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Subnormal floating-point numbers are expensive on Intel processors

69 points · 54 comments · zdw

  1. juancn · · focus · HN ↗
    Apparently it only happens on P-cores, recent E-cores have a fast path for subnormals.
    1. rustybolt · · focus · HN ↗
      That seems weird. They did throw extra hardware at it to speed it up for the efficient cores, but not for the performance cores?
      1. gpderetta · · focus · HN ↗
        larger SIMD ALUs, which also have been around for longer?
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