gcc/hwint.h

   1 /* HOST_WIDE_INT definitions for the GNU compiler.
   2    Copyright (C) 1998, 2002, 2004, 2008, 2009, 2010
   3    Free Software Foundation, Inc.
   4
   5    This file is part of GCC.
   6
   7    Provide definitions for macros which depend on HOST_BITS_PER_INT
   8    and HOST_BITS_PER_LONG.  */
   9
  10 #ifndef GCC_HWINT_H
  11 #define GCC_HWINT_H
  12
  13 /* This describes the machine the compiler is hosted on.  */
  14 #define HOST_BITS_PER_CHAR  CHAR_BIT
  15 #define HOST_BITS_PER_SHORT (CHAR_BIT * SIZEOF_SHORT)
  16 #define HOST_BITS_PER_INT   (CHAR_BIT * SIZEOF_INT)
  17 #define HOST_BITS_PER_LONG  (CHAR_BIT * SIZEOF_LONG)
  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 #ifdef HAVE___INT64
  49 # define HOST_BITS_PER___INT64 (CHAR_BIT * SIZEOF___INT64)
  50 #endif
  51
  52 /* Set HOST_WIDE_INT.  This should be the widest efficient host
  53    integer type.  It can be 32 or 64 bits, except that if we are
  54    targeting a machine with 64-bit size_t then it has to be 64 bits.
  55
  56    With a sane ABI, 'long' is the largest efficient host integer type.
  57    Thus, we use that unless we have to use 'long long' or '__int64'
  58    because we're targeting a 64-bit machine from a 32-bit host.  */
  59
  60 #if HOST_BITS_PER_LONG >= 64 || !defined NEED_64BIT_HOST_WIDE_INT
  61 #   define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONG
  62 #   define HOST_WIDE_INT long
  63 #else
  64 # if HOST_BITS_PER_LONGLONG >= 64
  65 #   define HOST_BITS_PER_WIDE_INT HOST_BITS_PER_LONGLONG
  66 #   define HOST_WIDE_INT long long
  67 # else
  68 #  if HOST_BITS_PER___INT64 >= 64
  69 #   define HOST_BITS_PER_WIDE_INT HOST_BITS_PER___INT64
  70 #   define HOST_WIDE_INT __int64
  71 #  else
  72     #error "Unable to find a suitable type for HOST_WIDE_INT"
  73 #  endif
  74 # endif
  75 #endif
  76
  77 /* Various printf format strings for HOST_WIDE_INT.  */
  78
  79 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
  80 # define HOST_WIDE_INT_PRINT HOST_LONG_FORMAT
  81 # define HOST_WIDE_INT_PRINT_C "L"
  82 # define HOST_WIDE_INT_1 1L
  83   /* 'long' might be 32 or 64 bits, and the number of leading zeroes
  84      must be tweaked accordingly.  */
  85 # if HOST_BITS_PER_WIDE_INT == 64
  86 #  define HOST_WIDE_INT_PRINT_DOUBLE_HEX \
  87      "0x%" HOST_LONG_FORMAT "x%016" HOST_LONG_FORMAT "x"
  88 # else
  89 #  define HOST_WIDE_INT_PRINT_DOUBLE_HEX \
  90      "0x%" HOST_LONG_FORMAT "x%08" HOST_LONG_FORMAT "x"
  91 # endif
  92 #else
  93 # define HOST_WIDE_INT_PRINT HOST_LONG_LONG_FORMAT
  94 # define HOST_WIDE_INT_PRINT_C "LL"
  95 # define HOST_WIDE_INT_1 1LL
  96   /* We can assume that 'long long' is at least 64 bits.  */
  97 # define HOST_WIDE_INT_PRINT_DOUBLE_HEX \
  98     "0x%" HOST_LONG_LONG_FORMAT "x%016" HOST_LONG_LONG_FORMAT "x"
  99 #endif /* HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG */
 100
 101 #define HOST_WIDE_INT_PRINT_DEC "%" HOST_WIDE_INT_PRINT "d"
 102 #define HOST_WIDE_INT_PRINT_DEC_C HOST_WIDE_INT_PRINT_DEC HOST_WIDE_INT_PRINT_C
 103 #define HOST_WIDE_INT_PRINT_UNSIGNED "%" HOST_WIDE_INT_PRINT "u"
 104 #define HOST_WIDE_INT_PRINT_HEX "%#" HOST_WIDE_INT_PRINT "x"
 105 #define HOST_WIDE_INT_PRINT_HEX_PURE "%" HOST_WIDE_INT_PRINT "x"
 106
 107 /* Set HOST_WIDEST_INT.  This is a 64-bit type unless the compiler
 108    in use has no 64-bit type at all; in that case it's 32 bits.  */
 109
 110 #if HOST_BITS_PER_WIDE_INT >= 64 \
 111     || (HOST_BITS_PER_LONGLONG < 64 && HOST_BITS_PER___INT64 < 64)
 112 # define HOST_WIDEST_INT                      HOST_WIDE_INT
 113 # define HOST_BITS_PER_WIDEST_INT             HOST_BITS_PER_WIDE_INT
 114 # define HOST_WIDEST_INT_PRINT                HOST_WIDE_INT_PRINT
 115 # define HOST_WIDEST_INT_PRINT_DEC            HOST_WIDE_INT_PRINT_DEC
 116 # define HOST_WIDEST_INT_PRINT_DEC_C          HOST_WIDE_INT_PRINT_DEC_C
 117 # define HOST_WIDEST_INT_PRINT_UNSIGNED       HOST_WIDE_INT_PRINT_UNSIGNED
 118 # define HOST_WIDEST_INT_PRINT_HEX            HOST_WIDE_INT_PRINT_HEX
 119 # define HOST_WIDEST_INT_PRINT_DOUBLE_HEX     HOST_WIDE_INT_PRINT_DOUBLE_HEX
 120 #else
 121 # if HOST_BITS_PER_LONGLONG >= 64
 122 #  define HOST_BITS_PER_WIDEST_INT            HOST_BITS_PER_LONGLONG
 123 #  define HOST_WIDEST_INT                     long long
 124 # else
 125 #  if HOST_BITS_PER___INT64 >= 64
 126 #   define HOST_BITS_PER_WIDEST_INT           HOST_BITS_PER___INT64
