libgcc/libgcc2.h

   1 /* Header file for libgcc2.c.  */
   2 /* Copyright (C) 2000-2023 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 Under Section 7 of GPL version 3, you are granted additional
  17 permissions described in the GCC Runtime Library Exception, version
  18 3.1, as published by the Free Software Foundation.
  19
  20 You should have received a copy of the GNU General Public License and
  21 a copy of the GCC Runtime Library Exception along with this program;
  22 see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  23 <http://www.gnu.org/licenses/>.  */
  24
  25 #ifndef GCC_LIBGCC2_H
  26 #define GCC_LIBGCC2_H
  27
  28 #ifndef HIDE_EXPORTS
  29 #pragma GCC visibility push(default)
  30 #endif
  31
  32 extern int __gcc_bcmp (const unsigned char *, const unsigned char *, size_t);
  33 extern void __clear_cache (void *, void *);
  34 extern void __eprintf (const char *, const char *, unsigned int, const char *)
  35   __attribute__ ((__noreturn__));
  36
  37 #ifdef __LIBGCC_HAS_HF_MODE__
  38 #define LIBGCC2_HAS_HF_MODE 1
  39 #else
  40 #define LIBGCC2_HAS_HF_MODE 0
  41 #endif
  42
  43 #ifdef __LIBGCC_HAS_SF_MODE__
  44 #define LIBGCC2_HAS_SF_MODE 1
  45 #else
  46 #define LIBGCC2_HAS_SF_MODE 0
  47 #endif
  48
  49 #ifdef __LIBGCC_HAS_DF_MODE__
  50 #define LIBGCC2_HAS_DF_MODE 1
  51 #else
  52 #define LIBGCC2_HAS_DF_MODE 0
  53 #endif
  54
  55 #ifdef __LIBGCC_HAS_XF_MODE__
  56 #define LIBGCC2_HAS_XF_MODE 1
  57 #else
  58 #define LIBGCC2_HAS_XF_MODE 0
  59 #endif
  60
  61 #ifdef __LIBGCC_HAS_TF_MODE__
  62 #define LIBGCC2_HAS_TF_MODE 1
  63 #else
  64 #define LIBGCC2_HAS_TF_MODE 0
  65 #endif
  66
  67 #ifndef __LIBGCC_SF_MANT_DIG__
  68 #if LIBGCC2_HAS_SF_MODE
  69 #error __LIBGCC_SF_MANT_DIG__ not defined
  70 #else
  71 #define __LIBGCC_SF_MANT_DIG__ 0
  72 #endif
  73 #endif
  74
  75 #ifndef __LIBGCC_DF_MANT_DIG__
  76 #if LIBGCC2_HAS_DF_MODE
  77 #error __LIBGCC_DF_MANT_DIG__ not defined
  78 #else
  79 #define __LIBGCC_DF_MANT_DIG__ 0
  80 #endif
  81 #endif
  82
  83 #ifndef __LIBGCC_XF_MANT_DIG__
  84 #if LIBGCC2_HAS_XF_MODE
  85 #error __LIBGCC_XF_MANT_DIG__ not defined
  86 #else
  87 #define __LIBGCC_XF_MANT_DIG__ 0
  88 #endif
  89 #endif
  90
  91 #ifndef __LIBGCC_TF_MANT_DIG__
  92 #if LIBGCC2_HAS_TF_MODE
  93 #error __LIBGCC_TF_MANT_DIG__ not defined
  94 #else
  95 #define __LIBGCC_TF_MANT_DIG__ 0
  96 #endif
  97 #endif
  98
  99 /* FIXME: This #ifdef probably should be removed, ie. enable the test
 100    for mips too.  */
 101 /* Don't use IBM Extended Double TFmode for TI->SF calculations.
