505ad03c7d
This patch simplifies handling of redundant induction casts, by
removing dead cast instructions after initial VPlan construction.
This has the following benefits:
1. fixes a crash
(see @test_optimized_cast_induction_feeding_first_order_recurrence)
2. Simplifies VPWidenIntOrFpInduction to a single-def recipes
3. Retires recordVectorLoopValueForInductionCast.
Reviewed By: Ayal
Differential Revision: https://reviews.llvm.org/D115112
53 lines
1.9 KiB
C++
53 lines
1.9 KiB
C++
//===- VPlanTransforms.h - Utility VPlan to VPlan transforms --------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file provides utility VPlan to VPlan transformations.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
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#define LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
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#include "VPlan.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/Transforms/Vectorize/LoopVectorizationLegality.h"
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namespace llvm {
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class InductionDescriptor;
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class Instruction;
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class PHINode;
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class ScalarEvolution;
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struct VPlanTransforms {
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/// Replaces the VPInstructions in \p Plan with corresponding
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/// widen recipes.
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static void
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VPInstructionsToVPRecipes(Loop *OrigLoop, VPlanPtr &Plan,
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function_ref<const InductionDescriptor *(PHINode *)>
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GetIntOrFpInductionDescriptor,
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SmallPtrSetImpl<Instruction *> &DeadInstructions,
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ScalarEvolution &SE);
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static bool sinkScalarOperands(VPlan &Plan);
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static bool mergeReplicateRegions(VPlan &Plan);
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/// Remove redundant casts of inductions.
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///
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/// Such redundant casts are casts of induction variables that can be ignored,
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/// because we already proved that the casted phi is equal to the uncasted phi
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/// in the vectorized loop. There is no need to vectorize the cast - the same
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/// value can be used for both the phi and casts in the vector loop.
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static void removeRedundantInductionCasts(VPlan &Plan);
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};
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} // namespace llvm
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#endif // LLVM_TRANSFORMS_VECTORIZE_VPLANTRANSFORMS_H
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