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320054e8 DG |
1 | #include <string.h> |
2 | #include <stdint.h> | |
3 | ||
4 | #ifdef __GNUC__ | |
5 | typedef __attribute__((__may_alias__)) size_t WT; | |
6 | #define WS (sizeof(WT)) | |
7 | #endif | |
8 | ||
9 | void *memmove(void *dest, const void *src, size_t n) | |
10 | { | |
75fdabe1 CS |
11 | #if defined(__wasm_bulk_memory__) |
12 | return __builtin_memmove(dest, src, n); | |
13 | #else | |
320054e8 DG |
14 | char *d = dest; |
15 | const char *s = src; | |
16 | ||
17 | if (d==s) return d; | |
18 | if ((uintptr_t)s-(uintptr_t)d-n <= -2*n) return memcpy(d, s, n); | |
19 | ||
20 | if (d<s) { | |
21 | #ifdef __GNUC__ | |
22 | if ((uintptr_t)s % WS == (uintptr_t)d % WS) { | |
23 | while ((uintptr_t)d % WS) { | |
24 | if (!n--) return dest; | |
25 | *d++ = *s++; | |
26 | } | |
27 | for (; n>=WS; n-=WS, d+=WS, s+=WS) *(WT *)d = *(WT *)s; | |
28 | } | |
29 | #endif | |
30 | for (; n; n--) *d++ = *s++; | |
31 | } else { | |
32 | #ifdef __GNUC__ | |
33 | if ((uintptr_t)s % WS == (uintptr_t)d % WS) { | |
34 | while ((uintptr_t)(d+n) % WS) { | |
35 | if (!n--) return dest; | |
36 | d[n] = s[n]; | |
37 | } | |
38 | while (n>=WS) n-=WS, *(WT *)(d+n) = *(WT *)(s+n); | |
39 | } | |
40 | #endif | |
41 | while (n) n--, d[n] = s[n]; | |
42 | } | |
43 | ||
44 | return dest; | |
75fdabe1 | 45 | #endif // __wasm_bulk_memory__ |
320054e8 | 46 | } |