diff options
Diffstat (limited to 'libc/string/powerpc/memcpy.c')
| -rw-r--r-- | libc/string/powerpc/memcpy.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/libc/string/powerpc/memcpy.c b/libc/string/powerpc/memcpy.c index f3d800739..22794ec33 100644 --- a/libc/string/powerpc/memcpy.c +++ b/libc/string/powerpc/memcpy.c @@ -21,16 +21,15 @@ #include <string.h> -/* Experimentally off - libc_hidden_proto(memcpy) */ -void *memcpy(void *to, const void *from, size_t n) -/* PPC can do pre increment and load/store, but not post increment and load/store. - Therefore use *++ptr instead of *ptr++. */ +/* PPC can do pre increment and load/store, but not post increment and + load/store. Therefore use *++ptr instead of *ptr++. */ +void *memcpy(void *to, const void *from, size_t len) { unsigned long rem, chunks, tmp1, tmp2; unsigned char *tmp_to; unsigned char *tmp_from = (unsigned char *)from; - chunks = n / 8; + chunks = len / 8; tmp_from -= 4; tmp_to = to - 4; if (!chunks) @@ -49,30 +48,33 @@ void *memcpy(void *to, const void *from, size_t n) *(unsigned long *)tmp_to = tmp2; } while (--chunks); lessthan8: - n = n % 8; - if (n >= 4) { - *(unsigned long *)(tmp_to+4) = *(unsigned long *)(tmp_from+4); + len = len % 8; + if (len >= 4) { tmp_from += 4; tmp_to += 4; - n = n-4; + *(unsigned long *)(tmp_to) = *(unsigned long *)(tmp_from); + len -= 4; } - if (!n ) return to; + if (!len) + return to; tmp_from += 3; tmp_to += 3; do { *++tmp_to = *++tmp_from; - } while (--n); + } while (--len); return to; align: + /* ???: Do we really need to generate the carry flag here? If not, then: + rem -= 4; */ rem = 4 - rem; - n = n - rem; + len -= rem; do { *(tmp_to+4) = *(tmp_from+4); ++tmp_from; ++tmp_to; } while (--rem); - chunks = n / 8; + chunks = len / 8; if (chunks) goto copy_chunks; goto lessthan8; |