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Error out on latches.

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This commit is contained in:
nella 2026-06-17 17:36:32 +02:00
parent 1023361d6c
commit b2d688dbf9
14 changed files with 149 additions and 37 deletions
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23
techlibs/nanoxplore/synth_nanoxplore.cc
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@ -97,13 +97,19 @@ struct SynthNanoXplorePass : public ScriptPass
log(" read/write collision\" (same result as setting the no_rw_check\n");
log(" attribute on all memories).\n");
log("\n");
log(" -latches <auto|warn|error>\n");
log(" select the behaviour for latches that cannot be mapped to a\n");
log(" dedicated hardware primitive and are implemented using LUTs\n");
log(" instead. 'error' (the default) aborts synthesis, 'warn' only\n");
log(" prints a warning, and 'auto' permits them without complaint.\n");
log("\n");
log("\n");
log("The following commands are executed by this synthesis command:\n");
help_script();
log("\n");
}
string top_opt, json_file, family;
string top_opt, json_file, family, latches;
bool flatten, abc9, nocy, nodffe, norfram, nobram, noiopad, no_rw_check;
std::string postfix;
int min_ce_use, min_srst_use;
@ -124,6 +130,7 @@ struct SynthNanoXplorePass : public ScriptPass
postfix = "";
min_ce_use = 8;
min_srst_use = 8;
latches = "error";
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@ -202,10 +209,17 @@ struct SynthNanoXplorePass : public ScriptPass
no_rw_check = true;
continue;
}
if (args[argidx] == "-latches" && argidx+1 < args.size()) {
latches = args[++argidx];
continue;
}
break;
}
extra_args(args, argidx, design);
if (latches != "auto" && latches != "warn" && latches != "error")
log_cmd_error("Invalid value '%s' for -latches (expected auto, warn or error)\n", latches.c_str());
if (family.empty()) {
//log_warning("NanoXplore family not set, setting it to NG-ULTRA.\n");
family = "ultra";
@ -249,7 +263,7 @@ struct SynthNanoXplorePass : public ScriptPass
if (check_label("coarse"))
{
run("proc");
run("proc -latches " + (latches == "error" ? std::string("auto") : latches));
if (flatten || help_mode) {
run("check");
run("flatten", "(skip if -noflatten)");
@ -325,7 +339,10 @@ struct SynthNanoXplorePass : public ScriptPass
dfflegalize_args += stringf(" -cell $_DLATCH_?_ x -mince %d -minsrst %d", min_ce_use, min_srst_use);
run("dfflegalize" + dfflegalize_args,"($_*DFFE_* only if not -nodffe)");
run("opt_merge");
run("check -nolatches");
if (help_mode)
run("select -assert-none t:$_DLATCH_* t:$_DLATCHSR_*", "(only if -latches error, the default)");
else if (latches == "error")
run("select -assert-none t:$_DLATCH_* t:$_DLATCHSR_*");
run("techmap -map +/nanoxplore/latches_map.v");
run("techmap -map +/nanoxplore/cells_map.v");
run("opt_expr -undriven -mux_undef");