Add comment about supporting $dffe in ice40_dsp

diff --git a/passes/pmgen/ice40_dsp.pmg b/passes/pmgen/ice40_dsp.pmg
index 040332539a81edddaef55735b2217666f82a0123..b6da1d2f6ec5e595afb1f1842a967e382f0e7b6c 100644 (file)
--- a/passes/pmgen/ice40_dsp.pmg
+++ b/passes/pmgen/ice40_dsp.pmg
@@ -12,6 +12,7 @@ match mul
 endmatch
 
 match ffA
+                           // TODO: Support $dffe too by checking if all enable signals are identical
        select ffA->type.in($dff)
        filter !port(mul, \A).remove_const().empty()
        filter includes(port(ffA, \Q).to_sigbit_set(), port(mul, \A).remove_const().to_sigbit_set())