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* Fixed small typo in ice40_unlut help summaryacw12512019-06-191-1/+1
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* Fixed the help summary line for a few commandsacw12512019-06-191-1/+1
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* Extract ice40_unlut pass from ice40_opt.whitequark2018-12-051-0/+106
Currently, `ice40_opt -unlut` would map SB_LUT4 to $lut and convert them back to logic immediately. This is not desirable if the goal is to operate on $lut cells. If this is desirable, the same result as `ice40_opt -unlut` can be achieved by running simplemap and opt after ice40_unlut.