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 
23 using namespace llvm;
24 
25 void MipsSubtarget::anchor() { }
26 
27 MipsSubtarget::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), HasFPIdx(false),
35   InMips16Mode(false), HasDSP(false), HasDSPR2(false), IsAndroid(false)
36 {
37   std::string CPUName = CPU;
38   if (CPUName.empty())
39     CPUName = "mips32";
40 
41   // Parse features string.
42   ParseSubtargetFeatures(CPUName, FS);
43 
44   // Initialize scheduling itinerary for the specified CPU.
45   InstrItins = getInstrItineraryForCPU(CPUName);
46 
47   // Set MipsABI if it hasn't been set yet.
48   if (MipsABI == UnknownABI)
49     MipsABI = hasMips64() ? N64 : O32;
50 
51   // Check if Architecture and ABI are compatible.
52   assert(((!hasMips64() && (isABI_O32() || isABI_EABI())) ||
53           (hasMips64() && (isABI_N32() || isABI_N64()))) &&
54          "Invalid  Arch & ABI pair.");
55 
56   // Is the target system Linux ?
57   if (TT.find("linux") == std::string::npos)
58     IsLinux = false;
59 
60   // Set UseSmallSection.
61   UseSmallSection = !IsLinux && (RM == Reloc::Static);
62 }
63 
64 bool
65 MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
66                                     TargetSubtargetInfo::AntiDepBreakMode &Mode,
67                                      RegClassVector &CriticalPathRCs) const {
68   Mode = TargetSubtargetInfo::ANTIDEP_NONE;
69   CriticalPathRCs.clear();
70   CriticalPathRCs.push_back(hasMips64() ?
71                             &Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass);
72   return OptLevel >= CodeGenOpt::Aggressive;
73 }
74