| 1 | //===-- llvm/CodeGen/MachineCombinerPattern.h - Instruction pattern supported by |
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| 2 | // combiner ------*- C++ -*-===// |
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| 3 | // |
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| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 5 | // See https://llvm.org/LICENSE.txt for license information. |
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| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 7 | // |
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| 8 | //===----------------------------------------------------------------------===// |
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| 9 | // |
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| 10 | // This file defines instruction pattern supported by combiner |
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| 11 | // |
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| 12 | //===----------------------------------------------------------------------===// |
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| 13 | |
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| 14 | #ifndef LLVM_CODEGEN_MACHINECOMBINERPATTERN_H |
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| 15 | #define LLVM_CODEGEN_MACHINECOMBINERPATTERN_H |
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| 16 | |
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| 17 | namespace llvm { |
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| 18 | |
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| 19 | /// The combiner's goal may differ based on which pattern it is attempting |
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| 20 | /// to optimize. |
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| 21 | enum class CombinerObjective { |
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| 22 | MustReduceDepth, // The data dependency chain must be improved. |
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| 23 | MustReduceRegisterPressure, // The register pressure must be reduced. |
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| 24 | Default // The critical path must not be lengthened. |
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| 25 | }; |
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| 26 | |
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| 27 | /// These are instruction patterns matched by the machine combiner pass. |
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| 28 | enum MachineCombinerPattern : unsigned { |
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| 29 | // These are commutative variants for reassociating a computation chain. See |
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| 30 | // the comments before getMachineCombinerPatterns() in TargetInstrInfo.cpp. |
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| 31 | REASSOC_AX_BY, |
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| 32 | REASSOC_AX_YB, |
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| 33 | REASSOC_XA_BY, |
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| 34 | REASSOC_XA_YB, |
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| 35 | |
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| 36 | TARGET_PATTERN_START |
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| 37 | }; |
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| 38 | |
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| 39 | } // end namespace llvm |
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| 40 | |
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| 41 | #endif |
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| 42 | |
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