diff options
Diffstat (limited to 'techlibs/xilinx/synth_xilinx.cc')
| -rw-r--r-- | techlibs/xilinx/synth_xilinx.cc | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index 5de2803e9..04b0dabca 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -72,6 +72,9 @@ struct SynthXilinxPass : public Pass log(" -nosrl\n"); log(" disable inference of shift registers\n"); log("\n"); + log(" -nomux\n"); + log(" disable inference of wide multiplexers\n"); + log("\n"); log(" -run <from_label>:<to_label>\n"); log(" only run the commands between the labels (see below). an empty\n"); log(" from label is synonymous to 'begin', and empty to label is\n"); @@ -119,7 +122,7 @@ struct SynthXilinxPass : public Pass log(" opt -fast\n"); log("\n"); log(" map_cells:\n"); - log(" pmux2shiftx\n"); + log(" pmux2shiftx (without '-nosrl' and '-nomux' only)\n"); log(" simplemap t:$dff t:$dffe (without '-nosrl' only)\n"); log(" opt_expr -mux_undef (without '-nosrl' only)\n"); log(" shregmap -tech xilinx -minlen 3 (without '-nosrl' only)\n"); @@ -161,6 +164,7 @@ struct SynthXilinxPass : public Pass bool nobram = false; bool nodram = false; bool nosrl = false; + bool nomux = false; size_t argidx; for (argidx = 1; argidx < args.size(); argidx++) @@ -209,6 +213,10 @@ struct SynthXilinxPass : public Pass nosrl = true; continue; } + if (args[argidx] == "-nomux") { + nomux = true; + continue; + } if (args[argidx] == "-abc9") { abc = "abc9"; continue; @@ -291,8 +299,9 @@ struct SynthXilinxPass : public Pass // 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 multiplexers inference benefits from this too - Pass::call(design, "pmux2shiftx"); + // 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, @@ -305,7 +314,10 @@ struct SynthXilinxPass : public Pass Pass::call(design, "shregmap -tech xilinx -minlen 3"); } - Pass::call(design, "techmap -map +/xilinx/cells_map.v"); + std::string define; + if (nomux) + define += " -D NO_MUXFN"; + Pass::call(design, "techmap" + define + " -map +/xilinx/cells_map.v"); Pass::call(design, "clean"); } |