gcc/optabs-libfuncs.cc

   1 /* Mapping from optabs to underlying library functions
   2    Copyright (C) 1987-2022 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14 for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GCC; see the file COPYING3.  If not see
  18 <http://www.gnu.org/licenses/>.  */
  19
  20
  21 #include "config.h"
  22 #include "system.h"
  23 #include "coretypes.h"
  24 #include "target.h"
  25 #include "insn-codes.h"
  26 #include "optabs-libfuncs.h"
  27 #include "libfuncs.h"
  28 #include "optabs-query.h"
  29 #include "tree.h"
  30 #include "stringpool.h"
  31 #include "varasm.h"
  32 #include "stor-layout.h"
  33 #include "rtl.h"
  34
  35 struct target_libfuncs default_target_libfuncs;
  36 #if SWITCHABLE_TARGET
  37 struct target_libfuncs *this_target_libfuncs = &default_target_libfuncs;
  38 #endif
  39
  40 #define libfunc_hash \
  41   (this_target_libfuncs->x_libfunc_hash)
  42
  43 /* Prefixes for the current version of decimal floating point (BID vs. DPD) */
  44 #if ENABLE_DECIMAL_BID_FORMAT
  45 #define DECIMAL_PREFIX "bid_"
  46 #else
  47 #define DECIMAL_PREFIX "dpd_"
  48 #endif
  49
  50 /* Used for libfunc_hash.  */
  51
  52 hashval_t
  53 libfunc_hasher::hash (libfunc_entry *e)
  54 {
  55   return ((e->mode1 + e->mode2 * NUM_MACHINE_MODES) ^ e->op);
  56 }
  57
  58 /* Used for libfunc_hash.  */
  59
  60 bool
  61 libfunc_hasher::equal (libfunc_entry *e1, libfunc_entry *e2)
  62 {
  63   return e1->op == e2->op && e1->mode1 == e2->mode1 && e1->mode2 == e2->mode2;
  64 }
  65
  66 /* Return libfunc corresponding operation defined by OPTAB converting
  67    from MODE2 to MODE1.  Trigger lazy initialization if needed, return NULL
  68    if no libfunc is available.  */
  69 rtx
  70 convert_optab_libfunc (convert_optab optab, machine_mode mode1,
  71                        machine_mode mode2)
  72 {
  73   struct libfunc_entry e;
  74   struct libfunc_entry **slot;
  75
  76   /* ??? This ought to be an assert, but not all of the places
  77      that we expand optabs know about the optabs that got moved
  78      to being direct.  */
  79   if (!(optab >= FIRST_CONV_OPTAB && optab <= LAST_CONVLIB_OPTAB))
  80     return NULL_RTX;
  81
  82   e.op = optab;
  83   e.mode1 = mode1;
  84   e.mode2 = mode2;
  85   slot = libfunc_hash->find_slot (&e, NO_INSERT);
  86   if (!slot)
  87     {
  88       const struct convert_optab_libcall_d *d
  89         = &convlib_def[optab - FIRST_CONV_OPTAB];
  90
  91       if (d->libcall_gen == NULL)
  92         return NULL;
  93
  94       d->libcall_gen (optab, d->libcall_basename, mode1, mode2);
  95       slot = libfunc_hash->find_slot (&e, NO_INSERT);
  96       if (!slot)
  97         return NULL;
  98     }
  99   return (*slot)->libfunc;
 100 }
 101
 102 /* Return libfunc corresponding operation defined by OPTAB in MODE.
 103    Trigger lazy initialization if needed, return NULL if no libfunc is
 104    available.  */
 105 rtx
 106 optab_libfunc (optab optab, machine_mode mode)
 107 {
 108   struct libfunc_entry e;
 109   struct libfunc_entry **slot;
 110
 111   /* ??? This ought to be an assert, but not all of the places
 112      that we expand optabs know about the optabs that got moved
 113      to being direct.  */
 114   if (!(optab >= FIRST_NORM_OPTAB && optab <= LAST_NORMLIB_OPTAB))
 115     return NULL_RTX;
 116
 117   e.op = optab;
 118   e.mode1 = mode;
 119   e.mode2 = VOIDmode;
 120   slot = libfunc_hash->find_slot (&e, NO_INSERT);
 121   if (!slot)
 122     {
 123       const struct optab_libcall_d *d
 124         = &normlib_def[optab - FIRST_NORM_OPTAB];
 125
 126       if (d->libcall_gen == NULL)
 127         return NULL;
 128
 129       d->libcall_gen (optab, d->libcall_basename, d->libcall_suffix, mode);
 130       slot = libfunc_hash->find_slot (&e, NO_INSERT);
 131       if (!slot)
 132         return NULL;
 133     }
 134   return (*slot)->libfunc;
 135 }
 136
 137 /* Initialize the libfunc fields of an entire group of entries in some
 138    optab.  Each entry is set equal to a string consisting of a leading
 139    pair of underscores followed by a generic operation name followed by
 140    a mode name (downshifted to lowercase) followed by a single character
 141    representing the number of operands for the given operation (which is
 142    usually one of the characters '2', '3', or '4').
