sync to ragge

1 files changed, 63 insertions, 0 deletions

diff --git a/lib/libc/arch/vax/string/index.S b/lib/libc/arch/vax/string/index.S
new file mode 100644
index 00000000000..07842c5b3d1
--- /dev/null
+++ b/lib/libc/arch/vax/string/index.S
@@ -0,0 +1,63 @@
+/*	$NetBSD: index.S,v 1.1 1996/05/19 15:57:43 ragge Exp $	*/
+/*
+ * Copyright (c) 1980, 1993
+ *	The Regents of the University of California.  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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
+ */
+
+/*
+ * Find the first occurence of c in the string cp.
+ * Return pointer to match or null pointer.
+ *
+ * char *
+ * index(cp, c)
+ *	char *cp, c;
+ */
+#include "DEFS.h"
+
+/* Alas not quite twice as fast as the generic C version on a uvax2 */
+
+ENTRY(index, 0)
+	movq	4(ap),r0	# r0 = cp; r1 = c
+	tstb	r1		# special case, looking for '\0'
+	jeql	3f
+1:
+	cmpb	(r0),r1
+	jeql	2f
+	tstb	(r0)+
+	jneq	1b
+	clrl	r0		# return NULL if no match
+2:
+	ret
+3:
+	tstb	(r0)+
+	jneq	3b
+	decl	r0
+	jbr	2b