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    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
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Sur d’autres sites (7952)

  • libFLAC/cpu.c : Simplify OS SSE support detection.

    28 juillet 2014, par Erik de Castro Lopo
    libFLAC/cpu.c : Simplify OS SSE support detection.

    Simplify the code that tries to detect whether OS supports SSE instructions.
    

    a) Linux : "old" vs "new" sigaction
    

    OBSOLETE_SIGCONTEXT_FLAVOR was disabled in Mar 2007 in commit 1ca3a445f.
    
According to <http://unixhelp.ed.ac.uk/CGI/man-cgi?sigaction>: "Support for
    
SA_SIGINFO was added in Linux 2.2" (released in Jan 1999). If noone wants to
    
use FLAC with Linux kernel 2.0 then it’s safe to delete this code.
    

    b) MSVC : try/catch vs. sigill_handler
    

    TRY_CATCH_FLAVOR was enabled in Jan 2009 in commit a832ef32. According to the
    
comment in cpu.c, "sigill_handler flavor resulted in several crash reports on
    
win32". Also this sigill_handler flavor is not thread-safe.
    

    c) MinGW : fxsave/fxrestore vs. sigill_handler
    

    The code was added Mar 2014 in commit 99d5154f. It’s better to use FXSR flavor
    
instead of sigill_handler flavor. The reasons are the same as for MSVC.
    

    Patch-from : lvqcl <lvqcl.mail@gmail.com>
    • [DH] src/libFLAC/cpu.c

  • libFLAC : SSE optimisations.

    28 juillet 2014, par Erik de Castro Lopo
    libFLAC : SSE optimisations.

    Add new function :
    

        FLAC__lpc_compute_residual_from_qlp_coefficients_intrin_sse41()
    

    and rewrite function :
    

        FLAC__lpc_compute_residual_from_qlp_coefficients_16_intrin_sse2()
    

    Testing shows noticeable speed increase on Intel Core i3/5/7 (up to 30%
    
for -8 mode), AMD Athlon64, Phenom, Bulldozer/Piledriver, but no increase
    
or even very small speed decrease ( 2% for -8 mode) on Intel Core2.
    

    Patch-from : lvqcl <lvqcl.mail@gmail.com>
    • [DH] src/libFLAC/include/private/lpc.h
    • [DH] src/libFLAC/lpc_intrin_sse2.c
    • [DH] src/libFLAC/lpc_intrin_sse41.c
    • [DH] src/libFLAC/stream_encoder.c

  • include/share/endswap.h : Improvements to fallthrough ENDSWAP_*.

    9 août 2014, par Erik de Castro Lopo
    include/share/endswap.h : Improvements to fallthrough ENDSWAP_*.

    According to patch author GCC can optimize expressions like
    
"(a<<8)|(a>>8)", but has problems with "(a<<8)+(a>>8)".
    

    Patch-from : lvqcl <lvqcl.mail@gmail.com>
    • [DH] include/share/endswap.h

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