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-rw-r--r--techlibs/xilinx/synth_xilinx.cc117
1 files changed, 95 insertions, 22 deletions
diff --git a/techlibs/xilinx/synth_xilinx.cc b/techlibs/xilinx/synth_xilinx.cc
index b7c32d2e0..ef7660288 100644
--- a/techlibs/xilinx/synth_xilinx.cc
+++ b/techlibs/xilinx/synth_xilinx.cc
@@ -2,6 +2,7 @@
* yosys -- Yosys Open SYnthesis Suite
*
* Copyright (C) 2012 Clifford Wolf <clifford@clifford.at>
+ * (C) 2019 Eddie Hung <eddie@fpgeh.com>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@@ -77,6 +78,11 @@ 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 (MUXF[78]) for muxes at or\n");
+ log(" above this number of inputs (minimum value 2, recommended 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");
@@ -99,6 +105,7 @@ struct SynthXilinxPass : public ScriptPass
std::string top_opt, edif_file, blif_file, family;
bool flatten, retime, vpr, nobram, nodram, nosrl, nocarry, nowidelut, abc9;
+ int widemux;
void clear_flags() YS_OVERRIDE
{
@@ -116,6 +123,7 @@ struct SynthXilinxPass : public ScriptPass
nocarry = false;
nowidelut = false;
abc9 = false;
+ widemux = 0;
}
void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
@@ -186,6 +194,10 @@ struct SynthXilinxPass : public ScriptPass
nosrl = true;
continue;
}
+ if (args[argidx] == "-widemux" && argidx+1 < args.size()) {
+ widemux = std::stoi(args[++argidx]);
+ continue;
+ }
if (args[argidx] == "-abc9") {
abc9 = true;
continue;
@@ -197,6 +209,9 @@ struct SynthXilinxPass : public ScriptPass
if (family != "xcup" && family != "xcu" && family != "xc7" && family != "xc6s")
log_cmd_error("Invalid Xilinx -family setting: %s\n", family.c_str());
+ if (widemux != 0 && widemux < 2)
+ log_cmd_error("-widemux value must be 0 or >= 2.\n");
+
if (!design->full_selection())
log_cmd_error("This command only operates on fully selected designs!\n");
@@ -212,9 +227,9 @@ 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");
@@ -224,21 +239,41 @@ 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");
+ run("proc");
+ if (help_mode || flatten)
+ run("flatten", "(if -flatten)");
+ run("opt_expr");
+ run("opt_clean");
+ run("check");
+ run("opt");
+ if (help_mode)
+ run("wreduce [-keepdc]", "(option for '-widemux')");
+ else
+ run("wreduce" + std::string(widemux > 0 ? " -keepdc" : ""));
+ run("peepopt");
+ run("opt_clean");
+
+ 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 $pmux-es to the former
- if (!nosrl || help_mode)
- run("pmux2shiftx", "(skip if '-nosrl')");
+ // Also: wide multiplexer inference benefits from this too
+ if (!(nosrl && widemux == 0) || help_mode) {
+ run("pmux2shiftx", "(skip if '-nosrl' and '-widemux=0')");
+ run("clean", " (skip if '-nosrl' and '-widemux=0')");
+ }
+
+ run("techmap -map +/cmp2lut.v -D LUT_WIDTH=6");
+ run("alumacc");
+ run("share");
+ run("opt");
+ run("fsm");
+ run("opt -fast");
+ run("memory -nomap");
+ run("opt_clean");
}
if (check_label("bram", "(skip if '-nobram')")) {
@@ -256,43 +291,81 @@ struct SynthXilinxPass : public ScriptPass
}
if (check_label("fine")) {
- run("opt -fast -full");
+ if (widemux > 0)
+ run("opt -fast -mux_bool -undriven -fine"); // Necessary to omit -mux_undef otherwise muxcover
+ // performs less efficiently
+ else
+ run("opt -fast -full");
run("memory_map");
run("dffsr2dff");
run("dff2dffe");
+ if (help_mode) {
+ run("simplemap t:$mux", " ('-widemux' only)");
+ run("muxcover <internal options>, ('-widemux' only)");
+ }
+ else if (widemux > 0) {
+ run("simplemap t:$mux");
+ constexpr int cost_mux2 = 100;
+ std::string muxcover_args = stringf(" -nodecode -mux2=%d", cost_mux2);
+ switch (widemux) {
+ case 2: muxcover_args += stringf(" -mux4=%d -mux8=%d -mux16=%d", cost_mux2+1, cost_mux2+2, cost_mux2+3); break;
+ case 3:
+ case 4: muxcover_args += stringf(" -mux4=%d -mux8=%d -mux16=%d", cost_mux2*(widemux-1)-2, cost_mux2*(widemux-1)-1, cost_mux2*(widemux-1)); break;
+ case 5:
+ case 6:
+ case 7:
+ case 8: muxcover_args += stringf(" -mux8=%d -mux16=%d", cost_mux2*(widemux-1)-1, cost_mux2*(widemux-1)); break;
+ case 9:
+ case 10:
+ case 11:
+ case 12:
+ case 13:
+ case 14:
+ case 15:
+ default: muxcover_args += stringf(" -mux16=%d", cost_mux2*(widemux-1)-1); break;
+ }
+ run("muxcover " + muxcover_args);
+ }
run("opt -full");
if (!nosrl || help_mode) {
// shregmap operates on bit-level flops, not word-level,
// so break those down here
- run("simplemap t:$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");
}
if (check_label("map_luts")) {
run("opt_expr -mux_undef");
if (help_mode)
- run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(skip if 'nowidelut', only for '-retime')");
+ run("abc -luts 2:2,3,6:5[,10,20] [-dff]", "(option for 'nowidelut', option for '-retime')");
else if (abc9) {
if (family != "xc7")
log_warning("'synth_xilinx -abc9' currently supports '-family xc7' only.\n");
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-08 00:54:46 +0000