root/lib/u64.h

INCLUDED FROM

DEFINITIONS

1. u64hilo
2. u64lo
3. u64size
4. u64lt
5. u64and
6. u64or
7. u64xor
8. u64plus
9. u64shl
10. u64shr

     1 /* uint64_t-like operations that work even on hosts lacking uint64_t
     2 
     3    Copyright (C) 2006, 2009-2023 Free Software Foundation, Inc.
     4 
     5    This file is free software: you can redistribute it and/or modify
     6    it under the terms of the GNU Lesser General Public License as
     7    published by the Free Software Foundation; either version 2.1 of the
     8    License, or (at your option) any later version.
     9 
    10    This file is distributed in the hope that it will be useful,
    11    but WITHOUT ANY WARRANTY; without even the implied warranty of
    12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    13    GNU Lesser General Public License for more details.
    14 
    15    You should have received a copy of the GNU Lesser General Public License
    16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
    17 
    18 /* Written by Paul Eggert.  */
    19 
    20 /* This file uses _GL_INLINE_HEADER_BEGIN, _GL_INLINE.  */
    21 #if !_GL_CONFIG_H_INCLUDED
    22  #error "Please include config.h first."
    23 #endif
    24 
    25 #include <stdint.h>
    26 
    27 _GL_INLINE_HEADER_BEGIN
    28 #ifndef _GL_U64_INLINE
    29 # define _GL_U64_INLINE _GL_INLINE
    30 #endif
    31 
    32 /* Return X rotated left by N bits, where 0 < N < 64.  */
    33 #define u64rol(x, n) u64or (u64shl (x, n), u64shr (x, 64 - n))
    34 
    35 #ifdef UINT64_MAX
    36 
    37 /* Native implementations are trivial.  See below for comments on what
    38    these operations do.  */
    39 typedef uint64_t u64;
    40 # define u64hilo(hi, lo) ((u64) (((u64) (hi) << 32) + (lo)))
    41 # define u64init(hi, lo) u64hilo (hi, lo)
    42 # define u64lo(x) ((u64) (x))
    43 # define u64size(x) u64lo (x)
    44 # define u64lt(x, y) ((x) < (y))
    45 # define u64and(x, y) ((x) & (y))
    46 # define u64or(x, y) ((x) | (y))
    47 # define u64xor(x, y) ((x) ^ (y))
    48 # define u64plus(x, y) ((x) + (y))
    49 # define u64shl(x, n) ((x) << (n))
    50 # define u64shr(x, n) ((x) >> (n))
    51 
    52 #else
    53 
    54 /* u64 is a 64-bit unsigned integer value.
    55    u64init (HI, LO), is like u64hilo (HI, LO), but for use in
    56    initializer contexts.  */
    57 # ifdef WORDS_BIGENDIAN
    58 typedef struct { uint32_t hi, lo; } u64;
    59 #  define u64init(hi, lo) { hi, lo }
    60 # else
    61 typedef struct { uint32_t lo, hi; } u64;
    62 #  define u64init(hi, lo) { lo, hi }
    63 # endif
    64 
    65 /* Given the high and low-order 32-bit quantities HI and LO, return a u64
    66    value representing (HI << 32) + LO.  */
    67 _GL_U64_INLINE u64
    68 u64hilo (uint32_t hi, uint32_t lo)
    69 {
    70   u64 r;
    71   r.hi = hi;
    72   r.lo = lo;
    73   return r;
    74 }
    75 
    76 /* Return a u64 value representing LO.  */
    77 _GL_U64_INLINE u64
    78 u64lo (uint32_t lo)
    79 {
    80   u64 r;
    81   r.hi = 0;
    82   r.lo = lo;
    83   return r;
    84 }
    85 
    86 /* Return a u64 value representing SIZE.  */
    87 _GL_U64_INLINE u64
    88 u64size (size_t size)
    89 {
    90   u64 r;
    91   r.hi = size >> 31 >> 1;
    92   r.lo = size;
    93   return r;
    94 }
    95 
    96 /* Return X < Y.  */
    97 _GL_U64_INLINE int
    98 u64lt (u64 x, u64 y)
    99 {
   100   return x.hi < y.hi || (x.hi == y.hi && x.lo < y.lo);
   101 }
   102 
   103 /* Return X & Y.  */
   104 _GL_U64_INLINE u64
   105 u64and (u64 x, u64 y)
   106 {
   107   u64 r;
   108   r.hi = x.hi & y.hi;
   109   r.lo = x.lo & y.lo;
   110   return r;
   111 }
   112 
   113 /* Return X | Y.  */
   114 _GL_U64_INLINE u64
   115 u64or (u64 x, u64 y)
   116 {
   117   u64 r;
   118   r.hi = x.hi | y.hi;
   119   r.lo = x.lo | y.lo;
   120   return r;
   121 }
   122 
   123 /* Return X ^ Y.  */
   124 _GL_U64_INLINE u64
   125 u64xor (u64 x, u64 y)
   126 {
   127   u64 r;
   128   r.hi = x.hi ^ y.hi;
   129   r.lo = x.lo ^ y.lo;
   130   return r;
   131 }
   132 
   133 /* Return X + Y.  */
   134 _GL_U64_INLINE u64
   135 u64plus (u64 x, u64 y)
   136 {
   137   u64 r;
   138   r.lo = x.lo + y.lo;
   139   r.hi = x.hi + y.hi + (r.lo < x.lo);
   140   return r;
   141 }
   142 
   143 /* Return X << N.  */
   144 _GL_U64_INLINE u64
   145 u64shl (u64 x, int n)
   146 {
   147   u64 r;
   148   if (n < 32)
   149     {
   150       r.hi = (x.hi << n) | (x.lo >> (32 - n));
   151       r.lo = x.lo << n;
   152     }
   153   else
   154     {
   155       r.hi = x.lo << (n - 32);
   156       r.lo = 0;
   157     }
   158   return r;
   159 }
   160 
   161 /* Return X >> N.  */
   162 _GL_U64_INLINE u64
   163 u64shr (u64 x, int n)
   164 {
   165   u64 r;
   166   if (n < 32)
   167     {
   168       r.hi = x.hi >> n;
   169       r.lo = (x.hi << (32 - n)) | (x.lo >> n);
   170     }
   171   else
   172     {
   173       r.hi = 0;
   174       r.lo = x.hi >> (n - 32);
   175     }
   176   return r;
   177 }
   178 
   179 #endif
   180 
   181 _GL_INLINE_HEADER_END