f75c6ed93e
Currently the DecoderEmitter spends a fair amount of cycles performing repeated linear walks over the entire instruction list. This patch eliminates one such walk during HwMode collection for EncodingInfos. The eliminated traversal visits every instruction and then every EncodingInfos entry for that instruction merely to collect all referenced HwModes. That information already happens to be present in the HwModeSelects created during the one-time construction of CodeGenHwModes. We instead traverse the HwModeSelects, collecting each one referenced as an encoding select. This set is a small constant in size and does not generally grow with the size of the instruction set.
71 lines
2.0 KiB
C++
71 lines
2.0 KiB
C++
//===--- CodeGenHwModes.h ---------------------------------------*- C++ -*-===//
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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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// Classes to parse and store HW mode information for instruction selection.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_CODEGENHWMODES_H
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#define LLVM_UTILS_TABLEGEN_CODEGENHWMODES_H
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringRef.h"
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#include <cassert>
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#include <map>
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#include <string>
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#include <utility>
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#include <vector>
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// HwModeId -> list of predicates (definition)
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namespace llvm {
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class Record;
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class RecordKeeper;
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struct CodeGenHwModes;
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struct HwMode {
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HwMode(Record *R);
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StringRef Name;
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std::string Features;
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std::string Predicates;
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void dump() const;
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};
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struct HwModeSelect {
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HwModeSelect(Record *R, CodeGenHwModes &CGH);
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typedef std::pair<unsigned, Record *> PairType;
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std::vector<PairType> Items;
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void dump() const;
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};
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struct CodeGenHwModes {
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enum : unsigned { DefaultMode = 0 };
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static StringRef DefaultModeName;
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CodeGenHwModes(RecordKeeper &R);
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unsigned getHwModeId(Record *R) const;
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const HwMode &getMode(unsigned Id) const {
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assert(Id != 0 && "Mode id of 0 is reserved for the default mode");
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return Modes[Id - 1];
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}
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const HwModeSelect &getHwModeSelect(Record *R) const;
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const std::map<Record *, HwModeSelect> &getHwModeSelects() const {
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return ModeSelects;
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}
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unsigned getNumModeIds() const { return Modes.size() + 1; }
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void dump() const;
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private:
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RecordKeeper &Records;
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DenseMap<Record *, unsigned> ModeIds; // HwMode Record -> HwModeId
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std::vector<HwMode> Modes;
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std::map<Record *, HwModeSelect> ModeSelects;
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};
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} // namespace llvm
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#endif // LLVM_UTILS_TABLEGEN_CODEGENHWMODES_H
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