7ec2354c38
These inline implementations of AV_COPY64, AV_SWAP64 and AV_ZERO64 are known to clobber the FPU state - which has to be restored with the 'emms' instruction afterwards. This was known and signaled with the FF_COPY_SWAP_ZERO_USES_MMX define, which calling code seems to have been supposed to check, in order to call emms_c() after using them. See 0b1972d4096df5879038f0af776f87f41e90ebd4, 29c4c0886d143790fcbeddbe40a23dfc6f56345c and df215e575850e41b19aeb1fd99e53372a6b3d537 for history on earlier fixes in the same area. However, new code can use these AV_*64() macros without knowing about the need to call emms_c(). Just get rid of these dangerous inline assembly snippets; this doesn't make any difference for 64 bit architectures anyway. Signed-off-by: Martin Storsjö <martin@martin.st>
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
/*
|
|
* Copyright (c) 2010 Alexander Strange <astrange@ithinksw.com>
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#ifndef AVUTIL_X86_INTREADWRITE_H
|
|
#define AVUTIL_X86_INTREADWRITE_H
|
|
|
|
#include <stdint.h>
|
|
#include "config.h"
|
|
#include "libavutil/attributes.h"
|
|
|
|
#if HAVE_MMX
|
|
|
|
#ifdef __SSE__
|
|
|
|
#define AV_COPY128 AV_COPY128
|
|
static av_always_inline void AV_COPY128(void *d, const void *s)
|
|
{
|
|
struct v {uint64_t v[2];};
|
|
|
|
__asm__("movaps %1, %%xmm0 \n\t"
|
|
"movaps %%xmm0, %0 \n\t"
|
|
: "=m"(*(struct v*)d)
|
|
: "m" (*(const struct v*)s)
|
|
: "xmm0");
|
|
}
|
|
|
|
#endif /* __SSE__ */
|
|
|
|
#ifdef __SSE2__
|
|
|
|
#define AV_ZERO128 AV_ZERO128
|
|
static av_always_inline void AV_ZERO128(void *d)
|
|
{
|
|
struct v {uint64_t v[2];};
|
|
|
|
__asm__("pxor %%xmm0, %%xmm0 \n\t"
|
|
"movdqa %%xmm0, %0 \n\t"
|
|
: "=m"(*(struct v*)d)
|
|
:: "xmm0");
|
|
}
|
|
|
|
#endif /* __SSE2__ */
|
|
|
|
#endif /* HAVE_MMX */
|
|
|
|
#endif /* AVUTIL_X86_INTREADWRITE_H */
|