nsz Git - libfirm/blob - ir/be/scripts/generate_regalloc_if.pl

   1 #!/usr/bin/perl -w
   2
   3 # This script generates C code which creates ands sets up functions and
   4 # data structures for the register allocator.
   5 # Creation: 2005/11/14
   6 # $Id$
   7
   8 use strict;
   9 use Data::Dumper;
  10
  11 my $specfile   = $ARGV[0];
  12 my $target_dir = $ARGV[1];
  13
  14 our $arch;
  15 our %reg_classes;
  16 our %nodes;
  17 our %cpu;
  18
  19 # include spec file
  20
  21 my $return;
  22
  23 no strict "subs";
  24 unless ($return = do $specfile) {
  25         warn "couldn't parse $specfile: $@" if $@;
  26         warn "couldn't do $specfile: $!"    unless defined $return;
  27         warn "couldn't run $specfile"       unless $return;
  28 }
  29 use strict "subs";
  30
  31 my $target_c   = $target_dir."/gen_".$arch."_regalloc_if.c";
  32 my $target_h   = $target_dir."/gen_".$arch."_regalloc_if.h";
  33 my $target_h_t = $target_dir."/gen_".$arch."_regalloc_if_t.h";
  34
  35 # helper function
  36 sub translate_reg_type {
  37         my $t = shift;
  38
  39         if ($t == 0) {
  40                 return "arch_register_type_none";
  41         }
  42         else {
  43                 my @types;
  44
  45                 if ($t & 1) {
  46                         push(@types, "arch_register_type_caller_save");
  47                 }
  48
  49                 if ($t & 2) {
  50                         push(@types, "arch_register_type_callee_save");
  51                 }
  52
  53                 if ($t & 4) {
  54                         push(@types, "arch_register_type_ignore");
  55                 }
  56
  57                 if ($t & 8) {
  58                         push(@types, "arch_register_type_joker");
  59                 }
  60
  61                 if ($t & 16) {
  62                         push(@types, "arch_register_type_virtual");
  63                 }
  64
  65                 return join(" | ", @types);
  66         }
  67 }
  68
  69 # stacks for output
  70 my @obst_regtypes_def; # stack for the register type variables definitions
  71 my @obst_regtypes_decl;# stack for the register type variables declarations
  72 my @obst_regclasses;   # stack for the register class variables
  73 my @obst_classdef;     # stack to define a name for a class index
  74 my @obst_regdef;       # stack to define a name for a register index
  75 my @obst_reginit;      # stack for the register type inits
  76 my @obst_req;          # stack for the register requirements
  77 my @obst_limit_func;   # stack for functions to return a subset of a register class
  78 my @obst_defreq_head;  # stack for prototypes of default requirement function
  79 my @obst_header_all;   # stack for some extern struct defs needed for bearch_$arch include
  80 my @obst_requirement_def;  # stack for requirement name defines
  81
  82 my $numregs;
  83 my $class_ptr;
  84 my $class_idx = 0;
  85
  86 my $tmp;
  87
  88 my %reg2class;
  89
  90 # there is a default NONE requirement
  91 $tmp = "/* Default NONE register requirements */\n";
  92 $tmp .= "const $arch\_register_req_t $arch\_default_req_none = {\n";
  93 $tmp .= "  {\n";
  94 $tmp .= "    arch_register_req_type_none,  /* register type  */\n";
  95 $tmp .= "    NULL,                         /* register class */\n";
  96 $tmp .= "    NULL,                         /* limit function */\n";
  97 $tmp .= "    NULL,                         /* limit environment */\n";
  98 $tmp .= "    NULL,                         /* node for same */\n";
