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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/strncmp.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/strncmp.S')
-rw-r--r--libc/string/arm/strncmp.S53
1 files changed, 53 insertions, 0 deletions
diff --git a/libc/string/arm/strncmp.S b/libc/string/arm/strncmp.S
new file mode 100644
index 000000000..6f478b5ed
--- /dev/null
+++ b/libc/string/arm/strncmp.S
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2002 ARM Ltd
+ * 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. The name of the company may not be used to endorse or promote
+ * products derived from this software without specific prior written
+ * permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY ARM LTD ``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 ARM LTD 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 strncmp.S, version 1.2 2003/04/05
+ * by Erik Andersen <andersen@codepoet.org>
+ */
+
+ .text
+ .global strncmp;
+ .type strncmp,%function
+ .align 4; \
+
+strncmp:
+ /* if ((len - 1) < 0) return 0 */
+ subs r2, r2, #1
+ movmi r0, #0
+ movmi pc, lr
+
+ /* ip == last src address to compare */
+ add ip, r0, r2
+1:
+ ldrb r2, [r0], #1
+ ldrb r3, [r1], #1
+ cmp ip, r0
+ cmpcs r2, #1
+ cmpcs r2, r3
+ beq 1b
+ sub r0, r2, r3
+ mov pc, lr