 143
 144    OPTABLE is the table in which libfunc fields are to be initialized.
 145    OPNAME is the generic (string) name of the operation.
 146    SUFFIX is the character which specifies the number of operands for
 147      the given generic operation.
 148    MODE is the mode to generate for.  */
 149
 150 static void
 151 gen_libfunc (optab optable, const char *opname, int suffix,
 152              machine_mode mode)
 153 {
 154   unsigned opname_len = strlen (opname);
 155   const char *mname = GET_MODE_NAME (mode);
 156   unsigned mname_len = strlen (mname);
 157   int prefix_len = targetm.libfunc_gnu_prefix ? 6 : 2;
 158   int len = prefix_len + opname_len + mname_len + 1 + 1;
 159   char *libfunc_name = XALLOCAVEC (char, len);
 160   char *p;
 161   const char *q;
 162
 163   p = libfunc_name;
 164   *p++ = '_';
 165   *p++ = '_';
 166   if (targetm.libfunc_gnu_prefix)
 167     {
 168       *p++ = 'g';
 169       *p++ = 'n';
 170       *p++ = 'u';
 171       *p++ = '_';
 172     }
 173   for (q = opname; *q;)
 174     *p++ = *q++;
 175   for (q = mname; *q; q++)
 176     *p++ = TOLOWER (*q);
 177   *p++ = suffix;
 178   *p = '\0';
 179
 180   set_optab_libfunc (optable, mode,
 181                      ggc_alloc_string (libfunc_name, p - libfunc_name));
 182 }
 183
 184 /* Like gen_libfunc, but verify that integer operation is involved.  */
 185
 186 void
 187 gen_int_libfunc (optab optable, const char *opname, char suffix,
 188                  machine_mode mode)
 189 {
 190   int maxsize = 2 * BITS_PER_WORD;
 191   int minsize = BITS_PER_WORD;
 192   scalar_int_mode int_mode;
 193
 194   if (!is_int_mode (mode, &int_mode))
 195     return;
 196   if (maxsize < LONG_LONG_TYPE_SIZE)
 197     maxsize = LONG_LONG_TYPE_SIZE;
 198   if (minsize > INT_TYPE_SIZE
 199       && (trapv_binoptab_p (optable)
 200           || trapv_unoptab_p (optable)))
 201     minsize = INT_TYPE_SIZE;
 202   if (GET_MODE_BITSIZE (int_mode) < minsize
 203       || GET_MODE_BITSIZE (int_mode) > maxsize)
 204     return;
 205   gen_libfunc (optable, opname, suffix, int_mode);
 206 }
 207
 208 /* Like gen_libfunc, but verify that FP and set decimal prefix if needed.  */
 209
 210 void
 211 gen_fp_libfunc (optab optable, const char *opname, char suffix,
 212                 machine_mode mode)
 213 {
 214   char *dec_opname;
 215
 216   if (GET_MODE_CLASS (mode) == MODE_FLOAT)
 217     gen_libfunc (optable, opname, suffix, mode);
 218   if (DECIMAL_FLOAT_MODE_P (mode))
 219     {
 220       dec_opname = XALLOCAVEC (char, sizeof (DECIMAL_PREFIX) + strlen (opname));
 221       /* For BID support, change the name to have either a bid_ or dpd_ prefix
 222          depending on the low level floating format used.  */
 223       memcpy (dec_opname, DECIMAL_PREFIX, sizeof (DECIMAL_PREFIX) - 1);
 224       strcpy (dec_opname + sizeof (DECIMAL_PREFIX) - 1, opname);
 225       gen_libfunc (optable, dec_opname, suffix, mode);
 226     }
 227 }
 228
 229 /* Like gen_libfunc, but verify that fixed-point operation is involved.  */
 230
 231 void
 232 gen_fixed_libfunc (optab optable, const char *opname, char suffix,
 233                    machine_mode mode)
 234 {
 235   if (!ALL_FIXED_POINT_MODE_P (mode))
 236     return;
 237   gen_libfunc (optable, opname, suffix, mode);
 238 }
 239
 240 /* Like gen_libfunc, but verify that signed fixed-point operation is
 241    involved.  */
 242
 243 void
 244 gen_signed_fixed_libfunc (optab optable, const char *opname, char suffix,
 245                           machine_mode mode)
 246 {
 247   if (!SIGNED_FIXED_POINT_MODE_P (mode))
 248     return;
 249   gen_libfunc (optable, opname, suffix, mode);
 250 }
 251
 252 /* Like gen_libfunc, but verify that unsigned fixed-point operation is
 253    involved.  */
 254
 255 void
 256 gen_unsigned_fixed_libfunc (optab optable, const char *opname, char suffix,
 257                             machine_mode mode)
 258 {
 259   if (!UNSIGNED_FIXED_POINT_MODE_P (mode))
 260     return;
 261   gen_libfunc (optable, opname, suffix, mode);
 262 }
 263
 264 /* Like gen_libfunc, but verify that FP or INT operation is involved.  */
 265
 266 void
 267 gen_int_fp_libfunc (optab optable, const char *name, char suffix,
 268                     machine_mode mode)
 269 {
