mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-30 07:22:55 +01:00
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
//===-- 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
|
|
};
|
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Instruction itinerary Data - Itinerary data supplied by a subtarget to be
|
|
// used by a target.
|
|
//
|
|
struct InstrItineraryData {
|
|
InstrStage *Stages; // Array of stages selected
|
|
InstrItinerary *Itineratries; // Array of itineraries selected
|
|
|
|
//
|
|
// Ctors.
|
|
//
|
|
InstrItineraryData() : Stages(0), Itineratries(0) {}
|
|
InstrItineraryData(InstrStage *S, InstrItinerary *I) : Stages(S), Itineratries(I) {}
|
|
|
|
//
|
|
// isEmpty - Returns true if there are no itineraries.
|
|
//
|
|
inline bool isEmpty() const { return Itineratries == 0; }
|
|
|
|
//
|
|
// begin - Return the first stage of the itinerary.
|
|
//
|
|
inline InstrStage *begin(unsigned ItinClassIndx) const {
|
|
unsigned StageIdx = Itineratries[ItinClassIndx].First;
|
|
return Stages + StageIdx;
|
|
}
|
|
|
|
//
|
|
// end - Return the last+1 stage of the itinerary.
|
|
//
|
|
inline InstrStage *end(unsigned ItinClassIndx) const {
|
|
unsigned StageIdx = Itineratries[ItinClassIndx].Last;
|
|
return Stages + StageIdx;
|
|
}
|
|
};
|
|
|
|
|
|
} // End llvm namespace
|
|
|
|
#endif
|