/* Copyright (c) 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. */ /* $Id$ */ #if !defined(__AVR_TINY__) #if !defined(__DOXYGEN__) #include "asmdef.h" #define src_hi r25 #define src_lo r24 #define val r22 #define len_hi r21 #define len_lo r20 #define ret_lo r24 ENTRY memrchr X_movw ZL, len_lo adiw ZL, 0 breq 2f ; len is 0, return NULL add ZL, src_lo adc ZH, src_hi 1: ld r0, -Z cp r0, val breq 2f ; val is found subi len_lo, lo8(1) sbci len_hi, hi8(1) brne 1b X_movw ZL, len_lo ; is zero 2: X_movw ret_lo, ZL ret ENDFUNC #endif /* not __DOXYGEN__ */ #endif /* !defined(__AVR_TINY__) */