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Restore old CO behaviour

This commit is contained in:
Eddie Hung 2019-07-31 15:45:15 -07:00
parent 84c7a562e5
commit e4a638c292
1 changed files with 7 additions and 6 deletions
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13
passes/pmgen/ice40_dsp.cc
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@ -144,14 +144,15 @@ void create_ice40_dsp(ice40_dsp_pm &pm)
// SB_MAC16 Output Interface
SigSpec O = st.sigO;
if (GetSize(O) == 33) {
cell->setPort("\\CO", st.sigO[32]);
O.remove(32);
int O_width = GetSize(O);
if (O_width == 33) {
log_assert(st.addAB);
cell->setPort("\\CO", O[-1]);
O.remove(O_width-1);
}
else {
log_assert(GetSize(O) <= 32);
else
cell->setPort("\\CO", pm.module->addWire(NEW_ID));
}
log_assert(GetSize(O) <= 32);
if (GetSize(O) < 32)
O.append(pm.module->addWire(NEW_ID, 32-GetSize(O)));