 102    The conversion from long double to float suffers from double
 103    rounding, because we convert via double.  In other cases, going
 104    through the software fp routines is much slower than the fallback.  */
 105 #ifdef __powerpc__
 106 #define AVOID_FP_TYPE_CONVERSION(SIZE) (SIZE == 106)
 107 #elif defined(WIDEST_HARDWARE_FP_SIZE)
 108 #define AVOID_FP_TYPE_CONVERSION(SIZE) (SIZE > WIDEST_HARDWARE_FP_SIZE)
 109 #else
 110 #define AVOID_FP_TYPE_CONVERSION(SIZE) 0
 111 #endif
 112
 113 /* In the first part of this file, we are interfacing to calls generated
 114    by the compiler itself.  These calls pass values into these routines
 115    which have very specific modes (rather than very specific types), and
 116    these compiler-generated calls also expect any return values to have
 117    very specific modes (rather than very specific types).  Thus, we need
 118    to avoid using regular C language type names in this part of the file
 119    because the sizes for those types can be configured to be anything.
 120    Instead we use the following special type names.  */
 121
 122 typedef          int QItype     __attribute__ ((mode (QI)));
 123 typedef unsigned int UQItype    __attribute__ ((mode (QI)));
 124 typedef          int HItype     __attribute__ ((mode (HI)));
 125 typedef unsigned int UHItype    __attribute__ ((mode (HI)));
 126 #if MIN_UNITS_PER_WORD > 1
 127 /* These typedefs are usually forbidden on dsp's with UNITS_PER_WORD 1.  */
 128 typedef          int SItype     __attribute__ ((mode (SI)));
 129 typedef unsigned int USItype    __attribute__ ((mode (SI)));
 130 #if __SIZEOF_LONG_LONG__ > 4
 131 /* These typedefs are usually forbidden on archs with UNITS_PER_WORD 2.  */
 132 typedef          int DItype     __attribute__ ((mode (DI)));
 133 typedef unsigned int UDItype    __attribute__ ((mode (DI)));
 134 #if MIN_UNITS_PER_WORD > 4
 135 /* These typedefs are usually forbidden on archs with UNITS_PER_WORD 4.  */
 136 typedef          int TItype     __attribute__ ((mode (TI)));
 137 typedef unsigned int UTItype    __attribute__ ((mode (TI)));
 138 #endif
 139 #endif
 140 #endif
 141
 142 #if LIBGCC2_HAS_HF_MODE
 143 typedef         float HFtype    __attribute__ ((mode (HF)));
 144 typedef _Complex float HCtype   __attribute__ ((mode (HC)));
 145 #endif
 146 #if LIBGCC2_HAS_SF_MODE
 147 typedef         float SFtype    __attribute__ ((mode (SF)));
 148 typedef _Complex float SCtype   __attribute__ ((mode (SC)));
 149 #endif
 150 #if LIBGCC2_HAS_DF_MODE
 151 typedef         float DFtype    __attribute__ ((mode (DF)));
 152 typedef _Complex float DCtype   __attribute__ ((mode (DC)));
 153 #endif
 154 #if LIBGCC2_HAS_XF_MODE
 155 typedef         float XFtype    __attribute__ ((mode (XF)));
 156 typedef _Complex float XCtype   __attribute__ ((mode (XC)));
 157 #endif
 158 #if LIBGCC2_HAS_TF_MODE
 159 #ifndef TFtype
 160 typedef         float TFtype    __attribute__ ((mode (TF)));
 161 #endif
 162 #ifndef TCtype
 163 typedef _Complex float TCtype   __attribute__ ((mode (TC)));
 164 #endif
 165 #endif
 166
 167 typedef int cmp_return_type __attribute__((mode (__libgcc_cmp_return__)));
 168 typedef int shift_count_type __attribute__((mode (__libgcc_shift_count__)));
 169
 170 /* Make sure that we don't accidentally use any normal C language built-in
 171    type names in the first part of this file.  Instead we want to use *only*
 172    the type names defined above.  The following macro definitions insure
 173    that if we *do* accidentally use some normal C language built-in type name,
 174    we will get a syntax error.  */
 175
 176 #define char bogus_type
 177 #define short bogus_type
 178 #define int bogus_type
 179 #define long bogus_type
 180 #define unsigned bogus_type
 181 #define float bogus_type
 182 #define double bogus_type
 183
 184 #if (defined(__BITINT_MAXWIDTH__) \
 185      && (defined(L_mulbitint3) || defined(L_divmodbitint4)))
 186 #undef LIBGCC2_UNITS_PER_WORD
 187 #define LIBGCC2_UNITS_PER_WORD (__LIBGCC_BITINT_LIMB_WIDTH__ / __CHAR_BIT__)
 188 #endif
 189
 190 /* Versions prior to 3.4.4 were not taking into account the word size for
 191    the 5 trapping arithmetic functions absv, addv, subv, mulv and negv.  As
 192    a consequence, the si and di variants were always and the only ones emitted.
