forked from OSchip/llvm-project
149 lines
4.9 KiB
C++
149 lines
4.9 KiB
C++
//===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the Mips specific subclass of TargetSubtargetInfo.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "mips-subtarget"
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#include "MipsMachineFunction.h"
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#include "MipsSubtarget.h"
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#include "MipsTargetMachine.h"
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#include "Mips.h"
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#include "MipsRegisterInfo.h"
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#include "llvm/IR/Attributes.h"
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#include "llvm/IR/Function.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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#define GET_SUBTARGETINFO_TARGET_DESC
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#define GET_SUBTARGETINFO_CTOR
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#include "MipsGenSubtargetInfo.inc"
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using namespace llvm;
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// FIXME: Maybe this should be on by default when Mips16 is specified
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//
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static cl::opt<bool> Mixed16_32(
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"mips-mixed-16-32",
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cl::init(false),
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cl::desc("Allow for a mixture of Mips16 "
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"and Mips32 code in a single source file"),
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cl::Hidden);
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static cl::opt<bool> Mips_Os16(
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"mips-os16",
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cl::init(false),
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cl::desc("Compile all functions that don' use "
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"floating point as Mips 16"),
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cl::Hidden);
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void MipsSubtarget::anchor() { }
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MipsSubtarget::MipsSubtarget(const std::string &TT, const std::string &CPU,
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const std::string &FS, bool little,
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Reloc::Model _RM, MipsTargetMachine *_TM) :
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MipsGenSubtargetInfo(TT, CPU, FS),
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MipsArchVersion(Mips32), MipsABI(UnknownABI), IsLittle(little),
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IsSingleFloat(false), IsFP64bit(false), IsGP64bit(false), HasVFPU(false),
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IsLinux(true), HasSEInReg(false), HasCondMov(false), HasSwap(false),
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HasBitCount(false), HasFPIdx(false),
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InMips16Mode(false), InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
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AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16),
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RM(_RM), OverrideMode(NoOverride), TM(_TM)
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{
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std::string CPUName = CPU;
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if (CPUName.empty())
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CPUName = "mips32";
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// Parse features string.
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ParseSubtargetFeatures(CPUName, FS);
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PreviousInMips16Mode = InMips16Mode;
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// Initialize scheduling itinerary for the specified CPU.
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InstrItins = getInstrItineraryForCPU(CPUName);
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// Set MipsABI if it hasn't been set yet.
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if (MipsABI == UnknownABI)
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MipsABI = hasMips64() ? N64 : O32;
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// Check if Architecture and ABI are compatible.
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assert(((!hasMips64() && (isABI_O32() || isABI_EABI())) ||
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(hasMips64() && (isABI_N32() || isABI_N64()))) &&
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"Invalid Arch & ABI pair.");
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// Is the target system Linux ?
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if (TT.find("linux") == std::string::npos)
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IsLinux = false;
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// Set UseSmallSection.
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UseSmallSection = !IsLinux && (RM == Reloc::Static);
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}
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bool
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MipsSubtarget::enablePostRAScheduler(CodeGenOpt::Level OptLevel,
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TargetSubtargetInfo::AntiDepBreakMode &Mode,
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RegClassVector &CriticalPathRCs) const {
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Mode = TargetSubtargetInfo::ANTIDEP_NONE;
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CriticalPathRCs.clear();
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CriticalPathRCs.push_back(hasMips64() ?
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&Mips::CPU64RegsRegClass : &Mips::CPURegsRegClass);
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return OptLevel >= CodeGenOpt::Aggressive;
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}
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//FIXME: This logic for reseting the subtarget along with
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// the helper classes can probably be simplified but there are a lot of
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// cases so we will defer rewriting this to later.
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//
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void MipsSubtarget::resetSubtarget(MachineFunction *MF) {
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bool ChangeToMips16 = false, ChangeToNoMips16 = false;
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DEBUG(dbgs() << "resetSubtargetFeatures" << "\n");
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AttributeSet FnAttrs = MF->getFunction()->getAttributes();
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ChangeToMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
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"mips16");
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ChangeToNoMips16 = FnAttrs.hasAttribute(AttributeSet::FunctionIndex,
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"nomips16");
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assert (!(ChangeToMips16 & ChangeToNoMips16) &&
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"mips16 and nomips16 specified on the same function");
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if (ChangeToMips16) {
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if (PreviousInMips16Mode)
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return;
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OverrideMode = Mips16Override;
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PreviousInMips16Mode = true;
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TM->setHelperClassesMips16();
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return;
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} else if (ChangeToNoMips16) {
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if (!PreviousInMips16Mode)
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return;
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OverrideMode = NoMips16Override;
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PreviousInMips16Mode = false;
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TM->setHelperClassesMipsSE();
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return;
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} else {
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if (OverrideMode == NoOverride)
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return;
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OverrideMode = NoOverride;
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DEBUG(dbgs() << "back to default" << "\n");
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if (inMips16Mode() && !PreviousInMips16Mode) {
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TM->setHelperClassesMips16();
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PreviousInMips16Mode = true;
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} else if (!inMips16Mode() && PreviousInMips16Mode) {
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TM->setHelperClassesMipsSE();
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PreviousInMips16Mode = false;
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}
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return;
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}
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}
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