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85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
//===-- llvm/Target/TargetInstrItineraries.h - Scheduling -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the James M. Laskey and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file describes the structures used for instruction itineraries and
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// states. This is used by schedulers to determine instruction states and
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// latencies.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TARGET_TARGETINSTRITINERARIES_H
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#define LLVM_TARGET_TARGETINSTRITINERARIES_H
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namespace llvm {
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//===----------------------------------------------------------------------===//
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// Instruction stage - These values represent a step in the execution of an
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// instruction. The latency represents the number of discrete time slots used
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// need to complete the stage. Units represent the choice of functional units
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// that can be used to complete the stage. Eg. IntUnit1, IntUnit2.
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//
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struct InstrStage {
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unsigned Cycles; // Length of stage in machine cycles
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unsigned Units; // Choice of functional units
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};
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//===----------------------------------------------------------------------===//
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// Instruction itinerary - An itinerary represents a sequential series of steps
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// required to complete an instruction. Itineraries are represented as
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// sequences of instruction stages.
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//
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struct InstrItinerary {
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unsigned First; // Index of first stage in itinerary
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unsigned Last; // Index of last + 1 stage in itinerary
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};
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//===----------------------------------------------------------------------===//
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// Instruction itinerary Data - Itinerary data supplied by a subtarget to be
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// used by a target.
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//
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struct InstrItineraryData {
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InstrStage *Stages; // Array of stages selected
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InstrItinerary *Itineratries; // Array of itineraries selected
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//
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// Ctors.
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//
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InstrItineraryData() : Stages(0), Itineratries(0) {}
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InstrItineraryData(InstrStage *S, InstrItinerary *I) : Stages(S), Itineratries(I) {}
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//
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// isEmpty - Returns true if there are no itineraries.
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//
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inline bool isEmpty() const { return Itineratries == 0; }
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//
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// begin - Return the first stage of the itinerary.
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//
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inline InstrStage *begin(unsigned ItinClassIndx) const {
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unsigned StageIdx = Itineratries[ItinClassIndx].First;
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return Stages + StageIdx;
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}
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//
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// end - Return the last+1 stage of the itinerary.
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//
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inline InstrStage *end(unsigned ItinClassIndx) const {
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unsigned StageIdx = Itineratries[ItinClassIndx].Last;
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return Stages + StageIdx;
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}
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};
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} // End llvm namespace
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#endif
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