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This commit is contained in:
Justine Tunney 2021-10-04 03:23:31 -07:00
parent 7521bf9e73
commit 725f4d79f6
36 changed files with 682 additions and 334 deletions
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24
libc/intrin/memmove.c
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@ -97,7 +97,29 @@ void *memmove(void *dst, const void *src, size_t n) {
d = dst;
s = src;
if (IsTiny()) {
if (d <= s) {
uint16_t w1, w2;
uint32_t l1, l2;
uint64_t q1, q2;
if (n <= 16) {
if (n >= 8) {
__builtin_memcpy(&q1, s, 8);
__builtin_memcpy(&q2, s + n - 8, 8);
__builtin_memcpy(d, &q1, 8);
__builtin_memcpy(d + n - 8, &q2, 8);
} else if (n >= 4) {
__builtin_memcpy(&l1, s, 4);
__builtin_memcpy(&l2, s + n - 4, 4);
__builtin_memcpy(d, &l1, 4);
__builtin_memcpy(d + n - 4, &l2, 4);
} else if (n >= 2) {
__builtin_memcpy(&w1, s, 2);
__builtin_memcpy(&w2, s + n - 2, 2);
__builtin_memcpy(d, &w1, 2);
__builtin_memcpy(d + n - 2, &w2, 2);
} else if (n) {
*d = *s;
}
} else if (d <= s) {
asm("rep movsb"
: "+D"(d), "+S"(s), "+c"(n), "=m"(*(char(*)[n])dst)
: "m"(*(char(*)[n])src));