlan transformations.
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
#define LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
#include "VPlan.h"
#include "llvm/ADT/STLFunctionalExtras.h"
namespace llvm {
class InductionDescriptor;
class Instruction;
class PHINode;
class ScalarEvolution;
class Loop;
class PredicatedScalarEvolution;
class TargetLibraryInfo;
struct VPlanTransforms {
/// Replaces the VPInstructions in \p Plan with corresponding
/// widen recipes.
static void
VPInstructionsToVPRecipes(Loop *OrigLoop, VPlanPtr &Plan,
function_ref<const InductionDescriptor *(PHINode *)>
GetIntOrFpInductionDescriptor,
SmallPtrSetImpl<Instruction *> &DeadInstructions,
ScalarEvolution &SE, const TargetLibraryInfo &TLI);
static bool sinkScalarOperands(VPlan &Plan);
/// Merge replicate regions in their successor region, if a replicate region
/// is connected to a successor replicate region with the same predicate by a
/// single, empty VPBasicBlock.
static bool mergeReplicateRegionsIntoSuccessors(VPlan &Plan);
/// Remove redundant VPBasicBlocks by merging them into their predecessor if
/// the predecessor has a single successor.
static bool mergeBlocksIntoPredecessors(VPlan &Plan);
/// Remove redundant casts of inductions.
///
/// Such redundant casts are casts of induction variables that can be ignored,
/// because we already proved that the casted phi is equal to the uncasted phi
/// in the vectorized loop. There is no need to vectorize the cast - the same
/// value can be used for both the phi and casts in the vector loop.
static void removeRedundantInductionCasts(VPlan &Plan);
/// Try to replace VPWidenCanonicalIVRecipes with a widened canonical IV
/// recipe, if it exists.
static void removeRedundantCanonicalIVs(VPlan &Plan);
static void removeDeadRecipes(VPlan &Plan);
/// If any user of a VPWidenIntOrFpInductionRecipe needs scalar values,
/// provide them by building scalar steps off of the canonical scalar IV and
/// update the original IV's users. This is an optional optimization to reduce
/// the needs of vector extracts.
static void optimizeInductions(VPlan &Plan, ScalarEvolution &SE);
/// Remove redundant EpxandSCEVRecipes in \p Plan's entry block by replacing
/// them with already existing recipes expanding the same SCEV expression.
static void removeRedundantExpandSCEVRecipes(VPlan &Plan);
/// Optimize \p Plan based on \p BestVF and \p BestUF. This may restrict the
/// resulting plan to \p BestVF and \p BestUF.
static void optimizeForVFAndUF(VPlan &Plan, ElementCount BestVF,
unsigned BestUF,
PredicatedScalarEvolution &PSE);
};
} // namespace llvm
#endif // LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
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