  99 $tmp .= "    NULL                          /* node for different */\n";
 100 $tmp .= "  },\n";
 101 $tmp .= "  0,                              /* same pos */\n";
 102 $tmp .= "  0                               /* different pos */\n";
 103 $tmp .= "};\n\n";
 104 push(@obst_req, $tmp);
 105 push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_none;\n");
 106
 107 push(@obst_classdef, "enum reg_classes {\n");
 108
 109 my $class_mode;
 110
 111 # assure, the initialization is done only once
 112 push(@obst_reginit, "  static int run_once = 0;\n");
 113 push(@obst_reginit, "\n");
 114 push(@obst_reginit, "  if (run_once)\n    return;\n");
 115 push(@obst_reginit, "  run_once = 1;\n");
 116
 117 # generate register type and class variable, init function and default requirements
 118 foreach my $class_name (keys(%reg_classes)) {
 119         my @class         = @{ $reg_classes{"$class_name"} };
 120         my $old_classname = $class_name;
 121
 122         $class_name = $arch."_".$class_name;
 123         $numregs    = "N_".$class_name."_REGS";
 124         $class_ptr  = "&".$arch."_reg_classes[CLASS_".$class_name."]";
 125         $class_mode = pop(@class)->{"mode"};
 126
 127         push(@obst_regtypes_decl, "extern arch_register_t ".$class_name."_regs[$numregs];\n");
 128         push(@obst_regtypes_def, "arch_register_t ".$class_name."_regs[$numregs];\n");
 129
 130         push(@obst_classdef, "  CLASS_$class_name = $class_idx,\n");
 131         push(@obst_regclasses, "{ \"$class_name\", $numregs, NULL, ".$class_name."_regs }");
 132
 133         # there is a default NORMAL requirement for each class
 134         $tmp  = "/* Default NORMAL register requirements for class $class_name */\n";
 135         $tmp .= "const $arch\_register_req_t $arch\_default_req_$class_name = {\n";
 136         $tmp .= "  {\n";
 137         $tmp .= "    arch_register_req_type_normal,\n";
 138         $tmp .= "    $class_ptr,\n";
 139         $tmp .= "    NULL,                    /* limit function */ \n";
 140         $tmp .= "    NULL,                    /* limit environment */\n";
 141         $tmp .= "    NULL,                    /* node for same */\n";
 142         $tmp .= "    NULL                     /* node for different */\n";
 143         $tmp .= "  },\n";
 144         $tmp .= "  0,                         /* same pos */\n";
 145         $tmp .= "  0                          /* different pos */\n";
 146         $tmp .= "};\n\n";
 147         push(@obst_req, $tmp);
 148         push(@obst_header_all, "extern const $arch\_register_req_t $arch\_default_req_$class_name;\n");
 149
 150         my $idx = 0;
 151         push(@obst_reginit, "  /* Init of all registers in class '$class_name' */\n\n");
 152         push(@obst_reginit, "  /* set largest possible mode for '$class_name' */\n");
 153         push(@obst_reginit, "  $arch\_reg_classes[CLASS_".$class_name."].mode = $class_mode;\n\n");
 154         push(@obst_regdef, "enum reg_".$class_name."_values {\n");
 155         foreach (@class) {
 156                 # For each class we build for each of it's member registers a limit function
 157                 # which limits the class to this particular register. We also build the
 158                 # corresponding requirement structs.
 159                 # We need those functions to set register requirements on demand in transformation
 160                 # esp. for Call and RegParams where we can mix int and float parameters.
