gcc/hwint.h

   1 /* HOST_WIDE_INT definitions for the GNU compiler.
   2    Copyright (C) 1998-2021 Free Software Foundation, Inc.
   3
   4    This file is part of GCC.
   5
   6    Provide definitions for macros which depend on HOST_BITS_PER_INT
   7    and HOST_BITS_PER_LONG.  */
   8
   9 #ifndef GCC_HWINT_H
  10 #define GCC_HWINT_H
  11
  12 /* This describes the machine the compiler is hosted on.  */
  13 #define HOST_BITS_PER_CHAR  CHAR_BIT
  14 #define HOST_BITS_PER_SHORT (CHAR_BIT * SIZEOF_SHORT)
  15 #define HOST_BITS_PER_INT   (CHAR_BIT * SIZEOF_INT)
  16 #define HOST_BITS_PER_LONG  (CHAR_BIT * SIZEOF_LONG)
  17 #define HOST_BITS_PER_PTR   (CHAR_BIT * SIZEOF_VOID_P)
  18
  19 /* The string that should be inserted into a printf style format to
  20    indicate a "long" operand.  */
  21 #ifndef HOST_LONG_FORMAT
  22 #define HOST_LONG_FORMAT "l"
  23 #endif
  24
  25 /* The string that should be inserted into a printf style format to
  26    indicate a "long long" operand.  */
  27 #ifndef HOST_LONG_LONG_FORMAT
  28 #define HOST_LONG_LONG_FORMAT "ll"
  29 #endif
  30
  31 /* If HAVE_LONG_LONG and SIZEOF_LONG_LONG aren't defined, but
  32    GCC_VERSION >= 3000, assume this is the second or later stage of a
  33    bootstrap, we do have long long, and it's 64 bits.  (This is
  34    required by C99; we do have some ports that violate that assumption
  35    but they're all cross-compile-only.)  Just in case, force a
  36    constraint violation if that assumption is incorrect.  */
  37 #if !defined HAVE_LONG_LONG
  38 # if GCC_VERSION >= 3000
  39 #  define HAVE_LONG_LONG 1
  40 #  define SIZEOF_LONG_LONG 8
  41 extern char sizeof_long_long_must_be_8[sizeof (long long) == 8 ? 1 : -1];
  42 # endif
  43 #endif
  44
  45 #ifdef HAVE_LONG_LONG
  46 # define HOST_BITS_PER_LONGLONG (CHAR_BIT * SIZEOF_LONG_LONG)
  47 #endif
  48
  49 /* Set HOST_WIDE_INT, this should be always 64 bits.
  50    The underlying type is matched to that of int64_t and assumed
  51    to be either long or long long.  */
  52
  53 #define HOST_BITS_PER_WIDE_INT 64
  54 #if INT64_T_IS_LONG
  55 #   define HOST_WIDE_INT long
  56 #   define HOST_WIDE_INT_C(X) X ## L
  57 #else
  58 # if HOST_BITS_PER_LONGLONG == 64
  59 #   define HOST_WIDE_INT long long
  60 #   define HOST_WIDE_INT_C(X) X ## LL
  61 # else
  62    #error "Unable to find a suitable type for HOST_WIDE_INT"
  63 # endif
  64 #endif
  65
  66 #define HOST_WIDE_INT_UC(X) HOST_WIDE_INT_C (X ## U)
  67 #define HOST_WIDE_INT_0 HOST_WIDE_INT_C (0)
  68 #define HOST_WIDE_INT_0U HOST_WIDE_INT_UC (0)
  69 #define HOST_WIDE_INT_1 HOST_WIDE_INT_C (1)
  70 #define HOST_WIDE_INT_1U HOST_WIDE_INT_UC (1)
  71 #define HOST_WIDE_INT_M1 HOST_WIDE_INT_C (-1)
  72 #define HOST_WIDE_INT_M1U HOST_WIDE_INT_UC (-1)
  73
  74 /* This is a magic identifier which allows GCC to figure out the type
  75    of HOST_WIDE_INT for %wd specifier checks.  You must issue this
  76    typedef before using the __asm_fprintf__ format attribute.  */
  77 typedef HOST_WIDE_INT __gcc_host_wide_int__;
  78
  79 /* Provide C99 <inttypes.h> style format definitions for 64bits.  */
  80 #ifndef HAVE_INTTYPES_H
  81 #if INT64_T_IS_LONG
  82 # define GCC_PRI64 HOST_LONG_FORMAT
  83 #else
  84 # define GCC_PRI64 HOST_LONG_LONG_FORMAT
