include/qemu/int128.h

   1 #ifndef INT128_H
   2 #define INT128_H
   3
   4 #ifdef CONFIG_INT128
   5 #include "qemu/bswap.h"
   6
   7 typedef __int128_t Int128;
   8
   9 static inline Int128 int128_make64(uint64_t a)
  10 {
  11     return a;
  12 }
  13
  14 static inline Int128 int128_make128(uint64_t lo, uint64_t hi)
  15 {
  16     return (__uint128_t)hi << 64 | lo;
  17 }
  18
  19 static inline uint64_t int128_get64(Int128 a)
  20 {
  21     uint64_t r = a;
  22     assert(r == a);
  23     return r;
  24 }
  25
  26 static inline uint64_t int128_getlo(Int128 a)
  27 {
  28     return a;
  29 }
  30
  31 static inline int64_t int128_gethi(Int128 a)
  32 {
  33     return a >> 64;
  34 }
  35
  36 static inline Int128 int128_zero(void)
  37 {
  38     return 0;
  39 }
  40
  41 static inline Int128 int128_one(void)
  42 {
  43     return 1;
  44 }
  45
  46 static inline Int128 int128_2_64(void)
  47 {
  48     return (Int128)1 << 64;
  49 }
  50
  51 static inline Int128 int128_exts64(int64_t a)
  52 {
  53     return a;
  54 }
  55
  56 static inline Int128 int128_and(Int128 a, Int128 b)
  57 {
  58     return a & b;
  59 }
  60
  61 static inline Int128 int128_rshift(Int128 a, int n)
  62 {
  63     return a >> n;
  64 }
  65
  66 static inline Int128 int128_add(Int128 a, Int128 b)
  67 {
  68     return a + b;
  69 }
  70
  71 static inline Int128 int128_neg(Int128 a)
  72 {
  73     return -a;
  74 }
  75
  76 static inline Int128 int128_sub(Int128 a, Int128 b)
  77 {
  78     return a - b;
  79 }
  80
  81 static inline bool int128_nonneg(Int128 a)
  82 {
  83     return a >= 0;
  84 }
  85
  86 static inline bool int128_eq(Int128 a, Int128 b)
  87 {
  88     return a == b;
  89 }
  90
  91 static inline bool int128_ne(Int128 a, Int128 b)
  92 {
  93     return a != b;
  94 }
  95
  96 static inline bool int128_ge(Int128 a, Int128 b)
  97 {
  98     return a >= b;
  99 }
 100
 101 static inline bool int128_lt(Int128 a, Int128 b)
 102 {
 103     return a < b;
 104 }
 105
 106 static inline bool int128_le(Int128 a, Int128 b)
 107 {
 108     return a <= b;
 109 }
 110
 111 static inline bool int128_gt(Int128 a, Int128 b)
 112 {
 113     return a > b;
 114 }
 115
 116 static inline bool int128_nz(Int128 a)
 117 {
 118     return a != 0;
 119 }
 120
 121 static inline Int128 int128_min(Int128 a, Int128 b)
 122 {
 123     return a < b ? a : b;
 124 }
 125
 126 static inline Int128 int128_max(Int128 a, Int128 b)
 127 {
 128     return a > b ? a : b;
 129 }
 130
 131 static inline void int128_addto(Int128 *a, Int128 b)
 132 {
 133     *a += b;
 134 }
 135
 136 static inline void int128_subfrom(Int128 *a, Int128 b)
 137 {
 138     *a -= b;
 139 }
 140
 141 static inline Int128 bswap128(Int128 a)
 142 {
 143     return int128_make128(bswap64(int128_gethi(a)), bswap64(int128_getlo(a)));
 144 }
 145
 146 #else /* !CONFIG_INT128 */
 147
 148 typedef struct Int128 Int128;
 149
 150 struct Int128 {
 151     uint64_t lo;
 152     int64_t hi;
 153 };
 154
 155 static inline Int128 int128_make64(uint64_t a)
 156 {
 157     return (Int128) { a, 0 };
 158 }
 159
 160 static inline Int128 int128_make128(uint64_t lo, uint64_t hi)
 161 {
 162     return (Int128) { lo, hi };
 163 }
 164
 165 static inline uint64_t int128_get64(Int128 a)
 166 {
 167     assert(!a.hi);
