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Merge pull request #1138 from YosysHQ/koriakin/xc7nocarrymux

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synth_xilinx: Add -nocarry and -nowidelut options
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Eddie Hung 2019-06-27 06:04:56 -07:00 • committed by GitHub
commit bb4ae8bc66
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2 changed files with 34 additions and 12 deletions
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34
techlibs/xilinx/synth_xilinx.cc
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@ -67,6 +67,12 @@ struct SynthXilinxPass : public ScriptPass
log(" -nosrl\n");
log(" disable inference of shift registers\n");
log("\n");
log(" -nocarry\n");
log(" do not use XORCY/MUXCY/CARRY4 cells in output netlist\n");
log("\n");
log(" -nowidelut\n");
log(" do not use MUXF[78] resources to implement LUTs larger than LUT6s\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");
@ -85,7 +91,7 @@ struct SynthXilinxPass : public ScriptPass
}
std::string top_opt, edif_file, blif_file, arch;
bool flatten, retime, vpr, nobram, nodram, nosrl;
bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut;
void clear_flags() YS_OVERRIDE
{
@ -98,6 +104,8 @@ struct SynthXilinxPass : public ScriptPass
nobram = false;
nodram = false;
nosrl = false;
nocarry = false;
nowidelut = false;
arch = "xc7";
}
@ -141,6 +149,14 @@ struct SynthXilinxPass : public ScriptPass
retime = true;
continue;
}
if (args[argidx] == "-nocarry") {
nocarry = true;
continue;
}
if (args[argidx] == "-nowidelut") {
nowidelut = true;
continue;
}
if (args[argidx] == "-vpr") {
vpr = true;
continue;
@ -237,10 +253,14 @@ struct SynthXilinxPass : public ScriptPass
run("shregmap -tech xilinx -minlen 3", "(skip if '-nosrl')");
}
if (!vpr || help_mode)
run("techmap -map +/techmap.v -map +/xilinx/arith_map.v");
else
run("techmap -map +/techmap.v +/xilinx/arith_map.v -D _EXPLICIT_CARRY");
if (help_mode)
run("techmap -map +/techmap.v [-map +/xilinx/arith_map.v]", "(skip if '-nocarry')");
else if (!nocarry) {
if (!vpr)
run("techmap -map +/techmap.v -map +/xilinx/arith_map.v");
else
run("techmap -map +/techmap.v -map +/xilinx/arith_map.v -D _EXPLICIT_CARRY");
}
run("opt -fast");
}
@ -252,7 +272,9 @@ struct SynthXilinxPass : public ScriptPass
if (check_label("map_luts")) {
if (help_mode)
run("abc -luts 2:2,3,6:5,10,20 [-dff]");
run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(skip if 'nowidelut', only for '-retime')");
else if (nowidelut)
run("abc -luts 2:2,3,6:5" + string(retime ? " -dff" : ""));
else
run("abc -luts 2:2,3,6:5,10,20" + string(retime ? " -dff" : ""));
run("clean");