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Re: [PATCH] more PR33928: DIY dataflow in fwprop, to enable it at -O1 and speed it up at -O2
> 1) I think that this should have been packaged as a new dataflow problem
> so that it could have been used by others.
I did do half of it by providing df_rd_simulate functions, and thought
it was okay to stop there following the passes which do liveness
simulation (peep2 for example).
> 2) The function bitmap_only_bit_between should be in bitmap.c