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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. See0b1972d409,29c4c0886danddf215e5758for 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
/*
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* Copyright (c) 2010 Alexander Strange <astrange@ithinksw.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_X86_INTREADWRITE_H
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#define AVUTIL_X86_INTREADWRITE_H
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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#if HAVE_MMX
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#ifdef __SSE__
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#define AV_COPY128 AV_COPY128
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static av_always_inline void AV_COPY128(void *d, const void *s)
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{
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struct v {uint64_t v[2];};
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__asm__("movaps %1, %%xmm0 \n\t"
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"movaps %%xmm0, %0 \n\t"
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: "=m"(*(struct v*)d)
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: "m" (*(const struct v*)s)
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: "xmm0");
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}
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#endif /* __SSE__ */
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#ifdef __SSE2__
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#define AV_ZERO128 AV_ZERO128
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static av_always_inline void AV_ZERO128(void *d)
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{
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struct v {uint64_t v[2];};
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__asm__("pxor %%xmm0, %%xmm0 \n\t"
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"movdqa %%xmm0, %0 \n\t"
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: "=m"(*(struct v*)d)
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:: "xmm0");
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}
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#endif /* __SSE2__ */
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#endif /* HAVE_MMX */
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#endif /* AVUTIL_X86_INTREADWRITE_H */
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