07b7877809
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
40 lines
1.4 KiB
ArmAsm
40 lines
1.4 KiB
ArmAsm
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id $
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*
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* Copyright (C) 2007 Nils Wallménius
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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/* size_t strlen(const char *str) */
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.section .text,"ax",@progbits
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.align 2
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.globl strlen
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.type strlen, @function
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strlen:
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move.l 4(%sp),%a0 /* %a0 = *str */
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move.l %a0,%d0 /* %d0 = start address */
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1:
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tst.b (%a0)+ /* test if %a0 == 0 and increment */
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bne.b 1b /* if the test was false repeat */
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sub.l %d0,%a0 /* how many times did we repeat? */
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move.l %a0,%d0
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subq.l #1,%d0 /* %d0 is 1 too large due to the last increment */
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rts
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.size strlen, .-strlen
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