xref: /qemu/include/qemu/int128.h (revision b30d1886) 
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 */
306