db6bc2ab51
If possible fold fneg into instruction above if users cannot fold mods and we know it will decrease instruction count. Follows same logic as SDAG combiner in choosing opportunities to combine. Differential Revision: https://reviews.llvm.org/D112827
27 lines
925 B
C++
27 lines
925 B
C++
//=== lib/CodeGen/GlobalISel/AMDGPUCombinerHelper.h -----------------------===//
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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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/// \file
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/// This contains common combine transformations that may be used in a combine
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/// pass.
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///
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/GlobalISel/Combiner.h"
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#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
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using namespace llvm;
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class AMDGPUCombinerHelper : public CombinerHelper {
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public:
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using CombinerHelper::CombinerHelper;
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bool matchFoldableFneg(MachineInstr &MI, MachineInstr *&MatchInfo);
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void applyFoldableFneg(MachineInstr &MI, MachineInstr *&MatchInfo);
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};
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