| 27 | #define RS << |
| 28 | |
| 29 | void *memcpy(void *restrict dest, const void *restrict src, size_t n) |
| 30 | { |
| 31 | unsigned char *d = dest; |
| 32 | const unsigned char *s = src; |
| 33 | |
| 34 | typedef uint32_t __attribute__((__may_alias__)) u32; |
| 35 | uint32_t w, x; |
| 36 | |
| 37 | for (; (uintptr_t)s % 4 && n; n--) *d++ = *s++; |
| 38 | |
| 39 | if ((uintptr_t)d % 4 == 0) { |
| 40 | for (; n>=16; s+=16, d+=16, n-=16) { |
| 41 | *(u32 *)(d+0) = *(u32 *)(s+0); |
| 42 | *(u32 *)(d+4) = *(u32 *)(s+4); |
| 43 | *(u32 *)(d+8) = *(u32 *)(s+8); |
| 44 | *(u32 *)(d+12) = *(u32 *)(s+12); |
| 45 | } |
| 46 | if (n&8) { |
| 47 | *(u32 *)(d+0) = *(u32 *)(s+0); |
| 48 | *(u32 *)(d+4) = *(u32 *)(s+4); |
| 49 | d += 8; s += 8; |
| 50 | } |
| 51 | if (n&4) { |
| 52 | *(u32 *)(d+0) = *(u32 *)(s+0); |
| 53 | d += 4; s += 4; |
| 54 | } |
| 55 | if (n&2) { |
| 56 | *d++ = *s++; *d++ = *s++; |
| 57 | } |
| 58 | if (n&1) { |
| 59 | *d = *s; |
| 60 | } |
| 61 | return dest; |
| 62 | } |
| 63 | |
| 64 | if (n >= 32) switch ((uintptr_t)d % 4) { |
| 65 | case 1: |
| 66 | w = *(u32 *)s; |
| 67 | *d++ = *s++; |
| 68 | *d++ = *s++; |
| 69 | *d++ = *s++; |
| 70 | n -= 3; |
| 71 | for (; n>=17; s+=16, d+=16, n-=16) { |
| 72 | x = *(u32 *)(s+1); |
| 73 | *(u32 *)(d+0) = (w LS 24) | (x RS 8); |
| 74 | w = *(u32 *)(s+5); |
| 75 | *(u32 *)(d+4) = (x LS 24) | (w RS 8); |
| 76 | x = *(u32 *)(s+9); |
| 77 | *(u32 *)(d+8) = (w LS 24) | (x RS 8); |
| 78 | w = *(u32 *)(s+13); |
| 79 | *(u32 *)(d+12) = (x LS 24) | (w RS 8); |
| 80 | } |
| 81 | break; |
| 82 | case 2: |
| 83 | w = *(u32 *)s; |
| 84 | *d++ = *s++; |
| 85 | *d++ = *s++; |
| 86 | n -= 2; |
no outgoing calls
no test coverage detected