llvm-6502/lib/Target/Mips/MipsSubtarget.cpp
2008-07-30 17:01:06 +00:00

70 lines
2.5 KiB
C++

//===- MipsSubtarget.cpp - Mips Subtarget Information -----------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the Mips specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#include "MipsSubtarget.h"
#include "Mips.h"
#include "MipsGenSubtarget.inc"
#include "llvm/Module.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;
cl::opt<bool> NotABICall("disable-mips-abicall", cl::Hidden,
cl::desc("Disable code for SVR4-style dynamic objects"));
cl::opt<bool> AbsoluteCall("enable-mips-absolute-call", cl::Hidden,
cl::desc("Enable absolute call within abicall"));
cl::opt<unsigned> SSThreshold("mips-ssection-threshold", cl::Hidden,
cl::desc("Small data and bss section threshold size (default=8)"),
cl::init(8));
MipsSubtarget::MipsSubtarget(const TargetMachine &TM, const Module &M,
const std::string &FS, bool little) :
MipsArchVersion(Mips1), MipsABI(O32), IsLittle(little), IsSingleFloat(false),
IsFP64bit(false), IsGP64bit(false), HasVFPU(false), HasABICall(true),
HasAbsoluteCall(false), IsLinux(true), HasSEInReg(false), HasCondMov(false),
HasMulDivAdd(false), HasMinMax(false), HasSwap(false), HasBitCount(false)
{
std::string CPU = "mips1";
// Parse features string.
ParseSubtargetFeatures(FS, CPU);
const std::string& TT = M.getTargetTriple();
// Small section size threshold
SSectionThreshold = SSThreshold;
// Is the target system Linux ?
if (TT.find("linux") == std::string::npos)
IsLinux = false;
// When only the target triple is specified and is
// a allegrex target, set the features. We also match
// big and little endian allegrex cores (dont really
// know if a big one exists)
if (TT.find("mipsallegrex") != std::string::npos) {
MipsABI = EABI;
IsSingleFloat = true;
MipsArchVersion = Mips2;
HasVFPU = true; // Enables Allegrex Vector FPU (not supported yet)
HasSEInReg = true;
}
// Abicall is the default for O32 ABI and is ignored
// for EABI.
if (NotABICall || isABI_EABI())
HasABICall = false;
// TODO: disable when handling 64 bit symbols in the future.
if (HasABICall && AbsoluteCall)
HasAbsoluteCall = true;
}