diff options
Diffstat (limited to 'techlibs/xilinx/synth_xilinx.cc')
| -rw-r--r-- | techlibs/xilinx/synth_xilinx.cc | 68 |
1 files changed, 40 insertions, 28 deletions
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc index 9724dff94..2cf28fce1 100644 --- a/techlibs/xilinx/synth_xilinx.cc +++ b/techlibs/xilinx/synth_xilinx.cc @@ -73,8 +73,10 @@ struct SynthXilinxPass : public ScriptPass log(" -nosrl\n"); log(" disable inference of shift registers\n"); log("\n"); - log(" -nomux\n"); - log(" disable inference of wide multiplexers\n"); + log(" -minmuxf <int>\n"); + log(" enable inference of hard multiplexer resources (MuxFx) for muxes at or\n"); + log(" above this number of inputs (minimum value 5).\n"); + log(" default: 0 (no inference)\n"); log("\n"); log(" -run <from_label>:<to_label>\n"); log(" only run the commands between the labels (see below). an empty\n"); @@ -97,7 +99,8 @@ struct SynthXilinxPass : public ScriptPass } std::string top_opt, edif_file, blif_file, abc, arch; - bool flatten, retime, vpr, nocarry, nobram, nodram, nosrl, nomux; + bool flatten, retime, vpr, nocarry, nobram, nodram, nosrl; + int minmuxf; void clear_flags() YS_OVERRIDE { @@ -112,8 +115,8 @@ struct SynthXilinxPass : public ScriptPass nobram = false; nodram = false; nosrl = false; - nomux = false; arch = "xc7"; + minmuxf = 0; } void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE @@ -176,8 +179,8 @@ struct SynthXilinxPass : public ScriptPass nosrl = true; continue; } - if (args[argidx] == "-nomux") { - nomux = true; + if (args[argidx] == "-minmuxf" && argidx+1 < args.size()) { + minmuxf = atoi(args[++argidx].c_str()); continue; } if (args[argidx] == "-abc9") { @@ -191,6 +194,9 @@ struct SynthXilinxPass : public ScriptPass if (arch != "xcup" && arch != "xcu" && arch != "xc7" && arch != "xc6s") log_cmd_error("Invalid Xilinx -arch setting: %s\n", arch.c_str()); + if (minmuxf != 0 && minmuxf < 5) + log_cmd_error("-minmuxf value must be 0 or >= 5.\n"); + if (!design->full_selection()) log_cmd_error("This command only operates on fully selected designs!\n"); @@ -227,9 +233,9 @@ struct SynthXilinxPass : public ScriptPass run("check"); run("opt"); if (help_mode) - run("wreduce [c:* t:$mux %d]", "(no selection if -nomux)"); + run("wreduce [c:* t:$mux %d]", "(selection for '-minmuxf' only)"); else - run("wreduce" + std::string(nomux ? "" : " c:* t:$mux %d")); + run("wreduce" + std::string(minmuxf > 0 ? " c:* t:$mux %d" : "")); run("peepopt"); run("opt_clean"); run("alumacc"); @@ -240,15 +246,15 @@ struct SynthXilinxPass : public ScriptPass run("memory -nomap"); run("opt_clean"); - if (!nomux || help_mode) - run("muxpack", " (skip if '-nomux')"); + if (minmuxf > 0 || help_mode) + run("muxpack", " ('-minmuxf' only)"); // shregmap -tech xilinx can cope with $shiftx and $mux // cells for identifying variable-length shift registers, // so attempt to convert $pmux-es to the former // Also: wide multiplexer inference benefits from this too - if (!(nosrl && nomux) || help_mode) - run("pmux2shiftx", "(skip if '-nosrl' and '-nomux')"); + if (!(nosrl && minmuxf == 0) || help_mode) + run("pmux2shiftx", "(skip if '-nosrl' and '-minmuxf' < 5)"); } if (check_label("bram", "(skip if '-nobram')")) { @@ -270,12 +276,15 @@ struct SynthXilinxPass : public ScriptPass run("memory_map"); run("dffsr2dff"); run("dff2dffe"); - if (!nomux || help_mode) { - run("simplemap t:$mux", " (skip if -nomux)"); - // NB: Cost of mux2 is 100; mux8 should cost between 3 and 4 - // of those so that 4:1 muxes and below are implemented - // out of mux2s - run("muxcover -mux8=350 -mux16=400 -dmux=0", "(skip if -nomux)"); + if (minmuxf > 0 || help_mode) { + run("simplemap t:$mux", " ('-minmuxf' only)"); + if (minmuxf > 0 || help_mode) { + // NB: Cost of mux2 is 100; mux8 should cost between 3 and 4 + // of those so that 4:1 muxes and below are implemented + // out of mux2s + std::string muxcover_args = " -dmux=0 -mux8=350 -mux16=400"; + run("muxcover " + muxcover_args, "('-minmuxf' only)"); + } } run("opt -full"); @@ -287,26 +296,29 @@ struct SynthXilinxPass : public ScriptPass run("shregmap -tech xilinx -minlen 3", "(skip if '-nosrl')"); } - std::string techmap_files = " -map +/techmap.v"; + std::string techmap_args = " -map +/techmap.v"; if (help_mode) - techmap_files += " [-map +/xilinx/mux_map.v]"; - else if (!nomux) - techmap_files += " -map +/xilinx/mux_map.v"; + techmap_args += " [-map +/xilinx/mux_map.v]"; + else if (minmuxf > 0) + techmap_args += stringf(" -D MIN_MUX_INPUTS=%d -map +/xilinx/mux_map.v", minmuxf); if (help_mode) - techmap_files += " [-map +/xilinx/arith_map.v]"; + techmap_args += " [-map +/xilinx/arith_map.v]"; else if (!nocarry) { - techmap_files += " -map +/xilinx/arith_map.v"; + techmap_args += " -map +/xilinx/arith_map.v"; if (vpr) - techmap_files += " -D _EXPLICIT_CARRY"; + techmap_args += " -D _EXPLICIT_CARRY"; else if (abc == "abc9") - techmap_files += " -D _CLB_CARRY"; + techmap_args += " -D _CLB_CARRY"; } - run("techmap " + techmap_files); + run("techmap " + techmap_args); run("opt -fast"); } if (check_label("map_cells")) { - run("techmap -map +/techmap.v -D _ABC -map +/xilinx/cells_map.v"); + std::string techmap_args = "-map +/techmap.v -D _ABC -map +/xilinx/cells_map.v"; + if (minmuxf > 0) + techmap_args += stringf(" -D MIN_MUX_INPUTS=%d", minmuxf); + run("techmap " + techmap_args); run("clean"); } |