  85 #endif
  86 #undef PRId64
  87 #define PRId64 GCC_PRI64 "d"
  88 #undef PRIi64
  89 #define PRIi64 GCC_PRI64 "i"
  90 #undef PRIo64
  91 #define PRIo64 GCC_PRI64 "o"
  92 #undef PRIu64
  93 #define PRIu64 GCC_PRI64 "u"
  94 #undef PRIx64
  95 #define PRIx64 GCC_PRI64 "x"
  96 #undef PRIX64
  97 #define PRIX64 GCC_PRI64 "X"
  98 #endif
  99
 100 /* Various printf format strings for HOST_WIDE_INT.  */
 101
 102 #if INT64_T_IS_LONG
 103 # define HOST_WIDE_INT_PRINT HOST_LONG_FORMAT
 104 # define HOST_WIDE_INT_PRINT_C "L"
 105 #else
 106 # define HOST_WIDE_INT_PRINT HOST_LONG_LONG_FORMAT
 107 # define HOST_WIDE_INT_PRINT_C "LL"
 108 #endif
 109
 110 #define HOST_WIDE_INT_PRINT_DEC "%" PRId64
 111 #define HOST_WIDE_INT_PRINT_DEC_C "%" PRId64 HOST_WIDE_INT_PRINT_C
 112 #define HOST_WIDE_INT_PRINT_UNSIGNED "%" PRIu64
 113 #define HOST_WIDE_INT_PRINT_HEX "%#" PRIx64
 114 #define HOST_WIDE_INT_PRINT_HEX_PURE "%" PRIx64
 115 #define HOST_WIDE_INT_PRINT_DOUBLE_HEX "0x%" PRIx64 "%016" PRIx64
 116 #define HOST_WIDE_INT_PRINT_PADDED_HEX "%016" PRIx64
 117
 118 /* Define HOST_WIDEST_FAST_INT to the widest integer type supported
 119    efficiently in hardware.  (That is, the widest integer type that fits
 120    in a hardware register.)  Normally this is "long" but on some hosts it
 121    should be "long long" or "__int64".  This is no convenient way to
 122    autodetect this, so such systems must set a flag in config.host; see there
 123    for details.  */
 124
 125 #ifdef USE_LONG_LONG_FOR_WIDEST_FAST_INT
 126 #  ifdef HAVE_LONG_LONG
 127 #    define HOST_WIDEST_FAST_INT long long
 128 #    define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONGLONG
 129 #  else
 130 #    error "Your host said it wanted to use long long but that does not exist"
 131 #  endif
 132 #else
 133 #  define HOST_WIDEST_FAST_INT long
 134 #  define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONG
 135 #endif
 136
 137 /* Inline functions operating on HOST_WIDE_INT.  */
 138
 139 /* Return X with all but the lowest bit masked off.  */
 140
 141 static inline unsigned HOST_WIDE_INT
 142 least_bit_hwi (unsigned HOST_WIDE_INT x)
 143 {
 144   return (x & -x);
 145 }
 146
 147 /* True if X is zero or a power of two.  */
 148
 149 static inline bool
 150 pow2_or_zerop (unsigned HOST_WIDE_INT x)
 151 {
 152   return least_bit_hwi (x) == x;
 153 }
 154
 155 /* True if X is a power of two.  */
 156
 157 static inline bool
 158 pow2p_hwi (unsigned HOST_WIDE_INT x)
 159 {
 160   return x && pow2_or_zerop (x);
 161 }
 162
 163 #if GCC_VERSION < 3004
 164
 165 extern int clz_hwi (unsigned HOST_WIDE_INT x);
 166 extern int ctz_hwi (unsigned HOST_WIDE_INT x);
 167 extern int ffs_hwi (unsigned HOST_WIDE_INT x);
 168
 169 /* Return the number of set bits in X.  */
 170 extern int popcount_hwi (unsigned HOST_WIDE_INT x);
 171
 172 /* Return log2, or -1 if not exact.  */
 173 extern int exact_log2                  (unsigned HOST_WIDE_INT);
 174
 175 /* Return floor of log2, with -1 for zero.  */
 176 extern int floor_log2                  (unsigned HOST_WIDE_INT);
 177
 178 /* Return the smallest n such that 2**n >= X.  */
 179 extern int ceil_log2                    (unsigned HOST_WIDE_INT);
 180
 181 #else /* GCC_VERSION >= 3004 */
