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Add macros for 64- and 128-bit write-combining optimization to intreadwrite.h.
Add x86 implementation using MMX/SSE. Originally committed as revision 21281 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Alexander Strange
parent
3c52d4849f
commit
f6d0390657
@ -25,8 +25,9 @@
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/*
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* Arch-specific headers can provide any combination of
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* AV_[RW][BLN](16|24|32|64) macros. Preprocessor symbols must be
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* defined, even if these are implemented as inline functions.
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* AV_[RW][BLN](16|24|32|64) and AV_(COPY|SWAP|ZERO)(64|128) macros.
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* Preprocessor symbols must be defined, even if these are implemented
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* as inline functions.
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*/
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#if ARCH_ARM
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@ -37,6 +38,8 @@
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# include "mips/intreadwrite.h"
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#elif ARCH_PPC
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# include "ppc/intreadwrite.h"
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#elif ARCH_X86
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# include "x86/intreadwrite.h"
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#endif
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/*
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@ -397,4 +400,44 @@ struct unaligned_16 { uint16_t l; } __attribute__((packed));
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} while(0)
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#endif
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/* Parameters for AV_COPY*, AV_SWAP*, AV_ZERO* must be
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* naturally aligned. They may be implemented using MMX,
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* so emms_c() must be called before using any float code
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* afterwards.
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*/
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#define AV_COPY(n, d, s) (*(uint##n##_t*)(d) = *(const uint##n##_t*)(s))
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#ifndef AV_COPY64
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# define AV_COPY64(d, s) AV_COPY(64, d, s)
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#endif
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#ifndef AV_COPY128
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# define AV_COPY128(d, s) \
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do { \
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AV_COPY64(d, s); \
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AV_COPY64((char*)(d)+8, (char*)(s)+8); \
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} while(0)
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#endif
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#define AV_SWAP(n, a, b) FFSWAP(uint##n##_t, *(uint##n##_t*)(a), *(uint##n##_t*)(b))
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#ifndef AV_SWAP64
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# define AV_SWAP64(a, b) AV_SWAP(64, a, b)
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#endif
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#define AV_ZERO(n, d) (*(uint##n##_t*)(d) = 0)
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#ifndef AV_ZERO64
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# define AV_ZERO64(d) AV_ZERO(64, d)
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#endif
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#ifndef AV_ZERO128
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# define AV_ZERO128(d) \
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do { \
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AV_ZERO64(d); \
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AV_ZERO64((char*)(d)+8); \
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} while(0)
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#endif
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#endif /* AVUTIL_INTREADWRITE_H */
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96
libavutil/x86/intreadwrite.h
Normal file
96
libavutil/x86/intreadwrite.h
Normal file
@ -0,0 +1,96 @@
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/*
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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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#if HAVE_MMX
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#if !HAVE_FAST_64BIT && defined(__MMX__)
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#define AV_COPY64 AV_COPY64
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static av_always_inline void AV_COPY64(void *d, const void *s)
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{
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__asm__("movq %1, %%mm0 \n\t"
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"movq %%mm0, %0 \n\t"
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: "=m"(*(uint64_t*)d)
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: "m" (*(const uint64_t*)s)
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: "mm0");
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}
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#define AV_SWAP64 AV_SWAP64
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static av_always_inline void AV_SWAP64(void *a, void *b)
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{
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__asm__("movq %1, %%mm0 \n\t"
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"movq %0, %%mm1 \n\t"
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"movq %%mm0, %0 \n\t"
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"movq %%mm1, %1 \n\t"
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: "+m"(*(uint64_t*)a), "+m"(*(uint64_t*)b)
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::"mm0", "mm1");
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}
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#define AV_ZERO64 AV_ZERO64
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static av_always_inline void AV_ZERO64(void *d)
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{
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__asm__("pxor %%mm0, %%mm0 \n\t"
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"movq %%mm0, %0 \n\t"
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: "=m"(*(uint64_t*)d)
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:: "mm0");
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}
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#endif /* !HAVE_FAST_64BIT && defined(__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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