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Move implementation to constmap and add test

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This commit is contained in:
Kelvin Chung 2025-03-26 11:52:55 +00:00
parent 1113c8c95a
commit 7bbdf6049a
4 changed files with 129 additions and 38 deletions
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1
passes/techmap/Makefile.inc
View file

@ -53,6 +53,7 @@ OBJS += passes/techmap/flowmap.o
OBJS += passes/techmap/extractinv.o
OBJS += passes/techmap/cellmatch.o
OBJS += passes/techmap/clockgate.o
OBJS += passes/techmap/constmap.o
endif
ifeq ($(DISABLE_SPAWN),0)

82
passes/techmap/constmap.cc Normal file
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@ -0,0 +1,82 @@
/*
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2025 King Lok Chung <king.chung@manchester.ac.uk>
*
* 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.
*
*/
#include "kernel/register.h"
#include "kernel/rtlil.h"
#include "kernel/log.h"
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
static std::string celltype, cell_portname, cell_paramname;
static RTLIL::Module *module;
static RTLIL::SigChunk value;
void constmap_worker(RTLIL::SigSpec &sig)
{
if (sig.is_fully_const()){
value = module->addWire(NEW_ID, sig.size());
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(celltype));
cell->setParam(RTLIL::escape_id(cell_paramname), sig.as_const());
cell->setPort(RTLIL::escape_id(cell_portname), value);
sig = value;
}
}
struct ConstmapPass : public Pass {
ConstmapPass() : Pass("constmap", "technology mapping of coarse constant value") { }
void help() override
{
log("\n");
log(" constmap [options] [selection]\n");
log("\n");
log("Map constants to a driver cell.\n");
log("\n");
log(" -cell <celltype> <portname> <paramname>\n");
log(" Replace constant bits with this cell.\n");
log(" The value of the constant will be stored to the parameter specified.\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
{
log_header(design, "Executing CONSTMAP pass (mapping to constant driver).\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-cell" && argidx+3 < args.size()){
celltype = args[++argidx];
cell_portname = args[++argidx];
cell_paramname = args[++argidx];
continue;
}
break;
}
extra_args(args, argidx, design);
for (auto mod : design->selected_modules())
{
module = mod;
module->rewrite_sigspecs(constmap_worker);
}
}
} HilomapPass;
PRIVATE_NAMESPACE_END

53
passes/techmap/hilomap.cc
View file

@ -26,41 +26,29 @@ PRIVATE_NAMESPACE_BEGIN
static std::string hicell_celltype, hicell_portname;
static std::string locell_celltype, locell_portname;
static std::string fullcell_celltype, fullcell_portname, fullcell_paramname;
static bool singleton_mode;
static bool multi_bit;
static RTLIL::Module *module;
static RTLIL::SigBit last_hi, last_lo;
static RTLIL::SigChunk value;
void hilomap_worker(RTLIL::SigSpec &sig)
{
if (multi_bit && sig.is_fully_const()){
value = module->addWire(NEW_ID, sig.size());
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(fullcell_celltype));
cell->setParam(RTLIL::escape_id(fullcell_paramname), sig.as_const());
cell->setPort(RTLIL::escape_id(fullcell_portname), value);
sig = value;
}
else{
for (auto &bit : sig) {
if (bit == RTLIL::State::S1 && !hicell_celltype.empty()) {
if (!singleton_mode || last_hi == RTLIL::State::Sm) {
last_hi = module->addWire(NEW_ID);
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(hicell_celltype));
cell->setPort(RTLIL::escape_id(hicell_portname), last_hi);
}
bit = last_hi;
for (auto &bit : sig) {
if (bit == RTLIL::State::S1 && !hicell_celltype.empty()) {
if (!singleton_mode || last_hi == RTLIL::State::Sm) {
last_hi = module->addWire(NEW_ID);
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(hicell_celltype));
cell->setPort(RTLIL::escape_id(hicell_portname), last_hi);
}
if (bit == RTLIL::State::S0 && !locell_celltype.empty()) {
if (!singleton_mode || last_lo == RTLIL::State::Sm) {
last_lo = module->addWire(NEW_ID);
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(locell_celltype));
cell->setPort(RTLIL::escape_id(locell_portname), last_lo);
}
bit = last_lo;
bit = last_hi;
}
if (bit == RTLIL::State::S0 && !locell_celltype.empty()) {
if (!singleton_mode || last_lo == RTLIL::State::Sm) {
last_lo = module->addWire(NEW_ID);
RTLIL::Cell *cell = module->addCell(NEW_ID, RTLIL::escape_id(locell_celltype));
cell->setPort(RTLIL::escape_id(locell_portname), last_lo);
}
bit = last_lo;
}
}
}
@ -80,10 +68,6 @@ struct HilomapPass : public Pass {
log(" -locell <celltype> <portname>\n");
log(" Replace constant lo bits with this cell.\n");
log("\n");
log(" -wrap <celltype> <portname> <paramname>\n");
log(" Replace constant bits with this cell.\n");
log(" The value of the constant will be stored to the parameter specified.\n");
log("\n");
log(" -singleton\n");
log(" Create only one hi/lo cell and connect all constant bits\n");
log(" to that cell. Per default a separate cell is created for\n");
@ -99,7 +83,7 @@ struct HilomapPass : public Pass {
locell_celltype = std::string();
locell_portname = std::string();
singleton_mode = false;
multi_bit = false;
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
@ -113,13 +97,6 @@ struct HilomapPass : public Pass {
locell_portname = args[++argidx];
continue;
}
if (args[argidx] == "-wrap" && argidx+3 < args.size()){
fullcell_celltype = args[++argidx];
fullcell_portname = args[++argidx];
fullcell_paramname = args[++argidx];
multi_bit = true;
continue;
}
if (args[argidx] == "-singleton") {
singleton_mode = true;
continue;

31
tests/techmap/constmap.ys Normal file
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@ -0,0 +1,31 @@
read_verilog << EOT
module test();
wire [31:0] in;
wire [31:0] out;
assign out = in + 16;
endmodule
EOT
constmap -cell const_cell O value
select -assert-count 1 t:const_cell
select -assert-count 1 r:value=16
design -reset
read_verilog << EOT
module test();
wire [31:0] in;
wire [31:0] out1;
wire [31:0] out2;
assign out1 = in + 16;
assign out2 = in + 32;
endmodule
EOT
constmap -cell const_cell O value
select -assert-count 2 t:const_cell
select -assert-count 1 r:value=16
select -assert-count 1 r:value=32