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Instead of MUXCY/XORCY use CARRY4 (with timing)

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Eddie Hung 2019-05-21 16:19:45 -07:00
parent 0f094fba08
commit ee8435b820
4 changed files with 20 additions and 11 deletions
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2
techlibs/xilinx/synth_xilinx.cc
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@ -261,6 +261,8 @@ struct SynthXilinxPass : public ScriptPass
if (vpr && !nocarry && !help_mode)
run("techmap -map +/xilinx/arith_map.v -D _EXPLICIT_CARRY");
else if (abc == "abc9" && !nocarry && !help_mode)
run("techmap -map +/xilinx/arith_map.v -D _CLB_CARRY", "(skip if '-nocarry')");
else if (!nocarry || help_mode)
run("techmap -map +/xilinx/arith_map.v", "(skip if '-nocarry')");