 193    To maintain backward compatibility, COMPAT_SIMODE_TRAPPING_ARITHMETIC is
 194    defined on platforms where it makes sense to still have the si variants
 195    emitted.  As a bonus, their implementation is now correct.  Note that the
 196    same mechanism should have been implemented for the di variants, but it
 197    turns out that no platform would define COMPAT_DIMODE_TRAPPING_ARITHMETIC
 198    if it existed.  */
 199
 200 #if LIBGCC2_UNITS_PER_WORD == 8
 201 #define W_TYPE_SIZE (8 * __CHAR_BIT__)
 202 #define Wtype   DItype
 203 #define UWtype  UDItype
 204 #define HWtype  DItype
 205 #define UHWtype UDItype
 206 #define DWtype  TItype
 207 #define UDWtype UTItype
 208 #ifdef LIBGCC2_GNU_PREFIX
 209 #define __NW(a,b)       __gnu_ ## a ## di ## b
 210 #define __NDW(a,b)      __gnu_ ## a ## ti ## b
 211 #else
 212 #define __NW(a,b)       __ ## a ## di ## b
 213 #define __NDW(a,b)      __ ## a ## ti ## b
 214 #endif
 215 #define COMPAT_SIMODE_TRAPPING_ARITHMETIC
 216 #elif LIBGCC2_UNITS_PER_WORD == 4
 217 #define W_TYPE_SIZE (4 * __CHAR_BIT__)
 218 #define Wtype   SItype
 219 #define UWtype  USItype
 220 #define HWtype  SItype
 221 #define UHWtype USItype
 222 #define DWtype  DItype
 223 #define UDWtype UDItype
 224 #ifdef LIBGCC2_GNU_PREFIX
 225 #define __NW(a,b)       __gnu_ ## a ## si ## b
 226 #define __NDW(a,b)      __gnu_ ## a ## di ## b
 227 #else
 228 #define __NW(a,b)       __ ## a ## si ## b
 229 #define __NDW(a,b)      __ ## a ## di ## b
 230 #endif
 231 #elif LIBGCC2_UNITS_PER_WORD == 2
 232 #define W_TYPE_SIZE (2 * __CHAR_BIT__)
 233 #define Wtype   HItype
 234 #define UWtype  UHItype
 235 #define HWtype  HItype
 236 #define UHWtype UHItype
 237 #define DWtype  SItype
 238 #define UDWtype USItype
 239 #ifdef LIBGCC2_GNU_PREFIX
 240 #define __NW(a,b)       __gnu_ ## a ## hi ## b
 241 #define __NDW(a,b)      __gnu_ ## a ## si ## b
 242 #else
 243 #define __NW(a,b)       __ ## a ## hi ## b
 244 #define __NDW(a,b)      __ ## a ## si ## b
 245 #endif
 246 #else
 247 #define W_TYPE_SIZE __CHAR_BIT__
 248 #define Wtype   QItype
 249 #define UWtype  UQItype
 250 #define HWtype  QItype
 251 #define UHWtype UQItype
 252 #define DWtype  HItype
 253 #define UDWtype UHItype
 254 #ifdef LIBGCC2_GNU_PREFIX
 255 #define __NW(a,b)       __gnu_ ## a ## qi ## b
 256 #define __NDW(a,b)      __gnu_ ## a ## hi ## b
 257 #else
 258 #define __NW(a,b)       __ ## a ## qi ## b
 259 #define __NDW(a,b)      __ ## a ## hi ## b
 260 #endif
 261 #endif
 262
 263 #ifdef LIBGCC2_GNU_PREFIX
 264 #define __N(a)  __gnu_ ## a
 265 #else
 266 #define __N(a)  __ ## a
 267 #endif
 268 #define Wtype_MAX ((Wtype)(((UWtype)1 << (W_TYPE_SIZE - 1)) - 1))
