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-rw-r--r--techlibs/xilinx/synth_xilinx.cc92
1 files changed, 67 insertions, 25 deletions
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index 83c2edc86..2f3dfb012 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -79,6 +79,11 @@ struct SynthXilinxPass : public ScriptPass
log(" -nowidelut\n");
log(" do not use MUXF[78] resources to implement LUTs larger than LUT6s\n");
log("\n");
+ log(" -widemux <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");
log(" from label is synonymous to 'begin', and empty to label is\n");
@@ -101,6 +106,7 @@ struct SynthXilinxPass : public ScriptPass
std::string top_opt, edif_file, blif_file, arch;
bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut, abc9;
+ int widemux;
void clear_flags() YS_OVERRIDE
{
@@ -118,6 +124,7 @@ struct SynthXilinxPass : public ScriptPass
nocarry = false;
nowidelut = false;
abc9 = false;
+ widemux = 0;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -188,6 +195,10 @@ struct SynthXilinxPass : public ScriptPass
nosrl = true;
continue;
}
+ if (args[argidx] == "-widemux" && argidx+1 < args.size()) {
+ widemux = atoi(args[++argidx].c_str());
+ continue;
+ }
if (args[argidx] == "-abc9") {
abc9 = true;
continue;
@@ -199,6 +210,9 @@ 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 (widemux != 0 && widemux < 5)
+ log_cmd_error("-widemux value must be 0 or >= 5.\n");
+
if (!design->full_selection())
log_cmd_error("This command only operates on fully selected designs!\n");
@@ -214,9 +228,9 @@ struct SynthXilinxPass : public ScriptPass
{
if (check_label("begin")) {
if (vpr)
- run("read_verilog -lib -D _ABC -D_EXPLICIT_CARRY +/xilinx/cells_sim.v");
+ run("read_verilog -lib -icells -D _ABC -D_EXPLICIT_CARRY +/xilinx/cells_sim.v");
else
- run("read_verilog -lib -D _ABC +/xilinx/cells_sim.v");
+ run("read_verilog -lib -icells -D _ABC +/xilinx/cells_sim.v");
run("read_verilog -lib +/xilinx/cells_xtra.v");
@@ -226,26 +240,21 @@ struct SynthXilinxPass : public ScriptPass
run(stringf("hierarchy -check %s", top_opt.c_str()));
}
- if (check_label("flatten", "(with '-flatten' only)")) {
- if (flatten || help_mode) {
- run("proc");
- run("flatten");
- }
- }
-
if (check_label("coarse")) {
- run("synth -run coarse");
+ if (help_mode)
+ run("synth -run coarse [-flatten]", "(with '-flatten')");
+ else
+ run("synth -run coarse" + std::string(flatten ? "" : " -flatten"), "(with '-flatten')");
+
+ if (widemux > 0 || help_mode)
+ run("muxpack", " ('-widemux' 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
- if (!nosrl || help_mode)
- run("pmux2shiftx", "(skip if '-nosrl')");
-
- // Run a number of peephole optimisations, including one
- // that optimises $mul cells driving $shiftx's B input
- // and that aids wide mux analysis
- run("peepopt");
+ // Also: wide multiplexer inference benefits from this too
+ if (!(nosrl && widemux == 0) || help_mode)
+ run("pmux2shiftx", "(skip if '-nosrl' and '-widemux' < 5)");
}
if (check_label("bram", "(skip if '-nobram')")) {
@@ -267,32 +276,65 @@ struct SynthXilinxPass : public ScriptPass
run("memory_map");
run("dffsr2dff");
run("dff2dffe");
+ if (help_mode) {
+ run("simplemap t:$mux", " ('-widemux' only)");
+ run("muxcover <internal options>, ('-widemux' only)");
+ }
+ else if (widemux > 0) {
+ run("simplemap t:$mux");
+ std::string muxcover_args = " -nodecode";
+ switch (widemux) {
+ // NB: Cost of mux2 is 100; mux8 should cost between 3 and 4
+ // of those so that 4:1 muxes and below are implemented
+ // out of mux2s
+ case 5: muxcover_args += " -mux8=350 -mux16=400"; break;
+ case 6: muxcover_args += " -mux8=450 -mux16=500"; break;
+ case 7: muxcover_args += " -mux8=550 -mux16=600"; break;
+ case 8: muxcover_args += " -mux8=650 -mux16=700"; break;
+ case 9: muxcover_args += " -mux16=750"; break;
+ case 10: muxcover_args += " -mux16=850"; break;
+ case 11: muxcover_args += " -mux16=950"; break;
+ case 12: muxcover_args += " -mux16=1050"; break;
+ case 13: muxcover_args += " -mux16=1150"; break;
+ case 14: muxcover_args += " -mux16=1250"; break;
+ case 15: muxcover_args += " -mux16=1350"; break;
+ default: muxcover_args += " -mux16=1450"; break;
+ }
+ run("muxcover " + muxcover_args);
+ }
run("opt -full");
if (!nosrl || help_mode) {
// shregmap operates on bit-level flops, not word-level,
// so break those down here
- run("simplemap t:$dff t:$dffe", "(skip if '-nosrl')");
+ run("simplemap t:$dff t:$dffe", " (skip if '-nosrl')");
// shregmap with '-tech xilinx' infers variable length shift regs
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_args += " [-map +/xilinx/mux_map.v]";
+ else if (widemux > 0)
+ techmap_args += stringf(" -D MIN_MUX_INPUTS=%d -map +/xilinx/mux_map.v", widemux);
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 (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 -map +/xilinx/cells_map.v");
+ std::string techmap_args = "-map +/techmap.v -D _ABC -map +/xilinx/cells_map.v";
+ if (widemux > 0)
+ techmap_args += stringf(" -D MIN_MUX_INPUTS=%d", widemux);
+ run("techmap " + techmap_args);
run("clean");
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-06 06:49:24 +0000