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synth_ice40: Use opt_dff.

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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
2020-07-30 22:26:20 +02:00
parent 8501342fc5
commit cf60699884
7 changed files with 93 additions and 390 deletions
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techlibs/ice40/Makefile.inc
-1
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@@ -1,7 +1,6 @@
OBJS += techlibs/ice40/synth_ice40.o
OBJS += techlibs/ice40/ice40_braminit.o
OBJS += techlibs/ice40/ice40_ffssr.o
OBJS += techlibs/ice40/ice40_opt.o
GENFILES += techlibs/ice40/brams_init1.vh