 269 #define Wtype_MIN (- Wtype_MAX - 1)
 270
 271 #if W_TYPE_SIZE == 8
 272 # define Wtype_MAXp1_F  0x1p8f
 273 #elif W_TYPE_SIZE == 16
 274 # define Wtype_MAXp1_F  0x1p16f
 275 #elif W_TYPE_SIZE == 32
 276 # define Wtype_MAXp1_F  0x1p32f
 277 #elif W_TYPE_SIZE == 64
 278 # define Wtype_MAXp1_F  0x1p64f
 279 #else
 280 # error "expand the table"
 281 #endif
 282
 283 #define __muldi3        __NDW(mul,3)
 284 #define __divdi3        __NDW(div,3)
 285 #define __udivdi3       __NDW(udiv,3)
 286 #define __moddi3        __NDW(mod,3)
 287 #define __umoddi3       __NDW(umod,3)
 288 #define __negdi2        __NDW(neg,2)
 289 #define __lshrdi3       __NDW(lshr,3)
 290 #define __ashldi3       __NDW(ashl,3)
 291 #define __ashrdi3       __NDW(ashr,3)
 292 #define __cmpdi2        __NDW(cmp,2)
 293 #define __ucmpdi2       __NDW(ucmp,2)
 294 #define __divmoddi4     __NDW(divmod,4)
 295 #define __udivmoddi4    __NDW(udivmod,4)
 296 #define __fixunstfDI    __NDW(fixunstf,)
 297 #define __fixtfdi       __NDW(fixtf,)
 298 #define __fixunsxfDI    __NDW(fixunsxf,)
 299 #define __fixxfdi       __NDW(fixxf,)
 300 #define __fixunsdfDI    __NDW(fixunsdf,)
 301 #define __fixdfdi       __NDW(fixdf,)
 302 #define __fixunssfDI    __NDW(fixunssf,)
 303 #define __fixsfdi       __NDW(fixsf,)
 304 #define __floatdixf     __NDW(float,xf)
 305 #define __floatditf     __NDW(float,tf)
 306 #define __floatdidf     __NDW(float,df)
 307 #define __floatdisf     __NDW(float,sf)
 308 #define __floatundixf   __NDW(floatun,xf)
 309 #define __floatunditf   __NDW(floatun,tf)
 310 #define __floatundidf   __NDW(floatun,df)
 311 #define __floatundisf   __NDW(floatun,sf)
 312 #define __fixunsxfSI    __NW(fixunsxf,)
 313 #define __fixunstfSI    __NW(fixunstf,)
 314 #define __fixunsdfSI    __NW(fixunsdf,)
 315 #define __fixunssfSI    __NW(fixunssf,)
 316
 317 #define __absvSI2       __NW(absv,2)
 318 #define __addvSI3       __NW(addv,3)
 319 #define __subvSI3       __NW(subv,3)
 320 #define __mulvSI3       __NW(mulv,3)
 321 #define __negvSI2       __NW(negv,2)
 322 #define __absvDI2       __NDW(absv,2)
 323 #define __addvDI3       __NDW(addv,3)
 324 #define __subvDI3       __NDW(subv,3)
 325 #define __mulvDI3       __NDW(mulv,3)
 326 #define __negvDI2       __NDW(negv,2)
 327
 328 #define __ffsSI2        __NW(ffs,2)
 329 #define __clzSI2        __NW(clz,2)
 330 #define __ctzSI2        __NW(ctz,2)
 331 #define __clrsbSI2      __NW(clrsb,2)
 332 #define __popcountSI2   __NW(popcount,2)
 333 #define __paritySI2     __NW(parity,2)
 334 #define __ffsDI2        __NDW(ffs,2)
 335 #define __clzDI2        __NDW(clz,2)
 336 #define __ctzDI2        __NDW(ctz,2)
 337 #define __clrsbDI2      __NDW(clrsb,2)
