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// Copyright (c) 2009-2011, Tor M. Aamodt, Inderpreet Singh
// The University of British Columbia
// 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 University of British Columbia 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 HOLDER 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.
#include "scoreboard.h"
#include "shader.h"
#include "../cuda-sim/ptx_sim.h"
//Constructor
Scoreboard::Scoreboard( unsigned sid, unsigned n_warps )
{
m_sid = sid;
//Initialize size of table
reg_table.resize(n_warps);
}
// Print scoreboard contents
void Scoreboard::printContents() const
{
printf("scoreboard contents (sid=%d): \n", m_sid);
for(unsigned i=0; i<reg_table.size(); i++) {
if(reg_table[i].size() == 0 ) continue;
printf(" wid = %2d: ", i);
std::set<unsigned>::const_iterator it;
for( it=reg_table[i].begin() ; it != reg_table[i].end(); it++ )
printf("%u ", *it);
printf("\n");
}
}
void Scoreboard::reserveRegister(unsigned wid, unsigned regnum)
{
if( !(reg_table[wid].find(regnum) == reg_table[wid].end()) ){
printf("Error: trying to reserve an already reserved register (sid=%d, wid=%d, regnum=%d).", m_sid, wid, regnum);
abort();
}
reg_table[wid].insert(regnum);
}
// Unmark register as write-pending
void Scoreboard::releaseRegister(unsigned wid, unsigned regnum)
{
if( !(reg_table[wid].find(regnum) != reg_table[wid].end()) )
return;
reg_table[wid].erase(regnum);
}
void Scoreboard::reserveRegisters(const class warp_inst_t* inst)
{
for( unsigned r=0; r < 4; r++)
if(inst->out[r] > 0) reserveRegister(inst->warp_id(), inst->out[r]);
}
// Release registers for an instruction
void Scoreboard::releaseRegisters(const class warp_inst_t *inst)
{
for( unsigned r=0; r < 4; r++)
if(inst->out[r] > 0) releaseRegister(inst->warp_id(), inst->out[r]);
}
/**
* Checks to see if registers used by an instruction are reserved in the scoreboard
*
* @return
* true if WAW or RAW hazard (no WAR since in-order issue)
**/
bool Scoreboard::checkCollision( unsigned wid, const class inst_t *inst ) const
{
// Get list of all input and output registers
std::set<int> inst_regs;
if(inst->out[0] > 0) inst_regs.insert(inst->out[0]);
if(inst->out[1] > 0) inst_regs.insert(inst->out[1]);
if(inst->out[2] > 0) inst_regs.insert(inst->out[2]);
if(inst->out[3] > 0) inst_regs.insert(inst->out[3]);
if(inst->in[0] > 0) inst_regs.insert(inst->in[0]);
if(inst->in[1] > 0) inst_regs.insert(inst->in[1]);
if(inst->in[2] > 0) inst_regs.insert(inst->in[2]);
if(inst->in[3] > 0) inst_regs.insert(inst->in[3]);
if(inst->pred > 0) inst_regs.insert(inst->pred);
if(inst->ar1 > 0) inst_regs.insert(inst->ar1);
if(inst->ar2 > 0) inst_regs.insert(inst->ar2);
// Check for collision, get the intersection of reserved registers and instruction registers
std::set<int>::const_iterator it2;
for ( it2=inst_regs.begin() ; it2 != inst_regs.end(); it2++ )
if(reg_table[wid].find(*it2) != reg_table[wid].end()) {
return true;
}
return false;
}
bool Scoreboard::pendingWrites(unsigned wid) const
{
return !reg_table[wid].empty();
}
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