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//===- MCSubtargetInfo.cpp - Subtarget Information ------------------------===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/MC/MCSchedule.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cassert>
#include <cstring>
using namespace llvm;
static FeatureBitset getFeatures(StringRef CPU, StringRef FS,
ArrayRef<SubtargetFeatureKV> ProcDesc,
ArrayRef<SubtargetFeatureKV> ProcFeatures) {
SubtargetFeatures Features(FS);
return Features.getFeatureBits(CPU, ProcDesc, ProcFeatures);
void MCSubtargetInfo::InitMCProcessorInfo(StringRef CPU, StringRef FS) {
FeatureBits = getFeatures(CPU, FS, ProcDesc, ProcFeatures);
if (!CPU.empty())
CPUSchedModel = &getSchedModelForCPU(CPU);
CPUSchedModel = &MCSchedModel::GetDefaultSchedModel();
void MCSubtargetInfo::setDefaultFeatures(StringRef CPU, StringRef FS) {
FeatureBits = getFeatures(CPU, FS, ProcDesc, ProcFeatures);
const Triple &TT, StringRef C, StringRef FS,
ArrayRef<SubtargetFeatureKV> PF, ArrayRef<SubtargetFeatureKV> PD,
const SubtargetInfoKV *ProcSched, const MCWriteProcResEntry *WPR,
const MCWriteLatencyEntry *WL, const MCReadAdvanceEntry *RA,
const InstrStage *IS, const unsigned *OC, const unsigned *FP)
: TargetTriple(TT), CPU(C), ProcFeatures(PF), ProcDesc(PD),
ProcSchedModels(ProcSched), WriteProcResTable(WPR), WriteLatencyTable(WL),
ReadAdvanceTable(RA), Stages(IS), OperandCycles(OC), ForwardingPaths(FP) {
InitMCProcessorInfo(CPU, FS);
/// ToggleFeature - Toggle a feature and returns the re-computed feature
/// bits. This version does not change the implied bits.
FeatureBitset MCSubtargetInfo::ToggleFeature(uint64_t FB) {
return FeatureBits;
FeatureBitset MCSubtargetInfo::ToggleFeature(const FeatureBitset &FB) {
FeatureBits ^= FB;
return FeatureBits;
/// ToggleFeature - Toggle a feature and returns the re-computed feature
/// bits. This version will also change all implied bits.
FeatureBitset MCSubtargetInfo::ToggleFeature(StringRef FS) {
SubtargetFeatures::ToggleFeature(FeatureBits, FS, ProcFeatures);
return FeatureBits;
FeatureBitset MCSubtargetInfo::ApplyFeatureFlag(StringRef FS) {
SubtargetFeatures::ApplyFeatureFlag(FeatureBits, FS, ProcFeatures);
return FeatureBits;
bool MCSubtargetInfo::checkFeatures(StringRef FS) const {
SubtargetFeatures T(FS);
FeatureBitset Set, All;
for (std::string F : T.getFeatures()) {
SubtargetFeatures::ApplyFeatureFlag(Set, F, ProcFeatures);
if (F[0] == '-')
F[0] = '+';
SubtargetFeatures::ApplyFeatureFlag(All, F, ProcFeatures);
return (FeatureBits & All) == Set;
const MCSchedModel &MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {
assert(ProcSchedModels && "Processor machine model not available!");
ArrayRef<SubtargetInfoKV> SchedModels(ProcSchedModels, ProcDesc.size());
assert(std::is_sorted(SchedModels.begin(), SchedModels.end(),
[](const SubtargetInfoKV &LHS, const SubtargetInfoKV &RHS) {
return strcmp(LHS.Key, RHS.Key) < 0;
}) &&
"Processor machine model table is not sorted");
// Find entry
auto Found =
std::lower_bound(SchedModels.begin(), SchedModels.end(), CPU);
if (Found == SchedModels.end() || StringRef(Found->Key) != CPU) {
if (CPU != "help") // Don't error if the user asked for help.
errs() << "'" << CPU
<< "' is not a recognized processor for this target"
<< " (ignoring processor)\n";
return MCSchedModel::GetDefaultSchedModel();
assert(Found->Value && "Missing processor SchedModel value");
return *(const MCSchedModel *)Found->Value;
MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
const MCSchedModel &SchedModel = getSchedModelForCPU(CPU);
return InstrItineraryData(SchedModel, Stages, OperandCycles, ForwardingPaths);
/// Initialize an InstrItineraryData instance.
void MCSubtargetInfo::initInstrItins(InstrItineraryData &InstrItins) const {
InstrItins = InstrItineraryData(getSchedModel(), Stages, OperandCycles,