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author | Will Schmidt <will_schmidt@vnet.ibm.com> | 2012-08-22 11:04:42 -0500 |
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committer | Ryan S. Arnold <rsa@linux.vnet.ibm.com> | 2012-08-22 11:04:42 -0500 |
commit | 15d0da8cb36f5c96a3c649d29a2e2623e995cd49 (patch) | |
tree | 3c1ccdcbc8fb94fb795fc13e519e02957d02e626 /sysdeps/powerpc/powerpc32/power6/wcschr.c | |
parent | bcca089526c6859e775243731037a469aec3065c (diff) | |
download | glibc-15d0da8cb36f5c96a3c649d29a2e2623e995cd49.tar.gz glibc-15d0da8cb36f5c96a3c649d29a2e2623e995cd49.tar.xz glibc-15d0da8cb36f5c96a3c649d29a2e2623e995cd49.zip |
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.
Diffstat (limited to 'sysdeps/powerpc/powerpc32/power6/wcschr.c')
-rw-r--r-- | sysdeps/powerpc/powerpc32/power6/wcschr.c | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/sysdeps/powerpc/powerpc32/power6/wcschr.c b/sysdeps/powerpc/powerpc32/power6/wcschr.c new file mode 100644 index 0000000000..a981427f72 --- /dev/null +++ b/sysdeps/powerpc/powerpc32/power6/wcschr.c @@ -0,0 +1,88 @@ +/* wcschr.c - Wide Character Search for powerpc32/power6. + Copyright (C) 2012 Free Software Foundation, Inc. + 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 first occurrence of WC in WCS. */ +wchar_t * +wcschr (wcs, wc) + register const wchar_t *wcs; + register const wchar_t wc; +{ + register const wchar_t *wcs2 = wcs + 1; + + 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) |