 270   if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
 271     gen_fp_libfunc (optable, name, suffix, mode);
 272   if (INTEGRAL_MODE_P (mode))
 273     gen_int_libfunc (optable, name, suffix, mode);
 274 }
 275
 276 /* Like gen_libfunc, but verify that FP or INT operation is involved
 277    and add 'v' suffix for integer operation.  */
 278
 279 void
 280 gen_intv_fp_libfunc (optab optable, const char *name, char suffix,
 281                      machine_mode mode)
 282 {
 283   if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
 284     gen_fp_libfunc (optable, name, suffix, mode);
 285   if (GET_MODE_CLASS (mode) == MODE_INT)
 286     {
 287       int len = strlen (name);
 288       char *v_name = XALLOCAVEC (char, len + 2);
 289       strcpy (v_name, name);
 290       v_name[len] = 'v';
 291       v_name[len + 1] = 0;
 292       gen_int_libfunc (optable, v_name, suffix, mode);
 293     }
 294 }
 295
 296 /* Like gen_libfunc, but verify that FP or INT or FIXED operation is
 297    involved.  */
 298
 299 void
 300 gen_int_fp_fixed_libfunc (optab optable, const char *name, char suffix,
 301                           machine_mode mode)
 302 {
 303   if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
 304     gen_fp_libfunc (optable, name, suffix, mode);
 305   if (INTEGRAL_MODE_P (mode))
 306     gen_int_libfunc (optable, name, suffix, mode);
 307   if (ALL_FIXED_POINT_MODE_P (mode))
 308     gen_fixed_libfunc (optable, name, suffix, mode);
 309 }
 310
 311 /* Like gen_libfunc, but verify that FP or INT or signed FIXED operation is
 312    involved.  */
 313
 314 void
 315 gen_int_fp_signed_fixed_libfunc (optab optable, const char *name, char suffix,
 316                                  machine_mode mode)
 317 {
 318   if (DECIMAL_FLOAT_MODE_P (mode) || GET_MODE_CLASS (mode) == MODE_FLOAT)
 319     gen_fp_libfunc (optable, name, suffix, mode);
 320   if (INTEGRAL_MODE_P (mode))
 321     gen_int_libfunc (optable, name, suffix, mode);
 322   if (SIGNED_FIXED_POINT_MODE_P (mode))
 323     gen_signed_fixed_libfunc (optable, name, suffix, mode);
 324 }
 325
 326 /* Like gen_libfunc, but verify that INT or FIXED operation is
 327    involved.  */
 328
 329 void
 330 gen_int_fixed_libfunc (optab optable, const char *name, char suffix,
 331                        machine_mode mode)
 332 {
 333   if (INTEGRAL_MODE_P (mode))
 334     gen_int_libfunc (optable, name, suffix, mode);
 335   if (ALL_FIXED_POINT_MODE_P (mode))
 336     gen_fixed_libfunc (optable, name, suffix, mode);
 337 }
 338
 339 /* Like gen_libfunc, but verify that INT or signed FIXED operation is
 340    involved.  */
 341
 342 void
 343 gen_int_signed_fixed_libfunc (optab optable, const char *name, char suffix,
 344                               machine_mode mode)
 345 {
 346   if (INTEGRAL_MODE_P (mode))
 347     gen_int_libfunc (optable, name, suffix, mode);
 348   if (SIGNED_FIXED_POINT_MODE_P (mode))
 349     gen_signed_fixed_libfunc (optable, name, suffix, mode);
 350 }
 351
 352 /* Like gen_libfunc, but verify that INT or unsigned FIXED operation is
 353    involved.  */
 354
 355 void
 356 gen_int_unsigned_fixed_libfunc (optab optable, const char *name, char suffix,
 357                                 machine_mode mode)
 358 {
 359   if (INTEGRAL_MODE_P (mode))
 360     gen_int_libfunc (optable, name, suffix, mode);
 361   if (UNSIGNED_FIXED_POINT_MODE_P (mode))
 362     gen_unsigned_fixed_libfunc (optable, name, suffix, mode);
 363 }
 364
 365 /* Initialize the libfunc fields of an entire group of entries of an
 366    inter-mode-class conversion optab.  The string formation rules are
 367    similar to the ones for init_libfuncs, above, but instead of having
 368    a mode name and an operand count these functions have two mode names
 369    and no operand count.  */
 370
 371 void
 372 gen_interclass_conv_libfunc (convert_optab tab,
 373                              const char *opname,
 374                              machine_mode tmode,
 375                              machine_mode fmode)
 376 {
 377   size_t opname_len = strlen (opname);
 378   size_t mname_len = 0;
 379
 380   const char *fname, *tname;
 381   const char *q;
 382   int prefix_len = targetm.libfunc_gnu_prefix ? 6 : 2;
 383   char *libfunc_name, *suffix;
