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    • Janne Grunau's avatar
      ppc: reduce overreads when loading 8 pixels in altivec dsp functions · 98fdfa99
      Janne Grunau authored
      Altivec can only load naturally aligned vectors. To handle possibly
      unaligned data a second vector is loaded from an offset of the original
      location and the data is recovered through a vector permutation.
      Overreads are minimal if the offset for second load points to the last
      element of data. This is 7 for loading eight 8-bit pixels and overreads
      are reduced from 16 bytes to 8 bytes if the pixels are 64-bit aligned.
      For unaligned pixels the overread is reduced from 23 bytes to 15 bytes
      in the worst case.
      98fdfa99
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