mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-23 17:29:19 +00:00
enabled and mthc1 and dmtc1 are not available (e.g. on MIPS32r1) This prevents the upper 32-bits of a double precision value from being moved to the FPU with mtc1 to an odd-numbered FPU register. This is necessary to ensure that the code generated executes correctly regardless of the current FPU mode. MIPS32r2 and above continues to use mtc1/mthc1, while MIPS-IV and above continue to use dmtc1. Differential Revision: http://reviews.llvm.org/D4465 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212930 91177308-0d34-0410-b5e6-96231b3b80d8
304 lines
10 KiB
C++
304 lines
10 KiB
C++
//===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===//
|
|
//
|
|
// 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 TargetSubtargetInfo.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "MipsMachineFunction.h"
|
|
#include "Mips.h"
|
|
#include "MipsRegisterInfo.h"
|
|
#include "MipsSubtarget.h"
|
|
#include "MipsTargetMachine.h"
|
|
#include "llvm/IR/Attributes.h"
|
|
#include "llvm/IR/Function.h"
|
|
#include "llvm/Support/CommandLine.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/TargetRegistry.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
using namespace llvm;
|
|
|
|
#define DEBUG_TYPE "mips-subtarget"
|
|
|
|
#define GET_SUBTARGETINFO_TARGET_DESC
|
|
#define GET_SUBTARGETINFO_CTOR
|
|
#include "MipsGenSubtargetInfo.inc"
|
|
|
|
// FIXME: Maybe this should be on by default when Mips16 is specified
|
|
//
|
|
static cl::opt<bool> Mixed16_32(
|
|
"mips-mixed-16-32",
|
|
cl::init(false),
|
|
cl::desc("Allow for a mixture of Mips16 "
|
|
"and Mips32 code in a single source file"),
|
|
cl::Hidden);
|
|
|
|
static cl::opt<bool> Mips_Os16(
|
|
"mips-os16",
|
|
cl::init(false),
|
|
cl::desc("Compile all functions that don' use "
|
|
"floating point as Mips 16"),
|
|
cl::Hidden);
|
|
|
|
static cl::opt<bool>
|
|
Mips16HardFloat("mips16-hard-float", cl::NotHidden,
|
|
cl::desc("MIPS: mips16 hard float enable."),
|
|
cl::init(false));
|
|
|
|
static cl::opt<bool>
|
|
Mips16ConstantIslands(
|
|
"mips16-constant-islands", cl::NotHidden,
|
|
cl::desc("MIPS: mips16 constant islands enable."),
|
|
cl::init(true));
|
|
|
|
/// Select the Mips CPU for the given triple and cpu name.
|
|
/// FIXME: Merge with the copy in MipsMCTargetDesc.cpp
|
|
static StringRef selectMipsCPU(Triple TT, StringRef CPU) {
|
|
if (CPU.empty() || CPU == "generic") {
|
|
if (TT.getArch() == Triple::mips || TT.getArch() == Triple::mipsel)
|
|
CPU = "mips32";
|
|
else
|
|
CPU = "mips64";
|
|
}
|
|
return CPU;
|
|
}
|
|
|
|
void MipsSubtarget::anchor() { }
|
|
|
|
static std::string computeDataLayout(const MipsSubtarget &ST) {
|
|
std::string Ret = "";
|
|
|
|
// There are both little and big endian mips.
|
|
if (ST.isLittle())
|
|
Ret += "e";
|
|
else
|
|
Ret += "E";
|
|
|
|
Ret += "-m:m";
|
|
|
|
// Pointers are 32 bit on some ABIs.
|
|
if (!ST.isABI_N64())
|
|
Ret += "-p:32:32";
|
|
|
|
// 8 and 16 bit integers only need no have natural alignment, but try to
|
|
// align them to 32 bits. 64 bit integers have natural alignment.
|
|
Ret += "-i8:8:32-i16:16:32-i64:64";
|
|
|
|
// 32 bit registers are always available and the stack is at least 64 bit
|
|
// aligned. On N64 64 bit registers are also available and the stack is
|
|
// 128 bit aligned.
