riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

64
passes/opt/opt.cc
View File

@ -37,7 +37,7 @@ struct OptPass : public Pass {
log("a series of trivial optimizations and cleanups. This pass executes the other\n"); log("a series of trivial optimizations and cleanups. This pass executes the other\n");
log("passes in the following order:\n"); log("passes in the following order:\n");
log("\n"); log("\n");
log(" opt_const\n"); log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" opt_share -nomux\n"); log(" opt_share -nomux\n");
log("\n"); log("\n");
log(" do\n"); log(" do\n");
@ -49,15 +49,26 @@ struct OptPass : public Pass {
log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n"); log(" opt_const [-mux_undef] [-mux_bool] [-undriven] [-fine] [-keepdc]\n");
log(" while <changed design>\n"); log(" while <changed design>\n");
log("\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("Note: Options in square brackets (such as [-keepdc]) are passed through to\n");
log("the opt_* commands when given to 'opt'.\n"); log("the opt_* commands when given to 'opt'.\n");
log("\n"); log("\n");
log("\n");
} }
virtual void execute(std::vector<std::string> args, RTLIL::Design *design) virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
{ {
std::string opt_clean_args; std::string opt_clean_args;
std::string opt_const_args; std::string opt_const_args;
std::string opt_reduce_args; std::string opt_reduce_args;
bool fast_mode = false;
log_header("Executing OPT pass (performing simple optimizations).\n"); log_header("Executing OPT pass (performing simple optimizations).\n");
log_push(); log_push();
@ -89,32 +100,47 @@ struct OptPass : public Pass {
opt_const_args += " -keepdc"; opt_const_args += " -keepdc";
continue; continue;
} }
if (args[argidx] == "-fast") {
fast_mode = true;
continue;
}
break; break;
} }
extra_args(args, argidx, design); extra_args(args, argidx, design);
log_header("Optimizing in-memory representation of design.\n"); if (fast_mode)
design->optimize(); {
while (1) {
Pass::call(design, "opt_const"); Pass::call(design, "opt_const" + opt_const_args);
Pass::call(design, "opt_share -nomux"); Pass::call(design, "opt_share");
while (1) { OPT_DID_SOMETHING = false;
OPT_DID_SOMETHING = false; Pass::call(design, "opt_rmdff");
Pass::call(design, "opt_muxtree"); if (OPT_DID_SOMETHING == false)
Pass::call(design, "opt_reduce" + opt_reduce_args); break;
Pass::call(design, "opt_share"); Pass::call(design, "opt_clean" + opt_clean_args);
Pass::call(design, "opt_rmdff"); log_header("Rerunning OPT passes. (Removed registers in this run.)\n");
}
Pass::call(design, "opt_clean" + opt_clean_args); Pass::call(design, "opt_clean" + opt_clean_args);
}
else
{
Pass::call(design, "opt_const" + opt_const_args); Pass::call(design, "opt_const" + opt_const_args);
if (OPT_DID_SOMETHING == false) Pass::call(design, "opt_share -nomux");
break; while (1) {
log_header("Rerunning OPT passes. (Maybe there is more to do..)\n"); OPT_DID_SOMETHING = false;
Pass::call(design, "opt_muxtree");
Pass::call(design, "opt_reduce" + opt_reduce_args);
Pass::call(design, "opt_share");
Pass::call(design, "opt_rmdff");
Pass::call(design, "opt_clean" + opt_clean_args);
Pass::call(design, "opt_const" + opt_const_args);
if (OPT_DID_SOMETHING == false)
break;
log_header("Rerunning OPT passes. (Maybe there is more to do..)\n");
}
} }
log_header("Optimizing in-memory representation of design.\n"); log_header(fast_mode ? "Finished fast OPT passes." : "Finished OPT passes. (There is nothing left to do.)\n");
design->optimize();
log_header("Finished OPT passes. (There is nothing left to do.)\n");
log_pop(); log_pop();
} }
} OptPass; } OptPass;