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synth_ice40: Use opt_dff.

Browse source 
The main part is converting ice40_dsp to recognize the new FF types
created in opt_dff instead of trying to recognize the mux patterns on
its own.

The fsm call has been moved upwards because the passes cannot deal with
$dffe/$sdff*, and other optimizations don't help it much anyway.
This commit is contained in:
Marcelina Kościelnicka 2020-07-22 13:34:11 +02:00
parent 8501342fc5
commit cf60699884
7 changed files with 93 additions and 390 deletions
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4
techlibs/ice40/ice40_opt.cc
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@ -215,7 +215,7 @@ struct Ice40OptPass : public Pass {
log(" <ice40 specific optimizations>\n");
log(" opt_expr -mux_undef -undriven [-full]\n");
log(" opt_merge\n");
log(" opt_rmdff\n");
log(" opt_dff\n");
log(" opt_clean\n");
log(" while <changed design>\n");
log("\n");
@ -247,7 +247,7 @@ struct Ice40OptPass : public Pass {
Pass::call(design, "opt_expr " + opt_expr_args);
Pass::call(design, "opt_merge");
Pass::call(design, "opt_rmdff");
Pass::call(design, "opt_dff");
Pass::call(design, "opt_clean");
if (design->scratchpad_get_bool("opt.did_something") == false)