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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/StringRef.h"
#include "llvm/ADT/Triple.h"
#include "llvm/MC/MCInstrItineraries.h"
#include "llvm/MC/SubtargetFeature.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace llvm;
MCSchedModel MCSchedModel::DefaultSchedModel; // For unknown processors.
/// InitMCProcessorInfo - Set or change the CPU (optionally supplemented
/// with feature string). Recompute feature bits and scheduling model.
void
MCSubtargetInfo::InitMCProcessorInfo(StringRef CPU, StringRef FS) {
SubtargetFeatures Features(FS);
FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
ProcFeatures, NumFeatures);
if (!CPU.empty())
CPUSchedModel = getSchedModelForCPU(CPU);
else
CPUSchedModel = &MCSchedModel::DefaultSchedModel;
}
void
MCSubtargetInfo::InitMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS,
const SubtargetFeatureKV *PF,
const SubtargetFeatureKV *PD,
const SubtargetInfoKV *ProcSched,
const MCWriteProcResEntry *WPR,
const MCWriteLatencyEntry *WL,
const MCReadAdvanceEntry *RA,
const InstrStage *IS,
const unsigned *OC,
const unsigned *FP,
unsigned NF, unsigned NP) {
TargetTriple = TT;
ProcFeatures = PF;
ProcDesc = PD;
ProcSchedModels = ProcSched;
WriteProcResTable = WPR;
WriteLatencyTable = WL;
ReadAdvanceTable = RA;
Stages = IS;
OperandCycles = OC;
ForwardingPaths = FP;
NumFeatures = NF;
NumProcs = NP;
InitMCProcessorInfo(CPU, FS);
}
/// ToggleFeature - Toggle a feature and returns the re-computed feature
/// bits. This version does not change the implied bits.
uint64_t MCSubtargetInfo::ToggleFeature(uint64_t FB) {
FeatureBits ^= FB;
return FeatureBits;
}
/// ToggleFeature - Toggle a feature and returns the re-computed feature
/// bits. This version will also change all implied bits.
uint64_t MCSubtargetInfo::ToggleFeature(StringRef FS) {
SubtargetFeatures Features;
FeatureBits = Features.ToggleFeature(FeatureBits, FS,
ProcFeatures, NumFeatures);
return FeatureBits;
}
const MCSchedModel *
MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {
assert(ProcSchedModels && "Processor machine model not available!");
#ifndef NDEBUG
for (size_t i = 1; i < NumProcs; i++) {
assert(strcmp(ProcSchedModels[i - 1].Key, ProcSchedModels[i].Key) < 0 &&
"Processor machine model table is not sorted");
}
#endif
// Find entry
SubtargetInfoKV KV;
KV.Key = CPU.data();
const SubtargetInfoKV *Found =
std::lower_bound(ProcSchedModels, ProcSchedModels+NumProcs, KV);
if (Found == ProcSchedModels+NumProcs || StringRef(Found->Key) != CPU) {
errs() << "'" << CPU
<< "' is not a recognized processor for this target"
<< " (ignoring processor)\n";
return &MCSchedModel::DefaultSchedModel;
}
assert(Found->Value && "Missing processor SchedModel value");
return (const MCSchedModel *)Found->Value;
}
InstrItineraryData
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(CPUSchedModel, Stages, OperandCycles, ForwardingPaths);
}
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