 338 #define __popcountDI2   __NDW(popcount,2)
 339 #define __parityDI2     __NDW(parity,2)
 340
 341 #define __clz_tab               __N(clz_tab)
 342 #define __bswapsi2              __N(bswapsi2)
 343 #define __bswapdi2              __N(bswapdi2)
 344 #define __udiv_w_sdiv           __N(udiv_w_sdiv)
 345 #define __clear_cache           __N(clear_cache)
 346 #define __enable_execute_stack  __N(enable_execute_stack)
 347
 348 #ifndef __powisf2
 349 #define __powisf2               __N(powisf2)
 350 #endif
 351 #ifndef __powidf2
 352 #define __powidf2               __N(powidf2)
 353 #endif
 354 #ifndef __powitf2
 355 #define __powitf2               __N(powitf2)
 356 #endif
 357 #ifndef __powixf2
 358 #define __powixf2               __N(powixf2)
 359 #endif
 360 #ifndef __mulsc3
 361 #define __mulsc3                __N(mulsc3)
 362 #endif
 363 #ifndef __muldc3
 364 #define __muldc3                __N(muldc3)
 365 #endif
 366 #ifndef __mulxc3
 367 #define __mulxc3                __N(mulxc3)
 368 #endif
 369 #ifndef __multc3
 370 #define __multc3                __N(multc3)
 371 #endif
 372 #ifndef __divsc3
 373 #define __divsc3                __N(divsc3)
 374 #endif
 375 #ifndef __divdc3
 376 #define __divdc3                __N(divdc3)
 377 #endif
 378 #ifndef __divxc3
 379 #define __divxc3                __N(divxc3)
 380 #endif
 381 #ifndef __divtc3
 382 #define __divtc3                __N(divtc3)
 383 #endif
 384
 385 extern DWtype __muldi3 (DWtype, DWtype);
 386 extern DWtype __divdi3 (DWtype, DWtype);
 387 extern UDWtype __udivdi3 (UDWtype, UDWtype);
 388 extern UDWtype __umoddi3 (UDWtype, UDWtype);
 389 extern DWtype __moddi3 (DWtype, DWtype);
 390 extern DWtype __divmoddi4 (DWtype, DWtype, DWtype *);
 391
 392 /* __udivmoddi4 is static inline when building other libgcc2 portions.  */
 393 #if (!defined (L_udivdi3) && !defined (L_divdi3) && \
 394      !defined (L_umoddi3) && !defined (L_moddi3) && \
 395      !defined (L_divmoddi4))
 396 extern UDWtype __udivmoddi4 (UDWtype, UDWtype, UDWtype *);
 397 #endif
 398
 399 #if (defined(__BITINT_MAXWIDTH__) \
 400      && (defined(L_mulbitint3) || defined(L_divmodbitint4)))
 401 /* _BitInt support.  */
 402 extern void __mulbitint3 (UWtype *, SItype, const UWtype *, SItype,
 403                           const UWtype *, SItype);
 404 extern void __divmodbitint4 (UWtype *, SItype, UWtype *, SItype,
 405                              const UWtype *, SItype, const UWtype *, SItype);
 406 #endif
 407
 408 /* __negdi2 is static inline when building other libgcc2 portions.  */
 409 #if !defined(L_divdi3) && !defined(L_moddi3)
 410 extern DWtype __negdi2 (DWtype);
 411 #endif
 412
 413 extern DWtype __lshrdi3 (DWtype, shift_count_type);