|
|
if (ST.isABI_N64() || ST.isABI_N32())
|
|
Ret += "-n32:64-S128";
|
|
else
|
|
Ret += "-n32-S64";
|
|
|
|
return Ret;
|
|
}
|
|
|
|
MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
|
|
const std::string &FS, bool little,
|
|
Reloc::Model _RM, MipsTargetMachine *_TM)
|
|
: MipsGenSubtargetInfo(TT, CPU, FS), MipsArchVersion(Mips32),
|
|
MipsABI(UnknownABI), IsLittle(little), IsSingleFloat(false),
|
|
IsFPXX(false), IsFP64bit(false), UseOddSPReg(true), IsNaN2008bit(false),
|
|
IsGP64bit(false), HasVFPU(false), HasCnMips(false), IsLinux(true),
|
|
HasMips3_32(false), HasMips3_32r2(false), HasMips4_32(false),
|
|
HasMips4_32r2(false), HasMips5_32r2(false), InMips16Mode(false),
|
|
InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
|
|
HasDSPR2(false), AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16),
|
|
HasMSA(false), RM(_RM), OverrideMode(NoOverride), TM(_TM),
|
|
TargetTriple(TT),
|
|
DL(computeDataLayout(initializeSubtargetDependencies(CPU, FS, TM))),
|
|
TSInfo(DL), JITInfo(), InstrInfo(MipsInstrInfo::create(*TM)),
|
|
FrameLowering(MipsFrameLowering::create(*TM, *this)),
|
|
TLInfo(MipsTargetLowering::create(*TM)) {
|
|
|
|
PreviousInMips16Mode = InMips16Mode;
|
|
|
|
// Don't even attempt to generate code for MIPS-I, MIPS-II, MIPS-III, and
|
|
// MIPS-V. They have not been tested and currently exist for the integrated
|
|
// assembler only.
|
|
if (MipsArchVersion == Mips1)
|
|
report_fatal_error("Code generation for MIPS-I is not implemented", false);
|
|
if (MipsArchVersion == Mips2)
|
|
report_fatal_error("Code generation for MIPS-II is not implemented", false);
|
|
if (MipsArchVersion == Mips3)
|
|
report_fatal_error("Code generation for MIPS-III is not implemented",
|
|
false);
|
|
if (MipsArchVersion == Mips5)
|
|
report_fatal_error("Code generation for MIPS-V is not implemented", false);
|
|
|
|
// Assert exactly one ABI was chosen.
|
|
assert(MipsABI != UnknownABI);
|
|
assert((((getFeatureBits() & Mips::FeatureO32) != 0) +
|
|
((getFeatureBits() & Mips::FeatureEABI) != 0) +
|
|
((getFeatureBits() & Mips::FeatureN32) != 0) +
|
|
((getFeatureBits() & Mips::FeatureN64) != 0)) == 1);
|
|
|
|
// Check if Architecture and ABI are compatible.
|
|
assert(((!isGP64bit() && (isABI_O32() || isABI_EABI())) ||
|
|
(isGP64bit() && (isABI_N32() || isABI_N64()))) &&
|
|
"Invalid Arch & ABI pair.");
|
|
|
|
if (hasMSA() && !isFP64bit())
|
|
report_fatal_error("MSA requires a 64-bit FPU register file (FR=1 mode). "
|
|
"See -mattr=+fp64.",
|
|
false);
|
|
|
|
if (!isABI_O32() && !useOddSPReg())
|
|
report_fatal_error("-mattr=+nooddspreg is not currently permitted for a "
|
|
"the O32 ABI.",
|
|
false);
|
|
|
|
if (IsFPXX && (isABI_N32() || isABI_N64()))
|
|
report_fatal_error("FPXX is not permitted for the N32/N64 ABI's.", false);
|
|
|
|
if (hasMips32r6()) {
|
|
StringRef ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6";
|
|
|
|
assert(isFP64bit());
|
|
assert(isNaN2008());
|
|
if (hasDSP())
|
|
report_fatal_error(ISA + " is not compatible with the DSP ASE", false);
|
|
}
|
|
|
|
// Is the target system Linux ?
|
|
if (TT.find("linux") == std::string::npos)
|
|
IsLinux = false;
|
|
|
|
// Set UseSmallSection.
|
|
// TODO: Investigate the IsLinux check. I suspect it's really checking for
|
|
// bare-metal.
|
|
UseSmallSection = !IsLinux && (RM == Reloc::Static);
|
|
}
|
|
|
|
bool
|
|
MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
|
|
TargetSubtargetInfo::AntiDepBreakMode &Mode,
|
|
RegClassVector &CriticalPathRCs) const {
|
|
Mode = TargetSubtargetInfo::ANTIDEP_NONE;
|
|
CriticalPathRCs.clear();
|
|
CriticalPathRCs.push_back(isGP64bit() ? &Mips::GPR64RegClass
|
|
: &Mips::GPR32RegClass);
|
|
return OptLevel >= CodeGenOpt::Aggressive;
|
|
}
|
|
|
|
MipsSubtarget &
|
|
MipsSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS,
|
|
const TargetMachine *TM) {
|
|
std::string CPUName = selectMipsCPU(TargetTriple, CPU);
|
|
|
|
// Parse features string.
|
|
ParseSubtargetFeatures(CPUName, FS);
|
|
// Initialize scheduling itinerary for the specified CPU.
