From 8eede5fd642db2c56a1f5185973815fbd2b0afa4 Mon Sep 17 00:00:00 2001 From: Anton Kling Date: Fri, 27 Oct 2023 16:32:13 +0200 Subject: LibC: Optimize memcpy function Instead of copying byte by byte it now copies in 64, 32, 16, 8 bit chunks. --- userland/libc/string/memcpy.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'userland/libc/string/memcpy.c') diff --git a/userland/libc/string/memcpy.c b/userland/libc/string/memcpy.c index e19dec9..7c86b3a 100644 --- a/userland/libc/string/memcpy.c +++ b/userland/libc/string/memcpy.c @@ -3,6 +3,16 @@ void *memcpy(void *dest, const void *src, uint32_t n) { unsigned char *d = dest; const unsigned char *s = src; + + for (; n >= 8; n -= 8, d += 8, s += 8) + *(uint64_t *)d = *(uint64_t *)s; + + for (; n >= 4; n -= 4, d += 4, s += 4) + *(uint32_t *)d = *(uint32_t *)s; + + for (; n >= 2; n -= 2, d += 2, s += 2) + *(uint16_t *)d = *(uint16_t *)s; + for (; n; n--) *d++ = *s++; return dest; -- cgit v1.2.3