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Annotate logic depth

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This commit is contained in:
Alain Dargelas 2025-02-05 16:45:08 -08:00
parent 47aac95f64
commit bf96f94267
3 changed files with 150 additions and 2 deletions
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20
passes/cmds/longloop_select.cc
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@ -25,6 +25,8 @@
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
typedef RTLIL::IdString::compare_ptr_by_name<RTLIL::Cell> cell_ptr_cmp;
struct LongLoopSelect : public ScriptPass {
LongLoopSelect()
: ScriptPass("longloop_select", "Selects long for-loops (Creating logic above a certain logic depth) for further optimizations")
@ -178,10 +180,26 @@ struct LongLoopSelect : public ScriptPass {
}
// For a given for-loop cell group, perform topological sorting to get the logic depth of the ending cell in
// the group
std::map<RTLIL::Cell *, int> celllevel;
for (auto cell : itrCluster->second) {
celllevel.emplace(cell, 0);
}
TopoSort<RTLIL::Cell *, RTLIL::IdString::compare_ptr_by_name<RTLIL::Cell>> toposort;
toposorting(itrCluster->second, sigmap, toposort, debug);
std::vector<Cell *>::reverse_iterator itrLastCell = toposort.sorted.rbegin();
int logicdepth = toposort.node_to_index.find((*itrLastCell))->second;
int logicdepth = 0;
std::map<RTLIL::Cell *, std::set<RTLIL::Cell *, cell_ptr_cmp>, cell_ptr_cmp> topo_cell_drivers =
toposort.get_database();
for (auto cell : toposort.sorted) {
int level = 0;
auto itrAdj = topo_cell_drivers.find(cell);
for (auto c : (*itrAdj).second) {
level = std::max(level, celllevel[c]);
}
level++;
celllevel[cell] = level;
logicdepth = std::max(logicdepth, level);
}
if (debug) {
log(" Logic depth: %d\n", logicdepth);
log_flush();