|
|
InstrItins = getInstrItineraryForCPU(CPUName);
|
|
|
|
if (InMips16Mode && !TM->Options.UseSoftFloat) {
|
|
// Hard float for mips16 means essentially to compile as soft float
|
|
// but to use a runtime library for soft float that is written with
|
|
// native mips32 floating point instructions (those runtime routines
|
|
// run in mips32 hard float mode).
|
|
TM->Options.UseSoftFloat = true;
|
|
TM->Options.FloatABIType = FloatABI::Soft;
|
|
InMips16HardFloat = true;
|
|
}
|
|
|
|
return *this;
|
|
}
|
|
|
|
//FIXME: This logic for reseting the subtarget along with
|
|
// the helper classes can probably be simplified but there are a lot of
|
|
// cases so we will defer rewriting this to later.
|
|
//
|
|
void MipsSubtarget::resetSubtarget(MachineFunction *MF) {
|
|
bool ChangeToMips16 = false, ChangeToNoMips16 = false;
|
|
DEBUG(dbgs() << "resetSubtargetFeatures" << "\n");
|
|
AttributeSet FnAttrs = MF->getFunction()->getAttributes();
|
|
ChangeToMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
|
|
"mips16");
|
|
ChangeToNoMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
|
|
"nomips16");
|
|
assert (!(ChangeToMips16 & ChangeToNoMips16) &&
|
|
"mips16 and nomips16 specified on the same function");
|
|
if (ChangeToMips16) {
|
|
if (PreviousInMips16Mode)
|
|
return;
|
|
OverrideMode = Mips16Override;
|
|
PreviousInMips16Mode = true;
|
|
setHelperClassesMips16();
|
|
return;
|
|
} else if (ChangeToNoMips16) {
|
|
if (!PreviousInMips16Mode)
|
|
return;
|
|
OverrideMode = NoMips16Override;
|
|
PreviousInMips16Mode = false;
|
|
setHelperClassesMipsSE();
|
|
return;
|
|
} else {
|
|
if (OverrideMode == NoOverride)
|
|
return;
|
|
OverrideMode = NoOverride;
|
|
DEBUG(dbgs() << "back to default" << "\n");
|
|
if (inMips16Mode() && !PreviousInMips16Mode) {
|
|
setHelperClassesMips16();
|
|
PreviousInMips16Mode = true;
|
|
} else if (!inMips16Mode() && PreviousInMips16Mode) {
|
|
setHelperClassesMipsSE();
|
|
PreviousInMips16Mode = false;
|
|
}
|
|
return;
|
|
}
|
|
}
|
|
|
|
void MipsSubtarget::setHelperClassesMips16() {
|
|
InstrInfoSE.swap(InstrInfo);
|
|
FrameLoweringSE.swap(FrameLowering);
|
|
TLInfoSE.swap(TLInfo);
|
|
if (!InstrInfo16) {
|
|
InstrInfo.reset(MipsInstrInfo::create(*TM));
|
|
FrameLowering.reset(MipsFrameLowering::create(*TM, *this));
|
|
TLInfo.reset(MipsTargetLowering::create(*TM));
|
|
} else {
|
|
InstrInfo16.swap(InstrInfo);
|
|
FrameLowering16.swap(FrameLowering);
|
|
TLInfo16.swap(TLInfo);
|
|
}
|
|
assert(TLInfo && "null target lowering 16");
|
|
assert(InstrInfo && "null instr info 16");
|
|
assert(FrameLowering && "null frame lowering 16");
|
|
}
|
|
|
|
void MipsSubtarget::setHelperClassesMipsSE() {
|
|
InstrInfo16.swap(InstrInfo);
|
|
FrameLowering16.swap(FrameLowering);
|
|
TLInfo16.swap(TLInfo);
|
|
if (!InstrInfoSE) {
|
|
InstrInfo.reset(MipsInstrInfo::create(*TM));
|
|
FrameLowering.reset(MipsFrameLowering::create(*TM, *this));
|
|
TLInfo.reset(MipsTargetLowering::create(*TM));
|
|
} else {
|
|
InstrInfoSE.swap(InstrInfo);
|
|
FrameLoweringSE.swap(FrameLowering);
|
|
TLInfoSE.swap(TLInfo);
|
|
}
|
|
assert(TLInfo && "null target lowering in SE");
|
|
assert(InstrInfo && "null instr info SE");
|
|
assert(FrameLowering && "null frame lowering SE");
|
|
}
|
|
|
|
bool MipsSubtarget::mipsSEUsesSoftFloat() const {
|
|
return TM->Options.UseSoftFloat && !InMips16HardFloat;
|
|
}
|
|
|
|
bool MipsSubtarget::useConstantIslands() {
|
|
DEBUG(dbgs() << "use constant islands " << Mips16ConstantIslands << "\n");
|
|
return Mips16ConstantIslands;
|
|
}
|