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wcsmbs: optimize wcscpy 

This patch rewrites wcscpy using wcslen and wmemcpy.  This is similar
to the optimization done on strcpy by b863d2bc4d.

Checked on x86_64-linux-gnu.

	* wcsmbs/wcscpy.c (__wcpcpy): Rewrite using wcslen and wmemcpy.
This commit is contained in:
Adhemerval Zanella 2019-02-05 18:32:03 -02:00
parent 81a1443941
commit 4d8015639a
2 changed files with 3 additions and 30 deletions
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2
ChangeLog
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@ -1,5 +1,7 @@
2019-02-27 Adhemerval Zanella <adhemerval.zanella@linaro.org> 2019-02-27 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* wcsmbs/wcscpy.c (__wcpcpy): Rewrite using wcslen and wmemcpy.
* include/wchar.h (__wcscpy): New prototype. * include/wchar.h (__wcscpy): New prototype.
* sysdeps/powerpc/powerpc32/power4/multiarch/wcscpy-ppc32.c * sysdeps/powerpc/powerpc32/power4/multiarch/wcscpy-ppc32.c
(__wcscpy): Route internal symbol to generic implementation. (__wcscpy): Route internal symbol to generic implementation.

31
wcsmbs/wcscpy.c
View File

@ -16,7 +16,6 @@
License along with the GNU C Library; if not, see License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */ <http://www.gnu.org/licenses/>. */
#include <stddef.h>
#include <wchar.h> #include <wchar.h>
@ -28,35 +27,7 @@
wchar_t * wchar_t *
__wcscpy (wchar_t *dest, const wchar_t *src) __wcscpy (wchar_t *dest, const wchar_t *src)
{ {
wint_t c; return __wmemcpy (dest, src, __wcslen (src) + 1);
wchar_t *wcp;
if (__alignof__ (wchar_t) >= sizeof (wchar_t))
{
const ptrdiff_t off = dest - src - 1;
wcp = (wchar_t *) src;
do
{
c = *wcp++;
wcp[off] = c;
}
while (c != L'\0');
}
else
{
wcp = dest;
do
{
c = *src++;
*wcp++ = c;
}
while (c != L'\0');
}
return dest;
} }
#ifndef WCSCPY #ifndef WCSCPY
weak_alias (__wcscpy, wcscpy) weak_alias (__wcscpy, wcscpy)