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3f71db1efb
The original patch caused crashes because it could derefence a null pointer for SelectionDAGTargetInfo for targets that do not define it. Evaluates fmul+fadd -> fmadd combines and similar code sequences in the machine combiner. It adds support for float and double similar to the existing integer implementation. The key features are: - DAGCombiner checks whether it should combine greedily or let the machine combiner do the evaluation. This is only supported on ARM64. - It gives preference to throughput over latency: the heuristic used is to combine always in loops. The targets decides whether the machine combiner should optimize for throughput or latency. - Supports for fmadd, f(n)msub, fmla, fmls patterns - On by default at O3 ffast-math git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267328 91177308-0d34-0410-b5e6-96231b3b80d8
80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
//===-- llvm/CodeGen/MachineCombinerPattern.h - Instruction pattern supported by
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// combiner ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines instruction pattern supported by combiner
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINECOMBINERPATTERN_H
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#define LLVM_CODEGEN_MACHINECOMBINERPATTERN_H
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namespace llvm {
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/// These are instruction patterns matched by the machine combiner pass.
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enum class MachineCombinerPattern {
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// These are commutative variants for reassociating a computation chain. See
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// the comments before getMachineCombinerPatterns() in TargetInstrInfo.cpp.
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REASSOC_AX_BY,
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REASSOC_AX_YB,
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REASSOC_XA_BY,
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REASSOC_XA_YB,
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// These are multiply-add patterns matched by the AArch64 machine combiner.
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MULADDW_OP1,
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MULADDW_OP2,
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MULSUBW_OP1,
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MULSUBW_OP2,
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MULADDWI_OP1,
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MULSUBWI_OP1,
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MULADDX_OP1,
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MULADDX_OP2,
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MULSUBX_OP1,
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MULSUBX_OP2,
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MULADDXI_OP1,
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MULSUBXI_OP1,
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// Floating Point
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FMULADDS_OP1,
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FMULADDS_OP2,
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FMULSUBS_OP1,
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FMULSUBS_OP2,
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FMULADDD_OP1,
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FMULADDD_OP2,
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FMULSUBD_OP1,
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FMULSUBD_OP2,
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FMLAv1i32_indexed_OP1,
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FMLAv1i32_indexed_OP2,
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FMLAv1i64_indexed_OP1,
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FMLAv1i64_indexed_OP2,
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FMLAv2f32_OP2,
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FMLAv2f32_OP1,
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FMLAv2f64_OP1,
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FMLAv2f64_OP2,
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FMLAv2i32_indexed_OP1,
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FMLAv2i32_indexed_OP2,
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FMLAv2i64_indexed_OP1,
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FMLAv2i64_indexed_OP2,
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FMLAv4f32_OP1,
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FMLAv4f32_OP2,
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FMLAv4i32_indexed_OP1,
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FMLAv4i32_indexed_OP2,
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FMLSv1i32_indexed_OP2,
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FMLSv1i64_indexed_OP2,
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FMLSv2i32_indexed_OP2,
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FMLSv2i64_indexed_OP2,
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FMLSv2f32_OP2,
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FMLSv2f64_OP2,
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FMLSv4i32_indexed_OP2,
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FMLSv4f32_OP2
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};
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} // end namespace llvm
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#endif
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