aboutsummaryrefslogtreecommitdiff
path: root/include/qemu/int128.h
blob: 73624e8be7c47abf410516734d9e1c83e96525e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
#ifndef INT128_H
#define INT128_H

#include "qemu/bswap.h"

/*
 * With TCI, we need to use libffi for interfacing with TCG helpers.
 * But libffi does not support __int128_t, and therefore cannot pass
 * or return values of this type, force use of the Int128 struct.
 */
#if defined(CONFIG_INT128) && !defined(CONFIG_TCG_INTERPRETER)
typedef __int128_t Int128;

static inline Int128 int128_make64(uint64_t a)
{
    return a;
}

static inline Int128 int128_makes64(int64_t a)
{
    return a;
}

static inline Int128 int128_make128(uint64_t lo, uint64_t hi)
{
    return (__uint128_t)hi << 64 | lo;
}

static inline uint64_t int128_get64(Int128 a)
{
    uint64_t r = a;
    assert(r == a);
    return r;
}

static inline uint64_t int128_getlo(Int128 a)
{
    return a;
}

static inline int64_t int128_gethi(Int128 a)
{
    return a >> 64;
}

static inline Int128 int128_zero(void)
{
    return 0;
}

static inline Int128 int128_one(void)
{
    return 1;
}

static inline Int128 int128_2_64(void)
{
    return (Int128)1 << 64;
}

static inline Int128 int128_exts64(int64_t a)
{
    return a;
}

static inline Int128 int128_not(Int128 a)
{
    return ~a;
}

static inline Int128 int128_and(Int128 a, Int128 b)
{
    return a & b;
}

static inline Int128 int128_or(Int128 a, Int128 b)
{
    return a | b;
}

static inline Int128 int128_xor(Int128 a, Int128 b)
{
    return a ^ b;
}

static inline Int128 int128_rshift(Int128 a, int n)
{
    return a >> n;
}

static inline Int128 int128_urshift(Int128 a, int n)
{
    return (__uint128_t)a >> n;
}

static inline Int128 int128_lshift(Int128 a, int n)
{
    return a << n;
}

static inline Int128 int128_add(Int128 a, Int128 b)
{
    return a + b;
}

static inline Int128 int128_neg(Int128 a)
{
    return -a;
}

static inline Int128 int128_sub(Int128 a, Int128 b)
{
    return a - b;
}

static inline bool int128_nonneg(Int128 a)
{
    return a >= 0;
}

static inline bool int128_eq(Int128 a, Int128 b)
{
    return a == b;
}

static inline bool int128_ne(Int128 a, Int128 b)
{
    return a != b;
}

static inline bool int128_ge(Int128 a, Int128 b)
{
    return a >= b;
}

static inline bool int128_uge(Int128 a, Int128 b)
{
    return ((__uint128_t)a) >= ((__uint128_t)b);
}

static inline bool int128_lt(Int128 a, Int128 b)
{
    return a < b;
}

static inline bool int128_ult(Int128 a, Int128 b)
{
    return (__uint128_t)a < (__uint128_t)b;
}

static inline bool int128_le(Int128 a, Int128 b)
{
    return a <= b;
}

static inline bool int128_gt(Int128 a, Int128 b)
{
    return a > b;
}

static inline bool int128_nz(Int128 a)
{
    return a != 0;
}

static inline Int128 int128_min(Int128 a, Int128 b)
{
    return a < b ? a : b;
}

static inline Int128 int128_max(Int128 a, Int128 b)
{
    return a > b ? a : b;
}

static inline void int128_addto(Int128 *a, Int128 b)
{
    *a += b;
}

static inline void int128_subfrom(Int128 *a, Int128 b)
{
    *a -= b;
}

static inline Int128 bswap128(Int128 a)
{
#if __has_builtin(__builtin_bswap128)
    return __builtin_bswap128(a);
#else
    return int128_make128(bswap64(int128_gethi(a)), bswap64(int128_getlo(a)));
#endif
}

