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authorClifford Wolf <clifford@clifford.at>2013-09-15 13:33:33 +0200
committerClifford Wolf <clifford@clifford.at>2013-09-15 13:33:33 +0200
commitdc767d4e4cc514e922b2f829b16748a2ee646c85 (patch)
treecada3a6c2a4fe3a9286fbf1e72284ee1530d3f82 /backends/blif/blif.cc
parent0ec5542ab47fe5a69258f9101fa491ccd2881c1e (diff)
Added additional options to BLIF backend
Diffstat (limited to 'backends/blif/blif.cc')
-rw-r--r--backends/blif/blif.cc75
1 files changed, 60 insertions, 15 deletions
diff --git a/backends/blif/blif.cc b/backends/blif/blif.cc
index fb1e3b7b..dfc3c868 100644
--- a/backends/blif/blif.cc
+++ b/backends/blif/blif.cc
@@ -29,14 +29,25 @@
#include <string>
#include <assert.h>
+struct BlifDumperConfig
+{
+ bool subckt_mode;
+ bool conn_mode;
+ bool impltf_mode;
+
+ BlifDumperConfig() : subckt_mode(false), conn_mode(false), impltf_mode(false) { }
+};
+
struct BlifDumper
{
FILE *f;
RTLIL::Module *module;
RTLIL::Design *design;
+ BlifDumperConfig *config;
CellTypes ct;
- BlifDumper(FILE *f, RTLIL::Module *module, RTLIL::Design *design) : f(f), module(module), design(design), ct(design)
+ BlifDumper(FILE *f, RTLIL::Module *module, RTLIL::Design *design, BlifDumperConfig *config) :
+ f(f), module(module), design(design), config(config), ct(design)
{
}
@@ -103,51 +114,53 @@ struct BlifDumper
}
fprintf(f, "\n");
- fprintf(f, ".names $false\n");
- fprintf(f, ".names $true\n1\n");
+ if (!config->impltf_mode) {
+ fprintf(f, ".names $false\n");
+ fprintf(f, ".names $true\n1\n");
+ }
for (auto &cell_it : module->cells)
{
RTLIL::Cell *cell = cell_it.second;
- if (cell->type == "$_INV_") {
+ if (!config->subckt_mode && cell->type == "$_INV_") {
fprintf(f, ".names %s %s\n0 1\n",
cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\Y")));
continue;
}
- if (cell->type == "$_AND_") {
+ if (!config->subckt_mode && cell->type == "$_AND_") {
fprintf(f, ".names %s %s %s\n11 1\n",
cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")), cstr(cell->connections.at("\\Y")));
continue;
}
- if (cell->type == "$_OR_") {
+ if (!config->subckt_mode && cell->type == "$_OR_") {
fprintf(f, ".names %s %s %s\n1- 1\n-1 1\n",
cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")), cstr(cell->connections.at("\\Y")));
continue;
}
- if (cell->type == "$_XOR_") {
+ if (!config->subckt_mode && cell->type == "$_XOR_") {
fprintf(f, ".names %s %s %s\n10 1\n01 1\n",
cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")), cstr(cell->connections.at("\\Y")));
continue;
}
- if (cell->type == "$_MUX_") {
+ if (!config->subckt_mode && cell->type == "$_MUX_") {
fprintf(f, ".names %s %s %s %s\n1-0 1\n-11 1\n",
cstr(cell->connections.at("\\A")), cstr(cell->connections.at("\\B")),
cstr(cell->connections.at("\\S")), cstr(cell->connections.at("\\Y")));
continue;
}
- if (cell->type == "$_DFF_N_") {
+ if (!config->subckt_mode && cell->type == "$_DFF_N_") {
fprintf(f, ".latch %s %s fe %s\n",
cstr(cell->connections.at("\\D")), cstr(cell->connections.at("\\Q")), cstr(cell->connections.at("\\C")));
continue;
}
- if (cell->type == "$_DFF_P_") {
+ if (!config->subckt_mode && cell->type == "$_DFF_P_") {
fprintf(f, ".latch %s %s re %s\n",
cstr(cell->connections.at("\\D")), cstr(cell->connections.at("\\Q")), cstr(cell->connections.at("\\C")));
continue;
@@ -167,14 +180,17 @@ struct BlifDumper
for (auto &conn : module->connections)
for (int i = 0; i < conn.first.width; i++)
- fprintf(f, ".names %s %s\n1 1\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1)));
+ if (config->conn_mode)
+ fprintf(f, ".conn %s %s\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1)));
+ else
+ fprintf(f, ".names %s %s\n1 1\n", cstr(conn.second.extract(i, 1)), cstr(conn.first.extract(i, 1)));
fprintf(f, ".end\n");
}
- static void dump(FILE *f, RTLIL::Module *module, RTLIL::Design *design)
+ static void dump(FILE *f, RTLIL::Module *module, RTLIL::Design *design, BlifDumperConfig &config)
{
- BlifDumper dumper(f, module, design);
+ BlifDumper dumper(f, module, design, &config);
dumper.dump();
}
};
@@ -192,10 +208,27 @@ struct BlifBackend : public Backend {
log(" -top top_module\n");
log(" set the specified module as design top module\n");
log("\n");
+ log("\n");
+ log("The following options can be usefull when the generated file is not going to be\n");
+ log("read by a BLIF parser but a custom tool. It is recommended to not name the output\n");
+ log("file *.blif when any of this options is used.\n");
+ log("\n");
+ log(" -subckt\n");
+ log(" do not translate Yosys's internal gates to generic BLIF logic\n");
+ log(" functions. Instead create .subckt lines for for all cells.\n");
+ log("\n");
+ log(" -conn\n");
+ log(" do not generate buffers for connected wires. instead use the\n");
+ log(" non-standard .conn statement.\n");
+ log("\n");
+ log(" -impltf\n");
+ log(" do not write definitions for the $true and $false wires.\n");
+ log("\n");
}
virtual void execute(FILE *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design)
{
std::string top_module_name;
+ BlifDumperConfig config;
log_header("Executing BLIF backend.\n");
@@ -206,6 +239,18 @@ struct BlifBackend : public Backend {
top_module_name = args[++argidx];
continue;
}
+ if (args[argidx] == "-subckt") {
+ config.subckt_mode = true;
+ continue;
+ }
+ if (args[argidx] == "-conn") {
+ config.conn_mode = true;
+ continue;
+ }
+ if (args[argidx] == "-impltf") {
+ config.impltf_mode = true;
+ continue;
+ }
break;
}
extra_args(f, filename, args, argidx);
@@ -224,7 +269,7 @@ struct BlifBackend : public Backend {
log_error("Found munmapped emories in module %s: unmapped memories are not supported in BLIF backend!\n", RTLIL::id2cstr(module->name));
if (module->name == RTLIL::escape_id(top_module_name)) {
- BlifDumper::dump(f, module, design);
+ BlifDumper::dump(f, module, design, config);
top_module_name.clear();
continue;
}
@@ -236,7 +281,7 @@ struct BlifBackend : public Backend {
log_error("Can't find top module `%s'!\n", top_module_name.c_str());
for (auto module : mod_list)
- BlifDumper::dump(f, module, design);
+ BlifDumper::dump(f, module, design, config);
}
} BlifBackend;