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Do not optimize away FFs in "prep" and Verific fron-end

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Signed-off-by: Claire Wolf <claire@symbioticeda.com>
This commit is contained in:
Claire Wolf 2020-06-09 15:54:14 +02:00
parent 9a2cf5e3db
commit 3c7122c378
3 changed files with 17 additions and 7 deletions
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3
frontends/verific/verific.cc
View file

@ -2175,6 +2175,9 @@ struct VerificPass : public Pass {
RuntimeFlags::SetVar("vhdl_support_variable_slice", 1);
RuntimeFlags::SetVar("vhdl_ignore_assertion_statements", 0);
RuntimeFlags::SetVar("veri_preserve_assignments", 1);
RuntimeFlags::SetVar("vhdl_preserve_assignments", 1);
// Workaround for VIPER #13851
RuntimeFlags::SetVar("veri_create_name_for_unnamed_gen_block", 1);

17
passes/opt/opt.cc
View file

@ -44,8 +44,8 @@ struct OptPass : public Pass {
log(" opt_muxtree\n");
log(" opt_reduce [-fine] [-full]\n");
log(" opt_merge [-share_all]\n");
log(" opt_share (-full only)\n");
log(" opt_rmdff [-keepdc] [-sat]\n");
log(" opt_share (-full only)\n");
log(" opt_rmdff [-keepdc] [-sat] (except when called with -noff)\n");
log(" opt_clean [-purge]\n");
log(" opt_expr [-mux_undef] [-mux_bool] [-undriven] [-clkinv] [-fine] [-full] [-keepdc]\n");
log(" while <changed design>\n");
@ -55,7 +55,7 @@ struct OptPass : public Pass {
log(" do\n");
log(" opt_expr [-mux_undef] [-mux_bool] [-undriven] [-clkinv] [-fine] [-full] [-keepdc]\n");
log(" opt_merge [-share_all]\n");
log(" opt_rmdff [-keepdc] [-sat]\n");
log(" opt_rmdff [-keepdc] [-sat] (except when called with -noff)\n");
log(" opt_clean [-purge]\n");
log(" while <changed design in opt_rmdff>\n");
log("\n");
@ -73,6 +73,7 @@ struct OptPass : public Pass {
std::string opt_rmdff_args;
bool opt_share = false;
bool fast_mode = false;
bool noff_mode = false;
log_header(design, "Executing OPT pass (performing simple optimizations).\n");
log_push();
@ -127,6 +128,10 @@ struct OptPass : public Pass {
fast_mode = true;
continue;
}
if (args[argidx] == "-noff") {
noff_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
@ -137,7 +142,8 @@ struct OptPass : public Pass {
Pass::call(design, "opt_expr" + opt_expr_args);
Pass::call(design, "opt_merge" + opt_merge_args);
design->scratchpad_unset("opt.did_something");
Pass::call(design, "opt_rmdff" + opt_rmdff_args);
if (!noff_mode)
Pass::call(design, "opt_rmdff" + opt_rmdff_args);
if (design->scratchpad_get_bool("opt.did_something") == false)
break;
Pass::call(design, "opt_clean" + opt_clean_args);
@ -156,7 +162,8 @@ struct OptPass : public Pass {
Pass::call(design, "opt_merge" + opt_merge_args);
if (opt_share)
Pass::call(design, "opt_share");
Pass::call(design, "opt_rmdff" + opt_rmdff_args);
if (!noff_mode)
Pass::call(design, "opt_rmdff" + opt_rmdff_args);
Pass::call(design, "opt_clean" + opt_clean_args);
Pass::call(design, "opt_expr" + opt_expr_args);
if (design->scratchpad_get_bool("opt.did_something") == false)

4
techlibs/common/prep.cc
View file

@ -192,7 +192,7 @@ struct PrepPass : public ScriptPass
run(nokeepdc ? "opt_expr" : "opt_expr -keepdc");
run("opt_clean");
run("check");
run(nokeepdc ? "opt" : "opt -keepdc");
run(nokeepdc ? "opt -noff" : "opt -noff -keepdc");
if (!ifxmode) {
if (help_mode)
run("wreduce -keepdc [-memx]");
@ -208,7 +208,7 @@ struct PrepPass : public ScriptPass
run("opt_clean");
run("memory_collect");
}
run(nokeepdc ? "opt -fast" : "opt -keepdc -fast");
run(nokeepdc ? "opt -noff -fast" : "opt -noff -keepdc -fast");
}
if (check_label("check"))