1 //===--- CodeGenHwModes.h ---------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 // Classes to parse and store HW mode information for instruction selection.
9 //===----------------------------------------------------------------------===//
10 
11 #ifndef LLVM_UTILS_TABLEGEN_CODEGENHWMODES_H
12 #define LLVM_UTILS_TABLEGEN_CODEGENHWMODES_H
13 
14 #include "llvm/ADT/DenseMap.h"
15 #include "llvm/ADT/StringRef.h"
16 #include <cassert>
17 #include <map>
18 #include <string>
19 #include <utility>
20 #include <vector>
21 
22 // HwModeId -> list of predicates (definition)
23 
24 namespace llvm {
25   class Record;
26   class RecordKeeper;
27 
28   struct CodeGenHwModes;
29 
30   struct HwMode {
31     HwMode(Record *R);
32     StringRef Name;
33     std::string Features;
34     std::string Predicates;
35     void dump() const;
36   };
37 
38   struct HwModeSelect {
39     HwModeSelect(Record *R, CodeGenHwModes &CGH);
40     typedef std::pair<unsigned, Record*> PairType;
41     std::vector<PairType> Items;
42     void dump() const;
43   };
44 
45   struct CodeGenHwModes {
46     enum : unsigned { DefaultMode = 0 };
47     static StringRef DefaultModeName;
48 
49     CodeGenHwModes(RecordKeeper &R);
50     unsigned getHwModeId(Record *R) const;
51     const HwMode &getMode(unsigned Id) const {
52       assert(Id != 0 && "Mode id of 0 is reserved for the default mode");
53       return Modes[Id-1];
54     }
55     const HwModeSelect &getHwModeSelect(Record *R) const;
56     unsigned getNumModeIds() const { return Modes.size()+1; }
57     void dump() const;
58 
59   private:
60     RecordKeeper &Records;
61     DenseMap<Record *, unsigned> ModeIds;  // HwMode Record -> HwModeId
62     std::vector<HwMode> Modes;
63     std::map<Record*,HwModeSelect> ModeSelects;
64   };
65 }
66 
67 #endif // LLVM_UTILS_TABLEGEN_CODEGENHWMODES_H
68