gcc/hwint.h

   1 /* HOST_WIDE_INT definitions for the GNU compiler.
   2    Copyright (C) 1998-2016 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
  18 /* The string that should be inserted into a printf style format to
  19    indicate a "long" operand.  */
  20 #ifndef HOST_LONG_FORMAT
  21 #define HOST_LONG_FORMAT "l"
  22 #endif
  23
  24 /* The string that should be inserted into a printf style format to
  25    indicate a "long long" operand.  */
  26 #ifndef HOST_LONG_LONG_FORMAT
  27 #define HOST_LONG_LONG_FORMAT "ll"
  28 #endif
  29
  30 /* If HAVE_LONG_LONG and SIZEOF_LONG_LONG aren't defined, but
  31    GCC_VERSION >= 3000, assume this is the second or later stage of a
  32    bootstrap, we do have long long, and it's 64 bits.  (This is
  33    required by C99; we do have some ports that violate that assumption
  34    but they're all cross-compile-only.)  Just in case, force a
  35    constraint violation if that assumption is incorrect.  */
  36 #if !defined HAVE_LONG_LONG
  37 # if GCC_VERSION >= 3000
  38 #  define HAVE_LONG_LONG 1
  39 #  define SIZEOF_LONG_LONG 8
  40 extern char sizeof_long_long_must_be_8[sizeof (long long) == 8 ? 1 : -1];
  41 # endif
  42 #endif
  43
  44 #ifdef HAVE_LONG_LONG
  45 # define HOST_BITS_PER_LONGLONG (CHAR_BIT * SIZEOF_LONG_LONG)
  46 #endif
  47
  48 /* Set HOST_WIDE_INT, this should be always 64 bits.
  49    The underlying type is matched to that of int64_t and assumed
  50    to be either long or long long.  */
  51
  52 #define HOST_BITS_PER_WIDE_INT 64
  53 #if INT64_T_IS_LONG
  54 #   define HOST_WIDE_INT long
  55 #   define HOST_WIDE_INT_C(X) X ## L
  56 #else
  57 # if HOST_BITS_PER_LONGLONG == 64
  58 #   define HOST_WIDE_INT long long
  59 #   define HOST_WIDE_INT_C(X) X ## LL
  60 # else
  61    #error "Unable to find a suitable type for HOST_WIDE_INT"
  62 # endif
  63 #endif
  64
  65 #define HOST_WIDE_INT_UC(X) HOST_WIDE_INT_C (X ## U)
  66 #define HOST_WIDE_INT_1 HOST_WIDE_INT_C (1)
  67 #define HOST_WIDE_INT_1U HOST_WIDE_INT_UC (1)
  68 #define HOST_WIDE_INT_M1 HOST_WIDE_INT_C (-1)
  69 #define HOST_WIDE_INT_M1U HOST_WIDE_INT_UC (-1)
  70
  71 /* This is a magic identifier which allows GCC to figure out the type
  72    of HOST_WIDE_INT for %wd specifier checks.  You must issue this
  73    typedef before using the __asm_fprintf__ format attribute.  */
  74 typedef HOST_WIDE_INT __gcc_host_wide_int__;
  75
  76 /* Provide C99 <inttypes.h> style format definitions for 64bits.  */
  77 #ifndef HAVE_INTTYPES_H
  78 #if INT64_T_IS_LONG
  79 # define GCC_PRI64 HOST_LONG_FORMAT
  80 #else
  81 # define GCC_PRI64 HOST_LONG_LONG_FORMAT
  82 #endif
  83 #undef PRId64
  84 #define PRId64 GCC_PRI64 "d"
  85 #undef PRIi64
  86 #define PRIi64 GCC_PRI64 "i"
  87 #undef PRIo64
  88 #define PRIo64 GCC_PRI64 "o"
  89 #undef PRIu64
  90 #define PRIu64 GCC_PRI64 "u"
  91 #undef PRIx64
  92 #define PRIx64 GCC_PRI64 "x"
  93 #undef PRIX64
  94 #define PRIX64 GCC_PRI64 "X"
  95 #endif
  96
  97 /* Various printf format strings for HOST_WIDE_INT.  */
  98
  99 #if INT64_T_IS_LONG
 100 # define HOST_WIDE_INT_PRINT HOST_LONG_FORMAT
 101 # define HOST_WIDE_INT_PRINT_C "L"
 102 #else
 103 # define HOST_WIDE_INT_PRINT HOST_LONG_LONG_FORMAT
 104 # define HOST_WIDE_INT_PRINT_C "LL"
 105 #endif
 106
 107 #define HOST_WIDE_INT_PRINT_DEC "%" PRId64
