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authorEric Andersen <andersen@codepoet.org>2003-11-20 15:23:03 +0000
committerEric Andersen <andersen@codepoet.org>2003-11-20 15:23:03 +0000
commitee4435bcd6f94b7463cbd7e960e84ddf03965272 (patch)
tree4d8ab5b8d85897e3b0844ad26b804300e90a2d81 /libc/string/arm/bcopy.S
parent72a8f4125ba443d28f9398a45ec5c4c9504c3e8f (diff)
Add an initial set of arm optimized string functions. These
do seem to make noticable speed improvement... -Erik
Diffstat (limited to 'libc/string/arm/bcopy.S')
-rw-r--r--libc/string/arm/bcopy.S52
1 files changed, 52 insertions, 0 deletions
diff --git a/libc/string/arm/bcopy.S b/libc/string/arm/bcopy.S
new file mode 100644
index 000000000..c256df3f3
--- /dev/null
+++ b/libc/string/arm/bcopy.S
@@ -0,0 +1,52 @@
+/*-
+ * Copyright (c) 1997 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Neil A. Carson and Mark Brinicombe
+ *
+ * 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 NetBSD
+ * Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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.
+ *
+ * Adapted for uClibc from NetBSD bcopy.S,v 1.2 1997/10/09
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+/* bcopy = memcpy/memmove with arguments reversed. */
+
+ .text
+ .global bcopy;
+ .type bcopy,%function
+ .align 4; \
+
+bcopy:
+ /* switch the source and destination registers */
+ eor r0, r1, r0
+ eor r1, r0, r1
+ eor r0, r1, r0
+ b _memcpy (PLT)