56 lines
2.4 KiB
C++
56 lines
2.4 KiB
C++
//===- llvm/Transforms/Utils/LoopPeel.h ----- Peeling utilities -*- C++ -*-===//
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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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// This file defines some loop peeling utilities. It does not define any
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// actual pass or policy.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_LOOPPEEL_H
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#define LLVM_TRANSFORMS_UTILS_LOOPPEEL_H
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/Transforms/Utils/ValueMapper.h"
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namespace llvm {
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LLVM_ABI bool canPeel(const Loop *L);
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/// Returns true if the last iteration of \p L can be peeled off. It makes sure
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/// the loop exit condition can be adjusted when peeling and that the loop
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/// executes at least 2 iterations.
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LLVM_ABI bool canPeelLastIteration(const Loop &L, ScalarEvolution &SE);
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/// VMap is the value-map that maps instructions from the original loop to
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/// instructions in the last peeled-off iteration. If \p PeelLast is true, peel
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/// off the last \p PeelCount iterations from \p L (canPeelLastIteration must be
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/// true for \p L), otherwise peel off the first \p PeelCount iterations.
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LLVM_ABI void peelLoop(Loop *L, unsigned PeelCount, bool PeelLast, LoopInfo *LI,
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ScalarEvolution *SE, DominatorTree &DT,
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AssumptionCache *AC, bool PreserveLCSSA,
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ValueToValueMapTy &VMap);
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LLVM_ABI TargetTransformInfo::PeelingPreferences
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gatherPeelingPreferences(Loop *L, ScalarEvolution &SE,
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const TargetTransformInfo &TTI,
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std::optional<bool> UserAllowPeeling,
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std::optional<bool> UserAllowProfileBasedPeeling,
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bool UnrollingSpecficValues = false);
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LLVM_ABI void computePeelCount(Loop *L, unsigned LoopSize,
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TargetTransformInfo::PeelingPreferences &PP,
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unsigned TripCount, DominatorTree &DT,
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ScalarEvolution &SE,
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const TargetTransformInfo &TTI,
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AssumptionCache *AC = nullptr,
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unsigned Threshold = UINT_MAX);
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} // end namespace llvm
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#endif // LLVM_TRANSFORMS_UTILS_LOOPPEEL_H
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