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cxxrtl: get rid of -O5 aka `opt_clean -purge` optimization level. 

This isn't actually necessary anymore after scheduling was improved,
and `clean -purge` disrupts the mapping between wires in the input
RTLIL netlist and the output CXXRTL code.
This commit is contained in:
whitequark 2020-05-22 17:44:05 +00:00
parent 026fed3135
commit 281c96856a
1 changed files with 2 additions and 8 deletions
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10
backends/cxxrtl/cxxrtl.cc
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@ -2306,10 +2306,7 @@ struct CxxrtlBackend : public Backend {
log(" like -O3, and localize public wires not marked (*keep*) if possible.\n");
log("\n");
log(" -O5\n");
log(" like -O4, and run `opt_clean -purge` first.\n");
log("\n");
log(" -O6\n");
log(" like -O5, and run `proc; flatten` first.\n");
log(" like -O4, and run `proc; flatten` first.\n");
log("\n");
}
void execute(std::ostream *&f, std::string filename, std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@ -2343,13 +2340,10 @@ struct CxxrtlBackend : public Backend {
extra_args(f, filename, args, argidx);
switch (opt_level) {
case 6:
case 5:
worker.max_opt_level = true;
worker.run_proc_flatten = true;
YS_FALLTHROUGH
case 5:
worker.run_opt_clean_purge = true;
YS_FALLTHROUGH
case 4:
worker.localize_public = true;
YS_FALLTHROUGH