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15d0da8cb3
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.
89 lines
2.1 KiB
C
89 lines
2.1 KiB
C
/* wcsrchr.c - Wide Character Reverse Search for powerpc32/power6.
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Copyright (C) 2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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#include <wchar.h>
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/* Find the last occurrence of WC in WCS. */
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wchar_t *
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wcsrchr (wcs, wc)
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register const wchar_t *wcs;
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register const wchar_t wc;
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{
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register const wchar_t *wcs2 = wcs + 1;
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const wchar_t *retval = NULL;
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if (*wcs == wc)
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retval = wcs;
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if (*wcs == L'\0') return (wchar_t *) retval;
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do
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{
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wcs+=2;
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if (*wcs2 == wc)
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retval = wcs2;
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if (*wcs2 == L'\0')
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return (wchar_t *) retval;
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wcs2+=2;
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if (*wcs == wc)
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retval = wcs;
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if (*wcs == L'\0')
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return (wchar_t *) retval;
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wcs+=2;
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if (*wcs2 == wc)
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retval = wcs2;
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if (*wcs2 == L'\0')
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return (wchar_t *) retval;
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wcs2+=2;
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if (*wcs == wc)
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retval = wcs;
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if (*wcs == L'\0')
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return (wchar_t *) retval;
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wcs+=2;
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if (*wcs2 == wc)
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retval = wcs2;
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if (*wcs2 == L'\0')
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return (wchar_t *) retval;
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wcs2+=2;
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if (*wcs == wc)
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retval = wcs;
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if (*wcs == L'\0')
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return (wchar_t *) retval;
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wcs+=2;
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if (*wcs2 == wc)
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retval = wcs2;
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if (*wcs2 == L'\0')
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return (wchar_t *) retval;
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wcs2+=2;
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if (*wcs == wc)
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retval = wcs;
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}
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while (*wcs != L'\0');
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return (wchar_t *) retval;
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}
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