xref: /qemu/include/qemu/int128.h (revision 7cebff0d) 
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_or(Int128 a, Int128 b)
62 {
63     return a | b;
64 }
65 
66 static inline Int128 int128_rshift(Int128 a, int n)
67 {
68     return a >> n;
69 }
70 
71 static inline Int128 int128_lshift(Int128 a, int n)
72 {
73     return a << n;
74 }
75 
76 static inline Int128 int128_add(Int128 a, Int128 b)
77 {
78     return a + b;
79 }
80 
81 static inline Int128 int128_neg(Int128 a)
82 {
83     return -a;
84 }
85 
86 static inline Int128 int128_sub(Int128 a, Int128 b)
87 {
88     return a - b;
89 }
90 
91 static inline bool int128_nonneg(Int128 a)
92 {
93     return a >= 0;
94 }
95 
96 static inline bool int128_eq(Int128 a, Int128 b)
97 {
98     return a == b;
99 }
100 
101 static inline bool int128_ne(Int128 a, Int128 b)
102 {
103     return a != b;
104 }
105 
106 static inline bool int128_ge(Int128 a, Int128 b)
107 {
108     return a >= b;
109 }
110 
111 static inline bool int128_lt(Int128 a, Int128 b)
112 {
113     return a < b;
114 }
115 
116 static inline bool int128_le(Int128 a, Int128 b)
117 {
118     return a <= b;
119 }
120 
121 static inline bool int128_gt(Int128 a, Int128 b)
122 {
123     return a > b;
124 }
125 
126 static inline bool int128_nz(Int128 a)
127 {
128     return a != 0;
129 }
130 
131 static inline Int128 int128_min(Int128 a, Int128 b)
132 {
133     return a < b ? a : b;
134 }
135 
136 static inline Int128 int128_max(Int128 a, Int128 b)
137 {
138     return a > b ? a : b;
139 }
140 
141 static inline void int128_addto(Int128 *a, Int128 b)
142 {
143     *a += b;
144 }
145 
146 static inline void int128_subfrom(Int128 *a, Int128 b)
147 {
148     *a -= b;
149 }
150 
151 static inline Int128 bswap128(Int128 a)
152 {
153     return int128_make128(bswap64(int128_gethi(a)), bswap64(int128_getlo(a)));
154 }
155 
156 #else /* !CONFIG_INT128 */
157 
158 typedef struct Int128 Int128;
159 
160 struct Int128 {
161     uint64_t lo;
162     int64_t hi;
163 };
164 
165 static inline Int128 int128_make64(uint64_t a)
166 {
167     return (Int128) { a, 0 };
168 }
169 
170 static inline Int128 int128_make128(uint64_t lo, uint64_t hi)
171 {
172     return (Int128) { lo, hi };
173 }
174 
175 static inline uint64_t int128_get64(Int128 a)
176 {
177     assert(!a.hi);
178     return a.lo;
179 }
180 
181 static inline uint64_t int128_getlo(Int128 a)
182 {
183     return a.lo;
184 }
185 
186 static inline int64_t int128_gethi(Int128 a)
187 {
188     return a.hi;
189 }
190 
191 static inline Int128 int128_zero(void)
192 {
193     return int128_make64(0);
194 }
195 
196 static inline Int128 int128_one(void)
197 {
198     return int128_make64(1);
199 }
200 
201 static inline Int128 int128_2_64(void)
202 {
203     return (Int128) { 0, 1 };
204 }
205 
206 static inline Int128 int128_exts64(int64_t a)
207 {
208     return (Int128) { .lo = a, .hi = (a < 0) ? -1 : 0 };
209 }
210 
211 static inline Int128 int128_and(Int128 a, Int128 b)
212 {
213     return (Int128) { a.lo & b.lo, a.hi & b.hi };
214 }
215 
216 static inline Int128 int128_or(Int128 a, Int128 b)
217 {
218     return (Int128) { a.lo | b.lo, a.hi | b.hi };
219 }
220 
221 static inline Int128 int128_rshift(Int128 a, int n)
222 {
223     int64_t h;
224     if (!n) {
225         return a;
226     }
227     h = a.hi >> (n & 63);
228     if (n >= 64) {
229         return int128_make128(h, h >> 63);
230     } else {
231         return int128_make128((a.lo >> n) | ((uint64_t)a.hi << (64 - n)), h);
232     }
233 }
234 
235 static inline Int128 int128_lshift(Int128 a, int n)
236 {
237     uint64_t l = a.lo << (n & 63);
238     if (n >= 64) {
239         return int128_make128(0, l);
240     } else if (n > 0) {
241         return int128_make128(l, (a.hi << n) | (a.lo >> (64 - n)));
242     }
243     return a;
244 }
245 
246 static inline Int128 int128_add(Int128 a, Int128 b)
247 {
248     uint64_t lo = a.lo + b.lo;
249 
250     /* a.lo <= a.lo + b.lo < a.lo + k (k is the base, 2^64).  Hence,
251      * a.lo + b.lo >= k implies 0 <= lo = a.lo + b.lo - k < a.lo.
252      * Similarly, a.lo + b.lo < k implies a.lo <= lo = a.lo + b.lo < k.
253      *
254      * So the carry is lo < a.lo.
255      */
256     return int128_make128(lo, (uint64_t)a.hi + b.hi + (lo < a.lo));
257 }
258 
259 static inline Int128 int128_neg(Int128 a)
260 {
261     uint64_t lo = -a.lo;
262     return int128_make128(lo, ~(uint64_t)a.hi + !lo);
263 }
264 
265 static inline Int128 int128_sub(Int128 a, Int128 b)
266 {
267     return int128_make128(a.lo - b.lo, (uint64_t)a.hi - b.hi - (a.lo < b.lo));
268 }
269 
270 static inline bool int128_nonneg(Int128 a)
271 {
272     return a.hi >= 0;
273 }
274 
275 static inline bool int128_eq(Int128 a, Int128 b)
276 {
277     return a.lo == b.lo && a.hi == b.hi;
278 }
279 
280 static inline bool int128_ne(Int128 a, Int128 b)
281 {
282     return !int128_eq(a, b);
283 }
284 
285 static inline bool int128_ge(Int128 a, Int128 b)
286 {
287     return a.hi > b.hi || (a.hi == b.hi && a.lo >= b.lo);
288 }
289 
290 static inline bool int128_lt(Int128 a, Int128 b)
291 {
292     return !int128_ge(a, b);
293 }
294 
295 static inline bool int128_le(Int128 a, Int128 b)
296 {
297     return int128_ge(b, a);
298 }
299 
300 static inline bool int128_gt(Int128 a, Int128 b)
301 {
302     return !int128_le(a, b);
303 }
304 
305 static inline bool int128_nz(Int128 a)
306 {
307     return a.lo || a.hi;
308 }
309 
310 static inline Int128 int128_min(Int128 a, Int128 b)
311 {
312     return int128_le(a, b) ? a : b;
313 }
314 
315 static inline Int128 int128_max(Int128 a, Int128 b)
316 {
317     return int128_ge(a, b) ? a : b;
318 }
319 
320 static inline void int128_addto(Int128 *a, Int128 b)
321 {
322     *a = int128_add(*a, b);
323 }
324 
325 static inline void int128_subfrom(Int128 *a, Int128 b)
326 {
327     *a = int128_sub(*a, b);
328 }
329 
330 #endif /* CONFIG_INT128 */
331 #endif /* INT128_H */
332