 108 #define HOST_WIDE_INT_PRINT_DEC_C "%" PRId64 HOST_WIDE_INT_PRINT_C
 109 #define HOST_WIDE_INT_PRINT_UNSIGNED "%" PRIu64
 110 #define HOST_WIDE_INT_PRINT_HEX "%#" PRIx64
 111 #define HOST_WIDE_INT_PRINT_HEX_PURE "%" PRIx64
 112 #define HOST_WIDE_INT_PRINT_DOUBLE_HEX "0x%" PRIx64 "%016" PRIx64
 113 #define HOST_WIDE_INT_PRINT_PADDED_HEX "%016" PRIx64
 114
 115 /* Define HOST_WIDEST_FAST_INT to the widest integer type supported
 116    efficiently in hardware.  (That is, the widest integer type that fits
 117    in a hardware register.)  Normally this is "long" but on some hosts it
 118    should be "long long" or "__int64".  This is no convenient way to
 119    autodetect this, so such systems must set a flag in config.host; see there
 120    for details.  */
 121
 122 #ifdef USE_LONG_LONG_FOR_WIDEST_FAST_INT
 123 #  ifdef HAVE_LONG_LONG
 124 #    define HOST_WIDEST_FAST_INT long long
 125 #    define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONGLONG
 126 #  else
 127 #    error "Your host said it wanted to use long long but that does not exist"
 128 #  endif
 129 #else
 130 #  define HOST_WIDEST_FAST_INT long
 131 #  define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONG
 132 #endif
 133
 134 /* Inline functions operating on HOST_WIDE_INT.  */
 135 #if GCC_VERSION < 3004
 136
 137 extern int clz_hwi (unsigned HOST_WIDE_INT x);
 138 extern int ctz_hwi (unsigned HOST_WIDE_INT x);
 139 extern int ffs_hwi (unsigned HOST_WIDE_INT x);
 140
 141 /* Return the number of set bits in X.  */
 142 extern int popcount_hwi (unsigned HOST_WIDE_INT x);
 143
 144 /* Return log2, or -1 if not exact.  */
 145 extern int exact_log2                  (unsigned HOST_WIDE_INT);
 146
 147 /* Return floor of log2, with -1 for zero.  */
 148 extern int floor_log2                  (unsigned HOST_WIDE_INT);
 149
 150 /* Return the smallest n such that 2**n >= X.  */
 151 extern int ceil_log2                    (unsigned HOST_WIDE_INT);
 152
 153 #else /* GCC_VERSION >= 3004 */
 154
 155 /* For convenience, define 0 -> word_size.  */
 156 static inline int
 157 clz_hwi (unsigned HOST_WIDE_INT x)
 158 {
 159   if (x == 0)
 160     return HOST_BITS_PER_WIDE_INT;
 161 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 162   return __builtin_clzl (x);
 163 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 164   return __builtin_clzll (x);
 165 # else
 166   return __builtin_clz (x);
 167 # endif
 168 }
 169
 170 static inline int
 171 ctz_hwi (unsigned HOST_WIDE_INT x)
 172 {
 173   if (x == 0)
 174     return HOST_BITS_PER_WIDE_INT;
 175 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 176   return __builtin_ctzl (x);
 177 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 178   return __builtin_ctzll (x);
 179 # else
 180   return __builtin_ctz (x);
 181 # endif
 182 }
 183
 184 static inline int
 185 ffs_hwi (unsigned HOST_WIDE_INT x)
 186 {
 187 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 188   return __builtin_ffsl (x);
 189 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 190   return __builtin_ffsll (x);
 191 # else
 192   return __builtin_ffs (x);
 193 # endif
 194 }
 195
 196 static inline int
 197 popcount_hwi (unsigned HOST_WIDE_INT x)
 198 {
 199 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 200   return __builtin_popcountl (x);
 201 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 202   return __builtin_popcountll (x);
