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aiger2: Add strashing option

This commit is contained in:
Martin Povišer 2024-09-11 11:02:40 +02:00
parent fa39227416
commit 5671c10173
1 changed files with 32 additions and 9 deletions
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41
backends/aiger2/aiger.cc
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@ -99,9 +99,15 @@ struct Index {
ModuleInfo *top_minfo;
std::vector<Lit> lits;
Index(RTLIL::Module *top)
: design(top->design), top(top)
Index()
{
}
void setup(RTLIL::Module *top)
{
design = top->design;
this->top = top;
modules.reserve(top->design->modules().size());
int nlits = index_module(top);
log_debug("allocating for %d literals\n", nlits);
@ -109,7 +115,9 @@ struct Index {
top_minfo = &modules.at(top);
}
bool const_folding = false;
bool const_folding = true;
bool strashing = false;
dict<std::pair<int, int>, int> cache;
Lit AND(Lit a, Lit b)
{
@ -122,7 +130,20 @@ struct Index {
return a;
}
return (static_cast<Writer*>(this))->emit_gate(a, b);
if (!strashing) {
return (static_cast<Writer*>(this))->emit_gate(a, b);
} else {
if (a < b) std::swap(a, b);
auto pair = std::make_pair(a, b);
if (!cache.count(pair)) {
Lit nl = (static_cast<Writer*>(this))->emit_gate(a, b);
cache[pair] = nl;
return nl;
} else {
return cache.at(pair);
}
}
}
Lit NOT(Lit lit)
@ -552,9 +573,6 @@ struct AigerWriter : Index<AigerWriter, unsigned int> {
i++;
}
}
AigerWriter(RTLIL::Module *top)
: Index(top) {}
};
struct Aiger2Backend : Backend {
@ -568,8 +586,13 @@ struct Aiger2Backend : Backend {
log_header(design, "Executing AIGER2 backend.\n");
size_t argidx;
AigerWriter writer;
writer.const_folding = true;
for (argidx = 1; argidx < args.size(); argidx++) {
break;
if (args[argidx] == "-strash")
writer.strashing = true;
else
break;
}
extra_args(f, filename, args, argidx);
@ -579,7 +602,7 @@ struct Aiger2Backend : Backend {
log_cmd_error("No top module selected\n");
design->bufNormalize(true);
AigerWriter writer(top);
writer.setup(top);
writer.write(f);
// we are leaving the sacred land, un-bufnormalize