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wcsmbs: optimize wcpncpy

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This patch rewrites wcpncpy using wcslen, wmemcpy, and wmemset.  This is
similar to the optimization done on stpncpy by 48497aba8e.

Checked on x86_64-linux-gnu.

        * wcsmbs/wcpncpy.c (__wcpcpy): Rewrite using wcslen, wmemcpy, and
	wmemset.
This commit is contained in:
Adhemerval Zanella 2019-02-05 17:34:21 -02:00
parent 7b3fb62051
commit 39ef074419
2 changed files with 8 additions and 52 deletions
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3
ChangeLog
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@ -1,5 +1,8 @@
2019-02-27 Adhemerval Zanella <adhemerval.zanella@linaro.org>
* wcsmbs/wcpncpy.c (__wcpcpy): Rewrite using wcslen, wmemcpy, and
wmemset.
* sysdeps/m68k/wcpcpy.c: Remove file.
* wcsmbs/wcpcpy.c (__wcpcpy): Rewrite using wcslen and wmemcpy.

57
wcsmbs/wcpncpy.c
View File

@ -27,59 +27,12 @@
wchar_t *
__wcpncpy (wchar_t *dest, const wchar_t *src, size_t n)
{
wint_t c;
wchar_t *const s = dest;
if (n >= 4)
{
size_t n4 = n >> 2;
for (;;)
{
c = *src++;
*dest++ = c;
if (c == L'\0')
break;
c = *src++;
*dest++ = c;
if (c == L'\0')
break;
c = *src++;
*dest++ = c;
if (c == L'\0')
break;
c = *src++;
*dest++ = c;
if (c == L'\0')
break;
if (--n4 == 0)
goto last_chars;
}
n -= dest - s;
goto zero_fill;
}
last_chars:
n &= 3;
if (n == 0)
size_t size = __wcsnlen (src, n);
__wmemcpy (dest, src, size);
dest += size;
if (size == n)
return dest;
for (;;)
{
c = *src++;
--n;
*dest++ = c;
if (c == L'\0')
break;
if (n == 0)
return dest;
}
zero_fill:
while (n-- > 0)
dest[n] = L'\0';
return dest - 1;
return wmemset (dest, L'\0', (n - size));
}
#ifndef WCPNCPY