1 //===-- RISCVSubtarget.cpp - RISCV Subtarget Information ------------------===//
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 //
9 // This file implements the RISCV specific subclass of TargetSubtargetInfo.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "RISCVSubtarget.h"
14 #include "RISCV.h"
15 #include "RISCVCallLowering.h"
16 #include "RISCVFrameLowering.h"
17 #include "RISCVLegalizerInfo.h"
18 #include "RISCVRegisterBankInfo.h"
19 #include "RISCVTargetMachine.h"
20 #include "llvm/Support/TargetRegistry.h"
21 
22 using namespace llvm;
23 
24 #define DEBUG_TYPE "riscv-subtarget"
25 
26 #define GET_SUBTARGETINFO_TARGET_DESC
27 #define GET_SUBTARGETINFO_CTOR
28 #include "RISCVGenSubtargetInfo.inc"
29 
30 void RISCVSubtarget::anchor() {}
31 
32 RISCVSubtarget &RISCVSubtarget::initializeSubtargetDependencies(
33     const Triple &TT, StringRef CPU, StringRef FS, StringRef ABIName) {
34   // Determine default and user-specified characteristics
35   bool Is64Bit = TT.isArch64Bit();
36   std::string CPUName = CPU;
37   if (CPUName.empty())
38     CPUName = Is64Bit ? "generic-rv64" : "generic-rv32";
39   ParseSubtargetFeatures(CPUName, FS);
40   if (Is64Bit) {
41     XLenVT = MVT::i64;
42     XLen = 64;
43   }
44 
45   TargetABI = RISCVABI::computeTargetABI(TT, getFeatureBits(), ABIName);
46   RISCVFeatures::validate(TT, getFeatureBits());
47   return *this;
48 }
49 
50 RISCVSubtarget::RISCVSubtarget(const Triple &TT, StringRef CPU, StringRef FS,
51                                StringRef ABIName, const TargetMachine &TM)
52     : RISCVGenSubtargetInfo(TT, CPU, FS),
53       UserReservedRegister(RISCV::NUM_TARGET_REGS),
54       FrameLowering(initializeSubtargetDependencies(TT, CPU, FS, ABIName)),
55       InstrInfo(*this), RegInfo(getHwMode()), TLInfo(TM, *this) {
56   CallLoweringInfo.reset(new RISCVCallLowering(*getTargetLowering()));
57   Legalizer.reset(new RISCVLegalizerInfo(*this));
58 
59   auto *RBI = new RISCVRegisterBankInfo(*getRegisterInfo());
60   RegBankInfo.reset(RBI);
61   InstSelector.reset(createRISCVInstructionSelector(
62       *static_cast<const RISCVTargetMachine *>(&TM), *this, *RBI));
63 }
64 
65 const CallLowering *RISCVSubtarget::getCallLowering() const {
66   return CallLoweringInfo.get();
67 }
68 
69 InstructionSelector *RISCVSubtarget::getInstructionSelector() const {
70   return InstSelector.get();
71 }
72 
73 const LegalizerInfo *RISCVSubtarget::getLegalizerInfo() const {
74   return Legalizer.get();
75 }
76 
77 const RegisterBankInfo *RISCVSubtarget::getRegBankInfo() const {
78   return RegBankInfo.get();
79 }
80