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/*
* Copyright (c) 2007 MIPS Technologies, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Authors: Korey Sewell
*
*/
#ifndef __CPU_INORDER_MULT_DIV_UNIT_HH__
#define __CPU_INORDER_MULT_DIV_UNIT_HH__
#include <list>
#include <string>
#include <vector>
#include "cpu/inorder/first_stage.hh"
#include "cpu/inorder/inorder_dyn_inst.hh"
#include "cpu/inorder/resource.hh"
#include "cpu/func_unit.hh"
#include "cpu/op_class.hh"
class MDUEvent;
class MultDivUnit : public Resource {
public:
typedef ThePipeline::DynInstPtr DynInstPtr;
enum Command {
StartMultDiv,
EndMultDiv,
MultDiv
};
public:
MultDivUnit(std::string res_name, int res_id, int res_width,
int res_latency, InOrderCPU *_cpu,
ThePipeline::Params *params);
public:
/** Override default Resource getSlot(). Will only getSlot if
* valid mult/div sequence is being maintained
*/
int getSlot(DynInstPtr inst);
void init();
/** Get Operand Size For A Division Operation */
int getDivOpSize(DynInstPtr inst);
/** Override default Resource execute */
void execute(int slot_num);
void exeMulDiv(int slot_num);
/** Register extra resource stats */
void regStats();
void requestAgain(DynInstPtr inst, bool &try_request);
void squash(DynInstPtr inst, int stage_num, InstSeqNum squash_seq_num,
ThreadID tid);
protected:
/** Latency & Repeat Rate for Multiply Insts */
unsigned multRepeatRate;
unsigned multLatency;
/** Latency & Repeat Rate for 8-bit Divide Insts */
unsigned div8RepeatRate;
unsigned div8Latency;
/** Latency & Repeat Rate for 16-bit Divide Insts */
unsigned div16RepeatRate;
unsigned div16Latency;
/** Latency & Repeat Rate for 24-bit Divide Insts */
unsigned div24RepeatRate;
unsigned div24Latency;
/** Latency & Repeat Rate for 32-bit Divide Insts */
unsigned div32RepeatRate;
unsigned div32Latency;
/** Last cycle that MDU was used */
Tick lastMDUCycle;
/** Last type of instruction MDU started processing */
OpClass lastOpType;
/** Last Division Operand of instruction MDU was processing */
uint32_t lastDivSize;
/** Last instruction name the MDU used */
std::string lastInstName;
/** Number of Multiplies */
Stats::Scalar multiplies;
/** Number of Divides */
Stats::Scalar divides;
MDUEvent *mduEvent;
};
class MDUEvent : public ResourceEvent
{
public:
MDUEvent();
~MDUEvent() { }
void process();
};
#endif //__CPU_INORDER_MULT_DIV_UNIT_HH__
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