 168     return a.lo;
 169 }
 170
 171 static inline uint64_t int128_getlo(Int128 a)
 172 {
 173     return a.lo;
 174 }
 175
 176 static inline int64_t int128_gethi(Int128 a)
 177 {
 178     return a.hi;
 179 }
 180
 181 static inline Int128 int128_zero(void)
 182 {
 183     return int128_make64(0);
 184 }
 185
 186 static inline Int128 int128_one(void)
 187 {
 188     return int128_make64(1);
 189 }
 190
 191 static inline Int128 int128_2_64(void)
 192 {
 193     return (Int128) { 0, 1 };
 194 }
 195
 196 static inline Int128 int128_exts64(int64_t a)
 197 {
 198     return (Int128) { .lo = a, .hi = (a < 0) ? -1 : 0 };
 199 }
 200
 201 static inline Int128 int128_and(Int128 a, Int128 b)
 202 {
 203     return (Int128) { a.lo & b.lo, a.hi & b.hi };
 204 }
 205
 206 static inline Int128 int128_rshift(Int128 a, int n)
 207 {
 208     int64_t h;
 209     if (!n) {
 210         return a;
 211     }
 212     h = a.hi >> (n & 63);
 213     if (n >= 64) {
 214         return int128_make128(h, h >> 63);
 215     } else {
 216         return int128_make128((a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h);
 217     }
 218 }
 219
 220 static inline Int128 int128_add(Int128 a, Int128 b)
 221 {
 222     uint64_t lo = a.lo + b.lo;
 223
 224     /* a.lo <= a.lo + b.lo < a.lo + k (k is the base, 2^64).  Hence,
 225      * a.lo + b.lo >= k implies 0 <= lo = a.lo + b.lo - k < a.lo.
 226      * Similarly, a.lo + b.lo < k implies a.lo <= lo = a.lo + b.lo < k.
 227      *
 228      * So the carry is lo < a.lo.
 229      */
 230     return int128_make128(lo, (uint64_t)a.hi + b.hi + (lo < a.lo));
 231 }
 232
 233 static inline Int128 int128_neg(Int128 a)
 234 {
 235     uint64_t lo = -a.lo;
 236     return int128_make128(lo, ~(uint64_t)a.hi + !lo);
 237 }
 238
 239 static inline Int128 int128_sub(Int128 a, Int128 b)
 240 {
 241     return int128_make128(a.lo - b.lo, (uint64_t)a.hi - b.hi - (a.lo < b.lo));
 242 }
 243
 244 static inline bool int128_nonneg(Int128 a)
 245 {
 246     return a.hi >= 0;
 247 }
 248
 249 static inline bool int128_eq(Int128 a, Int128 b)
 250 {
 251     return a.lo == b.lo && a.hi == b.hi;
 252 }
 253
 254 static inline bool int128_ne(Int128 a, Int128 b)
 255 {
 256     return !int128_eq(a, b);
 257 }
 258
 259 static inline bool int128_ge(Int128 a, Int128 b)
 260 {
 261     return a.hi > b.hi || (a.hi == b.hi && a.lo >= b.lo);
 262 }
 263
 264 static inline bool int128_lt(Int128 a, Int128 b)
 265 {
 266     return !int128_ge(a, b);
 267 }
 268
 269 static inline bool int128_le(Int128 a, Int128 b)
 270 {
 271     return int128_ge(b, a);
 272 }
 273
 274 static inline bool int128_gt(Int128 a, Int128 b)
 275 {
 276     return !int128_le(a, b);
 277 }
 278
 279 static inline bool int128_nz(Int128 a)
 280 {
 281     return a.lo || a.hi;
 282 }
 283
 284 static inline Int128 int128_min(Int128 a, Int128 b)
 285 {
 286     return int128_le(a, b) ? a : b;
 287 }
 288
 289 static inline Int128 int128_max(Int128 a, Int128 b)
 290 {
 291     return int128_ge(a, b) ? a : b;
 292 }
 293
 294 static inline void int128_addto(Int128 *a, Int128 b)
 295 {
 296     *a = int128_add(*a, b);
 297 }
 298
 299 static inline void int128_subfrom(Int128 *a, Int128 b)
 300 {
 301     *a = int128_sub(*a, b);
 302 }
 303
 304 #endif /* CONFIG_INT128 */
 305 #endif /* INT128_H */