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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 2020-07-22 13:34:11 +02:00
parent 8501342fc5
commit cf60699884
7 changed files with 93 additions and 390 deletions
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tests/arch/ice40/fsm.ys
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@ -12,5 +12,5 @@ cd fsm # Constrain all select calls below inside the top module
select -assert-count 4 t:SB_DFF
select -assert-count 2 t:SB_DFFESR
select -assert-count 15 t:SB_LUT4
select -assert-max 15 t:SB_LUT4
select -assert-none t:SB_DFFESR t:SB_DFF t:SB_LUT4 %% t:* %D