mathops.h

   1 /*
   2  * simple math operations
   3  * Copyright (c) 2001, 2002 Fabrice Bellard
   4  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License as published by the Free Software Foundation; either
  11  * version 2.1 of the License, or (at your option) any later version.
  12  *
  13  * FFmpeg is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16  * Lesser General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU Lesser General Public
  19  * License along with FFmpeg; if not, write to the Free Software
  20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21  */
  22
  23 #ifndef AVCODEC_PPC_MATHOPS_H
  24 #define AVCODEC_PPC_MATHOPS_H
  25
  26 #include <stdint.h>
  27 #include "config.h"
  28 #include "libavutil/common.h"
  29
  30 #if HAVE_PPC4XX
  31 /* signed 16x16 -> 32 multiply add accumulate */
  32 #define MAC16(rt, ra, rb) \
  33     __asm__ ("maclhw %0, %2, %3" : "=r" (rt) : "0" (rt), "r" (ra), "r" (rb));
  34
  35 /* signed 16x16 -> 32 multiply */
  36 #define MUL16(ra, rb) \
  37     ({ int __rt; \
  38     __asm__ ("mullhw %0, %1, %2" : "=r" (__rt) : "r" (ra), "r" (rb)); \
  39     __rt; })
  40 #endif
  41
  42 #define MULH MULH
  43 static inline av_const int MULH(int a, int b){
  44     int r;
  45     __asm__ ("mulhw %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
  46     return r;
  47 }
  48
  49 #if !ARCH_PPC64
  50 static inline av_const int64_t MAC64(int64_t d, int a, int b)
  51 {
  52     union { uint64_t x; unsigned hl[2]; } x = { d };
  53     int h, l;
  54     __asm__ ("mullw %3, %4, %5   \n\t"
  55              "mulhw %2, %4, %5   \n\t"
  56              "addc  %1, %1, %3   \n\t"
  57              "adde  %0, %0, %2   \n\t"
  58              : "+r"(x.hl[0]), "+r"(x.hl[1]), "=&r"(h), "=&r"(l)
  59              : "r"(a), "r"(b));
  60     return x.x;
  61 }
  62 #define MAC64(d, a, b) ((d) = MAC64(d, a, b))
  63
  64 static inline av_const int64_t MLS64(int64_t d, int a, int b)
  65 {
  66     union { uint64_t x; unsigned hl[2]; } x = { d };
  67     int h, l;
  68     __asm__ ("mullw %3, %4, %5   \n\t"
  69              "mulhw %2, %4, %5   \n\t"
  70              "subfc %1, %3, %1   \n\t"
  71              "subfe %0, %2, %0   \n\t"
  72              : "+r"(x.hl[0]), "+r"(x.hl[1]), "=&r"(h), "=&r"(l)
  73              : "r"(a), "r"(b));
  74     return x.x;
  75 }
  76 #define MLS64(d, a, b) ((d) = MLS64(d, a, b))
  77 #endif
  78
  79 #endif /* AVCODEC_PPC_MATHOPS_H */