Author: Dieter Buerssner
Date: 13:39:58 09/28/03
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On September 27, 2003 at 20:22:21, Johan de Koning wrote: >The following two expressions generate different addresses. > >base + (size * zob_lo >> 32) * sizeof(entry) // original trick >base + (size * sizeof(entry) * zob_lo >> 32) // optimized but wrong You are right. I stand corrected. No idea, what I had thought. Sorry for the confusion, and thanks for pointing out my error. The "optimized" trick can work with sizeof entry a power of two by anding a mask (~(sizeof(entry) - 1)) to the offset. But in this case adress calculation from the index is fast anyway (will at most need a shift, if anything). Regards, Dieter
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