 127 #   define HOST_WIDEST_INT                    __int64
 128 #  else
 129     #error "This line should be impossible to reach"
 130 #  endif
 131 # endif
 132 # define HOST_WIDEST_INT_PRINT                HOST_LONG_LONG_FORMAT
 133 # define HOST_WIDEST_INT_PRINT_DEC            "%" HOST_LONG_LONG_FORMAT "d"
 134 # define HOST_WIDEST_INT_PRINT_DEC_C          "%" HOST_LONG_LONG_FORMAT "dLL"
 135 # define HOST_WIDEST_INT_PRINT_UNSIGNED       "%" HOST_LONG_LONG_FORMAT "u"
 136 # define HOST_WIDEST_INT_PRINT_HEX            "%#" HOST_LONG_LONG_FORMAT "x"
 137 # define HOST_WIDEST_INT_PRINT_DOUBLE_HEX     \
 138     "0x%" HOST_LONG_LONG_FORMAT "x%016" HOST_LONG_LONG_FORMAT "x"
 139 #endif
 140
 141 /* Define HOST_WIDEST_FAST_INT to the widest integer type supported
 142    efficiently in hardware.  (That is, the widest integer type that fits
 143    in a hardware register.)  Normally this is "long" but on some hosts it
 144    should be "long long" or "__int64".  This is no convenient way to
 145    autodetect this, so such systems must set a flag in config.host; see there
 146    for details.  */
 147
 148 #ifdef USE_LONG_LONG_FOR_WIDEST_FAST_INT
 149 #  ifdef HAVE_LONG_LONG
 150 #    define HOST_WIDEST_FAST_INT long long
 151 #    define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONGLONG
 152 #  elif defined (HAVE___INT64)
 153 #    define HOST_WIDEST_FAST_INT __int64
 154 #    define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER___INT64
 155 #  else
 156 #    error "Your host said it wanted to use long long or __int64 but neither"
 157 #    error "exist"
 158 #  endif
 159 #else
 160 #  define HOST_WIDEST_FAST_INT long
 161 #  define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONG
 162 #endif
 163
 164 /* Inline functions operating on HOST_WIDE_INT.  */
 165 #if GCC_VERSION < 3004
 166
 167 extern int clz_hwi (unsigned HOST_WIDE_INT x);
 168 extern int ctz_hwi (unsigned HOST_WIDE_INT x);
 169 extern int ffs_hwi (unsigned HOST_WIDE_INT x);
 170
 171 /* Return log2, or -1 if not exact.  */
 172 extern int exact_log2                  (unsigned HOST_WIDE_INT);
 173
 174 /* Return floor of log2, with -1 for zero.  */
 175 extern int floor_log2                  (unsigned HOST_WIDE_INT);
 176
 177 #else /* GCC_VERSION >= 3004 */
 178
 179 /* For convenience, define 0 -> word_size.  */
 180 static inline int
 181 clz_hwi (unsigned HOST_WIDE_INT x)
 182 {
 183   if (x == 0)
 184     return HOST_BITS_PER_WIDE_INT;
 185 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 186   return __builtin_clzl (x);
 187 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 188   return __builtin_clzll (x);
 189 # else
 190   return __builtin_clz (x);
 191 # endif
 192 }
 193
 194 static inline int
 195 ctz_hwi (unsigned HOST_WIDE_INT x)
 196 {
 197   if (x == 0)
 198     return HOST_BITS_PER_WIDE_INT;
 199 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 200   return __builtin_ctzl (x);
 201 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 202   return __builtin_ctzll (x);
 203 # else
 204   return __builtin_ctz (x);
 205 # endif
 206 }
 207
 208 static inline int
 209 ffs_hwi (unsigned HOST_WIDE_INT x)
 210 {
 211 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 212   return __builtin_ffsl (x);
 213 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 214   return __builtin_ffsll (x);
 215 # else
 216   return __builtin_ffs (x);
 217 # endif
 218 }
 219
 220 static inline int
 221 floor_log2 (unsigned HOST_WIDE_INT x)
 222 {
 223   return HOST_BITS_PER_WIDE_INT - 1 - clz_hwi (x);
 224 }
 225
 226 static inline int
 227 exact_log2 (unsigned HOST_WIDE_INT x)
 228 {
 229   return x == (x & -x) && x ? ctz_hwi (x) : -1;
 230 }
 231
 232 #endif /* GCC_VERSION >= 3004 */
 233
 234 #define HOST_WIDE_INT_MIN (HOST_WIDE_INT) \
 235   ((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1))
 236 #define HOST_WIDE_INT_MAX (~(HOST_WIDE_INT_MIN))
 237
 238 extern HOST_WIDE_INT abs_hwi (HOST_WIDE_INT);
 239 extern unsigned HOST_WIDE_INT absu_hwi (HOST_WIDE_INT);
 240 extern HOST_WIDE_INT gcd (HOST_WIDE_INT, HOST_WIDE_INT);
 241 extern HOST_WIDE_INT pos_mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 242 extern HOST_WIDE_INT mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 243 extern HOST_WIDE_INT least_common_multiple (HOST_WIDE_INT, HOST_WIDE_INT);
 244
 245 #endif /* ! GCC_HWINT_H */