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Sur d’autres sites (11195)

  • x86inc : AVX-512 support

    25 mars 2017, par Henrik Gramner
    x86inc : AVX-512 support

    AVX-512 consists of a plethora of different extensions, but in order to keep
    
things a bit more manageable we group together the following extensions
    
under a single baseline cpu flag which should cover SKL-X and future CPUs :
    
 * AVX-512 Foundation (F)
    
 * AVX-512 Conflict Detection Instructions (CD)
    
 * AVX-512 Byte and Word Instructions (BW)
    
 * AVX-512 Doubleword and Quadword Instructions (DQ)
    
 * AVX-512 Vector Length Extensions (VL)
    

    On x86-64 AVX-512 provides 16 additional vector registers, prefer using
    
those over existing ones since it allows us to avoid using `vzeroupper`
    
unless more than 16 vector registers are required. They also happen to
    
be volatile on Windows which means that we don't need to save and restore
    
existing xmm register contents unless more than 22 vector registers are
    
required.
    

    Big thanks to Intel for their support.
    • [DH] libavutil/x86/x86inc.asm

  • avcodec/mips : Improve hevc uni weighted vert mc msa functions

    11 octobre 2017, par Kaustubh Raste
    avcodec/mips : Improve hevc uni weighted vert mc msa functions

    Pack the data to half word before clipping.
    
Use immediate unsigned saturation for clip to max saving one vector register.
    

    Signed-off-by : Kaustubh Raste <kaustubh.raste@imgtec.com>
    
Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavcodec/mips/hevc_mc_uniw_msa.c

  • avcodec/dca_parser : improve frame end search

    13 mai 2016, par foo86
    avcodec/dca_parser : improve frame end search

    Parse core frame size directly when searching for frame end instead of
    
using value extracted from previous frame.
    

    Account for unused bits when calculating sync word distance for 14-bit
    
streams to avoid alias sync detection.
    

    Parse EXSS frame size and skip over EXSS frame to avoid alias sync
    
detection.
    

    Signed-off-by : James Almer <jamrial@gmail.com>
    • [DH] libavcodec/dca_parser.c

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