Speed up SSE4.2 strcasestr by avoiding indirect function call.

1 files changed, 50 insertions, 0 deletions

diff --git a/sysdeps/x86_64/multiarch/strcasestr-nonascii.c b/sysdeps/x86_64/multiarch/strcasestr-nonascii.c
new file mode 100644
index 0000000000..0804e96de7
--- /dev/null
+++ b/sysdeps/x86_64/multiarch/strcasestr-nonascii.c
@@ -0,0 +1,50 @@
+/* strstr with SSE4.2 intrinsics
+   Copyright (C) 2010 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; if not, write to the Free
+   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+   02111-1307 USA.  */
+
+# include <ctype.h>
+
+
+/* Similar to __m128i_strloadu.  Convert to lower case for none-POSIX/C
+   locale.  */
+static inline __m128i
+__m128i_strloadu_tolower (const unsigned char * p)
+{
+  union
+    {
+      char b[16];
+      __m128i x;
+    } u;
+
+  for (int i = 0; i < 16; ++i)
+    if (p[i] == 0)
+      {
+	u.b[i] = 0;
+	break;
+      }
+    else
+      u.b[i] = tolower (p[i]);
+
+  return u.x;
+}
+
+
+#define STRCASESTR_NONASCII
+#define USE_AS_STRCASESTR
+#define STRSTR_SSE42 attribute_hidden __strcasestr_sse42_nonascii
+#include "strstr.c"