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Improvements in ice40_opt

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This commit is contained in:
Clifford Wolf 2015-12-22 12:18:38 +01:00
parent 8bf452c364
commit 3102ffbb83
1 changed files with 16 additions and 5 deletions
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19
techlibs/ice40/ice40_opt.cc
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@ -76,13 +76,24 @@ static void run_ice40_opts(Module *module)
for (auto cell : sb_lut_cells) for (auto cell : sb_lut_cells)
{ {
if (optimized_co.count(sigmap(cell->getPort("\\I0")))) goto remap_lut; SigSpec inbits;
if (optimized_co.count(sigmap(cell->getPort("\\I1")))) goto remap_lut;
if (optimized_co.count(sigmap(cell->getPort("\\I2")))) goto remap_lut; inbits.append(cell->getPort("\\I0"));
if (optimized_co.count(sigmap(cell->getPort("\\I3")))) goto remap_lut; inbits.append(cell->getPort("\\I1"));
inbits.append(cell->getPort("\\I2"));
inbits.append(cell->getPort("\\I3"));
sigmap.apply(inbits);
if (optimized_co.count(inbits[0])) goto remap_lut;
if (optimized_co.count(inbits[1])) goto remap_lut;
if (optimized_co.count(inbits[2])) goto remap_lut;
if (optimized_co.count(inbits[3])) goto remap_lut;
if (!sigmap(inbits).is_fully_const())
continue; continue;
remap_lut: remap_lut:
module->design->scratchpad_set_bool("opt.did_something", true);
log("Mapping SB_LUT4 cell %s.%s back to logic.\n", log_id(module), log_id(cell)); log("Mapping SB_LUT4 cell %s.%s back to logic.\n", log_id(module), log_id(cell));
cell->type ="$lut"; cell->type ="$lut";