static inline int clz128(Int128 a)
{
    if (a >> 64) {
        return __builtin_clzll(a >> 64);
    } else {
        return (a) ? __builtin_clzll((uint64_t)a) + 64 : 128;
    }
}

static inline Int128 int128_divu(Int128 a, Int128 b)
{
    return (__uint128_t)a / (__uint128_t)b;
}

static inline Int128 int128_remu(Int128 a, Int128 b)
{
    return (__uint128_t)a % (__uint128_t)b;
}

static inline Int128 int128_divs(Int128 a, Int128 b)
{
    return a / b;
}

static inline Int128 int128_rems(Int128 a, Int128 b)
{
    return a % b;
}

#else /* !CONFIG_INT128 */

typedef struct Int128 Int128;

/*
 * We guarantee that the in-memory byte representation of an
 * Int128 is that of a host-endian-order 128-bit integer
 * (whether using this struct or the __int128_t version of the type).
 * Some code using this type relies on this (eg when copying it into
 * guest memory or a gdb protocol buffer, or by using Int128 in
 * a union with other integer types).
 */
struct Int128 {
#if HOST_BIG_ENDIAN
    int64_t hi;
    uint64_t lo;
#else
    uint64_t lo;
    int64_t hi;
#endif
};

static inline Int128 int128_make64(uint64_t a)
{
    return (Int128) { .lo = a, .hi = 0 };
}

static inline Int128 int128_makes64(int64_t a)
{
    return (Int128) { .lo = a, .hi = a >> 63 };
}

static inline Int128 int128_make128(uint64_t lo, uint64_t hi)
{
    return (Int128) { .lo = lo, .hi = hi };
}

static inline uint64_t int128_get64(Int128 a)
{
    assert(!a.hi);
    return a.lo;
}

static inline uint64_t int128_getlo(Int128 a)
{
    return a.lo;
}

static inline int64_t int128_gethi(Int128 a)
{
    return a.hi;
}

static inline Int128 int128_zero(void)
{
    return int128_make64(0);
}

static inline Int128 int128_one(void)
{
    return int128_make64(1);
}

static inline Int128 int128_2_64(void)
{
    return int128_make128(0, 1);
}

static inline Int128 int128_exts64(int64_t a)
{
    return int128_make128(a, (a < 0) ? -1 : 0);
}

static inline Int128 int128_not(Int128 a)
{
    return int128_make128(~a.lo, ~a.hi);
}

static inline Int128 int128_and(Int128 a, Int128 b)
{
    return int128_make128(a.lo & b.lo, a.hi & b.hi);
}

static inline Int128 int128_or(Int128 a, Int128 b)
{
    return int128_make128(a.lo | b.lo, a.hi | b.hi);
}

static inline Int128 int128_xor(Int128 a, Int128 b)
{
    return int128_make128(a.lo ^ b.lo, a.hi ^ b.hi);
}

static inline Int128 int128_rshift(Int128 a, int n)
{
    int64_t h;
    if (!n) {
        return a;
    }
    h = a.hi >> (n & 63);
    if (n >= 64) {
        return int128_make128(h, h >> 63);
    } else {
        return int128_make128((a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h);
    }
}

static inline Int128 int128_urshift(Int128 a, int n)
{
    uint64_t h = a.hi;
    if (!n) {
        return a;
    }
    h = h >> (n & 63);
    if (n >= 64) {
        return int128_make64(h);
    } else {
        return int128_make128((a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h);
    }
}

static inline Int128 int128_lshift(Int128 a, int n)
{
    uint64_t l = a.lo << (n & 63);
    if (n >= 64) {
        return int128_make128(0, l);
    } else if (n > 0) {
        return int128_make128(l, (a.hi << n) | (a.lo >> (64 - n)));
    }
    return a;
}

static inline Int128 int128_add(Int128 a, Int128 b)
{
    uint64_t lo = a.lo + b.lo;

