1
0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-11-26 19:01:44 +02:00
FFmpeg/libavutil/mips/intreadwrite.h
Vicente Olivert Riera d00bb8addc mips: intreadwrite: Only execute that code for mips r1 or r2
MIPS R6 supports unaligned memory access and does not have
the load/store-left/right family of instructions.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera at imgtec.com>
Signed-off-by: Luca Barbato <lu_zero at gentoo.org>
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>
2015-09-29 11:10:37 +02:00

53 lines
1.7 KiB
C

/*
* Copyright (c) 2009 Mans Rullgard <mans@mansr.com>
*
* This file is part of Libav.
*
* Libav is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* Libav is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVUTIL_MIPS_INTREADWRITE_H
#define AVUTIL_MIPS_INTREADWRITE_H
#include <stdint.h>
#include "config.h"
/*
* GCC actually handles unaligned accesses correctly in all cases
* except, absurdly, 32-bit loads on mips64.
*
* https://git.libav.org/?p=libav.git;a=commit;h=b82b49a5b774b6ad9119e981c72b8f594fee2ae0
*/
#if HAVE_MIPS64R2_INLINE || HAVE_MIPS64R1_INLINE
#define AV_RN32 AV_RN32
static av_always_inline uint32_t AV_RN32(const void *p)
{
struct __attribute__((packed)) u32 { uint32_t v; };
const uint8_t *q = p;
const struct u32 *pl = (const struct u32 *)(q + 3 * !HAVE_BIGENDIAN);
const struct u32 *pr = (const struct u32 *)(q + 3 * HAVE_BIGENDIAN);
uint32_t v;
__asm__ ("lwl %0, %1 \n\t"
"lwr %0, %2 \n\t"
: "=&r"(v)
: "m"(*pl), "m"(*pr));
return v;
}
#endif /* HAVE_MIPS64R2_INLINE || HAVE_MIPS64R1_INLINE */
#endif /* AVUTIL_MIPS_INTREADWRITE_H */