 384   char *nondec_name, *dec_name, *nondec_suffix, *dec_suffix;
 385   char *p;
 386
 387   /* If this is a decimal conversion, add the current BID vs. DPD prefix that
 388      depends on which underlying decimal floating point format is used.  */
 389   const size_t dec_len = sizeof (DECIMAL_PREFIX) - 1;
 390
 391   mname_len = strlen (GET_MODE_NAME (tmode)) + strlen (GET_MODE_NAME (fmode));
 392
 393   nondec_name = XALLOCAVEC (char, prefix_len + opname_len + mname_len + 1 + 1);
 394   nondec_name[0] = '_';
 395   nondec_name[1] = '_';
 396   if (targetm.libfunc_gnu_prefix)
 397     {
 398       nondec_name[2] = 'g';
 399       nondec_name[3] = 'n';
 400       nondec_name[4] = 'u';
 401       nondec_name[5] = '_';
 402     }
 403
 404   memcpy (&nondec_name[prefix_len], opname, opname_len);
 405   nondec_suffix = nondec_name + opname_len + prefix_len;
 406
 407   dec_name = XALLOCAVEC (char, 2 + dec_len + opname_len + mname_len + 1 + 1);
 408   dec_name[0] = '_';
 409   dec_name[1] = '_';
 410   memcpy (&dec_name[2], DECIMAL_PREFIX, dec_len);
 411   memcpy (&dec_name[2+dec_len], opname, opname_len);
 412   dec_suffix = dec_name + dec_len + opname_len + 2;
 413
 414   fname = GET_MODE_NAME (fmode);
 415   tname = GET_MODE_NAME (tmode);
 416
 417   if (DECIMAL_FLOAT_MODE_P (fmode) || DECIMAL_FLOAT_MODE_P (tmode))
 418     {
 419       libfunc_name = dec_name;
 420       suffix = dec_suffix;
 421     }
 422   else
 423     {
 424       libfunc_name = nondec_name;
 425       suffix = nondec_suffix;
 426     }
 427
 428   p = suffix;
 429   for (q = fname; *q; p++, q++)
 430     *p = TOLOWER (*q);
 431   for (q = tname; *q; p++, q++)
 432     *p = TOLOWER (*q);
 433
 434   *p = '\0';
 435
 436   set_conv_libfunc (tab, tmode, fmode,
 437                     ggc_alloc_string (libfunc_name, p - libfunc_name));
 438 }
 439
 440 /* Same as gen_interclass_conv_libfunc but verify that we are producing
 441    int->fp conversion.  */
 442
 443 void
 444 gen_int_to_fp_conv_libfunc (convert_optab tab,
 445                             const char *opname,
 446                             machine_mode tmode,
 447                             machine_mode fmode)
 448 {
 449   if (GET_MODE_CLASS (fmode) != MODE_INT)
 450     return;
 451   if (GET_MODE_CLASS (tmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (tmode))
 452     return;
 453   gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
 454 }
 455
 456 /* ufloat_optab is special by using floatun for FP and floatuns decimal fp
 457    naming scheme.  */
 458
 459 void
 460 gen_ufloat_conv_libfunc (convert_optab tab,
 461                          const char *opname ATTRIBUTE_UNUSED,
 462                          machine_mode tmode,
 463                          machine_mode fmode)
 464 {
 465   if (DECIMAL_FLOAT_MODE_P (tmode))
 466     gen_int_to_fp_conv_libfunc (tab, "floatuns", tmode, fmode);
 467   else
 468     gen_int_to_fp_conv_libfunc (tab, "floatun", tmode, fmode);
 469 }
 470
 471 /* Same as gen_interclass_conv_libfunc but verify that we are producing
 472    fp->int conversion.  */
 473
 474 void
 475 gen_int_to_fp_nondecimal_conv_libfunc (convert_optab tab,
 476                                        const char *opname,
 477                                        machine_mode tmode,
 478                                        machine_mode fmode)
 479 {
 480   if (GET_MODE_CLASS (fmode) != MODE_INT)
 481     return;
 482   if (GET_MODE_CLASS (tmode) != MODE_FLOAT)
 483     return;
 484   gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
 485 }
 486
 487 /* Same as gen_interclass_conv_libfunc but verify that we are producing
 488    fp->int conversion with no decimal floating point involved.  */
 489
 490 void
 491 gen_fp_to_int_conv_libfunc (convert_optab tab,
 492                             const char *opname,
 493                             machine_mode tmode,
 494                             machine_mode fmode)
 495 {
 496   if (GET_MODE_CLASS (fmode) != MODE_FLOAT && !DECIMAL_FLOAT_MODE_P (fmode))
 497     return;
 498   if (GET_MODE_CLASS (tmode) != MODE_INT)
 499     return;
 500   gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
 501 }
 502
 503 /* Initialize the libfunc fields of an of an intra-mode-class conversion optab.
