ffmpeg/libavcodec/arm/mathops.h

   1 /*
   2  * simple math operations
   3  * Copyright (c) 2006 Michael Niedermayer <michaelni@gmx.at> et al
   4  *
   5  * This file is part of FFmpeg.
   6  *
   7  * FFmpeg is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * FFmpeg is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with FFmpeg; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20  */
  21
  22 #ifndef AVCODEC_ARM_MATHOPS_H
  23 #define AVCODEC_ARM_MATHOPS_H
  24
  25 #include <stdint.h>
  26 #include "config.h"
  27 #include "libavutil/common.h"
  28
  29 #if HAVE_INLINE_ASM
  30
  31 #if HAVE_ARMV6_INLINE
  32 #define MULH MULH
  33 static inline av_const int MULH(int a, int b)
  34 {
  35     int r;
  36     __asm__ ("smmul %0, %1, %2" : "=r"(r) : "r"(a), "r"(b));
  37     return r;
  38 }
  39
  40 #define FASTDIV FASTDIV
  41 static av_always_inline av_const int FASTDIV(int a, int b)
  42 {
  43     int r;
  44     __asm__ ("cmp     %2, #2               \n\t"
  45              "ldr     %0, [%3, %2, lsl #2] \n\t"
  46              "ite     le                   \n\t"
  47              "lsrle   %0, %1, #1           \n\t"
  48              "smmulgt %0, %0, %1           \n\t"
  49              : "=&r"(r) : "r"(a), "r"(b), "r"(ff_inverse) : "cc");
  50     return r;
  51 }
  52
  53 #else /* HAVE_ARMV6_INLINE */
  54
  55 #define FASTDIV FASTDIV
  56 static av_always_inline av_const int FASTDIV(int a, int b)
  57 {
  58     int r, t;
  59     __asm__ ("umull %1, %0, %2, %3"
  60              : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
  61     return r;
  62 }
  63 #endif
  64
  65 #define MLS64(d, a, b) MAC64(d, -(a), b)
  66
  67 #if HAVE_ARMV5TE_INLINE
  68
  69 /* signed 16x16 -> 32 multiply add accumulate */
  70 #   define MAC16(rt, ra, rb)                                            \
  71     __asm__ ("smlabb %0, %1, %2, %0" : "+r"(rt) : "r"(ra), "r"(rb));
  72
  73 /* signed 16x16 -> 32 multiply */
  74 #   define MUL16 MUL16
  75 static inline av_const int MUL16(int ra, int rb)
  76 {
  77     int rt;
  78     __asm__ ("smulbb %0, %1, %2" : "=r"(rt) : "r"(ra), "r"(rb));
  79     return rt;
  80 }
  81
  82 #endif
  83
  84 #define mid_pred mid_pred
  85 static inline av_const int mid_pred(int a, int b, int c)
  86 {
  87     int m;
  88     __asm__ (
  89         "mov   %0, %2  \n\t"
  90         "cmp   %1, %2  \n\t"
  91         "itt   gt      \n\t"
  92         "movgt %0, %1  \n\t"
  93         "movgt %1, %2  \n\t"
  94         "cmp   %1, %3  \n\t"
  95         "it    le      \n\t"
  96         "movle %1, %3  \n\t"
  97         "cmp   %0, %1  \n\t"
  98         "it    gt      \n\t"
  99         "movgt %0, %1  \n\t"
 100         : "=&r"(m), "+r"(a)
 101         : "r"(b), "r"(c)
 102         : "cc");
 103     return m;
 104 }
 105
 106 #endif /* HAVE_INLINE_ASM */
 107
 108 #endif /* AVCODEC_ARM_MATHOPS_H */