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abc9_ops: cope with T_LIMIT{,2}_{MIN,TYP,MAX} and auto-gen small LUTs

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This commit is contained in:
Eddie Hung 2020-02-13 09:48:48 -08:00
parent ccc84f8923
commit 0ed550d83c
1 changed files with 33 additions and 18 deletions
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51
passes/techmap/abc9_ops.cc
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@ -437,8 +437,10 @@ void prep_delays(RTLIL::Design *design)
int rise_max = cell->getParam(ID(T_RISE_MAX)).as_int(); int rise_max = cell->getParam(ID(T_RISE_MAX)).as_int();
int fall_max = cell->getParam(ID(T_FALL_MAX)).as_int(); int fall_max = cell->getParam(ID(T_FALL_MAX)).as_int();
int max = std::max(rise_max,fall_max); int max = std::max(rise_max,fall_max);
if (max < 0) { if (max < 0)
log_warning("Module '%s' contains specify cell '%s' with T_{RISE,FALL}_MAX < 0 which is currently unsupported. Ignoring.\n", log_id(module), log_id(cell)); log_warning("Module '%s' contains specify cell '%s' with T_{RISE,FALL}_MAX < 0 which is currently unsupported. Ignoring.\n", log_id(module), log_id(cell));
if (max <= 0) {
log_debug("Module '%s' contains specify cell '%s' with T_{RISE,FALL}_MAX <= 0 which is currently unsupported. Ignoring.\n", log_id(module), log_id(cell));
continue; continue;
} }
for (const auto &d : dst) for (const auto &d : dst)
@ -456,9 +458,11 @@ void prep_delays(RTLIL::Design *design)
for (const auto &c : dst.chunks()) for (const auto &c : dst.chunks())
if (!c.wire->port_input) if (!c.wire->port_input)
log_error("Module '%s' contains specify cell '%s' where DST '%s' is not a module input.\n", log_id(module), log_id(cell), log_signal(dst)); log_error("Module '%s' contains specify cell '%s' where DST '%s' is not a module input.\n", log_id(module), log_id(cell), log_signal(dst));
int setup = cell->getParam(ID(T_LIMIT)).as_int(); int setup = cell->getParam(ID(T_LIMIT_MAX)).as_int();
if (setup < 0) { if (setup < 0)
log_warning("Module '%s' contains specify cell '%s' with T_LIMIT < 0 which is currently unsupported. Ignoring.\n", log_id(module), log_id(cell)); log_warning("Module '%s' contains specify cell '%s' with T_LIMIT_MAX < 0 which is currently unsupported. Ignoring.\n", log_id(module), log_id(cell));
if (setup <= 0) {
log_debug("Module '%s' contains specify cell '%s' with T_LIMIT_MAX <= 0 which is currently unsupported. Ignoring.\n", log_id(module), log_id(cell));
continue; continue;
} }
for (const auto &s : src) for (const auto &s : src)
@ -582,8 +586,7 @@ void prep_delays(RTLIL::Design *design)
void prep_lut(RTLIL::Design *design, int maxlut) void prep_lut(RTLIL::Design *design, int maxlut)
{ {
std::stringstream ss; std::vector<std::tuple<int, IdString, std::vector<int>>> table;
std::vector<std::pair<int, std::string>> table;
for (auto module : design->modules()) { for (auto module : design->modules()) {
auto it = module->attributes.find(ID(abc9_lut)); auto it = module->attributes.find(ID(abc9_lut));
if (it == module->attributes.end()) if (it == module->attributes.end())
@ -603,6 +606,8 @@ void prep_lut(RTLIL::Design *design, int maxlut)
o = d; o = d;
else else
log_assert(o == d); log_assert(o == d);
// TODO: Don't assume that each specify entry with the destination 'o'
// describes a unique LUT input
int rise_max = cell->getParam(ID(T_RISE_MAX)).as_int(); int rise_max = cell->getParam(ID(T_RISE_MAX)).as_int();
int fall_max = cell->getParam(ID(T_FALL_MAX)).as_int(); int fall_max = cell->getParam(ID(T_FALL_MAX)).as_int();
int max = std::max(rise_max,fall_max); int max = std::max(rise_max,fall_max);
@ -612,20 +617,30 @@ void prep_lut(RTLIL::Design *design, int maxlut)
} }
if (maxlut && GetSize(specify) > maxlut) if (maxlut && GetSize(specify) > maxlut)
continue; continue;
std::sort(specify.begin(), specify.end()); // ABC requires ascending LUT input delays
ss.str(""); table.emplace_back(GetSize(specify), module->name, std::move(specify));
ss << "# " << module->name.str() << std::endl;
ss << GetSize(specify) << " " << it->second.as_int();
for (auto i : specify)
ss << " " << i;
ss << std::endl;
table.emplace_back(GetSize(specify), ss.str());
} }
// ABC expects ascending size // ABC requires ascending size
std::sort(table.begin(), table.end()); std::sort(table.begin(), table.end());
ss.str("");
for (auto &i : table) std::stringstream ss;
ss << i.second; const auto &first = table.front();
// If the first entry does not start from a 1-input LUT,
// (as ABC requires) crop the first entry to do so
for (int i = 1; i < std::get<0>(first); i++) {
ss << "# $__ABC9_LUT" << i << std::endl;
ss << i;
for (int j = 0; j < i; j++)
ss << " " << std::get<2>(first)[j];
ss << std::endl;
}
for (const auto &i : table) {
ss << "# " << log_id(std::get<1>(i)) << std::endl;
ss << GetSize(std::get<2>(i));
for (const auto &j : std::get<2>(i))
ss << " " << j;
ss << std::endl;
}
design->scratchpad_set_string("abc9_ops.lut_library", ss.str()); design->scratchpad_set_string("abc9_ops.lut_library", ss.str());
} }