 161
 162                 my $limit_func_name = $arch."_limit_".$class_name."_".$_->{"name"};
 163
 164                 # push the function prototype
 165                 $tmp = "void $limit_func_name(void *_unused, bitset_t *bs)";
 166                 push(@obst_defreq_head, $tmp.";\n");
 167
 168                 # push the function definition
 169                 $tmp .= " {\n";
 170                 $tmp .= "    bs = bitset_clear_all(bs);\n";
 171                 $tmp .= "    bitset_set(bs, REG_".uc($_->{"name"}).");\n";  # REGISTER to index assignment is done some lines down
 172                 $tmp .= "}\n\n";
 173                 push(@obst_limit_func, $tmp);
 174
 175                 # push the default requirement struct
 176                 $tmp  = "const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}." = {\n";
 177                 $tmp .= "  {\n";
 178                 $tmp .= "    arch_register_req_type_limited,\n";
 179                 $tmp .= "    $class_ptr,\n";
 180                 $tmp .= "    $limit_func_name,\n";
 181                 $tmp .= "    NULL,                     /* limit environment */\n";
 182                 $tmp .= "    NULL,                     /* node for same */\n";
 183                 $tmp .= "    NULL                      /* node for different */\n";
 184                 $tmp .= "  },\n";
 185                 $tmp .= "  0,                          /* same pos */\n";
 186                 $tmp .= "  0                           /* different pos */\n";
 187                 $tmp .= "};\n\n";
 188                 push(@obst_req, $tmp);
 189                 push(@obst_header_all,"extern const $arch\_register_req_t $arch\_default_req_$class_name\_".$_->{"name"}.";\n");
 190
 191                 # realname is name if not set by user
 192                 $_->{"realname"} = $_->{"name"} if (! exists($_->{"realname"}));
 193
 194                 $reg2class{$_->{"name"}} = { "class" => $old_classname, "index" => $idx }; # remember reg to class for later use
 195                 push(@obst_regdef, "  REG_".uc($_->{"name"})." = $idx,\n");
 196                 push(@obst_reginit, "  ".$class_name."_regs[$idx].name      = \"".$_->{"realname"}."\";\n");
 197                 push(@obst_reginit, "  ".$class_name."_regs[$idx].reg_class = $class_ptr;\n");
 198                 push(@obst_reginit, "  ".$class_name."_regs[$idx].index     = $idx;\n");
 199                 push(@obst_reginit, "  ".$class_name."_regs[$idx].type      = ".translate_reg_type($_->{"type"}).";\n");
 200                 push(@obst_reginit, "  ".$class_name."_regs[$idx].data      = ".get_execunit_variable_name($_->{"unit"}).";\n");
 201                 push(@obst_reginit, "\n");
 202                 $idx++;
 203         }
 204         push(@obst_regdef, "  $numregs = $idx\n");
 205         push(@obst_regdef, "};\n\n");
 206
 207         $class_idx++;
 208 }
 209
 210 push(@obst_classdef, "  N_CLASSES = ".scalar(keys(%reg_classes))."\n");
 211 push(@obst_classdef, "};\n\n");
 212
 213 # generate node-register constraints
 214 foreach my $op (keys(%nodes)) {
 215         my %n = %{ $nodes{"$op"} };
 216
 217         next if (!exists($n{"reg_req"}));
 218
 219         $op = $arch."_".$op;
 220
 221         push(@obst_req, "/* IN requirements for '$op' */\n");
 222         # check for argument requirements
 223         if (exists($n{"reg_req"}{"in"})) {
 224                 generate_requirements(\%n, $op, "in");
 225         }
 226
 227         push(@obst_req, "/* OUT requirements for '$op' */\n");
 228         # check for result requirements
 229         if (exists($n{"reg_req"}{"out"})) {
 230                 generate_requirements(\%n, $op, "out");
 231         }
 232 }
 233
 234
 235
 236 # generate header _t (internal usage) file
 237 open(OUT, ">$target_h_t") || die("Could not open $target_h_t, reason: $!\n");
 238
 239 my $creation_time = localtime(time());
 240
 241 $tmp = uc($arch);
 242
 243 print OUT<<EOF;
 244 #ifndef _GEN_$tmp\_REGALLOC_IF_T_H_
 245 #define _GEN_$tmp\_REGALLOC_IF_T_H_
 246
 247 /**
 248  * Generated register classes from spec.
 249  *
 250  * DO NOT EDIT THIS FILE, your changes will be lost.
 251  * Edit $specfile instead.
 252  * created by: $0 $specfile $target_dir
 253  * date:       $creation_time
 254  */
 255
 256 EOF
 257
 258 print OUT @obst_requirement_def;
 259
 260 print OUT "\n#endif /* _GEN_$tmp\_REGALLOC_IF_T_H_ */\n";
 261
 262
 263
 264 # generate header (external usage) file
 265 open(OUT, ">$target_h") || die("Could not open $target_h, reason: $!\n");
 266
 267 $creation_time = localtime(time());
 268
 269 print OUT<<EOF;
 270 #ifndef _GEN_$tmp\_REGALLOC_IF_H_
 271 #define _GEN_$tmp\_REGALLOC_IF_H_
 272
 273 /**
 274  * Contains additional external requirements defs for external includes.
 275  *
 276  * DO NOT EDIT THIS FILE, your changes will be lost.
