296 lines
11 KiB
C++
296 lines
11 KiB
C++
//===-- MipsSubtarget.cpp - Mips Subtarget Information --------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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#include "MipsSubtarget.h"
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#include "Mips.h"
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#include "MipsMachineFunction.h"
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#include "MipsRegisterInfo.h"
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#include "MipsTargetMachine.h"
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#include "MipsCallLowering.h"
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#include "MipsLegalizerInfo.h"
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#include "MipsRegisterBankInfo.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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using namespace llvm;
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#define DEBUG_TYPE "mips-subtarget"
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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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// FIXME: Maybe this should be on by default when Mips16 is specified
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//
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static cl::opt<bool>
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Mixed16_32("mips-mixed-16-32", 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 output file"),
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cl::Hidden);
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static cl::opt<bool> Mips_Os16("mips-os16", cl::init(false),
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cl::desc("Compile all functions that don't use "
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"floating point as Mips 16"),
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cl::Hidden);
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static cl::opt<bool> Mips16HardFloat("mips16-hard-float", cl::NotHidden,
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cl::desc("Enable mips16 hard float."),
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cl::init(false));
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static cl::opt<bool>
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Mips16ConstantIslands("mips16-constant-islands", cl::NotHidden,
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cl::desc("Enable mips16 constant islands."),
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cl::init(true));
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static cl::opt<bool>
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GPOpt("mgpopt", cl::Hidden,
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cl::desc("Enable gp-relative addressing of mips small data items"));
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bool MipsSubtarget::DspWarningPrinted = false;
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bool MipsSubtarget::MSAWarningPrinted = false;
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bool MipsSubtarget::VirtWarningPrinted = false;
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bool MipsSubtarget::CRCWarningPrinted = false;
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bool MipsSubtarget::GINVWarningPrinted = false;
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void MipsSubtarget::anchor() {}
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MipsSubtarget::MipsSubtarget(const Triple &TT, StringRef CPU, StringRef FS,
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bool little, const MipsTargetMachine &TM,
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MaybeAlign StackAlignOverride)
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: MipsGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS),
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MipsArchVersion(MipsDefault), IsLittle(little), IsSoftFloat(false),
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IsSingleFloat(false), IsFPXX(false), NoABICalls(false), Abs2008(false),
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IsFP64bit(false), UseOddSPReg(true), IsNaN2008bit(false),
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IsGP64bit(false), HasVFPU(false), HasCnMips(false), HasCnMipsP(false),
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HasMips3_32(false), HasMips3_32r2(false), HasMips4_32(false),
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HasMips4_32r2(false), HasMips5_32r2(false), InMips16Mode(false),
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InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
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HasDSPR2(false), HasDSPR3(false), AllowMixed16_32(Mixed16_32 | Mips_Os16),
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Os16(Mips_Os16), HasMSA(false), UseTCCInDIV(false), HasSym32(false),
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HasEVA(false), DisableMadd4(false), HasMT(false), HasCRC(false),
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HasVirt(false), HasGINV(false), UseIndirectJumpsHazard(false),
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StackAlignOverride(StackAlignOverride), TM(TM), TargetTriple(TT),
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TSInfo(), InstrInfo(MipsInstrInfo::create(
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initializeSubtargetDependencies(CPU, FS, TM))),
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FrameLowering(MipsFrameLowering::create(*this)),
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TLInfo(MipsTargetLowering::create(TM, *this)) {
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if (MipsArchVersion == MipsDefault)
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MipsArchVersion = Mips32;
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// Don't even attempt to generate code for MIPS-I and MIPS-V. They have not
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// been tested and currently exist for the integrated assembler only.
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if (MipsArchVersion == Mips1)
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report_fatal_error("Code generation for MIPS-I is not implemented", false);
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if (MipsArchVersion == Mips5)
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report_fatal_error("Code generation for MIPS-V is not implemented", false);
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// Check if Architecture and ABI are compatible.
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assert(((!isGP64bit() && isABI_O32()) ||
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(isGP64bit() && (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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if (isFP64bit() && !hasMips64() && hasMips32() && !hasMips32r2())
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report_fatal_error(
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"FPU with 64-bit registers is not available on MIPS32 pre revision 2. "
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"Use -mcpu=mips32r2 or greater.");
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if (!isABI_O32() && !useOddSPReg())
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report_fatal_error("-mattr=+nooddspreg requires the O32 ABI.", false);
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if (IsFPXX && (isABI_N32() || isABI_N64()))
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report_fatal_error("FPXX is not permitted for the N32/N64 ABI's.", false);
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if (hasMips64r6() && InMicroMipsMode)
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report_fatal_error("microMIPS64R6 is not supported", false);
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if (!isABI_O32() && InMicroMipsMode)
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report_fatal_error("microMIPS64 is not supported.", false);
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if (UseIndirectJumpsHazard) {
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if (InMicroMipsMode)
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report_fatal_error(
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"cannot combine indirect jumps with hazard barriers and microMIPS");
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if (!hasMips32r2())
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report_fatal_error(
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"indirect jumps with hazard barriers requires MIPS32R2 or later");
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}
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if (inAbs2008Mode() && hasMips32() && !hasMips32r2()) {
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report_fatal_error("IEEE 754-2008 abs.fmt is not supported for the given "
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"architecture.",
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false);
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}
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if (hasMips32r6()) {
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StringRef ISA = hasMips64r6() ? "MIPS64r6" : "MIPS32r6";
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assert(isFP64bit());
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assert(isNaN2008());
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assert(inAbs2008Mode());
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if (hasDSP())
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report_fatal_error(ISA + " is not compatible with the DSP ASE", false);
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}
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if (NoABICalls && TM.isPositionIndependent())
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report_fatal_error("position-independent code requires '-mabicalls'");
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if (isABI_N64() && !TM.isPositionIndependent() && !hasSym32())
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NoABICalls = true;
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// Set UseSmallSection.
