From: Siddhesh Poyarekar Date: Fri, 4 Jul 2014 19:39:15 +0000 (+0530) Subject: Add comment for MEMCPY_OK_FOR_FWD_MEMMOVE X-Git-Tag: glibc-2.20~139 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=96baf6ffc57b811bbc424a1fc72ef77dd56d7a18;p=thirdparty%2Fglibc.git Add comment for MEMCPY_OK_FOR_FWD_MEMMOVE --- diff --git a/ChangeLog b/ChangeLog index a9574c9508c..d5458c7030c 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2014-07-04 Siddhesh Poyarekar + + * sysdeps/generic/memcopy.h: Add comment for + MEMCPY_OK_FOR_FWD_MEMMOVE. + 2014-07-04 Will Newton * string/memchr.c: Merge from gnulib. diff --git a/sysdeps/generic/memcopy.h b/sysdeps/generic/memcopy.h index 45c5fcb479f..f7b9423f0ee 100644 --- a/sysdeps/generic/memcopy.h +++ b/sysdeps/generic/memcopy.h @@ -190,6 +190,9 @@ extern void _wordcopy_bwd_dest_aligned (long int, long int, size_t) __THROW; /* Threshold value for when to enter the unrolled loops. */ #define OP_T_THRES 16 +/* Set to 1 if memcpy is safe to use for forward-copying memmove with + overlapping addresses. This is 0 by default because memcpy implementations + are generally not safe for overlapping addresses. */ #define MEMCPY_OK_FOR_FWD_MEMMOVE 0 #endif /* memcopy.h */