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Added "opt -fast"

This commit is contained in:
Clifford Wolf 2014-08-16 15:34:15 +02:00
parent dbdf89c705
commit eb17fbade5
1 changed files with 45 additions and 19 deletions
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44
passes/opt/opt.cc
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@ -37,7 +37,7 @@ struct OptPass : public Pass {
log("a series of trivial optimizations and cleanups. This pass executes the other\n");
log("passes in the following order:\n");
log("\n");
log(" opt_const\n");
log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" opt_share -nomux\n");
log("\n");
log(" do\n");
@ -49,15 +49,26 @@ struct OptPass : public Pass {
log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" while <changed design>\n");
log("\n");
log("When called with -fast the following script is used instead:\n");
log("\n");
log(" do\n");
log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" opt_share\n");
log(" opt_rmdff\n");
log(" opt_clean [-purge]\n");
log(" while <changed design in opt_rmdff>\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("\n");
}
virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{
std::string opt_clean_args;
std::string opt_const_args;
std::string opt_reduce_args;
bool fast_mode = false;
log_header("Executing OPT pass (performing simple optimizations).\n");
log_push();
@ -89,14 +100,31 @@ struct OptPass : public Pass {
opt_const_args += " -keepdc";
continue;
}
if (args[argidx] == "-fast") {
fast_mode = true;
continue;
}
break;
}
extra_args(args, argidx, design);
log_header("Optimizing in-memory representation of design.\n");
design->optimize();
Pass::call(design, "opt_const");
if (fast_mode)
{
while (1) {
Pass::call(design, "opt_const" + opt_const_args);
Pass::call(design, "opt_share");
OPT_DID_SOMETHING = false;
Pass::call(design, "opt_rmdff");
if (OPT_DID_SOMETHING == false)
break;
Pass::call(design, "opt_clean" + opt_clean_args);
log_header("Rerunning OPT passes. (Removed registers in this run.)\n");
}
Pass::call(design, "opt_clean" + opt_clean_args);
}
else
{
Pass::call(design, "opt_const" + opt_const_args);
Pass::call(design, "opt_share -nomux");
while (1) {
OPT_DID_SOMETHING = false;
@ -110,11 +138,9 @@ struct OptPass : public Pass {
break;
log_header("Rerunning OPT passes. (Maybe there is more to do..)\n");
}
}
log_header("Optimizing in-memory representation of design.\n");
design->optimize();
log_header("Finished OPT passes. (There is nothing left to do.)\n");
log_header(fast_mode ? "Finished fast OPT passes." : "Finished OPT passes. (There is nothing left to do.)\n");
log_pop();
}
} OptPass;