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Andreas Rheinhardt
2d3776b8cc
This fallback function is used if external MMX is available, while inline MMX and intrinsics for emitting emms are unavailable. It is implemented as an avpriv function, which has several drawbacks for shared builds: 1. The function is so small (3 bytes; 16 with padding) that the overhead of exporting and importing it dwarfs the gains from code deduplication. 2. A call to an external library has more overhead than a library-internal one. 3. It may cause linking failures when a libavutil not exporting avpriv_emms_asm() is paired with a library needing it (if inline assembly and intrinsics were unavailable when building the dependent library). I am not aware of this ever happening. 4. We would be forced to keep avpriv_emms_asm() around for ABI stability even after it is no longer needed. This commit therefore uses the STLIBOBJS, SHLIBOBJS approach to duplicating it into each library on its own if needed. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
20 lines
950 B
NASM
20 lines
950 B
NASM
;*****************************************************************************
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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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%include "libavutil/x86/emms.asm"
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