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//===-- llvm/CodeGen/MachineCombinerPattern.h - Instruction pattern supported by
// combiner ------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines instruction pattern supported by combiner
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_MACHINECOMBINERPATTERN_H
#define LLVM_CODEGEN_MACHINECOMBINERPATTERN_H
namespace llvm {
/// The combiner's goal may differ based on which pattern it is attempting
/// to optimize.
enum class CombinerObjective {
MustReduceDepth, // The data dependency chain must be improved.
MustReduceRegisterPressure, // The register pressure must be reduced.
Default // The critical path must not be lengthened.
};
/// These are instruction patterns matched by the machine combiner pass.
enum MachineCombinerPattern : unsigned {
// These are commutative variants for reassociating a computation chain. See
// the comments before getMachineCombinerPatterns() in TargetInstrInfo.cpp.
REASSOC_AX_BY,
REASSOC_AX_YB,
REASSOC_XA_BY,
REASSOC_XA_YB,
TARGET_PATTERN_START
};
} // end namespace llvm
#endif
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