diff options
Diffstat (limited to 'libc')
| -rw-r--r-- | libc/string/generic/memmove.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/libc/string/generic/memmove.c b/libc/string/generic/memmove.c index 1ac018013..5389cc029 100644 --- a/libc/string/generic/memmove.c +++ b/libc/string/generic/memmove.c @@ -23,8 +23,9 @@ #include "memcopy.h" #include "pagecopy.h" -#ifndef __ARCH_HAS_BWD_MEMCPY__ +#if defined(__ARCH_HAS_BWD_MEMCPY__) || defined(__mips__) /* generic-opt memmove assumes memcpy does forward copying! */ +/* also needed for MIPS as its memcpy does not support overlapping regions */ #include "_memcpy_fwd.c" #endif @@ -224,8 +225,11 @@ void *memmove (void *dest, const void *src, size_t len) Reduces the working set. */ if (dstp - srcp >= len) /* *Unsigned* compare! */ { -#ifdef __ARCH_HAS_BWD_MEMCPY__ - /* Backward memcpy implementation can be used */ + /* Calling memcpy() from memmove() should be skipped in two cases: + * a) if arch's memcpy uses a backward copying (SH4) + * b) if arch's memcpy is not fully safe for overlapping regions (MIPS) + */ +#if !defined(__ARCH_HAS_BWD_MEMCPY_) && !defined(__mips__) memcpy(dest, src, len); #else /* Copy from the beginning to the end. */ |