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| author | Eddie Hung <eddie@fpgeh.com> | 2019-04-26 16:09:54 -0700 |
|---|---|---|
| committer | Eddie Hung <eddie@fpgeh.com> | 2019-04-26 16:09:54 -0700 |
| commit | e31e21766d3bf323ce61754a28ac58ec7118b9c0 (patch) | |
| tree | 70aa50c1e5ee31b3f57d9441e4c29627fb1a4b90 /techlibs/xilinx/synth_xilinx.cc | |
| parent | 76b7c5d4cc8b1fe942e50302b0de1e9f08815324 (diff) | |
| download | yosys-e31e21766d3bf323ce61754a28ac58ec7118b9c0.tar.gz yosys-e31e21766d3bf323ce61754a28ac58ec7118b9c0.tar.bz2 yosys-e31e21766d3bf323ce61754a28ac58ec7118b9c0.zip | |
Try a different approach with 'muxcover'
Diffstat (limited to 'techlibs/xilinx/synth_xilinx.cc')
| -rw-r--r-- | techlibs/xilinx/synth_xilinx.cc | 42 |
1 files changed, 21 insertions, 21 deletions
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index 524c54d3b..5652806f7 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -292,36 +292,37 @@ struct SynthXilinxPass : public Pass Pass::call(design, "dffsr2dff"); Pass::call(design, "dff2dffe"); + // shregmap -tech xilinx can cope with $shiftx and $mux + // cells for identifying variable-length shift registers, + // so attempt to convert $pmux-es to the former + // Also: wide multiplexer inference benefits from this too + if (!nosrl || !nomux) + Pass::call(design, "pmux2shiftx"); + + Pass::call(design, "opt -full"); if (!nocarry) { if (vpr) - Pass::call(design, "techmap -map +/xilinx/arith_map.v -D _EXPLICIT_CARRY"); + Pass::call(design, "techmap -map +/techmap.v -D _EXPLICIT_CARRY -map +/xilinx/arith_map.v"); else - Pass::call(design, "techmap -map +/xilinx/arith_map.v"); + Pass::call(design, "techmap -map +/techmap.v -map +/xilinx/arith_map.v"); + } + else { + Pass::call(design, "techmap"); } + Pass::call(design, "opt -fast"); + + // shregmap with '-tech xilinx' infers variable length shift regs + if (!nosrl) + Pass::call(design, "shregmap -tech xilinx -minlen 3"); + + if (!nomux) + Pass::call(design, "muxcover -mux8 -mux16"); Pass::call(design, "opt -fast"); } if (check_label(active, run_from, run_to, "map_cells")) { - // shregmap -tech xilinx can cope with $shiftx and $mux - // cells for identifying variable-length shift registers, - // so attempt to convert $pmux-es to the former - // Also: wide multiplexer inference benefits from this too - if (!nosrl || !nomux) - Pass::call(design, "pmux2shiftx"); - - if (!nosrl) { - // shregmap operates on bit-level flops, not word-level, - // so break those down here - Pass::call(design, "simplemap t:$dff t:$dffe"); - // pmux2shiftx can leave behind a $pmux with a single entry - // -- need this to clean that up before shregmap - Pass::call(design, "opt_expr -mux_undef"); - // shregmap with '-tech xilinx' infers variable length shift regs - Pass::call(design, "shregmap -tech xilinx -minlen 3"); - } - std::string define; if (nomux) define += " -D NO_MUXFN"; @@ -331,7 +332,6 @@ struct SynthXilinxPass : public Pass if (check_label(active, run_from, run_to, "map_luts")) { - Pass::call(design, "opt -full"); Pass::call(design, "techmap -map +/techmap.v -D _NO_POS_SR -map +/xilinx/ff_map.v"); if (abc == "abc9") Pass::call(design, abc + " -lut +/xilinx/abc.lut -box +/xilinx/abc.box" + string(retime ? " -dff" : "")); |