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x86: Add a Yasm-based emms() replacement 

This provides a fallback when building with Yasm enabled, but neither
inline assembly, nor the _mm_empty intrinsic are available or enabled.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
This commit is contained in:
Martin Storsjö 2013-01-09 22:57:41 +02:00 committed by Diego Biurrun
parent d633d12b2c
commit f4facd2ce7
4 changed files with 58 additions and 0 deletions
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3
libavutil/internal.h
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@ -141,6 +141,9 @@ static av_always_inline void emms_c(void)
#elif HAVE_MMX && HAVE_MM_EMPTY
# include <mmintrin.h>
# define emms_c _mm_empty
#elif HAVE_MMX && HAVE_YASM
# include "libavutil/x86/emms.h"
# define emms_c avpriv_emms_yasm
#else
# define emms_c()
#endif /* HAVE_MMX_INLINE */

1
libavutil/x86/Makefile
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@ -2,4 +2,5 @@ OBJS += x86/cpu.o \
x86/float_dsp_init.o \
YASM-OBJS += x86/cpuid.o \
x86/emms.o \
x86/float_dsp.o \

30
libavutil/x86/emms.asm Normal file
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@ -0,0 +1,30 @@
;*****************************************************************************
;* Copyright (C) 2013 Martin Storsjo
;*
;* 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
;******************************************************************************
%include "x86util.asm"
SECTION .text
;-----------------------------------------------------------------------------
; void avpriv_emms_yasm(void)
;-----------------------------------------------------------------------------
cvisible emms_yasm, 0, 0
emms
RET

24
libavutil/x86/emms.h Normal file
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@ -0,0 +1,24 @@
/*
* 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_X86_EMMS_H
#define AVUTIL_X86_EMMS_H
void avpriv_emms_yasm(void);
#endif /* AVUTIL_X86_EMMS_H */