 504    The string formation rules are
 505    similar to the ones for init_libfunc, above.  */
 506
 507 void
 508 gen_intraclass_conv_libfunc (convert_optab tab, const char *opname,
 509                              machine_mode tmode, machine_mode fmode)
 510 {
 511   size_t opname_len = strlen (opname);
 512   size_t mname_len = 0;
 513
 514   const char *fname, *tname;
 515   const char *q;
 516   int prefix_len = targetm.libfunc_gnu_prefix ? 6 : 2;
 517   char *nondec_name, *dec_name, *nondec_suffix, *dec_suffix;
 518   char *libfunc_name, *suffix;
 519   char *p;
 520
 521   /* If this is a decimal conversion, add the current BID vs. DPD prefix that
 522      depends on which underlying decimal floating point format is used.  */
 523   const size_t dec_len = sizeof (DECIMAL_PREFIX) - 1;
 524
 525   mname_len = strlen (GET_MODE_NAME (tmode)) + strlen (GET_MODE_NAME (fmode));
 526
 527   nondec_name = XALLOCAVEC (char, 2 + opname_len + mname_len + 1 + 1);
 528   nondec_name[0] = '_';
 529   nondec_name[1] = '_';
 530   if (targetm.libfunc_gnu_prefix)
 531     {
 532       nondec_name[2] = 'g';
 533       nondec_name[3] = 'n';
 534       nondec_name[4] = 'u';
 535       nondec_name[5] = '_';
 536     }
 537   memcpy (&nondec_name[prefix_len], opname, opname_len);
 538   nondec_suffix = nondec_name + opname_len + prefix_len;
 539
 540   dec_name = XALLOCAVEC (char, 2 + dec_len + opname_len + mname_len + 1 + 1);
 541   dec_name[0] = '_';
 542   dec_name[1] = '_';
 543   memcpy (&dec_name[2], DECIMAL_PREFIX, dec_len);
 544   memcpy (&dec_name[2 + dec_len], opname, opname_len);
 545   dec_suffix = dec_name + dec_len + opname_len + 2;
 546
 547   fname = GET_MODE_NAME (fmode);
 548   tname = GET_MODE_NAME (tmode);
 549
 550   if (DECIMAL_FLOAT_MODE_P (fmode) || DECIMAL_FLOAT_MODE_P (tmode))
 551     {
 552       libfunc_name = dec_name;
 553       suffix = dec_suffix;
 554     }
 555   else
 556     {
 557       libfunc_name = nondec_name;
 558       suffix = nondec_suffix;
 559     }
 560
 561   p = suffix;
 562   for (q = fname; *q; p++, q++)
 563     *p = TOLOWER (*q);
 564   for (q = tname; *q; p++, q++)
 565     *p = TOLOWER (*q);
 566
 567   *p++ = '2';
 568   *p = '\0';
 569
 570   set_conv_libfunc (tab, tmode, fmode,
 571                     ggc_alloc_string (libfunc_name, p - libfunc_name));
 572 }
 573
 574 /* Pick proper libcall for trunc_optab.  We need to chose if we do
 575    truncation or extension and interclass or intraclass.  */
 576
 577 void
 578 gen_trunc_conv_libfunc (convert_optab tab,
 579                         const char *opname,
 580                         machine_mode tmode,
 581                         machine_mode fmode)
 582 {
 583   scalar_float_mode float_tmode, float_fmode;
 584   if (!is_a <scalar_float_mode> (fmode, &float_fmode)
 585       || !is_a <scalar_float_mode> (tmode, &float_tmode)
 586       || float_tmode == float_fmode)
 587     return;
 588
 589   if (GET_MODE_CLASS (float_tmode) != GET_MODE_CLASS (float_fmode))
 590     gen_interclass_conv_libfunc (tab, opname, float_tmode, float_fmode);
 591
 592   if (GET_MODE_PRECISION (float_fmode) <= GET_MODE_PRECISION (float_tmode))
 593     return;
 594
 595   if (GET_MODE_CLASS (float_tmode) == GET_MODE_CLASS (float_fmode))
 596     gen_intraclass_conv_libfunc (tab, opname, float_tmode, float_fmode);
 597 }
 598
 599 /* Pick proper libcall for extend_optab.  We need to chose if we do
 600    truncation or extension and interclass or intraclass.  */
 601
 602 void
 603 gen_extend_conv_libfunc (convert_optab tab,
 604                          const char *opname ATTRIBUTE_UNUSED,
 605                          machine_mode tmode,
 606                          machine_mode fmode)
 607 {
 608   scalar_float_mode float_tmode, float_fmode;
 609   if (!is_a <scalar_float_mode> (fmode, &float_fmode)
 610       || !is_a <scalar_float_mode> (tmode, &float_tmode)
 611       || float_tmode == float_fmode)
 612     return;
 613
 614   if (GET_MODE_CLASS (float_tmode) != GET_MODE_CLASS (float_fmode))
 615     gen_interclass_conv_libfunc (tab, opname, float_tmode, float_fmode);
 616
 617   if (GET_MODE_PRECISION (float_fmode) > GET_MODE_PRECISION (float_tmode))
 618     return;
 619
 620   if (GET_MODE_CLASS (float_tmode) == GET_MODE_CLASS (float_fmode))
