//===- CodeGenSchedule.cpp - Scheduling MachineModels ---------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines structures to encapsulate the machine model as decribed in
// the target description.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "subtarget-emitter"
#include "CodeGenSchedule.h"
#include "CodeGenTarget.h"
#include "llvm/TableGen/Error.h"
#include "llvm/Support/Debug.h"
using namespace llvm;
#ifndef NDEBUG
static void dumpIdxVec(const IdxVec &V) {
for (unsigned i = 0, e = V.size(); i < e; ++i) {
dbgs() << V[i] << ", ";
}
}
static void dumpIdxVec(const SmallVectorImpl<unsigned> &V) {
for (unsigned i = 0, e = V.size(); i < e; ++i) {
dbgs() << V[i] << ", ";
}
}
#endif
/// CodeGenModels ctor interprets machine model records and populates maps.
CodeGenSchedModels::CodeGenSchedModels(RecordKeeper &RK,
const CodeGenTarget &TGT):
Records(RK), Target(TGT), NumItineraryClasses(0) {
// Instantiate a CodeGenProcModel for each SchedMachineModel with the values
// that are explicitly referenced in tablegen records. Resources associated
// with each processor will be derived later. Populate ProcModelMap with the
// CodeGenProcModel instances.
collectProcModels();
// Instantiate a CodeGenSchedRW for each SchedReadWrite record explicitly
// defined, and populate SchedReads and SchedWrites vectors. Implicit
// SchedReadWrites that represent sequences derived from expanded variant will
// be inferred later.
collectSchedRW();
// Instantiate a CodeGenSchedClass for each unique SchedRW signature directly
// required by an instruction definition, and populate SchedClassIdxMap. Set
// NumItineraryClasses to the number of explicit itinerary classes referenced
// by instructions. Set NumInstrSchedClasses to the number of itinerary
// classes plus any classes implied by instructions that derive from class
// Sched and provide SchedRW list. This does not infer any new classes from
// SchedVariant.
collectSchedClasses();
// Find instruction itineraries for each processor. Sort and populate
// CodeGenProcMode::ItinDefList. (Cycle-to-cycle itineraries). This requires
