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subtarget CPU descriptions and support new features of MachineScheduler. MachineModel has three categories of data: 1) Basic properties for coarse grained instruction cost model. 2) Scheduler Read/Write resources for simple per-opcode and operand cost model (TBD). 3) Instruction itineraties for detailed per-cycle reservation tables. These will all live side-by-side. Any subtarget can use any combination of them. Instruction itineraries will not change in the near term. In the long run, I expect them to only be relevant for in-order VLIW machines that have complex contraints and require a precise scheduling/bundling model. Once itineraries are only actively used by VLIW-ish targets, they could be replaced by something more appropriate for those targets. This tablegen backend rewrite sets things up for introducing MachineModel type #2: per opcode/operand cost model. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159891 91177308-0d34-0410-b5e6-96231b3b80d8
104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
//===-- MCSubtargetInfo.cpp - 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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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/MC/MCInstrItineraries.h"
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#include "llvm/MC/SubtargetFeature.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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using namespace llvm;
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MCSchedModel MCSchedModel::DefaultSchedModel; // For unknown processors.
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void
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MCSubtargetInfo::InitMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS,
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const SubtargetFeatureKV *PF,
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const SubtargetFeatureKV *PD,
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const SubtargetInfoKV *ProcSched,
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const InstrStage *IS,
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const unsigned *OC,
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const unsigned *FP,
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unsigned NF, unsigned NP) {
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TargetTriple = TT;
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ProcFeatures = PF;
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ProcDesc = PD;
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ProcSchedModel = ProcSched;
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Stages = IS;
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OperandCycles = OC;
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ForwardingPaths = FP;
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NumFeatures = NF;
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NumProcs = NP;
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SubtargetFeatures Features(FS);
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FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
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ProcFeatures, NumFeatures);
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}
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/// ReInitMCSubtargetInfo - Change CPU (and optionally supplemented with
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/// feature string) and recompute feature bits.
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uint64_t MCSubtargetInfo::ReInitMCSubtargetInfo(StringRef CPU, StringRef FS) {
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SubtargetFeatures Features(FS);
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FeatureBits = Features.getFeatureBits(CPU, ProcDesc, NumProcs,
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ProcFeatures, NumFeatures);
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return FeatureBits;
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}
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/// ToggleFeature - Toggle a feature and returns the re-computed feature
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/// bits. This version does not change the implied bits.
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uint64_t MCSubtargetInfo::ToggleFeature(uint64_t FB) {
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FeatureBits ^= FB;
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return FeatureBits;
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}
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/// ToggleFeature - Toggle a feature and returns the re-computed feature
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/// bits. This version will also change all implied bits.
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uint64_t MCSubtargetInfo::ToggleFeature(StringRef FS) {
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SubtargetFeatures Features;
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FeatureBits = Features.ToggleFeature(FeatureBits, FS,
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ProcFeatures, NumFeatures);
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return FeatureBits;
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}
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MCSchedModel *
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MCSubtargetInfo::getSchedModelForCPU(StringRef CPU) const {
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assert(ProcSchedModel && "Processor machine model not available!");
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#ifndef NDEBUG
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for (size_t i = 1; i < NumProcs; i++) {
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assert(strcmp(ProcSchedModel[i - 1].Key, ProcSchedModel[i].Key) < 0 &&
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"Processor machine model table is not sorted");
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}
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#endif
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// Find entry
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SubtargetInfoKV KV;
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KV.Key = CPU.data();
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const SubtargetInfoKV *Found =
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std::lower_bound(ProcSchedModel, ProcSchedModel+NumProcs, KV);
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if (Found == ProcSchedModel+NumProcs || StringRef(Found->Key) != CPU) {
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errs() << "'" << CPU
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<< "' is not a recognized processor for this target"
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<< " (ignoring processor)\n";
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return &MCSchedModel::DefaultSchedModel;
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}
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assert(Found->Value && "Missing processor SchedModel value");
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return (MCSchedModel *)Found->Value;
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}
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InstrItineraryData
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MCSubtargetInfo::getInstrItineraryForCPU(StringRef CPU) const {
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MCSchedModel *SchedModel = getSchedModelForCPU(CPU);
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return InstrItineraryData(SchedModel, Stages, OperandCycles, ForwardingPaths);
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}
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