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conditional branches for very large targets. That will be the next small patch. Everything now should in principle work as good (functionality wise) as without constant islands so we decided at Mips/Imagination to make constant islands the default for Mips16 now so that it will get excercised a lot and this port is still experimentatl though hopefully soon we will change the status. Some more cleanup and code review is in order but things are converging fast. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195902 91177308-0d34-0410-b5e6-96231b3b80d8
187 lines
6.2 KiB
C++
187 lines
6.2 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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static cl::opt<bool>
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Mips16HardFloat("mips16-hard-float", cl::NotHidden,
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cl::desc("MIPS: mips16 hard float enable."),
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cl::init(false));
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static cl::opt<bool>
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Mips16ConstantIslands(
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"mips16-constant-islands", cl::NotHidden,
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cl::desc("MIPS: mips16 constant islands enable."),
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cl::init(true));
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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), InMips16HardFloat(Mips16HardFloat),
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InMicroMipsMode(false), HasDSP(false), HasDSPR2(false),
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AllowMixed16_32(Mixed16_32 | Mips_Os16), Os16(Mips_Os16), HasMSA(false),
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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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if (InMips16Mode && !TM->Options.UseSoftFloat) {
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// Hard float for mips16 means essentially to compile as soft float
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// but to use a runtime library for soft float that is written with
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// native mips32 floating point instructions (those runtime routines
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// run in mips32 hard float mode).
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TM->Options.UseSoftFloat = true;
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TM->Options.FloatABIType = FloatABI::Soft;
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InMips16HardFloat = true;
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}
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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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if (hasMSA() && !isFP64bit())
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report_fatal_error("MSA requires a 64-bit FPU register file (FR=1 mode). "
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"See -mattr=+fp64.",
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false);
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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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// set some subtarget specific features
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if (inMips16Mode())
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HasBitCount=false;
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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::GPR64RegClass : &Mips::GPR32RegClass);
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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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bool MipsSubtarget::mipsSEUsesSoftFloat() const {
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return TM->Options.UseSoftFloat && !InMips16HardFloat;
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}
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bool MipsSubtarget::useConstantIslands() {
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DEBUG(dbgs() << "use constant islands " << Mips16ConstantIslands << "\n");
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return Mips16ConstantIslands;
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}
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