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libavutil/arm/intmath.h
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/*
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 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVUTIL_ARM_INTMATH_H
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#define AVUTIL_ARM_INTMATH_H
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#include "config.h"
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#include "libavutil/common.h"
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#if HAVE_INLINE_ASM
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#if HAVE_ARMV6
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static inline av_const int FASTDIV(int a, int b)
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{
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    int r, t;
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    __asm__ volatile("cmp     %3, #2               \n\t"
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                     "ldr     %1, [%4, %3, lsl #2] \n\t"
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                     "lsrle   %0, %2, #1           \n\t"
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                     "smmulgt %0, %1, %2           \n\t"
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                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
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    return r;
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}
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#else
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static inline av_const int FASTDIV(int a, int b)
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{
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    int r, t;
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    __asm__ volatile("umull %1, %0, %2, %3"
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                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
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    return r;
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}
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#endif
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#define FASTDIV FASTDIV
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#endif /* HAVE_INLINE_ASM */
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#endif /* AVUTIL_ARM_INTMATH_H */
libavutil/internal.h
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/* math */
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extern const uint32_t ff_inverse[257];
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#if ARCH_X86
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#    define FASTDIV(a,b) \
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    ({\
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        int ret, dmy;\
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        __asm__ volatile(\
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            "mull %3"\
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            :"=d"(ret), "=a"(dmy)\
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            :"1"(a), "g"(ff_inverse[b])\
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            );\
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        ret;\
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    })
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#elif HAVE_ARMV6 && HAVE_INLINE_ASM
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static inline av_const int FASTDIV(int a, int b)
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{
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    int r, t;
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    __asm__ volatile("cmp     %3, #2               \n\t"
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                     "ldr     %1, [%4, %3, lsl #2] \n\t"
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                     "lsrle   %0, %2, #1           \n\t"
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                     "smmulgt %0, %1, %2           \n\t"
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                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(b), "r"(ff_inverse));
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    return r;
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}
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#elif ARCH_ARM && HAVE_INLINE_ASM
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static inline av_const int FASTDIV(int a, int b)
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{
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    int r, t;
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    __asm__ volatile("umull %1, %0, %2, %3"
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                     : "=&r"(r), "=&r"(t) : "r"(a), "r"(ff_inverse[b]));
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    return r;
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}
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#elif CONFIG_FASTDIV
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#    define FASTDIV(a,b)   ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
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#else
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#    define FASTDIV(a,b)   ((a) / (b))
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#endif
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extern const uint8_t ff_sqrt_tab[256];
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static inline av_const unsigned int ff_sqrt(unsigned int a)
libavutil/intmath.h
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#include "config.h"
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#include "common.h"
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extern const uint32_t ff_inverse[257];
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#if   ARCH_ARM
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#   include "arm/intmath.h"
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#elif ARCH_X86
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#   include "x86/intmath.h"
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#endif
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#if HAVE_FAST_CLZ && AV_GCC_VERSION_AT_LEAST(3,4)
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#ifndef av_log2
......
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#endif /* AV_GCC_VERSION_AT_LEAST(3,4) */
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#ifndef FASTDIV
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#if CONFIG_FASTDIV
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#    define FASTDIV(a,b)   ((uint32_t)((((uint64_t)a) * ff_inverse[b]) >> 32))
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#else
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#    define FASTDIV(a,b)   ((a) / (b))
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#endif
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#endif /* FASTDIV */
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#endif /* AVUTIL_INTMATH_H */
libavutil/x86/intmath.h
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/*
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 * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
7
 * modify it under the terms of the GNU Lesser General Public
8
 * License as published by the Free Software Foundation; either
9
 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
12
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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#ifndef AVUTIL_X86_INTMATH_H
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#define AVUTIL_X86_INTMATH_H
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#include "libavutil/common.h"
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#define FASTDIV(a,b) \
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    ({\
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        int ret, dmy;\
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        __asm__ volatile(\
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            "mull %3"\
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            :"=d"(ret), "=a"(dmy)\
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            :"1"(a), "g"(ff_inverse[b])\
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            );\
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        ret;\
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    })
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#endif /* AVUTIL_X86_INTMATH_H */

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