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| author | Clifford Wolf <clifford@clifford.at> | 2019-03-14 20:35:15 +0100 |
|---|---|---|
| committer | Clifford Wolf <clifford@clifford.at> | 2019-03-14 20:52:00 +0100 |
| commit | f806b95ed6a2f2c1a0e5c8884676fd384e510143 (patch) | |
| tree | d19c96dd742baaf9e5b936758f2cdf582cd796ac /passes/opt | |
| parent | 44a44a06ed0a7489d6d3500c5fddc4a122afffa0 (diff) | |
| download | yosys-f806b95ed6a2f2c1a0e5c8884676fd384e510143.tar.gz yosys-f806b95ed6a2f2c1a0e5c8884676fd384e510143.tar.bz2 yosys-f806b95ed6a2f2c1a0e5c8884676fd384e510143.zip | |
Improve handling of and-with-1 and or-with-0 in opt_expr, fixes #327
Signed-off-by: Clifford Wolf <clifford@clifford.at>
Diffstat (limited to 'passes/opt')
| -rw-r--r-- | passes/opt/opt_expr.cc | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/passes/opt/opt_expr.cc b/passes/opt/opt_expr.cc index 26a3ca7bc..a05db2a4f 100644 --- a/passes/opt/opt_expr.cc +++ b/passes/opt/opt_expr.cc @@ -155,6 +155,13 @@ bool group_cell_inputs(RTLIL::Module *module, RTLIL::Cell *cell, bool commutativ new_b.append_bit(it.first.second); } + if (cell->type.in("$and", "$or") && i == GRP_CONST_A) { + log(" Direct Connection: %s (%s with %s)\n", log_signal(new_b), log_id(cell->type), log_signal(new_a)); + module->connect(new_y, new_b); + module->connect(new_conn); + continue; + } + RTLIL::Cell *c = module->addCell(NEW_ID, cell->type); c->setPort("\\A", new_a); |