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FFmpeg/libavutil/mips/intreadwrite.h
Mans Rullgard 6766169c41 mips: intreadwrite: fix inline asm for gcc 4.8
Just like gcc 4.6 and later on ARM, gcc 4.8 on MIPS generates
inefficient code when a known-unaligned location is used as a
memory input operand.  This applies the same fix as has been
previously done to the ARM version of the code.

Signed-off-by: Mans Rullgard <mans@mansr.com>
2012-05-09 13:45:22 +01:00

47 lines
1.5 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"
#if ARCH_MIPS64 && HAVE_INLINE_ASM
#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 /* ARCH_MIPS64 && HAVE_INLINE_ASM */
#endif /* AVUTIL_MIPS_INTREADWRITE_H */