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...ly give a marginal improvement (5% or so). Note that no loop unrolling has been done; for the direct case unrolling 4 times will reduce instruction count noticeably. Using '-ftree-vectorize -ffast-math -O3' and a profile run: Original: Direct 3419k, Interpolate 9255k This version: Direct 1629k, Interpolate 8588k My loop transformations allow GCC to recognize it as vectorizable for the direct case, giving a very nice speedup. For interpolate, we're again hurt by the loop doing too much work. Note though that GCC currently does not vectorize the inner loop for interpolate as it'...