 277  * Edit $specfile instead.
 278  * created by: $0 $specfile $target_dir
 279  * date:       $creation_time
 280  */
 281
 282 #include "../bearch.h"
 283 #include "$arch\_nodes_attr.h"
 284
 285 EOF
 286
 287 print OUT @obst_regdef, "\n";
 288
 289 print OUT @obst_classdef, "\n";
 290
 291 print OUT @obst_regtypes_decl, "\n";
 292
 293 print OUT "extern arch_register_class_t $arch\_reg_classes[N_CLASSES];\n\n";
 294
 295 print OUT "void ".$arch."_register_init(void *isa_ptr);\n\n";
 296
 297 print OUT @obst_header_all, "\n";
 298
 299 print OUT @obst_defreq_head, "\n";
 300
 301 print OUT "\n#endif /* _GEN_$tmp\_REGALLOC_IF_H_ */\n";
 302
 303 close(OUT);
 304
 305
 306
 307 # generate c file
 308 open(OUT, ">$target_c") || die("Could not open $target_c, reason: $!\n");
 309
 310 $creation_time = localtime(time());
 311
 312 print OUT<<EOF;
 313 /**
 314  * The generated interface for the register allocator.
 315  * Contains register classes and types and register constraints
 316  * for all nodes where constraints were given in spec.
 317  *
 318  * DO NOT EDIT THIS FILE, your changes will be lost.
 319  * Edit $specfile instead.
 320  * created by: $0 $specfile $target_dir
 321  * date:       $creation_time
 322  */
 323
 324 #ifdef HAVE_CONFIG_H
 325 #include "config.h"
 326 #endif
 327
 328 #include "gen_$arch\_regalloc_if.h"
 329 #include "gen_$arch\_machine.h"  /* we need this, as there can be units assigned to registers */
 330 #include "bearch_$arch\_t.h"     /* we need this to put the caller saved registers into the isa set */
 331 #include "$arch\_map_regs.h"
 332 #include "irmode.h"
 333
 334 EOF
 335
 336 print OUT "arch_register_class_t $arch\_reg_classes[] = {\n  ".join(",\n  ", @obst_regclasses)."\n};\n\n";
 337
 338 print OUT @obst_regtypes_def, "\n";
 339
 340 print OUT "void ".$arch."_register_init(void *isa_ptr) {\n";
 341 print OUT @obst_reginit;
 342 print OUT "}\n\n";
 343
 344 print OUT @obst_limit_func;
 345
 346 print OUT @obst_req;
 347
 348 close(OUT);
 349
 350 ###
 351 # Remember the register class for each index in the given requirements.
 352 # We need this information for requirements like "in_sX" or "out_dX"
 353 # @return array of classes corresponding to the requirement for each index
 354 ###
 355 sub build_inout_idx_class {
 356         my $n     = shift;
 357         my $op    = shift;
 358         my $inout = shift;
 359         my @idx_class;
 360
 361         if (exists($n->{"reg_req"}{"$inout"})) {
 362                 my @reqs = @{ $n->{"reg_req"}{"$inout"} };
 363
 364                 for (my $idx = 0; $idx <= $#reqs; $idx++) {
 365                         my $class = undef;
 366
 367                         if ($reqs[$idx] eq "none") {
 368                                 $class = "none";
 369                         }
 370                         elsif (is_reg_class($reqs[$idx])) {
 371                                 $class = $reqs[$idx];
 372                         }
 373                         else {
 374                                 my @regs = split(/ /, $reqs[$idx]);
 375 GET_CLASS:              foreach my $reg (@regs) {
 376                                         if ($reg =~ /!?(in|out)\_r\d+/ || $reg =~ /!in/) {
 377                                                 $class = "UNKNOWN_CLASS";
 378                                         }
 379                                         else {
 380                                                 $class = get_reg_class($reg);
 381                                                 if (!defined $class) {
 382                                                         die("Could not get ".uc($inout)." register class for '$op' pos $idx (reg $reg) ... exiting.\n");
 383                                                 }
 384                                                 else {
 385                                                         last GET_CLASS;
 386                                                 } # !defined class
 387                                         } # if (reg =~ ...
