diff options
Diffstat (limited to 'passes')
| -rw-r--r-- | passes/opt/opt.cc | 8 | ||||
| -rw-r--r-- | passes/opt/opt_rmdff.cc | 4 |
2 files changed, 10 insertions, 2 deletions
diff --git a/passes/opt/opt.cc b/passes/opt/opt.cc index a4aca2fee..e9a43e0f3 100644 --- a/passes/opt/opt.cc +++ b/passes/opt/opt.cc @@ -44,7 +44,7 @@ struct OptPass : public Pass { log(" opt_muxtree\n"); log(" opt_reduce [-fine] [-full]\n"); log(" opt_merge [-share_all]\n"); - log(" opt_rmdff [-keepdc]\n"); + log(" opt_rmdff [-keepdc] [-sat]\n"); log(" opt_clean [-purge]\n"); log(" opt_expr [-mux_undef] [-mux_bool] [-undriven] [-clkinv] [-fine] [-full] [-keepdc]\n"); log(" while <changed design>\n"); @@ -54,7 +54,7 @@ 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]\n"); + log(" opt_rmdff [-keepdc] [-sat]\n"); log(" opt_clean [-purge]\n"); log(" while <changed design in opt_rmdff>\n"); log("\n"); @@ -112,6 +112,10 @@ struct OptPass : public Pass { opt_rmdff_args += " -keepdc"; continue; } + if (args[argidx] == "-sat") { + opt_rmdff_args += " -sat"; + continue; + } if (args[argidx] == "-share_all") { opt_merge_args += " -share_all"; continue; diff --git a/passes/opt/opt_rmdff.cc b/passes/opt/opt_rmdff.cc index 17e0d7cd4..be6ac2d30 100644 --- a/passes/opt/opt_rmdff.cc +++ b/passes/opt/opt_rmdff.cc @@ -549,6 +549,10 @@ struct OptRmdffPass : public Pass { log("This pass identifies flip-flops with constant inputs and replaces them with\n"); log("a constant driver.\n"); log("\n"); + log(" -sat\n"); + log(" additionally invoke SAT solver to detect and remove flip-flops (with \n"); + log(" non-constant inputs) that can also be replaced with a constant driver\n"); + log("\n"); } void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE { |