riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Added -all and -max options to sat_solve

This commit is contained in:
Clifford Wolf 2013-06-08 12:17:30 +02:00
parent 25ae2d4df0
commit 99957a825f
1 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
passes/sat/sat_solve.cc
View File

@ -116,6 +116,13 @@ struct SatSolvePass : public Pass {
log("This command solves a SAT problem defined over the currently selected circuit\n");
log("and additional constraints passed as parameters.\n");
log("\n");
log(" -all\n");
log(" show all solutions to the problem (this can grow exponentially, use\n");
log(" -max <N> instead to get <N> solutions)\n");
log("\n");
log(" -max <N>\n");
log(" like -all, but limit number of solutions to <N>\n");
log("\n");
log(" -set <signal> <value>\n");
log(" set the specified signal to the specified value.\n");
log("\n");
@ -128,11 +135,20 @@ struct SatSolvePass : public Pass {
{
std::vector<std::pair<std::string, std::string>> sets;
std::vector<std::string> shows;
int loopcount = 0;
log_header("Executing SAT_SOLVE pass (solving SAT problems in the circuit).\n");
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++) {
if (args[argidx] == "-all") {
loopcount = -1;
continue;
}
if (args[argidx] == "-max" && argidx+1 < args.size()) {
loopcount = atoi(args[++argidx].c_str());
continue;
}
if (args[argidx] == "-set" && argidx+2 < args.size()) {
std::string lhs = args[++argidx].c_str();
std::string rhs = args[++argidx].c_str();
@ -247,23 +263,28 @@ struct SatSolvePass : public Pass {
modelExpressions.push_back(vec[0]);
}
rerun_solver:
log("Solving problem with %d variables and %d clauses..\n", ez.numCnfVariables(), ez.numCnfClauses());
if (ez.solve(modelExpressions, modelValues))
{
log("SAT solving finished - model found:\n\n");
int modelIdx = 0;
int maxModelName = 10;
int maxModelWidth = 10;
modelSig.optimize();
for (auto &c : modelSig.chunks)
if (c.wire != NULL) {
maxModelName = std::max(maxModelName, int(c.wire->name.size()));
maxModelWidth = std::max(maxModelWidth, c.width);
}
const char *hline = "--------------------------------------------------------";
log(" %-*s %10s %10s %*s\n", maxModelName+10, "Signal Name", "Dec", "Hex", maxModelWidth+5, "Bin");
log(" %*.*s %10.10s %10.10s %*.*s\n", maxModelName+10, maxModelName+10,
hline, hline, hline, maxModelWidth+5, maxModelWidth+5, hline);
for (auto &c : modelSig.chunks) {
if (c.wire == NULL)
continue;
@ -276,6 +297,16 @@ struct SatSolvePass : public Pass {
log(" %-*s %10s %10s %*s\n", maxModelName+10, log_signal(c), "--", "--", maxModelWidth+5, value.as_string().c_str());
modelIdx += c.width;
}
if (loopcount != 0) {
log("\n");
std::vector<int> clause;
for (size_t i = 0; i < modelExpressions.size(); i++)
clause.push_back(modelValues.at(i) ? ez.NOT(modelExpressions.at(i)) : modelExpressions.at(i));
ez.assume(ez.expression(ezSAT::OpOr, clause));
loopcount--;
goto rerun_solver;
}
}
else
log("SAT solving finished - no model found.\n");