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glibc/sysdeps/powerpc/power6/wcschr.c

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PowerPC: multiarch wcschr for PowerPC32
2013-10-14 14:23:12 +00:00
/* wcschr.c - Wide Character Search for POWER6+.
Update copyright notices with scripts/update-copyrights
2014-01-01 11:03:15 +00:00
Copyright (C) 2012-2014 Free Software Foundation, Inc.
Add versions of wcscpy, wcschr, wcsrchr for power6/power7. Initially based on the versions found in wcsmbs/* ; these files have been changed by hand unrolling, and adding some additional variables to allow some read-ahead to occur, which then relieves some of the wait-for-increment/wait-for-load/wait-for-compare-results pressure that was slowing down every iteration through the while-loop. For 64-bit Power7, These changes give an approx 20% throughput boost for the wcschr and wcsrchr functions; and approx 40% boost for the wcscpy function. 32-bit improvements appear to be slightly better with ~ %30 and ~ %45 respectively. Results for Power6 closely match those for power7.
2012-08-22 16:04:42 +00:00
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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; see the file COPYING.LIB. If
not, see <http://www.gnu.org/licenses/>. */
#include <wchar.h>
PowerPC: multiarch wcschr for PowerPC32
2013-10-14 14:23:12 +00:00
#ifndef WCSCHR
# define WCSCHR wcschr
#endif
Add versions of wcscpy, wcschr, wcsrchr for power6/power7. Initially based on the versions found in wcsmbs/* ; these files have been changed by hand unrolling, and adding some additional variables to allow some read-ahead to occur, which then relieves some of the wait-for-increment/wait-for-load/wait-for-compare-results pressure that was slowing down every iteration through the while-loop. For 64-bit Power7, These changes give an approx 20% throughput boost for the wcschr and wcsrchr functions; and approx 40% boost for the wcscpy function. 32-bit improvements appear to be slightly better with ~ %30 and ~ %45 respectively. Results for Power6 closely match those for power7.
2012-08-22 16:04:42 +00:00
/* Find the first occurrence of WC in WCS. */
wchar_t *
PowerPC: multiarch wcschr for PowerPC32
2013-10-14 14:23:12 +00:00
WCSCHR (const wchar_t *wcs, const wchar_t wc)
Add versions of wcscpy, wcschr, wcsrchr for power6/power7. Initially based on the versions found in wcsmbs/* ; these files have been changed by hand unrolling, and adding some additional variables to allow some read-ahead to occur, which then relieves some of the wait-for-increment/wait-for-load/wait-for-compare-results pressure that was slowing down every iteration through the while-loop. For 64-bit Power7, These changes give an approx 20% throughput boost for the wcschr and wcsrchr functions; and approx 40% boost for the wcscpy function. 32-bit improvements appear to be slightly better with ~ %30 and ~ %45 respectively. Results for Power6 closely match those for power7.
2012-08-22 16:04:42 +00:00
{
Avoid use of "register" as optimization hint.
2013-06-07 22:24:35 +00:00
const wchar_t *wcs2 = wcs + 1;
Add versions of wcscpy, wcschr, wcsrchr for power6/power7. Initially based on the versions found in wcsmbs/* ; these files have been changed by hand unrolling, and adding some additional variables to allow some read-ahead to occur, which then relieves some of the wait-for-increment/wait-for-load/wait-for-compare-results pressure that was slowing down every iteration through the while-loop. For 64-bit Power7, These changes give an approx 20% throughput boost for the wcschr and wcsrchr functions; and approx 40% boost for the wcscpy function. 32-bit improvements appear to be slightly better with ~ %30 and ~ %45 respectively. Results for Power6 closely match those for power7.
2012-08-22 16:04:42 +00:00
if (*wcs == wc)
return (wchar_t *) wcs;
if (*wcs == L'\0')
return NULL;
do
{
wcs += 2;
if (*wcs2 == wc)
return (wchar_t *) wcs2;
if (*wcs2 == L'\0')
return NULL;
wcs2 += 2;
if (*wcs == wc)
return (wchar_t *) wcs;
if (*wcs == L'\0')
return NULL;
wcs += 2;
if (*wcs2 == wc)
return (wchar_t *) wcs2;
if (*wcs2 == L'\0')
return NULL;
wcs2 += 2;
if (*wcs == wc)
return (wchar_t *) wcs;
if (*wcs == L'\0')
return NULL;
wcs += 2;
if (*wcs2 == wc)
return (wchar_t *) wcs2;
if (*wcs2 == L'\0')
return NULL;
wcs2 += 2;
if (*wcs == wc)
return (wchar_t *) wcs;
if (*wcs == L'\0')
return NULL;
wcs += 2;
if (*wcs2 == wc)
return (wchar_t *) wcs2;
if (*wcs2 == L'\0')
return NULL;
wcs2 += 2;
if (*wcs == wc)
return (wchar_t *) wcs;
}
while (*wcs != L'\0');
return NULL;
}
libc_hidden_def (wcschr)
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