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Merge remote-tracking branch 'origin/master' into xc7dsp

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Eddie Hung 2019-07-10 15:58:01 -07:00
commit cea7441d8a
34 changed files with 738 additions and 275 deletions
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107
techlibs/xilinx/synth_xilinx.cc
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@ -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
@ -25,8 +26,8 @@
USING_YOSYS_NAMESPACE
PRIVATE_NAMESPACE_BEGIN
#define XC7_WIRE_DELAY "300" // Number with which ABC will map a 6-input gate
// to one LUT6 (instead of a LUT5 + LUT2)
#define XC7_WIRE_DELAY 300 // Number with which ABC will map a 6-input gate
// to one LUT6 (instead of a LUT5 + LUT2)
struct SynthXilinxPass : public ScriptPass
{
@ -81,8 +82,8 @@ struct SynthXilinxPass : public ScriptPass
log(" do not use DSP48E1s to implement multipliers and associated logic\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(" 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");
@ -198,7 +199,7 @@ struct SynthXilinxPass : public ScriptPass
continue;
}
if (args[argidx] == "-widemux" && argidx+1 < args.size()) {
widemux = atoi(args[++argidx].c_str());
widemux = std::stoi(args[++argidx]);
continue;
}
if (args[argidx] == "-abc9") {
@ -214,14 +215,17 @@ struct SynthXilinxPass : public ScriptPass
extra_args(args, argidx, design);
if (family != "xcup" && family != "xcu" && family != "xc7" && family != "xc6s")
log_cmd_error("Invalid Xilinx -family setting: %s\n", family.c_str());
log_cmd_error("Invalid Xilinx -family setting: '%s'.\n", family.c_str());
if (widemux != 0 && widemux < 5)
log_cmd_error("-widemux value must be 0 or >= 5.\n");
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");
if (abc9 && retime)
log_cmd_error("-retime option not currently compatible with -abc9!\n");
log_header(design, "Executing SYNTH_XILINX pass.\n");
log_push();
@ -254,24 +258,12 @@ struct SynthXilinxPass : public ScriptPass
run("opt_clean");
run("check");
run("opt");
run("wreduce");
if (help_mode)
run("wreduce [-keepdc]", "(option for '-widemux')");
else
run("wreduce" + std::string(widemux > 0 ? " -keepdc" : ""));
run("peepopt");
run("opt_clean");
run("share");
run("techmap -map +/cmp2lut.v -D LUT_WIDTH=4");
run("opt_expr");
run("opt_clean");
if (!nodsp || help_mode) {
run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=25 -D DSP_B_MAXWIDTH=18 -D DSP_NAME=$__MUL25X18");
run("clean");
run("techmap -map +/xilinx/dsp_map.v");
}
run("alumacc");
run("opt");
run("fsm");
run("opt -fast");
run("memory -nomap");
run("opt_clean");
if (widemux > 0 || help_mode)
run("muxpack", " ('-widemux' only)");
@ -280,8 +272,26 @@ struct SynthXilinxPass : public ScriptPass
// cells for identifying variable-length shift registers,
// so attempt to convert $pmux-es to the former
// Also: wide multiplexer inference benefits from this too
if (!(nosrl && widemux == 0) || help_mode)
run("pmux2shiftx", "(skip if '-nosrl' and '-widemux' < 5)");
if (!(nosrl && widemux == 0) || help_mode) {
run("pmux2shiftx", "(skip if '-nosrl' and '-widemux=0')");
run("clean", " (skip if '-nosrl' and '-widemux=0')");
}
run("techmap -map +/cmp2lut.v -D LUT_WIDTH=6");
if (!nodsp || help_mode) {
run("techmap -map +/mul2dsp.v -D DSP_A_MAXWIDTH=25 -D DSP_B_MAXWIDTH=18 -D DSP_NAME=$__MUL25X18");
run("clean");
run("techmap -map +/xilinx/dsp_map.v");
}
run("alumacc");
run("share");
run("opt");
run("fsm");
run("opt -fast");
run("memory -nomap");
run("opt_clean");
}
if (check_label("bram", "(skip if '-nobram')")) {
@ -299,7 +309,11 @@ 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");
@ -309,23 +323,24 @@ struct SynthXilinxPass : public ScriptPass
}
else if (widemux > 0) {
run("simplemap t:$mux");
std::string muxcover_args = " -nodecode";
constexpr int cost_mux2 = 100;
std::string muxcover_args = stringf(" -nodecode -mux2=%d", cost_mux2);
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;
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);
}
@ -368,14 +383,14 @@ struct SynthXilinxPass : public ScriptPass
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");
if (nowidelut)
run("abc9 -lut +/xilinx/abc_xc7_nowide.lut -box +/xilinx/abc_xc7.box -W " + std::string(XC7_WIRE_DELAY) + string(retime ? " -dff" : ""));
run("abc9 -lut +/xilinx/abc_xc7_nowide.lut -box +/xilinx/abc_xc7.box -W " + std::to_string(XC7_WIRE_DELAY));
else
run("abc9 -lut +/xilinx/abc_xc7.lut -box +/xilinx/abc_xc7.box -W " + std::string(XC7_WIRE_DELAY) + string(retime ? " -dff" : ""));
run("abc9 -lut +/xilinx/abc_xc7.lut -box +/xilinx/abc_xc7.box -W " + std::to_string(XC7_WIRE_DELAY));
}
else {
if (nowidelut)