lib/Target/Mips/MipsSubtarget.cpp

   1 //===- MipsSubtarget.cpp - Mips Subtarget Information -----------*- C++ -*-===//
   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 TargetSubtarget.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "MipsSubtarget.h"
  15 #include "Mips.h"
  16 #include "MipsGenSubtarget.inc"
  17 #include "llvm/Module.h"
  18 #include "llvm/Support/CommandLine.h"
  19 using namespace llvm;
  20
  21 static cl::opt<bool>
  22 NotABICall("disable-mips-abicall", cl::Hidden,
  23            cl::desc("Disable code for SVR4-style dynamic objects"));
  24 static cl::opt<bool>
  25 AbsoluteCall("enable-mips-absolute-call", cl::Hidden,
  26              cl::desc("Enable absolute call within abicall"));
  27 static cl::opt<unsigned>
  28 SSThreshold("mips-ssection-threshold", cl::Hidden,
  29             cl::desc("Small data and bss section threshold size (default=8)"),
  30             cl::init(8));
  31
  32 MipsSubtarget::MipsSubtarget(const TargetMachine &TM, const Module &M,
  33                              const std::string &FS, bool little) :
  34   MipsArchVersion(Mips1), MipsABI(O32), IsLittle(little), IsSingleFloat(false),
  35   IsFP64bit(false), IsGP64bit(false), HasVFPU(false), HasABICall(true),
  36   HasAbsoluteCall(false), IsLinux(true), HasSEInReg(false), HasCondMov(false),
  37   HasMulDivAdd(false), HasMinMax(false), HasSwap(false), HasBitCount(false)
  38 {
  39   std::string CPU = "mips1";
  40
  41   // Parse features string.
  42   ParseSubtargetFeatures(FS, CPU);
  43   const std::string& TT = M.getTargetTriple();
  44
  45   // Small section size threshold
  46   SSectionThreshold = SSThreshold;
  47
  48   // Is the target system Linux ?
  49   if (TT.find("linux") == std::string::npos)
  50     IsLinux = false;
  51
  52   // When only the target triple is specified and is
  53   // a allegrex target, set the features. We also match
  54   // big and little endian allegrex cores (dont really
  55   // know if a big one exists)
  56   if (TT.find("mipsallegrex") != std::string::npos ||
  57       TT.find("psp") != std::string::npos) {
  58     MipsABI = EABI;
  59     IsSingleFloat = true;
  60     MipsArchVersion = Mips2;
  61     HasVFPU = true; // Enables Allegrex Vector FPU (not supported yet)
  62     HasSEInReg = true;
  63     HasBitCount = true;
  64     HasSwap = true;
  65     HasCondMov = true;
  66   }
  67
  68   // Abicall is the default for O32 ABI, but is disabled within EABI and in
  69   // static code.
  70   if (NotABICall || isABI_EABI() || (TM.getRelocationModel() == Reloc::Static))
  71     HasABICall = false;
  72
  73   // TODO: disable when handling 64 bit symbols in the future.
  74   if (HasABICall && AbsoluteCall)
  75     HasAbsoluteCall = true;
  76 }