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Added $lut support to blif backend (by user eddiehung from reddit)

This commit is contained in:
Clifford Wolf 2014-02-22 14:25:32 +01:00
parent 357f3f6e93
commit 337b461d26
1 changed files with 23 additions and 0 deletions
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23
backends/blif/blif.cc
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@ -190,6 +190,29 @@ struct BlifDumper
continue;
}
if (!config->icells_mode && cell->type == "$lut") {
fprintf(f, ".names");
auto &inputs = cell->connections.at("\\I");
auto width = cell->parameters.at("\\WIDTH").as_int();
log_assert(inputs.width == width);
for (int i = 0; i < inputs.width; i++) {
fprintf(f, " %s", cstr(inputs.extract(i, 1)));
}
auto &output = cell->connections.at("\\O");
log_assert(output.width == 1);
fprintf(f, " %s", cstr(output));
fprintf(f, "\n");
auto mask = cell->parameters.at("\\LUT").as_string();
for (int i = 0; i < (1 << width); i++) {
if (mask[i] == '0') continue;
for (int j = width-1; j >= 0; j--) {
fputc((i>>j)&1 ? '1' : '0', f);
}
fprintf(f, " %c\n", mask[i]);
}
continue;
}
fprintf(f, ".%s %s", subckt_or_gate(cell->type), cstr(cell->type));
for (auto &conn : cell->connections)
for (int i = 0; i < conn.second.width; i++) {