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UseSmallSection = GPOpt;
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if (!NoABICalls && GPOpt) {
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errs() << "warning: cannot use small-data accesses for '-mabicalls'"
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<< "\n";
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UseSmallSection = false;
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}
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if (hasDSPR2() && !DspWarningPrinted) {
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if (hasMips64() && !hasMips64r2()) {
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errs() << "warning: the 'dspr2' ASE requires MIPS64 revision 2 or "
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<< "greater\n";
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DspWarningPrinted = true;
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} else if (hasMips32() && !hasMips32r2()) {
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errs() << "warning: the 'dspr2' ASE requires MIPS32 revision 2 or "
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<< "greater\n";
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DspWarningPrinted = true;
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}
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} else if (hasDSP() && !DspWarningPrinted) {
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if (hasMips64() && !hasMips64r2()) {
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errs() << "warning: the 'dsp' ASE requires MIPS64 revision 2 or "
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<< "greater\n";
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DspWarningPrinted = true;
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} else if (hasMips32() && !hasMips32r2()) {
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errs() << "warning: the 'dsp' ASE requires MIPS32 revision 2 or "
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<< "greater\n";
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DspWarningPrinted = true;
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}
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}
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StringRef ArchName = hasMips64() ? "MIPS64" : "MIPS32";
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if (!hasMips32r5() && hasMSA() && !MSAWarningPrinted) {
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errs() << "warning: the 'msa' ASE requires " << ArchName
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<< " revision 5 or greater\n";
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MSAWarningPrinted = true;
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}
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if (!hasMips32r5() && hasVirt() && !VirtWarningPrinted) {
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errs() << "warning: the 'virt' ASE requires " << ArchName
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<< " revision 5 or greater\n";
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VirtWarningPrinted = true;
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}
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if (!hasMips32r6() && hasCRC() && !CRCWarningPrinted) {
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errs() << "warning: the 'crc' ASE requires " << ArchName
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<< " revision 6 or greater\n";
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CRCWarningPrinted = true;
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}
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if (!hasMips32r6() && hasGINV() && !GINVWarningPrinted) {
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errs() << "warning: the 'ginv' ASE requires " << ArchName
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<< " revision 6 or greater\n";
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GINVWarningPrinted = true;
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}
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CallLoweringInfo.reset(new MipsCallLowering(*getTargetLowering()));
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Legalizer.reset(new MipsLegalizerInfo(*this));
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auto *RBI = new MipsRegisterBankInfo(*getRegisterInfo());
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RegBankInfo.reset(RBI);
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InstSelector.reset(createMipsInstructionSelector(
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*static_cast<const MipsTargetMachine *>(&TM), *this, *RBI));
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}
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bool MipsSubtarget::isPositionIndependent() const {
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return TM.isPositionIndependent();
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}
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/// This overrides the PostRAScheduler bit in the SchedModel for any CPU.
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bool MipsSubtarget::enablePostRAScheduler() const { return true; }
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void MipsSubtarget::getCriticalPathRCs(RegClassVector &CriticalPathRCs) const {
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CriticalPathRCs.clear();
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CriticalPathRCs.push_back(isGP64bit() ? &Mips::GPR64RegClass
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: &Mips::GPR32RegClass);
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}
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CodeGenOpt::Level MipsSubtarget::getOptLevelToEnablePostRAScheduler() const {
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return CodeGenOpt::Aggressive;
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}
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MipsSubtarget &
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MipsSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS,
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const TargetMachine &TM) {
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StringRef CPUName = MIPS_MC::selectMipsCPU(TM.getTargetTriple(), CPU);
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// Parse features string.
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ParseSubtargetFeatures(CPUName, /*TuneCPU*/ CPUName, FS);
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// Initialize scheduling itinerary for the specified CPU.
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InstrItins = getInstrItineraryForCPU(CPUName);
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if (InMips16Mode && !IsSoftFloat)
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InMips16HardFloat = true;
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if (StackAlignOverride)
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stackAlignment = *StackAlignOverride;
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else if (isABI_N32() || isABI_N64())
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stackAlignment = Align(16);
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else {
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assert(isABI_O32() && "Unknown ABI for stack alignment!");
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stackAlignment = Align(8);
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}
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if ((isABI_N32() || isABI_N64()) && !isGP64bit())
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report_fatal_error("64-bit code requested on a subtarget that doesn't "
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"support it!");
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return *this;
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}
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bool MipsSubtarget::useConstantIslands() {
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LLVM_DEBUG(dbgs() << "use constant islands " << Mips16ConstantIslands
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<< "\n");
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return Mips16ConstantIslands;
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}
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Reloc::Model MipsSubtarget::getRelocationModel() const {
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return TM.getRelocationModel();
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}
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bool MipsSubtarget::isABI_N64() const { return getABI().IsN64(); }
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bool MipsSubtarget::isABI_N32() const { return getABI().IsN32(); }
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bool MipsSubtarget::isABI_O32() const { return getABI().IsO32(); }
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const MipsABIInfo &MipsSubtarget::getABI() const { return TM.getABI(); }
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const CallLowering *MipsSubtarget::getCallLowering() const {
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return CallLoweringInfo.get();
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}
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const LegalizerInfo *MipsSubtarget::getLegalizerInfo() const {
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return Legalizer.get();
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}
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const RegisterBankInfo *MipsSubtarget::getRegBankInfo() const {
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return RegBankInfo.get();
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}
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InstructionSelector *MipsSubtarget::getInstructionSelector() const {
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return InstSelector.get();
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}
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