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author | Jakub Zawadzki <darkjames@darkjames.pl> | 2014-05-22 23:04:40 +0200 |
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committer | Anders Broman <a.broman58@gmail.com> | 2014-06-09 12:02:27 +0000 |
commit | fcb710baec3caa30c2cb7c444bddbe087fc86574 (patch) | |
tree | 1ff3f1c4d9b5dca0794162a1000bede1b3a128e6 /wsutil/ws_mempbrk.c | |
parent | 66695661992beb054eff219dd73a23559220c867 (diff) | |
download | wireshark-fcb710baec3caa30c2cb7c444bddbe087fc86574.tar.gz |
Add sse4.2 optimized function ws_mempbrk_sse42()
In text protocols, like SIP, lot of time is spend guint8_pbrk(),
assume that text is not binary (no NULs), and use SSE4.2 pcmpistri
instruction.
Also move & rename guint8_pbrk() from tvbuff.c as _ws_mempbrk.
HAVE_SSE42 must be defined to use _ws_mempbrk_sse42() only activaded for
Windows currently.
Change-Id: Ic853d84805bdb6492c4f45d2bcc79a973fd9804e
Reviewed-on: https://code.wireshark.org/review/1730
Reviewed-by: Anders Broman <a.broman58@gmail.com>
Diffstat (limited to 'wsutil/ws_mempbrk.c')
-rw-r--r-- | wsutil/ws_mempbrk.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/wsutil/ws_mempbrk.c b/wsutil/ws_mempbrk.c new file mode 100644 index 0000000000..bde8452f8b --- /dev/null +++ b/wsutil/ws_mempbrk.c @@ -0,0 +1,74 @@ +/* ws_mempbrk.c + * + * Wireshark - Network traffic analyzer + * By Gerald Combs <gerald@wireshark.org> + * Copyright 1998 Gerald Combs + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. + */ + +#include "config.h" + +#include <glib.h> +#include "ws_symbol_export.h" +#include "ws_cpuid.h" + +#ifdef HAVE_SSE42 +extern const char *_ws_mempbrk_sse42(const char* haystack, size_t haystacklen, const char *needles); +#endif + +const guint8 *_ws_mempbrk(const guint8* haystack, size_t haystacklen, const guint8 *needles); + +const guint8 * +_ws_mempbrk(const guint8* haystack, size_t haystacklen, const guint8 *needles) +{ + gchar tmp[256] = { 0 }; + const guint8 *haystack_end; + + while (*needles) + tmp[*needles++] = 1; + + haystack_end = haystack + haystacklen; + while (haystack < haystack_end) { + if (tmp[*haystack]) + return haystack; + haystack++; + } + + return NULL; +} + +WS_DLL_PUBLIC const guint8 * +ws_mempbrk(const guint8* haystack, size_t haystacklen, const guint8 *needles) +{ +#ifdef HAVE_SSE42 + guint32 CPUInfo[4]; + guint32 bSSE42Extensions; + /*const int has_sse42 = 1;*/ /* XXX, use CPUID */ +#endif + if (*needles == 0) + return NULL; + +#ifdef HAVE_SSE42 + ws_cpuid(CPUInfo, 1); + + bSSE42Extensions = (CPUInfo[2] & 0x100000); + + if (haystacklen >= 16 && bSSE42Extensions) + return _ws_mempbrk_sse42(haystack, haystacklen, needles); +#endif + + return _ws_mempbrk(haystack, haystacklen, needles); +} |