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authorTim J. Robbins <tjr@FreeBSD.org>2003-03-14 11:01:12 +0000
committerTim J. Robbins <tjr@FreeBSD.org>2003-03-14 11:01:12 +0000
commit564529ff1a2112926d9946e29ce723437d75c116 (patch)
tree9e30094c561125c928b29fc1cd56997740d9276d /lib
parent9503d41cb1bda3d6f321143d06b540f9c0ce2dc2 (diff)
downloadsrc-564529ff1a2112926d9946e29ce723437d75c116.tar.gz
src-564529ff1a2112926d9946e29ce723437d75c116.zip
MFp4: Pentium/Athlon-optimised implementation of wcslen().
Notes
Notes: svn path=/head/; revision=112232
Diffstat (limited to 'lib')
-rw-r--r--lib/libc/i386/string/Makefile.inc2
-rw-r--r--lib/libc/i386/string/wcslen.S68
2 files changed, 69 insertions, 1 deletions
diff --git a/lib/libc/i386/string/Makefile.inc b/lib/libc/i386/string/Makefile.inc
index b1a5277058c5..28df6e7397e3 100644
--- a/lib/libc/i386/string/Makefile.inc
+++ b/lib/libc/i386/string/Makefile.inc
@@ -3,4 +3,4 @@
MDSRCS+=bcmp.S bcopy.S bzero.S ffs.S index.S memchr.S memcmp.S memcpy.S \
memmove.S memset.S rindex.S strcat.S strchr.S strcmp.S strcpy.S \
- strlen.S strncmp.S strrchr.S swab.S wcscmp.S wmemchr.S
+ strlen.S strncmp.S strrchr.S swab.S wcscmp.S wcslen.S wmemchr.S
diff --git a/lib/libc/i386/string/wcslen.S b/lib/libc/i386/string/wcslen.S
new file mode 100644
index 000000000000..2bebc1e39ed3
--- /dev/null
+++ b/lib/libc/i386/string/wcslen.S
@@ -0,0 +1,68 @@
+/*-
+ * Copyright (c) 2003 Tim J. Robbins.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <machine/asm.h>
+__FBSDID("$FreeBSD$");
+
+/*
+ * size_t
+ * wcslen(const wchar_t *s) --
+ * Find the length of a wide character string.
+ */
+ENTRY(wcslen)
+ movl 4(%esp),%ecx /* String */
+ pushl %ebx
+ xorl %ebx,%ebx
+ xorl %eax,%eax
+.p2align 4,0x90
+L1: cmpl %ebx,(%ecx)
+ jz found0
+ cmpl %ebx,4(%ecx)
+ jz found1
+ cmpl %ebx,8(%ecx)
+ jz found2
+ cmpl %ebx,12(%ecx)
+ jz found3
+ cmpl %ebx,16(%ecx)
+ jz found4
+ cmpl %ebx,20(%ecx)
+ jz found5
+ cmpl %ebx,24(%ecx)
+ jz found6
+ cmpl %ebx,28(%ecx)
+ jz found7
+ leal 32(%ecx),%ecx
+ addl $8,%eax
+ jmp L1
+found7: incl %eax
+found6: incl %eax
+found5: incl %eax
+found4: incl %eax
+found3: incl %eax
+found2: incl %eax
+found1: incl %eax
+found0: popl %ebx
+ ret