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opt -max_iter

This commit is contained in:
Akash Levy 2026-05-26 06:23:40 -07:00
parent 6748b135aa
commit 9a225025d4
2 changed files with 28 additions and 4 deletions
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2
docs/source/code_examples/macro_commands/opt.ys
View File

@ -13,4 +13,4 @@ do
opt_boundary (-boundary only)
opt_clean
opt_expr
while <changed design>
while <changed design and under -max_iter>

30
passes/opt/opt.cc
View File

@ -50,7 +50,7 @@ struct OptPass : public Pass {
log(" opt_boundary (-boundary only)\n");
log(" opt_clean [-purge]\n");
log(" opt_expr [-mux_undef] [-mux_bool] [-undriven] [-noclkinv] [-fine] [-full] [-keepdc]\n");
log(" while <changed design>\n");
log(" while <changed design> (up to -max_iter iterations)\n");
log("\n");
log("When called with -fast the following script is used instead:\n");
log("\n");
@ -61,11 +61,15 @@ struct OptPass : public Pass {
log(" opt_hier (-hier only)\n");
log(" opt_boundary (-boundary only)\n");
log(" opt_clean [-purge]\n");
log(" while <changed design in opt_dff>\n");
log(" while <changed design in opt_dff> (up to -max_iter iterations)\n");
log("\n");
log("Note: Options in square brackets (such as [-keepdc]) are passed through to\n");
log("the opt_* commands when given to 'opt'.\n");
log("\n");
log(" -max_iter <number>\n");
log(" only run the specified number of iterations.\n");
log(" default: 20. use 0 for unlimited.\n");
log("\n");
log("\n");
}
void execute(std::vector<std::string> args, RTLIL::Design *design) override
@ -80,6 +84,8 @@ struct OptPass : public Pass {
bool noff_mode = false;
bool hier_mode = false;
bool boundary_mode = false;
int max_iter = 20;
bool reached_max_iter = false;
log_header(design, "Executing OPT pass (performing simple optimizations).\n");
log_push();
@ -155,13 +161,19 @@ struct OptPass : public Pass {
boundary_mode = true;
continue;
}
if (args[argidx] == "-max_iter" && argidx+1 < args.size()) {
max_iter = atoi(args[++argidx].c_str());
continue;
}
break;
}
extra_args(args, argidx, design);
if (fast_mode)
{
int iter = 0;
while (1) {
iter++;
Pass::call(design, "opt_expr" + opt_expr_args);
Pass::call(design, "opt_merge" + opt_merge_args);
design->scratchpad_unset("opt.did_something");
@ -174,6 +186,10 @@ struct OptPass : public Pass {
if (boundary_mode)
Pass::call(design, "opt_boundary");
Pass::call(design, "opt_clean" + opt_clean_args);
if (max_iter > 0 && iter >= max_iter) {
reached_max_iter = true;
break;
}
log_header(design, "Rerunning OPT passes. (Removed registers in this run.)\n");
}
Pass::call(design, "opt_clean" + opt_clean_args);
@ -182,7 +198,9 @@ struct OptPass : public Pass {
{
Pass::call(design, "opt_expr" + opt_expr_args);
Pass::call(design, "opt_merge -nomux" + opt_merge_args);
int iter = 0;
while (1) {
iter++;
design->scratchpad_unset("opt.did_something");
Pass::call(design, "opt_muxtree");
Pass::call(design, "opt_reduce" + opt_reduce_args);
@ -199,6 +217,10 @@ struct OptPass : public Pass {
Pass::call(design, "opt_expr" + opt_expr_args);
if (design->scratchpad_get_bool("opt.did_something") == false)
break;
if (max_iter > 0 && iter >= max_iter) {
reached_max_iter = true;
break;
}
log_header(design, "Rerunning OPT passes. (Maybe there is more to do..)\n");
}
}
@ -207,7 +229,9 @@ struct OptPass : public Pass {
design->sort();
design->check();
log_header(design, "Finished fast OPT passes.%s\n", fast_mode ? "" : " (There is nothing left to do.)");
const char *done_reason = reached_max_iter ? " (Reached maximum number of iterations.)" :
(fast_mode ? "" : " (There is nothing left to do.)");
log_header(design, "Finished %sOPT passes.%s\n", fast_mode ? "fast " : "", done_reason);
log_pop();
}
} OptPass;