 203 # else
 204   return __builtin_popcount (x);
 205 # endif
 206 }
 207
 208 static inline int
 209 floor_log2 (unsigned HOST_WIDE_INT x)
 210 {
 211   return HOST_BITS_PER_WIDE_INT - 1 - clz_hwi (x);
 212 }
 213
 214 static inline int
 215 ceil_log2 (unsigned HOST_WIDE_INT x)
 216 {
 217   return floor_log2 (x - 1) + 1;
 218 }
 219
 220 static inline int
 221 exact_log2 (unsigned HOST_WIDE_INT x)
 222 {
 223   return x == (x & -x) && x ? ctz_hwi (x) : -1;
 224 }
 225
 226 #endif /* GCC_VERSION >= 3004 */
 227
 228 #define HOST_WIDE_INT_MIN (HOST_WIDE_INT) \
 229   ((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1))
 230 #define HOST_WIDE_INT_MAX (~(HOST_WIDE_INT_MIN))
 231
 232 extern HOST_WIDE_INT abs_hwi (HOST_WIDE_INT);
 233 extern unsigned HOST_WIDE_INT absu_hwi (HOST_WIDE_INT);
 234 extern HOST_WIDE_INT gcd (HOST_WIDE_INT, HOST_WIDE_INT);
 235 extern HOST_WIDE_INT pos_mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 236 extern HOST_WIDE_INT mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 237 extern HOST_WIDE_INT least_common_multiple (HOST_WIDE_INT, HOST_WIDE_INT);
 238
 239 /* Sign extend SRC starting from PREC.  */
 240
 241 static inline HOST_WIDE_INT
 242 sext_hwi (HOST_WIDE_INT src, unsigned int prec)
 243 {
 244   if (prec == HOST_BITS_PER_WIDE_INT)
 245     return src;
 246   else
 247 #if defined (__GNUC__)
 248     {
 249       /* Take the faster path if the implementation-defined bits it's relying
 250          on are implemented the way we expect them to be.  Namely, conversion
 251          from unsigned to signed preserves bit pattern, and right shift of
 252          a signed value propagates the sign bit.
 253          We have to convert from signed to unsigned and back, because when left
 254          shifting signed values, any overflow is undefined behavior.  */
 255       gcc_checking_assert (prec < HOST_BITS_PER_WIDE_INT);
 256       int shift = HOST_BITS_PER_WIDE_INT - prec;
 257       return ((HOST_WIDE_INT) ((unsigned HOST_WIDE_INT) src << shift)) >> shift;
 258     }
 259 #else
 260     {
 261       /* Fall back to the slower, well defined path otherwise.  */
 262       gcc_checking_assert (prec < HOST_BITS_PER_WIDE_INT);
 263       HOST_WIDE_INT sign_mask = HOST_WIDE_INT_1 << (prec - 1);
 264       HOST_WIDE_INT value_mask = (HOST_WIDE_INT_1U << prec) - HOST_WIDE_INT_1U;
 265       return (((src & value_mask) ^ sign_mask) - sign_mask);
 266     }
 267 #endif
 268 }
 269
 270 /* Zero extend SRC starting from PREC.  */
 271 static inline unsigned HOST_WIDE_INT
 272 zext_hwi (unsigned HOST_WIDE_INT src, unsigned int prec)
 273 {
 274   if (prec == HOST_BITS_PER_WIDE_INT)
 275     return src;
 276   else
 277     {
 278       gcc_checking_assert (prec < HOST_BITS_PER_WIDE_INT);
 279       return src & (((unsigned HOST_WIDE_INT) 1 << prec) - 1);
 280     }
 281 }
 282
 283 /* Compute the absolute value of X.  */
 284
 285 inline HOST_WIDE_INT
 286 abs_hwi (HOST_WIDE_INT x)
 287 {
 288   gcc_checking_assert (x != HOST_WIDE_INT_MIN);
 289   return x >= 0 ? x : -x;
 290 }
 291
 292 /* Compute the absolute value of X as an unsigned type.  */
 293
 294 inline unsigned HOST_WIDE_INT
 295 absu_hwi (HOST_WIDE_INT x)
 296 {
 297   return x >= 0 ? (unsigned HOST_WIDE_INT)x : -(unsigned HOST_WIDE_INT)x;
 298 }
 299
 300 #endif /* ! GCC_HWINT_H */