 182
 183 /* For convenience, define 0 -> word_size.  */
 184 static inline int
 185 clz_hwi (unsigned HOST_WIDE_INT x)
 186 {
 187   if (x == 0)
 188     return HOST_BITS_PER_WIDE_INT;
 189 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 190   return __builtin_clzl (x);
 191 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 192   return __builtin_clzll (x);
 193 # else
 194   return __builtin_clz (x);
 195 # endif
 196 }
 197
 198 static inline int
 199 ctz_hwi (unsigned HOST_WIDE_INT x)
 200 {
 201   if (x == 0)
 202     return HOST_BITS_PER_WIDE_INT;
 203 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 204   return __builtin_ctzl (x);
 205 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 206   return __builtin_ctzll (x);
 207 # else
 208   return __builtin_ctz (x);
 209 # endif
 210 }
 211
 212 static inline int
 213 ffs_hwi (unsigned HOST_WIDE_INT x)
 214 {
 215 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 216   return __builtin_ffsl (x);
 217 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 218   return __builtin_ffsll (x);
 219 # else
 220   return __builtin_ffs (x);
 221 # endif
 222 }
 223
 224 static inline int
 225 popcount_hwi (unsigned HOST_WIDE_INT x)
 226 {
 227 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 228   return __builtin_popcountl (x);
 229 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 230   return __builtin_popcountll (x);
 231 # else
 232   return __builtin_popcount (x);
 233 # endif
 234 }
 235
 236 static inline int
 237 floor_log2 (unsigned HOST_WIDE_INT x)
 238 {
 239   return HOST_BITS_PER_WIDE_INT - 1 - clz_hwi (x);
 240 }
 241
 242 static inline int
 243 ceil_log2 (unsigned HOST_WIDE_INT x)
 244 {
 245   return x == 0 ? 0 : floor_log2 (x - 1) + 1;
 246 }
 247
 248 static inline int
 249 exact_log2 (unsigned HOST_WIDE_INT x)
 250 {
 251   return pow2p_hwi (x) ? ctz_hwi (x) : -1;
 252 }
 253
 254 #endif /* GCC_VERSION >= 3004 */
 255
 256 #define HOST_WIDE_INT_MIN (HOST_WIDE_INT) \
 257   (HOST_WIDE_INT_1U << (HOST_BITS_PER_WIDE_INT - 1))
 258 #define HOST_WIDE_INT_MAX (~(HOST_WIDE_INT_MIN))
 259
 260 extern HOST_WIDE_INT abs_hwi (HOST_WIDE_INT);
 261 extern unsigned HOST_WIDE_INT absu_hwi (HOST_WIDE_INT);
 262 extern HOST_WIDE_INT gcd (HOST_WIDE_INT, HOST_WIDE_INT);
 263 extern HOST_WIDE_INT pos_mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 264 extern HOST_WIDE_INT mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 265 extern HOST_WIDE_INT least_common_multiple (HOST_WIDE_INT, HOST_WIDE_INT);
 266
 267 /* Like ctz_hwi, except 0 when x == 0.  */
 268
 269 static inline int
 270 ctz_or_zero (unsigned HOST_WIDE_INT x)
 271 {
 272   return ffs_hwi (x) - 1;
 273 }
 274
 275 /* Sign extend SRC starting from PREC.  */
 276
 277 static inline HOST_WIDE_INT
 278 sext_hwi (HOST_WIDE_INT src, unsigned int prec)
 279 {
 280   if (prec == HOST_BITS_PER_WIDE_INT)
 281     return src;
 282   else
 283 #if defined (__GNUC__)
 284     {
 285       /* Take the faster path if the implementation-defined bits it's relying
 286          on are implemented the way we expect them to be.  Namely, conversion
 287          from unsigned to signed preserves bit pattern, and right shift of
 288          a signed value propagates the sign bit.
