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* Merge pull request #1926 from YosysHQ/eddie/abc9_auto_dffEddie Hung2020-05-1834-1853/+1656
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| * abc9: use (* abc9_keep *) instead of (* abc9_scc *); apply to $_DFF_?_Eddie Hung2020-05-145-23/+11
| * abc9_ops: -prep_hier to create unmap module that removes Q's (* init *)Eddie Hung2020-05-141-4/+6
| * abc9: preserve $_DFF_?_.Q's (* init *); rely on clean to remove itEddie Hung2020-05-144-25/+13
| * Fix broken test when ignoring abc9_flop with init == 1'b1Eddie Hung2020-05-141-3/+0
| * abc9_ops/xaiger: further reducing Module::derive() calls by ...Eddie Hung2020-05-144-135/+121
| * Cleanup; reduce Module::derive() callsEddie Hung2020-05-144-153/+164
| * ecp5: latches_map.v if *not* -asyncprldEddie Hung2020-05-141-2/+2
| * ecp5: synth_ecp5 to no longer need +/ecp5/abc9_{,un}map.vEddie Hung2020-05-144-43/+3
| * ecp5: fix rebase mistakeEddie Hung2020-05-141-3/+3
| * abc9: update to =_$abc9_flops pattern which includes whiteboxesEddie Hung2020-05-141-3/+3
| * abc9_ops: update docsEddie Hung2020-05-141-11/+10
| * xilinx: gate specify/attributes from iverilogEddie Hung2020-05-141-1/+3
| * abc9: only do +/abc9_map if `DFFEddie Hung2020-05-142-1/+6
| * abc9: rework submod -- since it won't move (* keep *) cellsEddie Hung2020-05-142-34/+29
| * ecp5: TRELLIS_FF bypass path only in async modeEddie Hung2020-05-141-8/+8
| * timinginfo: ignore $specify2 cells if EN is falseEddie Hung2020-05-141-0/+3
| * xilinx/ice40/ecp5: zinit requires selected wires, so select them allEddie Hung2020-05-143-4/+4
| * abc9_ops: move assertEddie Hung2020-05-141-1/+1
| * abc9: put 'aigmap' backEddie Hung2020-05-141-0/+1
| * xilinx/ecp5/ice40: add (* abc9_flop *) to bypass-able cellsEddie Hung2020-05-143-4/+198
| * abc9_ops: fix bypass boxes using (* abc9_bypass *)Eddie Hung2020-05-142-14/+10
| * abc9_ops: tidy up, suppress error if no boxes/holesEddie Hung2020-05-141-18/+18
| * abc9_ops: -prep_delays to not insert delay box if input connection is constEddie Hung2020-05-141-0/+2
| * abc9_ops: cleanup; -prep_dff -> -prep_dff_submodEddie Hung2020-05-142-22/+14
| * abc9_ops: add -prep_bypass for auto bypass boxes; refactorEddie Hung2020-05-1411-941/+667
| * abc9_ops: -reintegrate to handle $_FF_; cleanupEddie Hung2020-05-141-22/+18
| * xaiger: no longer use nonstandard even/odd to designate +ve/-ve polarityEddie Hung2020-05-141-16/+5
| * aiger: -xaiger to return $_FF_ flopsEddie Hung2020-05-141-15/+2
| * abc9: not enough to techmap_fail on (* init=1 *), hide them using $__Eddie Hung2020-05-144-12/+48
| * abc9: test to use box file instead of autoEddie Hung2020-05-143-2/+5
| * abc9: restore selected_modules()Eddie Hung2020-05-141-1/+1
| * synth_*: no need to explicitly read +/abc9_model.vEddie Hung2020-05-144-4/+3
| * Revert "Merge pull request #1917 from YosysHQ/eddie/abc9_delay_check"Eddie Hung2020-05-141-4/+0
| * abc9: add flop boxes to basic $_DFF_P_ and $_DFF_N_ tooEddie Hung2020-05-147-24/+88
| * kernel: TimingInfo to clamp -ve setup/edge-sensitive delays to zeroEddie Hung2020-05-141-10/+6
| * abc9_ops: -prep_dff_map to error if async flop foundEddie Hung2020-05-142-9/+7
| * Uncomment negative setup times; clamp to zero for connectivityEddie Hung2020-05-141-13/+29
| * abc9: remove redundant wbflipEddie Hung2020-05-141-1/+0
| * xaiger: always sort input/output bits by port idEddie Hung2020-05-141-12/+10
| * abc9: generate $abc9_holes design instead of <name>$holesEddie Hung2020-05-143-18/+28
| * abc9_ops: more robustEddie Hung2020-05-141-8/+14
| * abc9: suppress warnings when no compatible + used flop boxes formedEddie Hung2020-05-143-38/+66
| * xilinx: update abc9_dff testsEddie Hung2020-05-141-18/+45
| * xilinx: remove no-longer-relevant testEddie Hung2020-05-141-91/+0
| * aiger/xaiger: use odd for negedge clk, even for posedgeEddie Hung2020-05-142-10/+13
| * abc9: cleanupEddie Hung2020-05-141-7/+11
| * Revert "ecp5: replace ecp5_ffinit with techmap rules + dff2dffs -match-init"Eddie Hung2020-05-143-220/+64
| * abc9_ops: -prep_dff_map to check $_DFF_[NP]_.Q drives module outputEddie Hung2020-05-141-1/+5
| * abc9_ops: do away with '$abc9_cells' selectionEddie Hung2020-05-142-40/+30
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