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

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