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feat: Allow full constant wrapping for hilomap

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This commit is contained in:
Kelvin Chung 2025-02-28 19:35:47 +00:00
parent b9131853ff
commit 1113c8c95a
1 changed files with 38 additions and 15 deletions
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25
passes/techmap/hilomap.cc
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@ -26,13 +26,24 @@ PRIVATE_NAMESPACE_BEGIN
static std::string hicell_celltype, hicell_portname; static std::string hicell_celltype, hicell_portname;
static std::string locell_celltype, locell_portname; static std::string locell_celltype, locell_portname;
static std::string fullcell_celltype, fullcell_portname, fullcell_paramname;
static bool singleton_mode; static bool singleton_mode;
static bool multi_bit;
static RTLIL::Module *module; static RTLIL::Module *module;
static RTLIL::SigBit last_hi, last_lo; static RTLIL::SigBit last_hi, last_lo;
static RTLIL::SigChunk value;
void hilomap_worker(RTLIL::SigSpec &sig) 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) { for (auto &bit : sig) {
if (bit == RTLIL::State::S1 && !hicell_celltype.empty()) { if (bit == RTLIL::State::S1 && !hicell_celltype.empty()) {
if (!singleton_mode || last_hi == RTLIL::State::Sm) { if (!singleton_mode || last_hi == RTLIL::State::Sm) {
@ -52,6 +63,7 @@ void hilomap_worker(RTLIL::SigSpec &sig)
} }
} }
} }
}
struct HilomapPass : public Pass { struct HilomapPass : public Pass {
HilomapPass() : Pass("hilomap", "technology mapping of constant hi- and/or lo-drivers") { } HilomapPass() : Pass("hilomap", "technology mapping of constant hi- and/or lo-drivers") { }
@ -68,6 +80,10 @@ struct HilomapPass : public Pass {
log(" -locell <celltype> <portname>\n"); log(" -locell <celltype> <portname>\n");
log(" Replace constant lo bits with this cell.\n"); log(" Replace constant lo bits with this cell.\n");
log("\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(" -singleton\n");
log(" Create only one hi/lo cell and connect all constant bits\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"); log(" to that cell. Per default a separate cell is created for\n");
@ -83,7 +99,7 @@ struct HilomapPass : public Pass {
locell_celltype = std::string(); locell_celltype = std::string();
locell_portname = std::string(); locell_portname = std::string();
singleton_mode = false; singleton_mode = false;
multi_bit = false;
size_t argidx; size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) for (argidx = 1; argidx < args.size(); argidx++)
{ {
@ -97,6 +113,13 @@ struct HilomapPass : public Pass {
locell_portname = args[++argidx]; locell_portname = args[++argidx];
continue; 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") { if (args[argidx] == "-singleton") {
singleton_mode = true; singleton_mode = true;
continue; continue;