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//===-- llvm/Target/TargetInstrItineraries.h - Scheduling -------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the James M. Laskey and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file describes the structures used for instruction itineraries and
// states. This is used by schedulers to determine instruction states and
// latencies.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TARGET_TARGETINSTRITINERARIES_H
#define LLVM_TARGET_TARGETINSTRITINERARIES_H
namespace llvm {
//===----------------------------------------------------------------------===//
// Instruction stage - These values represent a step in the execution of an
// instruction. The latency represents the number of discrete time slots used
// need to complete the stage. Units represent the choice of functional units
// that can be used to complete the stage. Eg. IntUnit1, IntUnit2.
//
struct InstrStage {
unsigned Cycles; // Length of stage in machine cycles
unsigned Units; // Choice of functional units
};
//===----------------------------------------------------------------------===//
// Instruction itinerary - An itinerary represents a sequential series of steps
// required to complete an instruction. Itineraries are represented as
// sequences of instruction stages.
//
struct InstrItinerary {
unsigned First; // Index of first stage in itinerary
unsigned Last; // Index of last + 1 stage in itinerary
};
} // End llvm namespace
#endif
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