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 /* This is a magic identifier which allows GCC to figure out the type
  78    of HOST_WIDE_INT for %wd specifier checks.  You must issue this
  79    typedef before using the __asm_fprintf__ format attribute.  */
  80 typedef HOST_WIDE_INT __gcc_host_wide_int__;
  81
  82 /* Various printf format strings for HOST_WIDE_INT.  */
  83
  84 #if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
  85 # define HOST_WIDE_INT_PRINT HOST_LONG_FORMAT
  86 # define HOST_WIDE_INT_PRINT_C "L"
  87 # define HOST_WIDE_INT_1 1L
  88   /* 'long' might be 32 or 64 bits, and the number of leading zeroes
  89      must be tweaked accordingly.  */
  90 # if HOST_BITS_PER_WIDE_INT == 64
  91 #  define HOST_WIDE_INT_PRINT_DOUBLE_HEX \
  92      "0x%" HOST_LONG_FORMAT "x%016" HOST_LONG_FORMAT "x"
  93 # else
  94 #  define HOST_WIDE_INT_PRINT_DOUBLE_HEX \
  95      "0x%" HOST_LONG_FORMAT "x%08" HOST_LONG_FORMAT "x"
  96 # endif
  97 #else
  98 # define HOST_WIDE_INT_PRINT HOST_LONG_LONG_FORMAT
  99 # define HOST_WIDE_INT_PRINT_C "LL"
 100 # define HOST_WIDE_INT_1 1LL
 101   /* We can assume that 'long long' is at least 64 bits.  */
 102 # define HOST_WIDE_INT_PRINT_DOUBLE_HEX \
 103     "0x%" HOST_LONG_LONG_FORMAT "x%016" HOST_LONG_LONG_FORMAT "x"
 104 #endif /* HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG */
 105
 106 #define HOST_WIDE_INT_PRINT_DEC "%" HOST_WIDE_INT_PRINT "d"
 107 #define HOST_WIDE_INT_PRINT_DEC_C HOST_WIDE_INT_PRINT_DEC HOST_WIDE_INT_PRINT_C
 108 #define HOST_WIDE_INT_PRINT_UNSIGNED "%" HOST_WIDE_INT_PRINT "u"
 109 #define HOST_WIDE_INT_PRINT_HEX "%#" HOST_WIDE_INT_PRINT "x"
 110 #define HOST_WIDE_INT_PRINT_HEX_PURE "%" HOST_WIDE_INT_PRINT "x"
 111
 112 /* Set HOST_WIDEST_INT.  This is a 64-bit type unless the compiler
 113    in use has no 64-bit type at all; in that case it's 32 bits.  */
 114
 115 #if HOST_BITS_PER_WIDE_INT >= 64 \
 116     || (HOST_BITS_PER_LONGLONG < 64 && HOST_BITS_PER___INT64 < 64)
 117 # define HOST_WIDEST_INT                      HOST_WIDE_INT
 118 # define HOST_BITS_PER_WIDEST_INT             HOST_BITS_PER_WIDE_INT
 119 # define HOST_WIDEST_INT_PRINT                HOST_WIDE_INT_PRINT
 120 # define HOST_WIDEST_INT_PRINT_DEC            HOST_WIDE_INT_PRINT_DEC
 121 # define HOST_WIDEST_INT_PRINT_DEC_C          HOST_WIDE_INT_PRINT_DEC_C
 122 # define HOST_WIDEST_INT_PRINT_UNSIGNED       HOST_WIDE_INT_PRINT_UNSIGNED
 123 # define HOST_WIDEST_INT_PRINT_HEX            HOST_WIDE_INT_PRINT_HEX
 124 # define HOST_WIDEST_INT_PRINT_DOUBLE_HEX     HOST_WIDE_INT_PRINT_DOUBLE_HEX
 125 #else
 126 # if HOST_BITS_PER_LONGLONG >= 64
 127 #  define HOST_BITS_PER_WIDEST_INT            HOST_BITS_PER_LONGLONG
 128 #  define HOST_WIDEST_INT                     long long
 129 # else
 130 #  if HOST_BITS_PER___INT64 >= 64
 131 #   define HOST_BITS_PER_WIDEST_INT           HOST_BITS_PER___INT64
 132 #   define HOST_WIDEST_INT                    __int64
 133 #  else
 134     #error "This line should be impossible to reach"
 135 #  endif
 136 # endif
 137 # define HOST_WIDEST_INT_PRINT                HOST_LONG_LONG_FORMAT
 138 # define HOST_WIDEST_INT_PRINT_DEC            "%" HOST_LONG_LONG_FORMAT "d"
 139 # define HOST_WIDEST_INT_PRINT_DEC_C          "%" HOST_LONG_LONG_FORMAT "dLL"
 140 # define HOST_WIDEST_INT_PRINT_UNSIGNED       "%" HOST_LONG_LONG_FORMAT "u"
 141 # define HOST_WIDEST_INT_PRINT_HEX            "%#" HOST_LONG_LONG_FORMAT "x"
 142 # define HOST_WIDEST_INT_PRINT_DOUBLE_HEX     \
 143     "0x%" HOST_LONG_LONG_FORMAT "x%016" HOST_LONG_LONG_FORMAT "x"
 144 #endif
 145