 414 extern DWtype __ashldi3 (DWtype, shift_count_type);
 415 extern DWtype __ashrdi3 (DWtype, shift_count_type);
 416
 417 /* __udiv_w_sdiv is static inline when building other libgcc2 portions.  */
 418 #if (!defined(L_udivdi3) && !defined(L_divdi3) && \
 419      !defined(L_umoddi3) && !defined(L_moddi3))
 420 extern UWtype __udiv_w_sdiv (UWtype *, UWtype, UWtype, UWtype);
 421 #endif
 422
 423 extern cmp_return_type __cmpdi2 (DWtype, DWtype);
 424 extern cmp_return_type __ucmpdi2 (UDWtype, UDWtype);
 425
 426 #if MIN_UNITS_PER_WORD > 1
 427 extern SItype __bswapsi2 (SItype);
 428 #endif
 429 #if __SIZEOF_LONG_LONG__ > 4
 430 extern DItype __bswapdi2 (DItype);
 431 #endif
 432
 433 extern Wtype __absvSI2 (Wtype);
 434 extern Wtype __addvSI3 (Wtype, Wtype);
 435 extern Wtype __subvSI3 (Wtype, Wtype);
 436 extern Wtype __mulvSI3 (Wtype, Wtype);
 437 extern Wtype __negvSI2 (Wtype);
 438 extern DWtype __absvDI2 (DWtype);
 439 extern DWtype __addvDI3 (DWtype, DWtype);
 440 extern DWtype __subvDI3 (DWtype, DWtype);
 441 extern DWtype __mulvDI3 (DWtype, DWtype);
 442 extern DWtype __negvDI2 (DWtype);
 443
 444 #ifdef COMPAT_SIMODE_TRAPPING_ARITHMETIC
 445 #define __absvsi2       __N(absvsi2)
 446 #define __negvsi2       __N(negvsi2)
 447 #define __addvsi3       __N(addvsi3)
 448 #define __subvsi3       __N(subvsi3)
 449 #define __mulvsi3       __N(mulvsi3)
 450
 451 extern SItype __absvsi2 (SItype);
 452 extern SItype __addvsi3 (SItype, SItype);
 453 extern SItype __subvsi3 (SItype, SItype);
 454 extern SItype __mulvsi3 (SItype, SItype);
 455 extern SItype __negvsi2 (SItype);
 456 #endif /* COMPAT_SIMODE_TRAPPING_ARITHMETIC */
 457
 458 #undef int
 459 #if LIBGCC2_HAS_HF_MODE
 460 extern HCtype __divhc3 (HFtype, HFtype, HFtype, HFtype);
 461 extern HCtype __mulhc3 (HFtype, HFtype, HFtype, HFtype);
 462 #endif
 463 #if LIBGCC2_HAS_SF_MODE
 464 extern DWtype __fixsfdi (SFtype);
 465 extern SFtype __floatdisf (DWtype);
 466 extern SFtype __floatundisf (UDWtype);
 467 extern UWtype __fixunssfSI (SFtype);
 468 extern UDWtype __fixunssfDI (SFtype);
 469 extern SFtype __powisf2 (SFtype, int);
 470 extern SCtype __divsc3 (SFtype, SFtype, SFtype, SFtype);
 471 extern SCtype __mulsc3 (SFtype, SFtype, SFtype, SFtype);
 472 #endif
 473 #if LIBGCC2_HAS_DF_MODE
 474 extern DWtype __fixdfdi (DFtype);
 475 extern DFtype __floatdidf (DWtype);
 476 extern DFtype __floatundidf (UDWtype);
 477 extern UWtype __fixunsdfSI (DFtype);
 478 extern UDWtype __fixunsdfDI (DFtype);
 479 extern DFtype __powidf2 (DFtype, int);
 480 extern DCtype __divdc3 (DFtype, DFtype, DFtype, DFtype);
 481 extern DCtype __muldc3 (DFtype, DFtype, DFtype, DFtype);
