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| 14 | pmbaty | 1 | //===- llvm/CodeGen/GlobalISel/CombinerInfo.h ------*- C++ -*-===// |
| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | /// \file |
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| 9 | /// Interface for Targets to specify which operations are combined how and when. |
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| 10 | /// |
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| 11 | //===----------------------------------------------------------------------===// |
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| 12 | |||
| 13 | #ifndef LLVM_CODEGEN_GLOBALISEL_COMBINERINFO_H |
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| 14 | #define LLVM_CODEGEN_GLOBALISEL_COMBINERINFO_H |
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| 15 | |||
| 16 | #include <cassert> |
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| 17 | namespace llvm { |
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| 18 | |||
| 19 | class GISelChangeObserver; |
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| 20 | class LegalizerInfo; |
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| 21 | class MachineInstr; |
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| 22 | class MachineIRBuilder; |
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| 23 | |||
| 24 | // Contains information relevant to enabling/disabling various combines for a |
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| 25 | // pass. |
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| 26 | class CombinerInfo { |
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| 27 | public: |
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| 28 | CombinerInfo(bool AllowIllegalOps, bool ShouldLegalizeIllegal, |
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| 29 | const LegalizerInfo *LInfo, bool OptEnabled, bool OptSize, |
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| 30 | bool MinSize) |
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| 31 | : IllegalOpsAllowed(AllowIllegalOps), |
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| 32 | LegalizeIllegalOps(ShouldLegalizeIllegal), LInfo(LInfo), |
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| 33 | EnableOpt(OptEnabled), EnableOptSize(OptSize), EnableMinSize(MinSize) { |
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| 34 | assert(((AllowIllegalOps || !LegalizeIllegalOps) || LInfo) && |
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| 35 | "Expecting legalizerInfo when illegalops not allowed"); |
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| 36 | } |
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| 37 | virtual ~CombinerInfo() = default; |
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| 38 | /// If \p IllegalOpsAllowed is false, the CombinerHelper will make use of |
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| 39 | /// the legalizerInfo to check for legality before each transformation. |
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| 40 | bool IllegalOpsAllowed; // TODO: Make use of this. |
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| 41 | |||
| 42 | /// If \p LegalizeIllegalOps is true, the Combiner will also legalize the |
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| 43 | /// illegal ops that are created. |
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| 44 | bool LegalizeIllegalOps; // TODO: Make use of this. |
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| 45 | const LegalizerInfo *LInfo; |
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| 46 | |||
| 47 | /// Whether optimizations should be enabled. This is to distinguish between |
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| 48 | /// uses of the combiner unconditionally and only when optimizations are |
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| 49 | /// specifically enabled/ |
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| 50 | bool EnableOpt; |
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| 51 | /// Whether we're optimizing for size. |
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| 52 | bool EnableOptSize; |
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| 53 | /// Whether we're optimizing for minsize (-Oz). |
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| 54 | bool EnableMinSize; |
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| 55 | |||
| 56 | /// Attempt to combine instructions using MI as the root. |
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| 57 | /// |
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| 58 | /// Use Observer to report the creation, modification, and erasure of |
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| 59 | /// instructions. GISelChangeObserver will automatically report certain |
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| 60 | /// kinds of operations. These operations are: |
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| 61 | /// * Instructions that are newly inserted into the MachineFunction |
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| 62 | /// * Instructions that are erased from the MachineFunction. |
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| 63 | /// |
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| 64 | /// However, it is important to report instruction modification and this is |
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| 65 | /// not automatic. |
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| 66 | virtual bool combine(GISelChangeObserver &Observer, MachineInstr &MI, |
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| 67 | MachineIRBuilder &B) const = 0; |
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| 68 | }; |
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| 69 | } // namespace llvm |
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| 70 | |||
| 71 | #endif |