mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-04-26 02:25:35 +00:00
Code Activity

Change synth_xilinx's -nomux to -minmuxf <int>

Browse source
This commit is contained in:
Eddie Hung 2019-06-24 10:04:01 -07:00
parent d54dceb547
commit 36e6da5396
3 changed files with 82 additions and 54 deletions
Download patch file Download diff file Expand all files Collapse all files

68
techlibs/xilinx/synth_xilinx.cc
View file

@ -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");
}