 482 #endif
 483
 484 #if LIBGCC2_HAS_XF_MODE
 485 extern DWtype __fixxfdi (XFtype);
 486 extern UDWtype __fixunsxfDI (XFtype);
 487 extern XFtype __floatdixf (DWtype);
 488 extern XFtype __floatundixf (UDWtype);
 489 extern UWtype __fixunsxfSI (XFtype);
 490 extern XFtype __powixf2 (XFtype, int);
 491 extern XCtype __divxc3 (XFtype, XFtype, XFtype, XFtype);
 492 extern XCtype __mulxc3 (XFtype, XFtype, XFtype, XFtype);
 493 #endif
 494
 495 #if LIBGCC2_HAS_TF_MODE
 496 extern UDWtype __fixunstfDI (TFtype);
 497 extern DWtype __fixtfdi (TFtype);
 498 extern TFtype __floatditf (DWtype);
 499 extern TFtype __floatunditf (UDWtype);
 500 extern TFtype __powitf2 (TFtype, int);
 501 extern TCtype __divtc3 (TFtype, TFtype, TFtype, TFtype);
 502 extern TCtype __multc3 (TFtype, TFtype, TFtype, TFtype);
 503 #endif
 504 #define int bogus_type
 505
 506 /* DWstructs are pairs of Wtype values in the order determined by
 507    __BYTE_ORDER__.  */
 508
 509 #if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__
 510   struct DWstruct {Wtype high, low;};
 511 #else
 512   struct DWstruct {Wtype low, high;};
 513 #endif
 514
 515 /* We need this union to unpack/pack DImode values, since we don't have
 516    any arithmetic yet.  Incoming DImode parameters are stored into the
 517    `ll' field, and the unpacked result is read from the struct `s'.  */
 518
 519 typedef union
 520 {
 521   struct DWstruct s;
 522   DWtype ll;
 523 } DWunion;
 524
 525 /* Defined for L_popcount_tab.  Exported here because some targets may
 526    want to use it for their own versions of the __popcount builtins.  */
 527 extern const UQItype __popcount_tab[256];
 528
 529 /* Defined for L_clz.  Exported here because some targets may want to use
 530    it for their own versions of the __clz builtins.  It contains the bit
 531    position of the first set bit for the numbers 0 - 255.  This avoids the
 532    need for a separate table for the __ctz builtins.  */
 533 extern const UQItype __clz_tab[256];
 534
 535 #include "longlong.h"
 536
 537 #undef int
 538 extern int __clzDI2 (UDWtype);
 539 extern int __clzSI2 (UWtype);
 540 extern int __ctzSI2 (UWtype);
 541 extern int __ctzDI2 (UDWtype);
 542 extern int __clrsbSI2 (Wtype);
 543 extern int __clrsbDI2 (DWtype);
 544 extern int __ffsSI2 (UWtype);
 545 extern int __ffsDI2 (DWtype);
 546 extern int __popcountSI2 (UWtype);
 547 extern int __popcountDI2 (UDWtype);
 548 extern int __paritySI2 (UWtype);
 549 extern int __parityDI2 (UDWtype);
 550 #define int bogus_type
 551
 552 extern void __enable_execute_stack (void *);
 553
 554 #ifndef HIDE_EXPORTS
 555 #pragma GCC visibility pop
 556 #endif
 557
 558 #endif /* ! GCC_LIBGCC2_H */