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authorClifford Wolf <clifford@clifford.at>2014-08-08 13:11:54 +0200
committerClifford Wolf <clifford@clifford.at>2014-08-08 13:11:54 +0200
commit622ebab6710815324fa7250554b56f673862b479 (patch)
treeec4fb01e2ce8823bdc24edfbd2a4e0957502a0aa /passes
parent0b8b8d41eb07fd048cbe68acfe4b724e314bbb41 (diff)
Added "sat -prove-skip"
Diffstat (limited to 'passes')
-rw-r--r--passes/sat/sat.cc18
1 files changed, 16 insertions, 2 deletions
diff --git a/passes/sat/sat.cc b/passes/sat/sat.cc
index fd3d405a..c6da4bb4 100644
--- a/passes/sat/sat.cc
+++ b/passes/sat/sat.cc
@@ -917,6 +917,9 @@ struct SatPass : public Pass {
log(" -prove-asserts\n");
log(" Prove that all asserts in the design hold.\n");
log("\n");
+ log(" -prove-skip <N>\n");
+ log(" Do not enforce the prove-condition for the first <N> time steps.\n");
+ log("\n");
log(" -maxsteps <N>\n");
log(" Set a maximum length for the induction.\n");
log("\n");
@@ -945,7 +948,7 @@ struct SatPass : public Pass {
std::map<int, std::vector<std::pair<std::string, std::string>>> sets_at;
std::map<int, std::vector<std::string>> unsets_at, sets_def_at, sets_any_undef_at, sets_all_undef_at;
std::vector<std::string> shows, sets_def, sets_any_undef, sets_all_undef;
- int loopcount = 0, seq_len = 0, maxsteps = 0, initsteps = 0, timeout = 0;
+ int loopcount = 0, seq_len = 0, maxsteps = 0, initsteps = 0, timeout = 0, prove_skip = 0;
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;
@@ -1059,6 +1062,10 @@ struct SatPass : public Pass {
prove_asserts = true;
continue;
}
+ if (args[argidx] == "-prove-skip" && argidx+1 < args.size()) {
+ prove_skip = atoi(args[++argidx].c_str());
+ continue;
+ }
if (args[argidx] == "-seq" && argidx+1 < args.size()) {
seq_len = atoi(args[++argidx].c_str());
continue;
@@ -1154,6 +1161,12 @@ struct SatPass : public Pass {
if (!prove.size() && !prove_x.size() && !prove_asserts && tempinduct)
log_cmd_error("Got -tempinduct but nothing to prove!\n");
+ if (prove_skip && tempinduct)
+ log_cmd_error("Options -prove-skip and -tempinduct don't work with each other.\n");
+
+ if (prove_skip >= seq_len && prove_skip > 0)
+ log_cmd_error("The value of -prove-skip must be smaller than the one of -seq.\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");
@@ -1359,7 +1372,8 @@ struct SatPass : public Pass {
for (int timestep = 1; timestep <= seq_len; timestep++) {
sathelper.setup(timestep);
if (sathelper.prove.size() || sathelper.prove_x.size() || sathelper.prove_asserts)
- prove_bits.push_back(sathelper.setup_proof(timestep));
+ if (timestep > prove_skip)
+ prove_bits.push_back(sathelper.setup_proof(timestep));
}
if (sathelper.prove.size() || sathelper.prove_x.size() || sathelper.prove_asserts)
sathelper.ez.assume(sathelper.ez.NOT(sathelper.ez.expression(ezSAT::OpAnd, prove_bits)));