1//===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9//
10// This file implements the Mips specific subclass of TargetSubtargetInfo.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MipsSubtarget.h"
15#include "Mips.h"
16#include "MipsRegisterInfo.h"
17#include "llvm/Support/TargetRegistry.h"
18
19#define GET_SUBTARGETINFO_TARGET_DESC
20#define GET_SUBTARGETINFO_CTOR
21#include "MipsGenSubtargetInfo.inc"
22
23using namespace llvm;
24
25void MipsSubtarget::anchor() { }
26
27MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
28                             const std::string &FS, bool little,
29                             Reloc::Model RM) :
30  MipsGenSubtargetInfo(TT, CPU, FS),
31  MipsArchVersion(Mips32), MipsABI(UnknownABI), IsLittle(little),
32  IsSingleFloat(false), IsFP64bit(false), IsGP64bit(false), HasVFPU(false),
33  IsLinux(true), HasSEInReg(false), HasCondMov(false), HasMulDivAdd(false),
34  HasMinMax(false), HasSwap(false), HasBitCount(false), InMips16Mode(false)
35{
36  std::string CPUName = CPU;
37  if (CPUName.empty())
38    CPUName = "mips32";
39
40  // Parse features string.
41  ParseSubtargetFeatures(CPUName, FS);
42
43  // Initialize scheduling itinerary for the specified CPU.
44  InstrItins = getInstrItineraryForCPU(CPUName);
45
46  // Set MipsABI if it hasn't been set yet.
47  if (MipsABI == UnknownABI)
48    MipsABI = hasMips64() ? N64 : O32;
49
50  // Check if Architecture and ABI are compatible.
51  assert(((!hasMips64() && (isABI_O32() || isABI_EABI())) ||
52          (hasMips64() && (isABI_N32() || isABI_N64()))) &&
53         "Invalid  Arch & ABI pair.");
54
55  // Is the target system Linux ?
56  if (TT.find("linux") == std::string::npos)
57    IsLinux = false;
58
59  // Set UseSmallSection.
60  UseSmallSection = !IsLinux && (RM == Reloc::Static);
61}
62
63bool
64MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
65                                    TargetSubtargetInfo::AntiDepBreakMode &Mode,
66                                     RegClassVector &CriticalPathRCs) const {
67  Mode = TargetSubtargetInfo::ANTIDEP_NONE;
68  CriticalPathRCs.clear();
69  CriticalPathRCs.push_back(hasMips64() ?
70                            &Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass);
71  return OptLevel >= CodeGenOpt::Aggressive;
72}
73