 388                                 } # foreach
 389                         } # if
 390
 391                         push(@idx_class, $class);
 392                 } # for
 393         } # if
 394
 395         return @idx_class;
 396 }
 397
 398 ###
 399 # Generates the requirements for the given description
 400 ###
 401 sub generate_requirements {
 402         my $n     = shift;
 403         my $op    = shift;
 404         my $inout = shift;
 405
 406         # get classes for the complementary direction
 407         my $outin     = ($inout eq "in") ? "out" : "in";
 408
 409         my @reqs = @{ $n->{"reg_req"}{"$inout"} };
 410
 411         for (my $idx = 0; $idx <= $#reqs; $idx++) {
 412                 my $class = undef;
 413
 414                 my $tmp2 = "const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx = ";
 415                 my $tmp  = "#define ".$op."_reg_req_$inout\_$idx ";
 416
 417                 if ($reqs[$idx] eq "none") {
 418                         $tmp .= "&$arch\_default_req_none\n";
 419                 }
 420                 elsif ($reqs[$idx] =~ /^new_reg_(.*)$/) {
 421                         if (is_reg_class($1)) {
 422                                 $tmp  .=  "&_".$op."_reg_req_$inout\_$idx\n";
 423                                 $tmp2 .= "{\n";
 424                                 $tmp2 .= "  {\n";
 425                                 $tmp2 .= "    arch_register_req_type_should_be_different_from_all,\n";
 426                                 $tmp2 .= "    &$arch\_reg_classes[CLASS_$arch\_".$1."],\n";
 427                                 $tmp2 .= "    NULL,        /* limit function */\n";
 428                                 $tmp2 .= "    NULL,        /* limit environment */\n";
 429                                 $tmp2 .= "    NULL,        /* same node */\n";
 430                                 $tmp2 .= "    NULL         /* different node */\n";
 431                                 $tmp2 .= "  },\n";
 432                                 $tmp2 .= "  0,\n";
 433                                 $tmp2 .= "  0\n";
 434                                 $tmp2 .= "};\n";
 435
 436                                 push(@obst_req, $tmp2."\n");
 437                                 push(@obst_header_all, "extern const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx;\n");
 438                         }
 439                         else {
 440                                 print STDERR "Invalid register class '$1' given in OUT requirement $idx for '$op'.\n";
 441                         }
 442                 }
 443                 elsif (is_reg_class($reqs[$idx])) {
 444                         $tmp .= "&$arch\_default_req_".$arch."_".$reqs[$idx]."\n";
 445                 }
 446                 else {
 447                         my @req_type_mask;
 448                         my ($class, $has_limit, $same_pos, $different_pos) = build_subset_class_func($n, $op, $idx, (($inout eq "in") ? 1 : 0), $reqs[$idx]);
 449
 450                         if (!defined($class)) {
 451                                 die("Could not build subset for ".uc($inout)." requirements '$op' pos $idx ... exiting.\n");
 452                         }
 453
 454                         if ($has_limit) {
 455                                 push(@req_type_mask, "arch_register_req_type_limited");
 456                         }
 457                         if (defined($same_pos)) {
 458                                 push(@req_type_mask, "arch_register_req_type_should_be_same");
 459                         }
 460                         if (defined($different_pos)) {
 461                                 if ($different_pos == 666) {
 462                                         push(@req_type_mask, "arch_register_req_type_should_be_different_from_all");
 463                                         undef $different_pos;
 464                                 }
 465                                 else {
 466                                         push(@req_type_mask, "arch_register_req_type_should_be_different");
 467                                 }
 468                         }
 469
 470                         $tmp  .= "&_".$op."_reg_req_$inout\_$idx\n";
 471                         $tmp2 .= "{\n";
 472                         $tmp2 .= "  {\n";
 473                         $tmp2 .= "    ".join(" | ", @req_type_mask).",\n";
 474                         $tmp2 .= "    &$arch\_reg_classes[CLASS_$arch\_".$class."],\n";
 475                         $tmp2 .= "    ".($has_limit ? "limit_reg_".$op."_$inout\_".$idx : "NULL").",\n";
 476                         $tmp2 .= "    NULL,        /* limit environment */\n";
 477                         $tmp2 .= "    NULL,        /* same node */\n";
 478                         $tmp2 .= "    NULL         /* different node */\n";
 479                         $tmp2 .= "  },\n";
 480                         $tmp2 .= "  ".(defined($same_pos) ? $same_pos : "0").",\n";
 481                         $tmp2 .= "  ".(defined($different_pos) ? $different_pos : "0")."\n";
 482                         $tmp2 .= "};\n";
 483
 484                         push(@obst_req, $tmp2."\n");
 485                         push(@obst_header_all, "extern const $arch\_register_req_t _".$op."_reg_req_$inout\_$idx;\n");
 486                 }
 487
 488                 push(@obst_requirement_def, $tmp);
 489         }
 490
 491 }
 492
 493 ###
 494 # Determines whether $name is a specified register class or not.
