On Thu, Sep 15, 2016 at 03:27:52PM +0000, Wilco Dijkstra wrote:
> That's best done GCC as a general optimization as currently mempcpy is not
> handled efficiently (see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70140),
> and it avoids having to repeat this for every C library out there...
>
> glibc/string/mempcpy.c:
>
> void *
> MEMPCPY (void *dest, const void *src, size_t len)
> {
> return memcpy (dest, src, len) + len;
> }
>
> And glibc/string/stpcpy.c:
>
> char *
> STPCPY (char *dest, const char *src)
> {
> size_t len = strlen (src);
> return memcpy (dest, src, len + 1) + len;
> }
Those are the generic definitions, all targets that care about performance
obviously should replace them with assembly code.
Jakub
