7f4c297e94
`Predicates` and `Features` fields serve the same purpose. They should be kept in sync, but not all predicates are based on features. This resulted in introducing dummy features for that only reason. This patch removes `Features` field and changes TableGen emitters to use `Predicates` instead. Historically, predicates were written with the assumption that the checking code will be used in `SelectionDAGISel` subclasses, meaning they will have access to the subclass variables, such as `Subtarget`. There are no such variables in the generated `GenSubtargetInfo::getHwModeSet()`, so we need to provide them. This can be achieved by subclassing `HwModePredicateProlog`, see an example in `Hexagon.td`.
75 lines
2.2 KiB
C++
75 lines
2.2 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_COMMON_CODEGENHWMODES_H
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#define LLVM_UTILS_TABLEGEN_COMMON_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(const Record *R);
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StringRef Name;
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std::vector<const Record *> Predicates;
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void dump() const;
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};
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struct HwModeSelect {
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HwModeSelect(const Record *R, CodeGenHwModes &CGH);
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typedef std::pair<unsigned, const 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(const RecordKeeper &R);
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unsigned getHwModeId(const 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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StringRef getModeName(unsigned Id, bool IncludeDefault = false) const {
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if (IncludeDefault && Id == CodeGenHwModes::DefaultMode)
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return DefaultModeName;
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return getMode(Id).Name;
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}
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const HwModeSelect &getHwModeSelect(const Record *R) const;
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const std::map<const 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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const RecordKeeper &Records;
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DenseMap<const Record *, unsigned> ModeIds; // HwMode Record -> HwModeId
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std::vector<HwMode> Modes;
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std::map<const Record *, HwModeSelect> ModeSelects;
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};
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} // namespace llvm
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#endif // LLVM_UTILS_TABLEGEN_COMMON_CODEGENHWMODES_H
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