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techmap: Support mapping to dynamic cell types #4327

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merged 2 commits into from
May 3, 2024
Merged

techmap: Support mapping to dynamic cell types #4327

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f3f0d9b
techmap: Support dynamic cell types
povik Apr 10, 2024
d14882f
techmap: Remove `techmap_chtype` from the result
povik Apr 10, 2024
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2 changes: 2 additions & 0 deletions kernel/constids.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -222,6 +222,8 @@ X(_TECHMAP_REPLACE_)
X(techmap_simplemap)
X(_techmap_special_)
X(techmap_wrap)
X(_TECHMAP_PLACEHOLDER_)
X(techmap_chtype)
X(T_FALL_MAX)
X(T_FALL_MIN)
X(T_FALL_TYP)
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9 changes: 9 additions & 0 deletions passes/techmap/techmap.cc
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Expand Up @@ -336,6 +336,11 @@ struct TechmapWorker

if (c->type.begins_with("\\$"))
c->type = c->type.substr(1);

if (c->type == ID::_TECHMAP_PLACEHOLDER_ && tpl_cell->has_attribute(ID::techmap_chtype)) {
c->type = RTLIL::escape_id(tpl_cell->get_string_attribute(ID::techmap_chtype));
c->attributes.erase(ID::techmap_chtype);
}

vector<IdString> autopurge_ports;

Expand Down Expand Up @@ -1135,6 +1140,10 @@ struct TechmapPass : public Pass {
log("new wire alias to be created and named as above but with the `_TECHMAP_REPLACE_'\n");
log("prefix also substituted.\n");
log("\n");
log("A cell with the type _TECHMAP_PLACEHOLDER_ in the map file will have its type\n");
log("changed to the content of the techmap_chtype attribute. This allows for choosing\n");
log("the cell type dynamically.\n");
log("\n");
log("See 'help extract' for a pass that does the opposite thing.\n");
log("\n");
log("See 'help flatten' for a pass that does flatten the design (which is\n");
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