diff options
Diffstat (limited to 'passes/sat')
| -rw-r--r-- | passes/sat/sat.cc | 38 |
1 files changed, 34 insertions, 4 deletions
diff --git a/passes/sat/sat.cc b/passes/sat/sat.cc index cfa97a345..2530ed418 100644 --- a/passes/sat/sat.cc +++ b/passes/sat/sat.cc @@ -50,7 +50,7 @@ struct SatHelper bool prove_asserts; // undef constraints - bool enable_undef, set_init_undef, set_init_zero, ignore_unknown_cells; + bool enable_undef, set_init_def, set_init_undef, set_init_zero, ignore_unknown_cells; std::vector<std::string> sets_def, sets_any_undef, sets_all_undef; std::map<int, std::vector<std::string>> sets_def_at, sets_any_undef_at, sets_all_undef_at; @@ -66,6 +66,7 @@ struct SatHelper { this->enable_undef = enable_undef; satgen.model_undef = enable_undef; + set_init_def = false; set_init_undef = false; set_init_zero = false; ignore_unknown_cells = false; @@ -133,6 +134,12 @@ struct SatHelper log_cmd_error("Found -set-init bits that are not part of the initial_state: %s\n", log_signal(rem)); } + if (set_init_def) { + RTLIL::SigSpec rem = satgen.initial_state.export_all(); + std::vector<int> undef_rem = satgen.importUndefSigSpec(rem, 1); + ez.assume(ez.NOT(ez.expression(ezSAT::OpOr, undef_rem))); + } + if (set_init_undef) { RTLIL::SigSpec rem = satgen.initial_state.export_all(); rem.remove(big_lhs); @@ -757,6 +764,9 @@ struct SatPass : public Pass { log(" -set-init-undef\n"); log(" set all initial states (not set using -set-init) to undef\n"); log("\n"); + log(" -set-init-def\n"); + log(" do not force a value for the initial state but do not allow undef\n"); + log("\n"); log(" -set-init-zero\n"); log(" set all initial states (not set using -set-init) to zero\n"); log("\n"); @@ -768,6 +778,10 @@ struct SatPass : public Pass { log(" proven that the condition holds forever after the number of time steps\n"); log(" specified using -seq.\n"); log("\n"); + log(" -tempinduct-def\n"); + log(" Perform a temporal induction proof. Assume an initial state with all\n"); + log(" registers set to defined values for the induction step.\n"); + log("\n"); log(" -prove <signal> <value>\n"); log(" Attempt to proof that <signal> is always <value>.\n"); log("\n"); @@ -807,7 +821,7 @@ struct SatPass : public Pass { bool verify = false, fail_on_timeout = false, enable_undef = false, set_def_inputs = false; bool ignore_div_by_zero = false, set_init_undef = false, set_init_zero = false, max_undef = false; bool tempinduct = false, prove_asserts = false, show_inputs = false, show_outputs = false; - bool ignore_unknown_cells = false, falsify = false; + bool ignore_unknown_cells = false, falsify = false, tempinduct_def = false, set_init_def = false; log_header("Executing SAT pass (solving SAT problems in the circuit).\n"); @@ -890,6 +904,11 @@ struct SatPass : public Pass { tempinduct = true; continue; } + if (args[argidx] == "-tempinduct-def") { + tempinduct = true; + tempinduct_def = true; + continue; + } if (args[argidx] == "-prove" && argidx+2 < args.size()) { std::string lhs = args[++argidx]; std::string rhs = args[++argidx]; @@ -952,6 +971,10 @@ struct SatPass : public Pass { enable_undef = true; continue; } + if (args[argidx] == "-set-init-def") { + set_init_def = true; + continue; + } if (args[argidx] == "-set-init-zero") { set_init_zero = true; continue; @@ -990,8 +1013,8 @@ struct SatPass : public Pass { if (!prove.size() && !prove_x.size() && !prove_asserts && tempinduct) log_cmd_error("Got -tempinduct but nothing to prove!\n"); - if (set_init_undef && set_init_zero) - log_cmd_error("Got -set-init-undef and -set-init-zero!\n"); + if (set_init_undef + set_init_zero + set_init_def > 1) + log_cmd_error("The options -set-init-undef, -set-init-def, and -set-init-zero are exclusive!\n"); if (set_def_inputs) { for (auto &it : module->wires) @@ -1034,6 +1057,7 @@ struct SatPass : public Pass { basecase.sets_any_undef_at = sets_any_undef_at; basecase.sets_all_undef_at = sets_all_undef_at; basecase.sets_init = sets_init; + basecase.set_init_def = set_init_def; basecase.set_init_undef = set_init_undef; basecase.set_init_zero = set_init_zero; basecase.satgen.ignore_div_by_zero = ignore_div_by_zero; @@ -1058,6 +1082,11 @@ struct SatPass : public Pass { inductstep.setup(1); inductstep.ez.assume(inductstep.setup_proof(1)); + if (tempinduct_def) { + std::vector<int> undef_state = inductstep.satgen.importUndefSigSpec(inductstep.satgen.initial_state.export_all(), 1); + inductstep.ez.assume(inductstep.ez.NOT(inductstep.ez.expression(ezSAT::OpOr, undef_state))); + } + for (int inductlen = 1; inductlen <= maxsteps || maxsteps == 0; inductlen++) { log("\n** Trying induction with length %d **\n", inductlen); @@ -1151,6 +1180,7 @@ struct SatPass : public Pass { sathelper.sets_any_undef_at = sets_any_undef_at; sathelper.sets_all_undef_at = sets_all_undef_at; sathelper.sets_init = sets_init; + sathelper.set_init_def = set_init_def; sathelper.set_init_undef = set_init_undef; sathelper.set_init_zero = set_init_zero; sathelper.satgen.ignore_div_by_zero = ignore_div_by_zero; |