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/* Copyright (c) 2005, 2007 Dmitry Xmelkov
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name of the copyright holders nor the names of
contributors may be used to endorse or promote products derived
from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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. */
/* $Id: ffsll.S,v 1.3.2.1 2009/04/01 23:12:12 arcanum Exp $ */
/** \file */
/** \ingroup avr_string
\fn int ffsll (long long val);
\brief Same as ffs(), for an argument of type long long. */
#ifndef __DOXYGEN__
#include "macros.inc"
#define val_0 r18
#define val_8 r19
#define val_16 r20
#define val_24 r21
#define val_32 r22
#define val_40 r23
#define val_48 r24
#define val_56 r25
#define wrd_lo r30
#define wrd_hi r31
#define cntr r18
ASSEMBLY_CLIB_SECTION
.global _U(ffsll)
.type _U(ffsll), @function
_U(ffsll):
X_movw wrd_lo, val_0
ldi cntr, 1
sbiw wrd_lo, 0
brne 1f
X_movw wrd_lo, val_16
subi cntr, -16
sbiw wrd_lo, 0
brne 1f
X_movw wrd_lo, val_32
subi cntr, -16
sbiw wrd_lo, 0
brne 1f
X_movw wrd_lo, val_48
subi cntr, -16
sbiw wrd_lo, 0
breq 9f
1: tst wrd_lo
brne 3f
subi cntr, -7
mov wrd_lo, wrd_hi
2: inc cntr
3: ror wrd_lo
brcc 2b
mov r24, cntr
clr r25
9: ret
.size _U(ffsll), . - _U(ffsll)
.end
#endif /* not __DOXYGEN__ */
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