PeerStreamer

/*

 * simple math operations

 * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al

 *

 * This file is part of FFmpeg.

 *

 * FFmpeg is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Lesser General Public

 * License as published by the Free Software Foundation; either

 * version 2.1 of the License, or (at your option) any later version.

 *

 * FFmpeg is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Lesser General Public License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public

 * License along with FFmpeg; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

 */

#ifndef FFMPEG_ARMV4L_MATHOPS_H

#define FFMPEG_ARMV4L_MATHOPS_H

#ifdef FRAC_BITS

#   define MULL(a, b) \

        ({  int lo, hi;\

         asm("smull %0, %1, %2, %3     \n\t"\

             "mov   %0, %0,     lsr %4\n\t"\

             "add   %1, %0, %1, lsl %5\n\t"\

             : "=&r"(lo), "=&r"(hi)\

             : "r"(b), "r"(a), "i"(FRAC_BITS), "i"(32-FRAC_BITS));\

         hi; })

#endif

#define MULH(a, b) \

    ({ int lo, hi;\

     asm ("smull %0, %1, %2, %3" : "=&r"(lo), "=&r"(hi) : "r"(b), "r"(a));\

     hi; })

#if defined(HAVE_ARMV5TE)

/* signed 16x16 -> 32 multiply add accumulate */

#   define MAC16(rt, ra, rb) \

        asm ("smlabb %0, %2, %3, %0" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));

/* signed 16x16 -> 32 multiply */

#   define MUL16(ra, rb)                                                \

        ({ int __rt;                                                    \

         asm ("smulbb %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb));  \

         __rt; })

#endif

#endif /* FFMPEG_ARMV4L_MATHOPS_H */