From 07b7877809e27fed9f11eeb8d6ed92a369c38225 Mon Sep 17 00:00:00 2001
From: Nils Wallménius <nils@rockbox.org>
Date: Mon, 25 Jun 2007 20:21:37 +0000
Subject: Simple coldfire assembly strlen() function, 20-25% faster than the c
 version. Move function out of iram as it turns out that makes it slightly
 faster.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@13713 a1c6a512-1295-4272-9138-f99709370657
---
 firmware/SOURCES                           |  2 +-
 firmware/target/coldfire/strlen-coldfire.S | 40 ++++++++++++++++++++++++++++++
 2 files changed, 41 insertions(+), 1 deletion(-)
 create mode 100644 firmware/target/coldfire/strlen-coldfire.S

diff --git a/firmware/SOURCES b/firmware/SOURCES
index 2b948e7df4..c642196d5c 100644
--- a/firmware/SOURCES
+++ b/firmware/SOURCES
@@ -250,13 +250,13 @@ target/sh/system-sh.c
 
 #elif defined(CPU_COLDFIRE)
 
-common/strlen.c
 #ifndef SIMULATOR
 target/coldfire/crt0.S
 target/coldfire/memcpy-coldfire.S
 target/coldfire/memmove-coldfire.S
 target/coldfire/memset-coldfire.S
 target/coldfire/memswap128-coldfire.S
+target/coldfire/strlen-coldfire.S
 #if defined(HAVE_LCD_COLOR) \
  || defined(HAVE_REMOTE_LCD) && (LCD_REMOTE_PIXELFORMAT == VERTICAL_INTERLEAVED)
 target/coldfire/memset16-coldfire.S
diff --git a/firmware/target/coldfire/strlen-coldfire.S b/firmware/target/coldfire/strlen-coldfire.S
new file mode 100644
index 0000000000..9be42a5864
--- /dev/null
+++ b/firmware/target/coldfire/strlen-coldfire.S
@@ -0,0 +1,40 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id $
+ *
+ * Copyright (C) 2007 Nils Wallménius
+ *
+ * All files in this archive are subject to the GNU General Public License.
+ * See the file COPYING in the source tree root for full license agreement.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+/* size_t strlen(const char *str) */
+
+    .section    .text,"ax",@progbits
+    .align  2
+    .globl  strlen
+    .type   strlen, @function
+
+strlen:
+    move.l 4(%sp),%a0    /* %a0 = *str */
+    move.l %a0,%d0       /* %d0 = start address */
+
+    1:
+    tst.b (%a0)+         /* test if %a0 == 0 and increment */
+    bne.b 1b             /* if the test was false repeat */
+
+    sub.l %d0,%a0        /* how many times did we repeat? */
+    move.l %a0,%d0
+    subq.l #1,%d0        /* %d0 is 1 too large due to the last increment */
+    rts
+    .size   strlen, .-strlen
+
-- 
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