    /* a.lo <= a.lo + b.lo < a.lo + k (k is the base, 2^64).  Hence,
     * a.lo + b.lo >= k implies 0 <= lo = a.lo + b.lo - k < a.lo.
     * Similarly, a.lo + b.lo < k implies a.lo <= lo = a.lo + b.lo < k.
     *
     * So the carry is lo < a.lo.
     */
    return int128_make128(lo, (uint64_t)a.hi + b.hi + (lo < a.lo));
}

static inline Int128 int128_neg(Int128 a)
{
    uint64_t lo = -a.lo;
    return int128_make128(lo, ~(uint64_t)a.hi + !lo);
}

static inline Int128 int128_sub(Int128 a, Int128 b)
{
    return int128_make128(a.lo - b.lo, (uint64_t)a.hi - b.hi - (a.lo < b.lo));
}

static inline bool int128_nonneg(Int128 a)
{
    return a.hi >= 0;
}

static inline bool int128_eq(Int128 a, Int128 b)
{
    return a.lo == b.lo && a.hi == b.hi;
}

static inline bool int128_ne(Int128 a, Int128 b)
{
    return !int128_eq(a, b);
}

static inline bool int128_ge(Int128 a, Int128 b)
{
    return a.hi > b.hi || (a.hi == b.hi && a.lo >= b.lo);
}

static inline bool int128_uge(Int128 a, Int128 b)
{
    return (uint64_t)a.hi > (uint64_t)b.hi || (a.hi == b.hi && a.lo >= b.lo);
}

static inline bool int128_lt(Int128 a, Int128 b)
{
    return !int128_ge(a, b);
}

static inline bool int128_ult(Int128 a, Int128 b)
{
    return !int128_uge(a, b);
}

static inline bool int128_le(Int128 a, Int128 b)
{
    return int128_ge(b, a);
}

static inline bool int128_gt(Int128 a, Int128 b)
{
    return !int128_le(a, b);
}

static inline bool int128_nz(Int128 a)
{
    return a.lo || a.hi;
}

static inline Int128 int128_min(Int128 a, Int128 b)
{
    return int128_le(a, b) ? a : b;
}

static inline Int128 int128_max(Int128 a, Int128 b)
{
    return int128_ge(a, b) ? a : b;
}

static inline void int128_addto(Int128 *a, Int128 b)
{
    *a = int128_add(*a, b);
}

static inline void int128_subfrom(Int128 *a, Int128 b)
{
    *a = int128_sub(*a, b);
}

static inline Int128 bswap128(Int128 a)
{
    return int128_make128(bswap64(a.hi), bswap64(a.lo));
}

static inline int clz128(Int128 a)
{
    if (a.hi) {
        return __builtin_clzll(a.hi);
    } else {
        return (a.lo) ? __builtin_clzll(a.lo) + 64 : 128;
    }
}

Int128 int128_divu(Int128, Int128);
Int128 int128_remu(Int128, Int128);
Int128 int128_divs(Int128, Int128);
Int128 int128_rems(Int128, Int128);
#endif /* CONFIG_INT128 && !CONFIG_TCG_INTERPRETER */

static inline void bswap128s(Int128 *s)
{
    *s = bswap128(*s);
}

#define UINT128_MAX int128_make128(~0LL, ~0LL)
#define INT128_MAX int128_make128(UINT64_MAX, INT64_MAX)
#define INT128_MIN int128_make128(0, INT64_MIN)

/*
 * When compiler supports a 128-bit type, define a combination of
 * a possible structure and the native types.  Ease parameter passing
 * via use of the transparent union extension.
 */
#ifdef CONFIG_INT128_TYPE
typedef union {
    __uint128_t u;
    __int128_t i;
    Int128 s;
} Int128Alias __attribute__((transparent_union));
#else
typedef Int128 Int128Alias;
#endif /* CONFIG_INT128_TYPE */

#endif /* INT128_H */