 495 # @return 1 if name is register class, 0 otherwise
 496 ###
 497 sub is_reg_class {
 498         my $name = shift;
 499         return 1 if exists($reg_classes{"$name"});
 500         return 0;
 501 }
 502
 503 ###
 504 # Returns the register class for a given register.
 505 # @return class or undef
 506 ###
 507 sub get_reg_class {
 508         my $reg = shift;
 509         $reg = substr($reg, 1) if ($reg =~ /!.*/);
 510         return $reg2class{"$reg"}{"class"} if (exists($reg2class{"$reg"}));
 511         return undef;
 512 }
 513
 514 ###
 515 # Returns the index of a given register within it's register class.
 516 # @return index or undef
 517 ###
 518 sub get_reg_index {
 519         my $reg = shift;
 520         return $reg2class{"$reg"}{"index"} if (exists($reg2class{"$reg"}));
 521         return undef;
 522 }
 523
 524 ###
 525 # Generates the function for a given $op and a given IN-index
 526 # which returns a subset of possible register from a register class
 527 # @return classname from which the subset is derived or undef and
 528 #         pos which corresponds to in/out reference position or undef
 529 ###
 530 sub build_subset_class_func {
 531         my $neg           = undef;
 532         my $class         = undef;
 533         my $has_limit     = 0;
 534         my $same_pos      = undef;
 535         my $different_pos = undef;
 536         my $temp;
 537         my @obst_init;
 538         my @obst_limits;
 539         my @obst_ignore;
 540
 541
 542         # build function header
 543         my $n   = shift;
 544         my $op  = shift;
 545         my $idx = shift;
 546         my $in  = shift;
 547
 548         my $outin = $in ? "out" : "in";
 549         my @regs  = split(/ /, shift);
 550
 551         my @idx_class = build_inout_idx_class($n, $op, $outin);
 552
 553         # set/unset registers
 554 CHECK_REQS: foreach (@regs) {
 555                 if (/(!)?$outin\_r(\d+)/) {
 556                         if (($1 && defined($different_pos)) || (!$1 && defined($same_pos))) {
 557                                 print STDERR "Multiple in/out references of same type in one requirement not allowed.\n";
 558                                 return (undef, undef, undef, undef);
 559                         }
 560
 561                         if ($1) {
 562                                 $different_pos = $in ? -$2 : $2 - 1;
 563                         }
 564                         else {
 565                                 $same_pos = $in ? -$2 : $2 - 1;
 566                         }
 567
 568                         $class = $idx_class[$2 - 1];
 569                         next CHECK_REQS;
 570                 }
 571                 elsif (/!in/) {
 572                         $class = $idx_class[0];
 573                         return ($class, 0, undef, 666);
 574                 }
 575
 576                 # check for negate
 577                 if (substr($_, 0, 1) eq "!") {
 578                         if (defined($neg) && $neg == 0) {
 579                                 # we have seen a positiv constraint as first one but this one is negative
 580                                 # this doesn't make sense
 581                                 print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
 582                                 return (undef, undef, undef, undef);
 583                         }
 584
 585                         if (!defined($neg)) {
 586                                 $has_limit = 1;
 587                                 push(@obst_init, "  bs = bitset_set_all(bs);     /* allow all register (negative constraints given) */\n");
 588                         }
 589
 590                         $_   = substr($_, 1); # skip '!'
