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ASE: mathutils.hh: improve fast_log2, add fast_log2_block #64

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ASE: mathutils.hh: improve fast_log2, add fast_log2_block #64

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  • avoid using a union in fast_log2 (fix undefined behaviour)
  • make code auto vectorizable by gcc
  • add a block version for fast_log2 (should be auto vectorized)
  • assume sign bit == 0, makex exponent extraction easier

@swesterfeld
ASE: mathutils.hh: improve fast_log2, add fast_log2_block
1067f26 
 - avoid using a union in fast_log2 (fix undefined behaviour)
 - make code auto vectorizable by gcc
 - add a block version for fast_log2 (should be auto vectorized)
 - assume sign bit == 0, makes exponent extraction easier

Signed-off-by: Stefan Westerfeld <[email protected]>
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