 289          We have to convert from signed to unsigned and back, because when left
 290          shifting signed values, any overflow is undefined behavior.  */
 291       gcc_checking_assert (prec < HOST_BITS_PER_WIDE_INT);
 292       int shift = HOST_BITS_PER_WIDE_INT - prec;
 293       return ((HOST_WIDE_INT) ((unsigned HOST_WIDE_INT) src << shift)) >> shift;
 294     }
 295 #else
 296     {
 297       /* Fall back to the slower, well defined path otherwise.  */
 298       gcc_checking_assert (prec < HOST_BITS_PER_WIDE_INT);
 299       HOST_WIDE_INT sign_mask = HOST_WIDE_INT_1 << (prec - 1);
 300       HOST_WIDE_INT value_mask = (HOST_WIDE_INT_1U << prec) - HOST_WIDE_INT_1U;
 301       return (((src & value_mask) ^ sign_mask) - sign_mask);
 302     }
 303 #endif
 304 }
 305
 306 /* Zero extend SRC starting from PREC.  */
 307 static inline unsigned HOST_WIDE_INT
 308 zext_hwi (unsigned HOST_WIDE_INT src, unsigned int prec)
 309 {
 310   if (prec == HOST_BITS_PER_WIDE_INT)
 311     return src;
 312   else
 313     {
 314       gcc_checking_assert (prec < HOST_BITS_PER_WIDE_INT);
 315       return src & ((HOST_WIDE_INT_1U << prec) - 1);
 316     }
 317 }
 318
 319 /* Compute the absolute value of X.  */
 320
 321 inline HOST_WIDE_INT
 322 abs_hwi (HOST_WIDE_INT x)
 323 {
 324   gcc_checking_assert (x != HOST_WIDE_INT_MIN);
 325   return x >= 0 ? x : -x;
 326 }
 327
 328 /* Compute the absolute value of X as an unsigned type.  */
 329
 330 inline unsigned HOST_WIDE_INT
 331 absu_hwi (HOST_WIDE_INT x)
 332 {
 333   return x >= 0 ? (unsigned HOST_WIDE_INT)x : -(unsigned HOST_WIDE_INT)x;
 334 }
 335
 336 /* Compute the sum of signed A and B and indicate in *OVERFLOW whether
 337    that operation overflowed.  */
 338
 339 inline HOST_WIDE_INT
 340 add_hwi (HOST_WIDE_INT a, HOST_WIDE_INT b, bool *overflow)
 341 {
 342 #if GCC_VERSION < 11000
 343   unsigned HOST_WIDE_INT result = a + (unsigned HOST_WIDE_INT)b;
 344   if ((((result ^ a) & (result ^ b))
 345        >> (HOST_BITS_PER_WIDE_INT - 1)) & 1)
 346     *overflow = true;
 347   else
 348     *overflow = false;
 349   return result;
 350 #else
 351   HOST_WIDE_INT result;
 352   *overflow = __builtin_add_overflow (a, b, &result);
 353   return result;
 354 #endif
 355 }
 356
 357 /* Compute the product of signed A and B and indicate in *OVERFLOW whether
 358    that operation overflowed.  */
 359
 360 inline HOST_WIDE_INT
 361 mul_hwi (HOST_WIDE_INT a, HOST_WIDE_INT b, bool *overflow)
 362 {
 363 #if GCC_VERSION < 11000
 364   unsigned HOST_WIDE_INT result = a * (unsigned HOST_WIDE_INT)b;
 365   if ((a == -1 && b == HOST_WIDE_INT_MIN)
 366       || (a != 0 && (HOST_WIDE_INT)result / a != b))
 367     *overflow = true;
 368   else
 369     *overflow = false;
 370   return result;
 371 #else
 372   HOST_WIDE_INT result;
 373   *overflow = __builtin_mul_overflow (a, b, &result);
 374   return result;
 375 #endif
 376 }
 377
 378 #endif /* ! GCC_HWINT_H */