• Christophe Gisquet's avatar
    dcadec: simplify decoding of VQ high frequencies · 4cb69642
    Christophe Gisquet authored
    The vector dequantization has a test in a loop preventing effective SIMD
    implementation. By moving it out of the loop, this loop can be DSPized.
    
    Therefore, modify the current DSP implementation. In particular, the
    DSP implementation no longer has to handle null loop sizes.
    
    The decode_hf implementations have following timings:
    
    For x86 Arrandale:
            C  SSE SSE2 SSE4
    win32: 260 162  119  104
    win64: 242 N/A   89   72
    
    The arm NEON optimizations follow in a later patch as external asm. The
    now unused check for the y modifier in arm inline asm is removed from
    configure.
    4cb69642
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