mirror of
https://github.com/FFmpeg/FFmpeg.git
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9564375dee
The code has undefined behavior and makes no difference when optimizations are enabled. Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
111 lines
3.0 KiB
C
111 lines
3.0 KiB
C
/*
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* Copyright (c) 2008 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_PPC_INTREADWRITE_H
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#define AVUTIL_PPC_INTREADWRITE_H
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#include <stdint.h>
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#include "config.h"
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#if HAVE_XFORM_ASM
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#if HAVE_BIGENDIAN
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#define AV_RL16 av_read_bswap16
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#define AV_WL16 av_write_bswap16
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#define AV_RL32 av_read_bswap32
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#define AV_WL32 av_write_bswap32
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#define AV_RL64 av_read_bswap64
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#define AV_WL64 av_write_bswap64
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#else
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#define AV_RB16 av_read_bswap16
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#define AV_WB16 av_write_bswap16
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#define AV_RB32 av_read_bswap32
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#define AV_WB32 av_write_bswap32
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#define AV_RB64 av_read_bswap64
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#define AV_WB64 av_write_bswap64
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#endif
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static av_always_inline uint16_t av_read_bswap16(const void *p)
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{
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uint16_t v;
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__asm__ ("lhbrx %0, %y1" : "=r"(v) : "Z"(*(const uint16_t*)p));
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return v;
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}
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static av_always_inline void av_write_bswap16(void *p, uint16_t v)
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{
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__asm__ ("sthbrx %1, %y0" : "=Z"(*(uint16_t*)p) : "r"(v));
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}
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static av_always_inline uint32_t av_read_bswap32(const void *p)
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{
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uint32_t v;
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__asm__ ("lwbrx %0, %y1" : "=r"(v) : "Z"(*(const uint32_t*)p));
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return v;
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}
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static av_always_inline void av_write_bswap32(void *p, uint32_t v)
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{
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__asm__ ("stwbrx %1, %y0" : "=Z"(*(uint32_t*)p) : "r"(v));
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}
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#if HAVE_LDBRX
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static av_always_inline uint64_t av_read_bswap64(const void *p)
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{
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uint64_t v;
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__asm__ ("ldbrx %0, %y1" : "=r"(v) : "Z"(*(const uint64_t*)p));
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return v;
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}
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static av_always_inline void av_write_bswap64(void *p, uint64_t v)
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{
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__asm__ ("stdbrx %1, %y0" : "=Z"(*(uint64_t*)p) : "r"(v));
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}
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#else
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static av_always_inline uint64_t av_read_bswap64(const void *p)
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{
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union { uint64_t v; uint32_t hl[2]; } v;
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__asm__ ("lwbrx %0, %y2 \n\t"
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"lwbrx %1, %y3 \n\t"
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: "=&r"(v.hl[1]), "=r"(v.hl[0])
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: "Z"(*(const uint32_t*)p), "Z"(*((const uint32_t*)p+1)));
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return v.v;
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}
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static av_always_inline void av_write_bswap64(void *p, uint64_t v)
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{
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union { uint64_t v; uint32_t hl[2]; } vv = { v };
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__asm__ ("stwbrx %2, %y0 \n\t"
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"stwbrx %3, %y1 \n\t"
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: "=Z"(*(uint32_t*)p), "=Z"(*((uint32_t*)p+1))
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: "r"(vv.hl[1]), "r"(vv.hl[0]));
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}
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#endif /* HAVE_LDBRX */
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#endif /* HAVE_XFORM_ASM */
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#endif /* AVUTIL_PPC_INTREADWRITE_H */
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