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techmap: Support dynamic cell types

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This commit is contained in:
Martin Povišer 2024-04-10 14:17:57 +02:00
parent dd2195543b
commit fc82251105
2 changed files with 9 additions and 0 deletions
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2
kernel/constids.inc
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@ -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)

7
passes/techmap/techmap.cc
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@ -337,6 +337,9 @@ 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));
vector<IdString> autopurge_ports;
for (auto &conn : c->connections())
@ -1135,6 +1138,10 @@ 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");