diff options
Diffstat (limited to 'passes/proc/proc_mux.cc')
| -rw-r--r-- | passes/proc/proc_mux.cc | 20 |
1 files changed, 3 insertions, 17 deletions
diff --git a/passes/proc/proc_mux.cc b/passes/proc/proc_mux.cc index bac2dc2cd..6ac59bfb2 100644 --- a/passes/proc/proc_mux.cc +++ b/passes/proc/proc_mux.cc @@ -360,23 +360,9 @@ RTLIL::SigSpec signal_to_mux_tree(RTLIL::Module *mod, SnippetSwCache &swcache, d } } - // Transform into a $shiftx where possible - if (shiftx && last_mux_cell && last_mux_cell->type == "$pmux") { - // Create bit-blasted $shiftx-es that shifts by the address line used in the case statement - auto pmux_b_port = last_mux_cell->getPort("\\B"); - auto pmux_y_port = last_mux_cell->getPort("\\Y"); - int width = last_mux_cell->getParam("\\WIDTH").as_int(); - for (int i = 0; i < width; ++i) { - RTLIL::SigSpec a_port; - // Because we went in reverse order above, un-reverse $pmux's B port here - for (int j = pmux_b_port.size()/width-1; j >= 0; --j) - a_port.append(pmux_b_port.extract(j*width+i, 1)); - // Create a $shiftx that shifts by the address line used in the case statement - mod->addShiftx(NEW_ID, a_port, sw->signal, pmux_y_port.extract(i, 1)); - } - // Disconnect $pmux by replacing its output port with a floating wire - last_mux_cell->setPort("\\Y", mod->addWire(NEW_ID, width)); - } + // Mark this pmux as being $shiftx compatible + if (shiftx && last_mux_cell && last_mux_cell->type == "$pmux") + last_mux_cell->set_bool_attribute("\\shiftx_compatible"); } return result; |