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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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24
techlibs/lattice/synth_lattice.cc
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@ -156,13 +156,20 @@ struct SynthLatticePass : public ScriptPass
log(" implement constant comparisons in soft logic, do not involve\n");
log(" hard carry chains\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(" (ignored with -asyncprld, which has a latch primitive)\n");
log("\n");
log("\n");
log("The following commands are executed by this synthesis command:\n");
help_script();
log("\n");
}
string top_opt, edif_file, json_file, family;
string top_opt, edif_file, json_file, family, latches;
bool noccu2, nodffe, nobram, nolutram, nowidelut, asyncprld, flatten, dff, retime, abc2, abc9, iopad, nodsp, no_rw_check, have_dsp;
bool cmp2softlogic;
string postfix, arith_map, brams_map, dsp_map, cells_map, map_ram_default, widelut_abc;
@ -189,6 +196,7 @@ struct SynthLatticePass : public ScriptPass
iopad = false;
nodsp = false;
no_rw_check = false;
latches = "error";
postfix = "";
arith_map = "";
brams_map = "";
@ -318,6 +326,10 @@ struct SynthLatticePass : public ScriptPass
cmp2softlogic = true;
continue;
}
if (args[argidx] == "-latches" && argidx+1 < args.size()) {
latches = args[++argidx];
continue;
}
break;
}
extra_args(args, argidx, design);
@ -325,6 +337,9 @@ struct SynthLatticePass : public ScriptPass
if (family.empty())
log_cmd_error("Lattice family parameter must be set.\n");
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 == "ecp5") {
postfix = "_ecp5";
arith_map = "_ccu2c";
@ -401,7 +416,7 @@ struct SynthLatticePass : public ScriptPass
if (check_label("coarse"))
{
run("proc");
run("proc -latches " + ((asyncprld || latches == "error") ? std::string("auto") : latches));
if (flatten || help_mode) {
run("check");
run("flatten");
@ -532,7 +547,10 @@ struct SynthLatticePass : public ScriptPass
if (abc2 || help_mode)
run("abc", " (only if -abc2)");
if (!asyncprld || help_mode) {
run("check -nolatches", "(skip if -asyncprld)");
if (help_mode)
run("select -assert-none t:$_DLATCH_* t:$_DLATCHSR_*", "(skip if -asyncprld; only if -latches error, the default)");
else if (latches == "error")
run("select -assert-none t:$_DLATCH_* t:$_DLATCHSR_*");
run("techmap -map +/lattice/latches_map.v", "(skip if -asyncprld)");
}