MipsSubtarget.cpp revision 5ca6b02d22442a8b55a523d42981e026b3b07dcb 
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  MipsGenSubtargetInfo(TT, CPU, FS),
30  MipsArchVersion(Mips32), MipsABI(UnknownABI), IsLittle(little),
31  IsSingleFloat(false), IsFP64bit(false), IsGP64bit(false), HasVFPU(false),
32  IsLinux(true), HasSEInReg(false), HasCondMov(false), HasMulDivAdd(false),
33  HasMinMax(false), HasSwap(false), HasBitCount(false)
34{
35  std::string CPUName = CPU;
36  if (CPUName.empty())
37    CPUName = "mips32";
38
39  // Parse features string.
40  ParseSubtargetFeatures(CPUName, FS);
41
42  // Initialize scheduling itinerary for the specified CPU.
43  InstrItins = getInstrItineraryForCPU(CPUName);
44
45  // Set MipsABI if it hasn't been set yet.
46  if (MipsABI == UnknownABI)
47    MipsABI = hasMips64() ? N64 : O32;
48
49  // Check if Architecture and ABI are compatible.
50  assert(((!hasMips64() && (isABI_O32() || isABI_EABI())) ||
51          (hasMips64() && (isABI_N32() || isABI_N64()))) &&
52         "Invalid  Arch & ABI pair.");
53
54  // Is the target system Linux ?
55  if (TT.find("linux") == std::string::npos)
56    IsLinux = false;
57}
58
59bool
60MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
61                                    TargetSubtargetInfo::AntiDepBreakMode& Mode,
62                                     RegClassVector& CriticalPathRCs) const {
63  Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL;
64  CriticalPathRCs.clear();
65  CriticalPathRCs.push_back(hasMips64() ?
66                            &Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass);
67  return OptLevel >= CodeGenOpt::Aggressive;
68}
69