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abc9_ops: Also derive blackboxes with timing info 

Signed-off-by: gatecat <gatecat@ds0.me>
This commit is contained in:
gatecat 2022-03-24 14:34:34 +00:00
parent 6318db6152
commit 8b64dc1dce
1 changed files with 10 additions and 5 deletions
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15
passes/techmap/abc9_ops.cc
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@ -167,10 +167,6 @@ void prep_hier(RTLIL::Design *design, bool dff_mode)
derived_module = inst_module; derived_module = inst_module;
} }
else { else {
// Check potential for any one of those three
// (since its value may depend on a parameter, but not its existence)
if (!inst_module->has_attribute(ID::abc9_flop) && !inst_module->has_attribute(ID::abc9_box) && !inst_module->get_bool_attribute(ID::abc9_bypass))
continue;
derived_type = inst_module->derive(design, cell->parameters); derived_type = inst_module->derive(design, cell->parameters);
derived_module = design->module(derived_type); derived_module = design->module(derived_type);
} }
@ -180,7 +176,16 @@ void prep_hier(RTLIL::Design *design, bool dff_mode)
continue; continue;
} }
else { else {
if (!derived_module->get_bool_attribute(ID::abc9_box) && !derived_module->get_bool_attribute(ID::abc9_bypass)) { bool has_timing = false;
for (auto derived_cell : derived_module->cells()) {
if (derived_cell->type.in(ID($specify2), ID($specify3), ID($specrule))) {
// If the module contains timing; then we potentially care about deriving its content too,
// as timings (or associated port widths) could be dependent on parameters.
has_timing = true;
break;
}
}
if (!derived_module->get_bool_attribute(ID::abc9_box) && !derived_module->get_bool_attribute(ID::abc9_bypass) && !has_timing) {
if (unmap_design->module(derived_type)) { if (unmap_design->module(derived_type)) {
// If derived_type is present in unmap_design, it means that it was processed previously, but found to be incompatible -- e.g. if // If derived_type is present in unmap_design, it means that it was processed previously, but found to be incompatible -- e.g. if
// it contained a non-zero initial state. In this case, continue to replace the cell type/parameters so that it has the same properties // it contained a non-zero initial state. In this case, continue to replace the cell type/parameters so that it has the same properties