73 lines
2.8 KiB
C
73 lines
2.8 KiB
C
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//===- llvm/CodeGen/GlobalISel/CombinerInfo.h ------*- 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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/// Interface for Targets to specify which operations are combined how and when.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_GLOBALISEL_COMBINER_INFO_H
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#define LLVM_CODEGEN_GLOBALISEL_COMBINER_INFO_H
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#include <cassert>
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namespace llvm {
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class GISelChangeObserver;
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class LegalizerInfo;
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class MachineInstr;
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class MachineIRBuilder;
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class MachineRegisterInfo;
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// Contains information relevant to enabling/disabling various combines for a
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// pass.
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class CombinerInfo {
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public:
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CombinerInfo(bool AllowIllegalOps, bool ShouldLegalizeIllegal,
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const LegalizerInfo *LInfo, bool OptEnabled, bool OptSize,
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bool MinSize)
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: IllegalOpsAllowed(AllowIllegalOps),
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LegalizeIllegalOps(ShouldLegalizeIllegal), LInfo(LInfo),
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EnableOpt(OptEnabled), EnableOptSize(OptSize), EnableMinSize(MinSize) {
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assert(((AllowIllegalOps || !LegalizeIllegalOps) || LInfo) &&
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"Expecting legalizerInfo when illegalops not allowed");
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}
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virtual ~CombinerInfo() = default;
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/// If \p IllegalOpsAllowed is false, the CombinerHelper will make use of
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/// the legalizerInfo to check for legality before each transformation.
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bool IllegalOpsAllowed; // TODO: Make use of this.
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/// If \p LegalizeIllegalOps is true, the Combiner will also legalize the
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/// illegal ops that are created.
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bool LegalizeIllegalOps; // TODO: Make use of this.
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const LegalizerInfo *LInfo;
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/// Whether optimizations should be enabled. This is to distinguish between
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/// uses of the combiner unconditionally and only when optimizations are
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/// specifically enabled/
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bool EnableOpt;
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/// Whether we're optimizing for size.
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bool EnableOptSize;
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/// Whether we're optimizing for minsize (-Oz).
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bool EnableMinSize;
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/// Attempt to combine instructions using MI as the root.
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///
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/// Use Observer to report the creation, modification, and erasure of
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/// instructions. GISelChangeObserver will automatically report certain
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/// kinds of operations. These operations are:
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/// * Instructions that are newly inserted into the MachineFunction
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/// * Instructions that are erased from the MachineFunction.
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///
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/// However, it is important to report instruction modification and this is
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/// not automatic.
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virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI,
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MachineIRBuilder &B) const = 0;
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};
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} // namespace llvm
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#endif
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