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/libavutil/ppc/intreadwrite.h

http://github.com/FFmpeg/FFmpeg
C Header | 110 lines | 72 code | 19 blank | 19 comment | 0 complexity | 25461a3315d95aa20273c016ad5a11c0 MD5 | raw file
  1/*
  2 * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
  3 *
  4 * This file is part of FFmpeg.
  5 *
  6 * 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.
 10 *
 11 * 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
 14 * Lesser General Public License for more details.
 15 *
 16 * You should have received a copy of the GNU Lesser General Public
 17 * License along with FFmpeg; if not, write to the Free Software
 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 19 */
 20
 21#ifndef AVUTIL_PPC_INTREADWRITE_H
 22#define AVUTIL_PPC_INTREADWRITE_H
 23
 24#include <stdint.h>
 25#include "config.h"
 26
 27#if HAVE_XFORM_ASM
 28
 29#if HAVE_BIGENDIAN
 30#define AV_RL16 av_read_bswap16
 31#define AV_WL16 av_write_bswap16
 32#define AV_RL32 av_read_bswap32
 33#define AV_WL32 av_write_bswap32
 34#define AV_RL64 av_read_bswap64
 35#define AV_WL64 av_write_bswap64
 36
 37#else
 38#define AV_RB16 av_read_bswap16
 39#define AV_WB16 av_write_bswap16
 40#define AV_RB32 av_read_bswap32
 41#define AV_WB32 av_write_bswap32
 42#define AV_RB64 av_read_bswap64
 43#define AV_WB64 av_write_bswap64
 44
 45#endif
 46
 47static av_always_inline uint16_t av_read_bswap16(const void *p)
 48{
 49    uint16_t v;
 50    __asm__ ("lhbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint16_t*)p));
 51    return v;
 52}
 53
 54static av_always_inline void av_write_bswap16(void *p, uint16_t v)
 55{
 56    __asm__ ("sthbrx  %1, %y0" : "=Z"(*(uint16_t*)p) : "r"(v));
 57}
 58
 59static av_always_inline uint32_t av_read_bswap32(const void *p)
 60{
 61    uint32_t v;
 62    __asm__ ("lwbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
 63    return v;
 64}
 65
 66static av_always_inline void av_write_bswap32(void *p, uint32_t v)
 67{
 68    __asm__ ("stwbrx  %1, %y0" : "=Z"(*(uint32_t*)p) : "r"(v));
 69}
 70
 71#if HAVE_LDBRX
 72
 73static av_always_inline uint64_t av_read_bswap64(const void *p)
 74{
 75    uint64_t v;
 76    __asm__ ("ldbrx   %0, %y1" : "=r"(v) : "Z"(*(const uint64_t*)p));
 77    return v;
 78}
 79
 80static av_always_inline void av_write_bswap64(void *p, uint64_t v)
 81{
 82    __asm__ ("stdbrx  %1, %y0" : "=Z"(*(uint64_t*)p) : "r"(v));
 83}
 84
 85#else
 86
 87static av_always_inline uint64_t av_read_bswap64(const void *p)
 88{
 89    union { uint64_t v; uint32_t hl[2]; } v;
 90    __asm__ ("lwbrx   %0, %y2  \n\t"
 91             "lwbrx   %1, %y3  \n\t"
 92             : "=&r"(v.hl[1]), "=r"(v.hl[0])
 93             : "Z"(*(const uint32_t*)p), "Z"(*((const uint32_t*)p+1)));
 94    return v.v;
 95}
 96
 97static av_always_inline void av_write_bswap64(void *p, uint64_t v)
 98{
 99    union { uint64_t v; uint32_t hl[2]; } vv = { v };
100    __asm__ ("stwbrx  %2, %y0  \n\t"
101             "stwbrx  %3, %y1  \n\t"
102             : "=Z"(*(uint32_t*)p), "=Z"(*((uint32_t*)p+1))
103             : "r"(vv.hl[1]), "r"(vv.hl[0]));
104}
105
106#endif /* HAVE_LDBRX */
107
108#endif /* HAVE_XFORM_ASM */
109
110#endif /* AVUTIL_PPC_INTREADWRITE_H */