 146 /* Define HOST_WIDEST_FAST_INT to the widest integer type supported
 147    efficiently in hardware.  (That is, the widest integer type that fits
 148    in a hardware register.)  Normally this is "long" but on some hosts it
 149    should be "long long" or "__int64".  This is no convenient way to
 150    autodetect this, so such systems must set a flag in config.host; see there
 151    for details.  */
 152
 153 #ifdef USE_LONG_LONG_FOR_WIDEST_FAST_INT
 154 #  ifdef HAVE_LONG_LONG
 155 #    define HOST_WIDEST_FAST_INT long long
 156 #    define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONGLONG
 157 #  elif defined (HAVE___INT64)
 158 #    define HOST_WIDEST_FAST_INT __int64
 159 #    define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER___INT64
 160 #  else
 161 #    error "Your host said it wanted to use long long or __int64 but neither"
 162 #    error "exist"
 163 #  endif
 164 #else
 165 #  define HOST_WIDEST_FAST_INT long
 166 #  define HOST_BITS_PER_WIDEST_FAST_INT HOST_BITS_PER_LONG
 167 #endif
 168
 169 /* Inline functions operating on HOST_WIDE_INT.  */
 170 #if GCC_VERSION < 3004
 171
 172 extern int clz_hwi (unsigned HOST_WIDE_INT x);
 173 extern int ctz_hwi (unsigned HOST_WIDE_INT x);
 174 extern int ffs_hwi (unsigned HOST_WIDE_INT x);
 175
 176 /* Return log2, or -1 if not exact.  */
 177 extern int exact_log2                  (unsigned HOST_WIDE_INT);
 178
 179 /* Return floor of log2, with -1 for zero.  */
 180 extern int floor_log2                  (unsigned HOST_WIDE_INT);
 181
 182 #else /* GCC_VERSION >= 3004 */
 183
 184 /* For convenience, define 0 -> word_size.  */
 185 static inline int
 186 clz_hwi (unsigned HOST_WIDE_INT x)
 187 {
 188   if (x == 0)
 189     return HOST_BITS_PER_WIDE_INT;
 190 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 191   return __builtin_clzl (x);
 192 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 193   return __builtin_clzll (x);
 194 # else
 195   return __builtin_clz (x);
 196 # endif
 197 }
 198
 199 static inline int
 200 ctz_hwi (unsigned HOST_WIDE_INT x)
 201 {
 202   if (x == 0)
 203     return HOST_BITS_PER_WIDE_INT;
 204 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 205   return __builtin_ctzl (x);
 206 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 207   return __builtin_ctzll (x);
 208 # else
 209   return __builtin_ctz (x);
 210 # endif
 211 }
 212
 213 static inline int
 214 ffs_hwi (unsigned HOST_WIDE_INT x)
 215 {
 216 # if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG
 217   return __builtin_ffsl (x);
 218 # elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG
 219   return __builtin_ffsll (x);
 220 # else
 221   return __builtin_ffs (x);
 222 # endif
 223 }
 224
 225 static inline int
 226 floor_log2 (unsigned HOST_WIDE_INT x)
 227 {
 228   return HOST_BITS_PER_WIDE_INT - 1 - clz_hwi (x);
 229 }
 230
 231 static inline int
 232 exact_log2 (unsigned HOST_WIDE_INT x)
 233 {
 234   return x == (x & -x) && x ? ctz_hwi (x) : -1;
 235 }
 236
 237 #endif /* GCC_VERSION >= 3004 */
 238
 239 #define HOST_WIDE_INT_MIN (HOST_WIDE_INT) \
 240   ((unsigned HOST_WIDE_INT) 1 << (HOST_BITS_PER_WIDE_INT - 1))
 241 #define HOST_WIDE_INT_MAX (~(HOST_WIDE_INT_MIN))
 242
 243 extern HOST_WIDE_INT abs_hwi (HOST_WIDE_INT);
 244 extern unsigned HOST_WIDE_INT absu_hwi (HOST_WIDE_INT);
 245 extern HOST_WIDE_INT gcd (HOST_WIDE_INT, HOST_WIDE_INT);
 246 extern HOST_WIDE_INT pos_mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 247 extern HOST_WIDE_INT mul_hwi (HOST_WIDE_INT, HOST_WIDE_INT);
 248 extern HOST_WIDE_INT least_common_multiple (HOST_WIDE_INT, HOST_WIDE_INT);
 249
 250 #endif /* ! GCC_HWINT_H */