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All functions that have problems copying between overlapping arrays are explicitly identified in this manual. In addition to functions in this section, there are a few others like sprintf (see Formatted Output Functions) and scanf (see Formatted Input Functions). Function: void * memcpy (void *restrict to , const void *restrict from
Most notably, in glibc 2.13 a performance optimization of memcpy() on some platforms (including x86-64) included changing the order in which bytes were copied from src to dest. This change revealed breakages in a number of applications that performed copying with overlapping areas. Under the previous implementation,
10 Nov 2010 It seems that the glibc folks changed the implementation of memcpy() to one which, in theory, is more highly optimized for current processors. The number of times I've searched on what I think is the obvious search key, wasted half-an-hour or so doing it, then done a manual scroll through whatever I can
10 Feb 2010 This article describes a fast and portable memcpy implementation that can replace the standard library version of memcpy when higher performance is needed. .. its my understanding that things like the glibc and related libs are not using any worthwhile SIMD optimised instructions at this time for several
Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public. License along with the GNU C Library; if not, see. <www.gnu.org/licenses/>. */. #include <string.h>. #include <memcopy.h>. #include <pagecopy.h>. #undef memcpy. void *. memcpy (dstpp, srcpp, len).
Function memcpy(). Copy a memory area. void * memcpy(void). The memcpy() function copies len bytes from memory area src to memory area dest. The memory areas may not overlap. Use memmove() if the memory areas do overlap.
         

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