 621     gen_intraclass_conv_libfunc (tab, opname, tmode, fmode);
 622 }
 623
 624 /* Pick proper libcall for fract_optab.  We need to chose if we do
 625    interclass or intraclass.  */
 626
 627 void
 628 gen_fract_conv_libfunc (convert_optab tab,
 629                         const char *opname,
 630                         machine_mode tmode,
 631                         machine_mode fmode)
 632 {
 633   if (tmode == fmode)
 634     return;
 635   if (!(ALL_FIXED_POINT_MODE_P (tmode) || ALL_FIXED_POINT_MODE_P (fmode)))
 636     return;
 637
 638   if (GET_MODE_CLASS (tmode) == GET_MODE_CLASS (fmode))
 639     gen_intraclass_conv_libfunc (tab, opname, tmode, fmode);
 640   else
 641     gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
 642 }
 643
 644 /* Pick proper libcall for fractuns_optab.  */
 645
 646 void
 647 gen_fractuns_conv_libfunc (convert_optab tab,
 648                            const char *opname,
 649                            machine_mode tmode,
 650                            machine_mode fmode)
 651 {
 652   if (tmode == fmode)
 653     return;
 654   /* One mode must be a fixed-point mode, and the other must be an integer
 655      mode.  */
 656   if (!((ALL_FIXED_POINT_MODE_P (tmode) && GET_MODE_CLASS (fmode) == MODE_INT)
 657         || (ALL_FIXED_POINT_MODE_P (fmode)
 658             && GET_MODE_CLASS (tmode) == MODE_INT)))
 659     return;
 660
 661   gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
 662 }
 663
 664 /* Pick proper libcall for satfract_optab.  We need to chose if we do
 665    interclass or intraclass.  */
 666
 667 void
 668 gen_satfract_conv_libfunc (convert_optab tab,
 669                            const char *opname,
 670                            machine_mode tmode,
 671                            machine_mode fmode)
 672 {
 673   if (tmode == fmode)
 674     return;
 675   /* TMODE must be a fixed-point mode.  */
 676   if (!ALL_FIXED_POINT_MODE_P (tmode))
 677     return;
 678
 679   if (GET_MODE_CLASS (tmode) == GET_MODE_CLASS (fmode))
 680     gen_intraclass_conv_libfunc (tab, opname, tmode, fmode);
 681   else
 682     gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
 683 }
 684
 685 /* Pick proper libcall for satfractuns_optab.  */
 686
 687 void
 688 gen_satfractuns_conv_libfunc (convert_optab tab,
 689                               const char *opname,
 690                               machine_mode tmode,
 691                               machine_mode fmode)
 692 {
 693   if (tmode == fmode)
 694     return;
 695   /* TMODE must be a fixed-point mode, and FMODE must be an integer mode.  */
 696   if (!(ALL_FIXED_POINT_MODE_P (tmode) && GET_MODE_CLASS (fmode) == MODE_INT))
 697     return;
 698
 699   gen_interclass_conv_libfunc (tab, opname, tmode, fmode);
 700 }
 701
 702 /* Hashtable callbacks for libfunc_decls.  */
 703
 704 struct libfunc_decl_hasher : ggc_ptr_hash<tree_node>
 705 {
 706   static hashval_t
 707   hash (tree entry)
 708   {
 709     return IDENTIFIER_HASH_VALUE (DECL_NAME (entry));
 710   }
 711
 712   static bool
 713   equal (tree decl, tree name)
 714   {
 715     return DECL_NAME (decl) == name;
 716   }
 717 };
 718
 719 /* A table of previously-created libfuncs, hashed by name.  */
 720 static GTY (()) hash_table<libfunc_decl_hasher> *libfunc_decls;
 721
 722 /* Build a decl for a libfunc named NAME with visibility VIS.  */
 723
 724 tree
 725 build_libfunc_function_visibility (const char *name, symbol_visibility vis)
 726 {
 727   /* ??? We don't have any type information; pretend this is "int foo ()".  */
 728   tree decl = build_decl (UNKNOWN_LOCATION, FUNCTION_DECL,
 729                           get_identifier (name),
 730                           build_function_type (integer_type_node, NULL_TREE));
 731   DECL_EXTERNAL (decl) = 1;
 732   TREE_PUBLIC (decl) = 1;
 733   DECL_ARTIFICIAL (decl) = 1;
 734   DECL_VISIBILITY (decl) = vis;
 735   DECL_VISIBILITY_SPECIFIED (decl) = 1;
 736   gcc_assert (DECL_ASSEMBLER_NAME (decl));
 737
 738   return decl;
 739 }
 740
 741 /* Build a decl for a libfunc named NAME.  */
 742
 743 tree
 744 build_libfunc_function (const char *name)
 745 {
 746   return build_libfunc_function_visibility (name, VISIBILITY_DEFAULT);
 747 }
 748
 749 /* Return a libfunc for NAME, creating one if we don't already have one.
