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glibc/sysdeps/powerpc/powerpc32/power6/wcsrchr.c

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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
/* wcsrchr.c - Wide Character Reverse Search for powerpc32/power6.
Update copyright notices with scripts/update-copyrights.
2013-01-02 19:01:50 +00:00
Copyright (C) 2012-2013 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>
/* Find the last occurrence of WC in WCS. */
wchar_t *
wcsrchr (wcs, wc)
Avoid use of "register" as optimization hint.
2013-06-07 22:24:35 +00:00
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
const wchar_t *retval = NULL;
if (*wcs == wc)
retval = wcs;
if (*wcs == L'\0') return (wchar_t *) retval;
do
{
wcs+=2;
if (*wcs2 == wc)
retval = wcs2;
if (*wcs2 == L'\0')
return (wchar_t *) retval;
wcs2+=2;
if (*wcs == wc)
retval = wcs;
if (*wcs == L'\0')
return (wchar_t *) retval;
wcs+=2;
if (*wcs2 == wc)
retval = wcs2;
if (*wcs2 == L'\0')
return (wchar_t *) retval;
wcs2+=2;
if (*wcs == wc)
retval = wcs;
if (*wcs == L'\0')
return (wchar_t *) retval;
wcs+=2;
if (*wcs2 == wc)
retval = wcs2;
if (*wcs2 == L'\0')
return (wchar_t *) retval;
wcs2+=2;
if (*wcs == wc)
retval = wcs;
if (*wcs == L'\0')
return (wchar_t *) retval;
wcs+=2;
if (*wcs2 == wc)
retval = wcs2;
if (*wcs2 == L'\0')
return (wchar_t *) retval;
wcs2+=2;
if (*wcs == wc)
retval = wcs;
}
while (*wcs != L'\0');
return (wchar_t *) retval;
}
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