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ice40: reduce ABC9 internal fanout warnings with a param for CI->I3

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This commit is contained in:
Eddie Hung 2020-01-24 11:59:48 -08:00
parent da6abc0149
commit b178761551
6 changed files with 26 additions and 32 deletions
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4
techlibs/ice40/ice40_opt.cc
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@ -139,7 +139,8 @@ static void run_ice40_opts(Module *module)
log("Optimized $__ICE40_CARRY_WRAPPER cell back to logic (without SB_CARRY) %s.%s: CO=%s\n",
log_id(module), log_id(cell), log_signal(replacement_output));
cell->type = "$lut";
cell->setPort("\\A", { cell->getPort("\\I0"), inbit[0], inbit[1], cell->getPort("\\I3") });
auto I3 = cell->getPort(cell->getParam(ID(I3_IS_CI)).as_bool() ? ID(CI) : ID(I3));
cell->setPort("\\A", { cell->getPort("\\I0"), inbit[0], inbit[1], I3 });
cell->setPort("\\Y", cell->getPort("\\O"));
cell->unsetPort("\\B");
cell->unsetPort("\\CI");
@ -148,6 +149,7 @@ static void run_ice40_opts(Module *module)
cell->unsetPort("\\CO");
cell->unsetPort("\\O");
cell->setParam("\\WIDTH", 4);
cell->unsetParam("\\I3_IS_CI");
}
continue;
}