 750    The decl is given visibility VIS.  The returned rtx is a SYMBOL_REF.  */
 751
 752 rtx
 753 init_one_libfunc_visibility (const char *name, symbol_visibility vis)
 754 {
 755   tree id, decl;
 756   hashval_t hash;
 757
 758   if (libfunc_decls == NULL)
 759     libfunc_decls = hash_table<libfunc_decl_hasher>::create_ggc (37);
 760
 761   /* See if we have already created a libfunc decl for this function.  */
 762   id = get_identifier (name);
 763   hash = IDENTIFIER_HASH_VALUE (id);
 764   tree *slot = libfunc_decls->find_slot_with_hash (id, hash, INSERT);
 765   decl = *slot;
 766   if (decl == NULL)
 767     {
 768       /* Create a new decl, so that it can be passed to
 769          targetm.encode_section_info.  */
 770       decl = build_libfunc_function_visibility (name, vis);
 771       *slot = decl;
 772     }
 773   return XEXP (DECL_RTL (decl), 0);
 774 }
 775
 776 rtx
 777 init_one_libfunc (const char *name)
 778 {
 779   return init_one_libfunc_visibility (name, VISIBILITY_DEFAULT);
 780 }
 781
 782 /* Adjust the assembler name of libfunc NAME to ASMSPEC.  */
 783
 784 rtx
 785 set_user_assembler_libfunc (const char *name, const char *asmspec)
 786 {
 787   tree id, decl;
 788   hashval_t hash;
 789
 790   id = get_identifier (name);
 791   hash = IDENTIFIER_HASH_VALUE (id);
 792   tree *slot = libfunc_decls->find_slot_with_hash (id, hash, NO_INSERT);
 793   gcc_assert (slot);
 794   decl = (tree) *slot;
 795   set_user_assembler_name (decl, asmspec);
 796   return XEXP (DECL_RTL (decl), 0);
 797 }
 798
 799 /* Call this to reset the function entry for one optab (OPTABLE) in mode
 800    MODE to NAME, which should be either 0 or a string constant.  */
 801
 802 void
 803 set_optab_libfunc (optab op, machine_mode mode, const char *name)
 804 {
 805   rtx val;
 806   struct libfunc_entry e;
 807   struct libfunc_entry **slot;
 808
 809   e.op = op;
 810   e.mode1 = mode;
 811   e.mode2 = VOIDmode;
 812
 813   if (name)
 814     val = init_one_libfunc (name);
 815   else
 816     val = 0;
 817   slot = libfunc_hash->find_slot (&e, INSERT);
 818   if (*slot == NULL)
 819     *slot = ggc_alloc<libfunc_entry> ();
 820   (*slot)->op = op;
 821   (*slot)->mode1 = mode;
 822   (*slot)->mode2 = VOIDmode;
 823   (*slot)->libfunc = val;
 824 }
 825
 826 /* Call this to reset the function entry for one conversion optab
 827    (OPTABLE) from mode FMODE to mode TMODE to NAME, which should be
 828    either 0 or a string constant.  */
 829
 830 void
 831 set_conv_libfunc (convert_optab optab, machine_mode tmode,
 832                   machine_mode fmode, const char *name)
 833 {
 834   rtx val;
 835   struct libfunc_entry e;
 836   struct libfunc_entry **slot;
 837
 838   e.op = optab;
 839   e.mode1 = tmode;
 840   e.mode2 = fmode;
 841
 842   if (name)
 843     val = init_one_libfunc (name);
 844   else
 845     val = 0;
 846   slot = libfunc_hash->find_slot (&e, INSERT);
 847   if (*slot == NULL)
 848     *slot = ggc_alloc<libfunc_entry> ();
 849   (*slot)->op = optab;
 850   (*slot)->mode1 = tmode;
 851   (*slot)->mode2 = fmode;
 852   (*slot)->libfunc = val;
 853 }
 854
 855 /* Call this to initialize the contents of the optabs
 856    appropriately for the current target machine.  */
 857
 858 void
 859 init_optabs (void)
 860 {
 861   if (libfunc_hash)
 862     libfunc_hash->empty ();
 863   else
 864     libfunc_hash = hash_table<libfunc_hasher>::create_ggc (10);
 865
 866   /* Fill in the optabs with the insns we support.  */
 867   init_all_optabs (this_fn_optabs);
 868
 869   /* The ffs function operates on `int'.  Fall back on it if we do not
 870      have a libgcc2 function for that width.  */
 871   if (INT_TYPE_SIZE < BITS_PER_WORD)
 872     {
 873       scalar_int_mode mode = int_mode_for_size (INT_TYPE_SIZE, 0).require ();
 874       set_optab_libfunc (ffs_optab, mode, "ffs");
 875     }
 876
 877   /* Explicitly initialize the bswap libfuncs since we need them to be
 878      valid for things other than word_mode.  */
 879   if (targetm.libfunc_gnu_prefix)
 880     {
 881       set_optab_libfunc (bswap_optab, SImode, "__gnu_bswapsi2");
 882       set_optab_libfunc (bswap_optab, DImode, "__gnu_bswapdi2");
 883     }
 884   else
 885     {
 886       set_optab_libfunc (bswap_optab, SImode, "__bswapsi2");
 887       set_optab_libfunc (bswap_optab, DImode, "__bswapdi2");
 888     }
 889
 890   /* Use cabs for double complex abs, since systems generally have cabs.
