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Added API for generic cell cost calculations

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This commit is contained in:
Clifford Wolf 2014-10-09 13:59:26 +02:00
parent 1007f54235
commit fea11f0fa4
2 changed files with 100 additions and 15 deletions
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84
kernel/cost.h Normal file
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@ -0,0 +1,84 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#ifndef COST_H
#define COST_H
#include <kernel/yosys.h>
YOSYS_NAMESPACE_BEGIN
int get_cell_cost(RTLIL::Cell *cell, std::map<RTLIL::Module*, int> *mod_cost_cache = nullptr);
int get_cell_cost(RTLIL::IdString type, const std::map<RTLIL::IdString, RTLIL::Const> &parameters = std::map<RTLIL::IdString, RTLIL::Const>(),
RTLIL::Design *design = nullptr, std::map<RTLIL::Module*, int> *mod_cost_cache = nullptr)
{
static std::map<RTLIL::IdString, int> gate_cost = {
{ "$_BUF_", 1 },
{ "$_NOT_", 2 },
{ "$_AND_", 4 },
{ "$_NAND_", 4 },
{ "$_OR_", 4 },
{ "$_NOR_", 4 },
{ "$_XOR_", 8 },
{ "$_XNOR_", 8 },
{ "$_AOI3_", 6 },
{ "$_OAI3_", 6 },
{ "$_AOI4_", 8 },
{ "$_OAI4_", 8 },
{ "$_MUX_", 4 }
};
if (gate_cost.count(type))
return gate_cost.at(type);
if (parameters.empty() && design && design->module(type))
{
RTLIL::Module *mod = design->module(type);
if (mod->attributes.count("\\cost"))
return mod->attributes.at("\\cost").as_int();
std::map<RTLIL::Module*, int> local_mod_cost_cache;
if (mod_cost_cache == nullptr)
mod_cost_cache = &local_mod_cost_cache;
if (mod_cost_cache->count(mod))
return mod_cost_cache->at(mod);
int module_cost = 1;
for (auto c : mod->cells())
module_cost += get_cell_cost(c, mod_cost_cache);
(*mod_cost_cache)[mod] = module_cost;
return module_cost;
}
log("Warning: Can't determine cost of %s cell (%d parameters).\n", log_id(type), SIZE(parameters));
return 1;
}
int get_cell_cost(RTLIL::Cell *cell, std::map<RTLIL::Module*, int> *mod_cost_cache)
{
return get_cell_cost(cell->type, cell->parameters, cell->module->design, mod_cost_cache);
}
YOSYS_NAMESPACE_END
#endif

31
passes/abc/abc.cc
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@ -41,6 +41,7 @@
#include "kernel/register.h"
#include "kernel/sigtools.h"
#include "kernel/cost.h"
#include "kernel/log.h"
#include <unistd.h>
#include <stdlib.h>
@ -719,21 +720,21 @@ static void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std
f = fopen(p, "wt");
if (f == NULL)
log_error("Opening %s for writing failed: %s\n", p, strerror(errno));
fprintf(f, "GATE ZERO 1 Y=CONST0;\n");
fprintf(f, "GATE ONE 1 Y=CONST1;\n");
fprintf(f, "GATE BUF 1 Y=A; PIN * NONINV 1 999 1 0 1 0\n");
fprintf(f, "GATE NOT 1 Y=!A; PIN * INV 1 999 1 0 1 0\n");
fprintf(f, "GATE AND 1 Y=A*B; PIN * NONINV 1 999 1 0 1 0\n");
fprintf(f, "GATE NAND 1 Y=!(A*B); PIN * INV 1 999 1 0 1 0\n");
fprintf(f, "GATE OR 1 Y=A+B; PIN * NONINV 1 999 1 0 1 0\n");
fprintf(f, "GATE NOR 1 Y=!(A+B); PIN * INV 1 999 1 0 1 0\n");
fprintf(f, "GATE XOR 1 Y=(A*!B)+(!A*B); PIN * UNKNOWN 1 999 1 0 1 0\n");
fprintf(f, "GATE XNOR 1 Y=(A*B)+(!A*!B); PIN * UNKNOWN 1 999 1 0 1 0\n");
fprintf(f, "GATE MUX 1 Y=(A*B)+(S*B)+(!S*A); PIN * UNKNOWN 1 999 1 0 1 0\n");
fprintf(f, "GATE AOI3 1 Y=!((A*B)+C); PIN * INV 1 999 1 0 1 0\n");
fprintf(f, "GATE OAI3 1 Y=!((A+B)*C); PIN * INV 1 999 1 0 1 0\n");
fprintf(f, "GATE AOI4 1 Y=!((A*B)+(C*D)); PIN * INV 1 999 1 0 1 0\n");
fprintf(f, "GATE OAI4 1 Y=!((A+B)*(C+D)); PIN * INV 1 999 1 0 1 0\n");
fprintf(f, "GATE ZERO 1 Y=CONST0;\n");
fprintf(f, "GATE ONE 1 Y=CONST1;\n");
fprintf(f, "GATE BUF %d Y=A; PIN * NONINV 1 999 1 0 1 0\n", get_cell_cost("$_BUF_"));
fprintf(f, "GATE NOT %d Y=!A; PIN * INV 1 999 1 0 1 0\n", get_cell_cost("$_NOT_"));
fprintf(f, "GATE AND %d Y=A*B; PIN * NONINV 1 999 1 0 1 0\n", get_cell_cost("$_AND_"));
fprintf(f, "GATE NAND %d Y=!(A*B); PIN * INV 1 999 1 0 1 0\n", get_cell_cost("$_NAND_"));
fprintf(f, "GATE OR %d Y=A+B; PIN * NONINV 1 999 1 0 1 0\n", get_cell_cost("$_OR_"));
fprintf(f, "GATE NOR %d Y=!(A+B); PIN * INV 1 999 1 0 1 0\n", get_cell_cost("$_NOR_"));
fprintf(f, "GATE XOR %d Y=(A*!B)+(!A*B); PIN * UNKNOWN 1 999 1 0 1 0\n", get_cell_cost("$_XOR_"));
fprintf(f, "GATE XNOR %d Y=(A*B)+(!A*!B); PIN * UNKNOWN 1 999 1 0 1 0\n", get_cell_cost("$_XNOR_"));
fprintf(f, "GATE AOI3 %d Y=!((A*B)+C); PIN * INV 1 999 1 0 1 0\n", get_cell_cost("$_AOI3_"));
fprintf(f, "GATE OAI3 %d Y=!((A+B)*C); PIN * INV 1 999 1 0 1 0\n", get_cell_cost("$_OAI3_"));
fprintf(f, "GATE AOI4 %d Y=!((A*B)+(C*D)); PIN * INV 1 999 1 0 1 0\n", get_cell_cost("$_AOI4_"));
fprintf(f, "GATE OAI4 %d Y=!((A+B)*(C+D)); PIN * INV 1 999 1 0 1 0\n", get_cell_cost("$_OAI4_"));
fprintf(f, "GATE MUX %d Y=(A*B)+(S*B)+(!S*A); PIN * UNKNOWN 1 999 1 0 1 0\n", get_cell_cost("$_MUX_"));
fclose(f);
free(p);