1 //===-- RISCVInstructionSelector.cpp -----------------------------*- 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 /// \file
9 /// This file implements the targeting of the InstructionSelector class for
10 /// RISCV.
11 /// \todo This should be generated by TableGen.
12 //===----------------------------------------------------------------------===//
13
14 #include "RISCVRegisterBankInfo.h"
15 #include "RISCVSubtarget.h"
16 #include "RISCVTargetMachine.h"
17 #include "llvm/CodeGen/GlobalISel/InstructionSelector.h"
18 #include "llvm/CodeGen/GlobalISel/InstructionSelectorImpl.h"
19 #include "llvm/Support/Debug.h"
20
21 #define DEBUG_TYPE "riscv-isel"
22
23 using namespace llvm;
24
25 #define GET_GLOBALISEL_PREDICATE_BITSET
26 #include "RISCVGenGlobalISel.inc"
27 #undef GET_GLOBALISEL_PREDICATE_BITSET
28
29 namespace {
30
31 class RISCVInstructionSelector : public InstructionSelector {
32 public:
33 RISCVInstructionSelector(const RISCVTargetMachine &TM,
34 const RISCVSubtarget &STI,
35 const RISCVRegisterBankInfo &RBI);
36
37 bool select(MachineInstr &I) override;
getName()38 static const char *getName() { return DEBUG_TYPE; }
39
40 private:
41 bool selectImpl(MachineInstr &I, CodeGenCoverage &CoverageInfo) const;
42
43 const RISCVSubtarget &STI;
44 const RISCVInstrInfo &TII;
45 const RISCVRegisterInfo &TRI;
46 const RISCVRegisterBankInfo &RBI;
47
48 // FIXME: This is necessary because DAGISel uses "Subtarget->" and GlobalISel
49 // uses "STI." in the code generated by TableGen. We need to unify the name of
50 // Subtarget variable.
51 const RISCVSubtarget *Subtarget = &STI;
52
53 #define GET_GLOBALISEL_PREDICATES_DECL
54 #include "RISCVGenGlobalISel.inc"
55 #undef GET_GLOBALISEL_PREDICATES_DECL
56
57 #define GET_GLOBALISEL_TEMPORARIES_DECL
58 #include "RISCVGenGlobalISel.inc"
59 #undef GET_GLOBALISEL_TEMPORARIES_DECL
60 };
61
62 } // end anonymous namespace
63
64 #define GET_GLOBALISEL_IMPL
65 #include "RISCVGenGlobalISel.inc"
66 #undef GET_GLOBALISEL_IMPL
67
RISCVInstructionSelector(const RISCVTargetMachine & TM,const RISCVSubtarget & STI,const RISCVRegisterBankInfo & RBI)68 RISCVInstructionSelector::RISCVInstructionSelector(
69 const RISCVTargetMachine &TM, const RISCVSubtarget &STI,
70 const RISCVRegisterBankInfo &RBI)
71 : InstructionSelector(), STI(STI), TII(*STI.getInstrInfo()),
72 TRI(*STI.getRegisterInfo()), RBI(RBI),
73
74 #define GET_GLOBALISEL_PREDICATES_INIT
75 #include "RISCVGenGlobalISel.inc"
76 #undef GET_GLOBALISEL_PREDICATES_INIT
77 #define GET_GLOBALISEL_TEMPORARIES_INIT
78 #include "RISCVGenGlobalISel.inc"
79 #undef GET_GLOBALISEL_TEMPORARIES_INIT
80 {
81 }
82
select(MachineInstr & I)83 bool RISCVInstructionSelector::select(MachineInstr &I) {
84
85 if (!isPreISelGenericOpcode(I.getOpcode())) {
86 // Certain non-generic instructions also need some special handling.
87 return true;
88 }
89
90 if (selectImpl(I, *CoverageInfo))
91 return true;
92
93 return false;
94 }
95
96 namespace llvm {
97 InstructionSelector *
createRISCVInstructionSelector(const RISCVTargetMachine & TM,RISCVSubtarget & Subtarget,RISCVRegisterBankInfo & RBI)98 createRISCVInstructionSelector(const RISCVTargetMachine &TM,
99 RISCVSubtarget &Subtarget,
100 RISCVRegisterBankInfo &RBI) {
101 return new RISCVInstructionSelector(TM, Subtarget, RBI);
102 }
103 } // end namespace llvm
104