 891      Don't define any libcall for float complex, so that cabs will be used.  */
 892   if (complex_double_type_node)
 893     set_optab_libfunc (abs_optab, TYPE_MODE (complex_double_type_node),
 894                        "cabs");
 895
 896   unwind_sjlj_register_libfunc = init_one_libfunc ("_Unwind_SjLj_Register");
 897   unwind_sjlj_unregister_libfunc
 898     = init_one_libfunc ("_Unwind_SjLj_Unregister");
 899
 900   /* Allow the target to add more libcalls or rename some, etc.  */
 901   targetm.init_libfuncs ();
 902 }
 903
 904 /* A helper function for init_sync_libfuncs.  Using the basename BASE,
 905    install libfuncs into TAB for BASE_N for 1 <= N <= MAX.  */
 906
 907 static void
 908 init_sync_libfuncs_1 (optab tab, const char *base, int max)
 909 {
 910   machine_mode mode;
 911   char buf[64];
 912   size_t len = strlen (base);
 913   int i;
 914
 915   gcc_assert (max <= 8);
 916   gcc_assert (len + 3 < sizeof (buf));
 917
 918   memcpy (buf, base, len);
 919   buf[len] = '_';
 920   buf[len + 1] = '0';
 921   buf[len + 2] = '\0';
 922
 923   mode = QImode;
 924   for (i = 1; i <= max; i *= 2)
 925     {
 926       if (i > 1)
 927         mode = GET_MODE_2XWIDER_MODE (mode).require ();
 928       buf[len + 1] = '0' + i;
 929       set_optab_libfunc (tab, mode, buf);
 930     }
 931 }
 932
 933 void
 934 init_sync_libfuncs (int max)
 935 {
 936   if (!flag_sync_libcalls)
 937     return;
 938
 939   init_sync_libfuncs_1 (sync_compare_and_swap_optab,
 940                         "__sync_val_compare_and_swap", max);
 941   init_sync_libfuncs_1 (sync_lock_test_and_set_optab,
 942                         "__sync_lock_test_and_set", max);
 943
 944   init_sync_libfuncs_1 (sync_old_add_optab, "__sync_fetch_and_add", max);
 945   init_sync_libfuncs_1 (sync_old_sub_optab, "__sync_fetch_and_sub", max);
 946   init_sync_libfuncs_1 (sync_old_ior_optab, "__sync_fetch_and_or", max);
 947   init_sync_libfuncs_1 (sync_old_and_optab, "__sync_fetch_and_and", max);
 948   init_sync_libfuncs_1 (sync_old_xor_optab, "__sync_fetch_and_xor", max);
 949   init_sync_libfuncs_1 (sync_old_nand_optab, "__sync_fetch_and_nand", max);
 950
 951   init_sync_libfuncs_1 (sync_new_add_optab, "__sync_add_and_fetch", max);
 952   init_sync_libfuncs_1 (sync_new_sub_optab, "__sync_sub_and_fetch", max);
 953   init_sync_libfuncs_1 (sync_new_ior_optab, "__sync_or_and_fetch", max);
 954   init_sync_libfuncs_1 (sync_new_and_optab, "__sync_and_and_fetch", max);
 955   init_sync_libfuncs_1 (sync_new_xor_optab, "__sync_xor_and_fetch", max);
 956   init_sync_libfuncs_1 (sync_new_nand_optab, "__sync_nand_and_fetch", max);
 957 }
 958
 959 #include "gt-optabs-libfuncs.h"