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Further improve extract_fa pass

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This commit is contained in:
Clifford Wolf 2017-08-28 19:43:26 +02:00
parent a682800187
commit ebbb0e9479
1 changed files with 42 additions and 1 deletions
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43
passes/techmap/extract_fa.cc
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@ -28,6 +28,9 @@ struct ExtractFaConfig
{
bool enable_fa = false;
bool enable_ha = false;
bool verbose = false;
int maxdepth = 20;
int maxbreadth = 6;
};
// http://svn.clifford.at/handicraft/2016/bindec/bindec.c
@ -63,6 +66,9 @@ struct ExtractFaWorker
dict<tuple<SigBit, SigBit>, dict<int, pool<SigBit>>> func2;
dict<tuple<SigBit, SigBit, SigBit>, dict<int, pool<SigBit>>> func3;
int count_func2;
int count_func3;
struct func2_and_info_t {
bool inv_a, inv_b, inv_y;
};
@ -182,6 +188,7 @@ struct ExtractFaWorker
if (func == xor2_func || func == xnor2_func)
xorxnor2.insert(tuple<SigBit, SigBit>(A, B));
count_func2++;
func2[tuple<SigBit, SigBit>(A, B)][func].insert(root);
}
@ -221,6 +228,7 @@ struct ExtractFaWorker
if (func == xor3_func || func == xnor3_func)
xorxnor3.insert(tuple<SigBit, SigBit, SigBit>(A, B, C));
count_func3++;
func3[tuple<SigBit, SigBit, SigBit>(A, B, C)][func].insert(root);
}
}
@ -284,7 +292,19 @@ struct ExtractFaWorker
pool<SigBit> leaves = { root };
pool<pool<SigBit>> cache;
find_partitions(root, leaves, cache, 20, 10);
if (config.verbose)
log(" checking %s\n", log_signal(it.first));
count_func2 = 0;
count_func3 = 0;
find_partitions(root, leaves, cache, config.maxdepth, config.maxbreadth);
if (config.verbose && count_func2 > 0)
log(" extracted %d two-input functions\n", count_func2);
if (config.verbose && count_func3 > 0)
log(" extracted %d three-input functions\n", count_func3);
}
for (auto &key : xorxnor3)
@ -460,6 +480,15 @@ struct ExtractFaPass : public Pass {
log(" Enable cell types (fa=full adder, ha=half adder)\n");
log(" All types are enabled if none of this options is used\n");
log("\n");
log(" -d <int>\n");
log(" Set maximum depth for extracted logic cones (default=20)\n");
log("\n");
log(" -b <int>\n");
log(" Set maximum breadth for extracted logic cones (default=6)\n");
log("\n");
log(" -v\n");
log(" Verbose output\n");
log("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
@ -479,6 +508,18 @@ struct ExtractFaPass : public Pass {
config.enable_ha = true;
continue;
}
if (args[argidx] == "-v") {
config.verbose = true;
continue;
}
if (args[argidx] == "-d" && argidx+2 < args.size()) {
config.maxdepth = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-b" && argidx+2 < args.size()) {
config.maxbreadth = atoi(args[++argidx].c_str());
continue;
}
break;
}
extra_args(args, argidx, design);