| /* Copyright (c) 2002, 2006, 2007 Marek Michalkiewicz |
| 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. */ |
| |
| /* |
| mul10.S - optimized 16-bit multiply by 10 |
| |
| Contributors: |
| Created by Marek Michalkiewicz <marekm@linux.org.pl> |
| */ |
| |
| #if !defined(__DOXYGEN__) |
| |
| #include "macros.inc" |
| |
| #define r_hi r25 |
| #define r_lo r24 |
| #define r_tmp2 r23 |
| #define r_tmp_lo r22 |
| #define r_tmp_hi r23 |
| |
| /* |
| r_hi:r_lo *= 10 |
| |
| Optimized version, without calling __mulhi3 (which is slow for |
| non-enhanced core, and not present in libgcc.a for enhanced core). |
| */ |
| |
| ASSEMBLY_CLIB_SECTION |
| .global _U(__mulhi_const_10) |
| |
| _U(__mulhi_const_10): |
| #if defined(__AVR_HAVE_MUL__) |
| ldi r_tmp2,10 |
| mul r_hi,r_tmp2 |
| mov r_hi,r0 |
| mul r_lo,r_tmp2 |
| mov r_lo,r0 |
| add r_hi,r1 |
| clr r1 ; __zero_reg__ |
| #else |
| X_movw r_tmp_lo, r_lo |
| add r_lo,r_lo |
| adc r_hi,r_hi |
| add r_lo,r_lo |
| adc r_hi,r_hi |
| add r_lo, r_tmp_lo |
| adc r_hi, r_tmp_hi |
| add r_lo,r_lo |
| adc r_hi,r_hi |
| #endif |
| ret |
| |
| #endif /* not __DOXYGEN__ */ |
