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* Revert "Merge pull request #1280 from ↵Eddie Hung2019-08-121-0/+90
| | | | | | | YosysHQ/revert-1266-eddie/ice40_full_adder" This reverts commit c851dc13108021834533094a8a3236da6d9e0161, reversing changes made to f54bf1631ff37a83733c162e6ebd188c1d5ea18f.
* Revert "Wrap SB_LUT+SB_CARRY into $__ICE40_CARRY_WRAPPER"David Shah2019-08-101-90/+0
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* Add ice40_wrapcarry pass, rename $__ICE40_FULL_ADDER -> CARRY_WRAPPEREddie Hung2019-08-071-0/+90