passes/equiv/equiv_opt.cc

   1 /*
   2  *  yosys -- Yosys Open SYnthesis Suite
   3  *
   4  *  Copyright (C) 2018  whitequark <whitequark@whitequark.org>
   5  *
   6  *  Permission to use, copy, modify, and/or distribute this software for any
   7  *  purpose with or without fee is hereby granted, provided that the above
   8  *  copyright notice and this permission notice appear in all copies.
   9  *
  10  *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  *
  18  */
  19
  20 #include "kernel/register.h"
  21
  22 USING_YOSYS_NAMESPACE
  23 PRIVATE_NAMESPACE_BEGIN
  24
  25 struct EquivOptPass:public ScriptPass
  26 {
  27         EquivOptPass() : ScriptPass("equiv_opt", "prove equivalence for optimized circuit") { }
  28
  29         void help() YS_OVERRIDE
  30         {
  31                 //   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
  32                 log("\n");
  33                 log("    equiv_opt [options] [command]\n");
  34                 log("\n");
  35                 log("This command checks circuit equivalence before and after an optimization pass.\n");
  36                 log("\n");
  37                 log("    -run <from_label>:<to_label>\n");
  38                 log("        only run the commands between the labels (see below). an empty\n");
  39                 log("        from label is synonymous to the start of the command list, and empty to\n");
  40                 log("        label is synonymous to the end of the command list.\n");
  41                 log("\n");
  42                 log("    -map <filename>\n");
  43                 log("        expand the modules in this file before proving equivalence. this is\n");
  44                 log("        useful for handling architecture-specific primitives.\n");
  45                 log("\n");
  46                 log("    -assert\n");
  47                 log("        produce an error if the circuits are not equivalent.\n");
  48                 log("\n");
  49                 log("    -multiclock\n");
  50                 log("        run clk2fflogic before equivalence checking.\n");
  51                 log("\n");
  52                 log("    -undef\n");
  53                 log("        enable modelling of undef states during equiv_induct.\n");
  54                 log("\n");
  55                 log("The following commands are executed by this verification command:\n");
  56                 help_script();
  57                 log("\n");
  58         }
  59
  60         std::string command, techmap_opts;
  61         bool assert, undef, multiclock;
  62
  63         void clear_flags() YS_OVERRIDE
  64         {
  65                 command = "";
  66                 techmap_opts = "";
  67                 assert = false;
  68                 undef = false;
  69                 multiclock = false;
  70         }
  71
  72         void execute(std::vector < std::string > args, RTLIL::Design * design) YS_OVERRIDE
  73         {
  74                 string run_from, run_to;
  75                 clear_flags();
  76
  77                 size_t argidx;
  78                 for (argidx = 1; argidx < args.size(); argidx++) {
  79                         if (args[argidx] == "-run" && argidx + 1 < args.size()) {
  80                                 size_t pos = args[argidx + 1].find(':');
  81                                 if (pos == std::string::npos)
  82                                         break;
  83                                 run_from = args[++argidx].substr(0, pos);
  84                                 run_to = args[argidx].substr(pos + 1);
  85                                 continue;
  86                         }
  87                         if (args[argidx] == "-map" && argidx + 1 < args.size()) {
  88                                 techmap_opts += " -map " + args[++argidx];
  89                                 continue;
  90                         }
  91                         if (args[argidx] == "-assert") {
  92                                 assert = true;
  93                                 continue;
  94                         }
  95                         if (args[argidx] == "-undef") {
  96                                 undef = true;
  97                                 continue;
  98                         }
  99                         if (args[argidx] == "-multiclock") {
 100                                 multiclock = true;
 101                                 continue;
 102                         }
 103                         break;
 104                 }
 105
 106                 for (; argidx < args.size(); argidx++) {
 107                         if (command.empty()) {
 108                                 if (args[argidx].compare(0, 1, "-") == 0)
 109                                         cmd_error(args, argidx, "Unknown option.");
 110                         } else {
 111                                 command += " ";
 112                         }
 113                         command += args[argidx];
 114                 }
 115
 116                 if (command.empty())
 117                         log_cmd_error("No optimization pass specified!\n");
 118
 119                 if (!design->full_selection())
 120                         log_cmd_error("This command only operates on fully selected designs!\n");
 121
 122                 log_header(design, "Executing EQUIV_OPT pass.\n");
 123                 log_push();
 124
 125                 run_script(design, run_from, run_to);
 126
 127                 log_pop();
 128         }
 129
 130         void script() YS_OVERRIDE
 131         {
 132                 if (check_label("run_pass")) {
 133                         run("hierarchy -auto-top");
 134                         run("design -save preopt");
 135                         if (help_mode)
 136                                 run("[command]");
 137                         else
 138                                 run(command);
 139                         run("design -stash postopt");
 140                 }
 141
 142                 if (check_label("prepare")) {
 143                         run("design -copy-from preopt  -as gold A:top");
 144                         run("design -copy-from postopt -as gate A:top");
 145                 }
 146
 147                 if ((!techmap_opts.empty() || help_mode) && check_label("techmap", "(only with -map)")) {
 148                         string opts;
 149                         if (help_mode)
 150                                 opts = " -map <filename> ...";
 151                         else
 152                                 opts = techmap_opts;
 153                         run("techmap -wb -D EQUIV -autoproc" + opts);
 154                 }
 155
 156                 if (check_label("prove")) {
 157                         if (multiclock || help_mode)
 158                                 run("clk2fflogic", "(only with -multiclock)");
 159                         run("equiv_make gold gate equiv");
 160                         if (help_mode)
 161                                 run("equiv_induct [-undef] equiv");
 162                         else if (undef)
 163                                 run("equiv_induct -undef equiv");
 164                         else
 165                                 run("equiv_induct equiv");
 166                         if (help_mode)
 167                                 run("equiv_status [-assert] equiv");
 168                         else if (assert)
 169                                 run("equiv_status -assert equiv");
 170                         else
 171                                 run("equiv_status equiv");
 172                 }
 173
 174                 if (check_label("restore")) {
 175                         run("design -load preopt");
 176                 }
 177         }
 178 } EquivOptPass;
 179
 180 PRIVATE_NAMESPACE_END