 591                         $neg = 1;
 592                 }
 593                 else {
 594                         if (defined($neg) && $neg == 1) {
 595                                 # we have seen a negative constraint as first one but this one is positive
 596                                 # this doesn't make sense
 597                                 print STDERR "Mixed positive and negative constraints for the same slot are not allowed.\n";
 598                                 return (undef, undef, undef, undef);
 599                         }
 600
 601                         if (!defined($neg)) {
 602                                 $has_limit = 1;
 603                                 push(@obst_init, "  bs = bitset_clear_all(bs);   /* disallow all register (positive constraints given) */\n");
 604                         }
 605                         $neg = 0;
 606                 }
 607
 608                 # check if register belongs to one of the given classes
 609                 $temp = get_reg_class($_);
 610                 if (!defined($temp)) {
 611                         print STDERR "Unknown register '$_'!\n";
 612                         return (undef, undef, undef, undef);
 613                 }
 614
 615                 # set class
 616                 if (!defined($class)) {
 617                         $class = $temp;
 618                 }
 619                 elsif ($class ne $temp) {
 620                         # all registers must belong to the same class
 621                         print STDERR "Registerclass mismatch. '$_' is not member of class '$class'.\n";
 622                         return (undef, undef, undef, undef);
 623                 }
 624
 625                 if ($neg == 1) {
 626                         $has_limit = 1;
 627                         push(@obst_limits, "  bitset_clear(bs, ".get_reg_index($_).");         /* disallow $_ */\n");
 628                 }
 629                 else {
 630                         $has_limit = 1;
 631                         push(@obst_limits, "  bitset_set(bs, ".get_reg_index($_).");           /* allow $_ */\n");
 632                 }
 633         }
 634
 635         my @cur_class = @{ $reg_classes{"$class"} };
 636         for (my $idx = 0; $idx <= $#cur_class; $idx++) {
 637                 if (defined($cur_class[$idx]{"type"}) && ($cur_class[$idx]{"type"} & 4)) {
 638                         push(@obst_ignore, "  bitset_clear(bs, ".get_reg_index($cur_class[$idx]{"name"}).");");
 639                         push(@obst_ignore, "         /* disallow ignore reg ".$cur_class[$idx]{"name"}." */\n");
 640                 }
 641         }
 642
 643         if ($has_limit == 1) {
 644                 push(@obst_header_all, "void limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(void *_unused, bitset_t *bs);\n");
 645
 646                 push(@obst_limit_func, "/* limit the possible registers for ".($in ? "IN" : "OUT")." $idx at op $op */\n");
 647                 push(@obst_limit_func, "void limit_reg_".$op."_".($in ? "in" : "out")."_".$idx."(void *_unused, bitset_t *bs) {\n");
 648                 push(@obst_limit_func, @obst_init);
 649                 push(@obst_limit_func, @obst_ignore);
 650                 push(@obst_limit_func, @obst_limits);
 651                 push(@obst_limit_func, "}\n\n");
 652         }
 653
 654         return ($class, $has_limit, $same_pos, $different_pos);
 655 }
 656
 657 ###
 658 # Gets the variable name for the execution unit assigned to this register.
 659 ###
 660 sub get_execunit_variable_name {
 661         my $unit    = shift;
 662         my $name    = "NULL";
 663         my $uc_arch = uc($arch);
 664
 665         if ($unit) {
 666                 my $found = 0;
 667 SRCH:   foreach my $cur_type (keys(%cpu)) {
 668                         foreach my $cur_unit (@{ $cpu{"$cur_type"} }) {
 669                                 if ($unit eq $cur_unit) {
 670                                         my $tp_name   = "$arch\_execution_units_$cur_type";
 671                                         my $unit_name = "$uc_arch\_EXECUNIT_TP_$cur_type\_$unit";
 672                                         $name  = "&".$tp_name."[".$unit_name."]";
 673                                         $found = 1;
 674                                         last SRCH;
 675                                 }
 676                         }
 677                 }
 678
 679                 if (! $found) {
 680                         print STDERR "Invalid execution unit $unit specified!\n";
 681                 }
 682         }
 683
 684         return $name;
 685 }