Linked by ebasconp on Fri 10th Jun 2011 22:22 UTC
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Member since:
2011-04-11
i--;
a[i] += b[i];
}
I'm pretty sure this is a terrible idea because it will mess up all the cache lines and pre-fetching if you walk through memory backwards. "
No. Prefetchers (in every processor I've touched) support negative strides and working backwards have no performance problems.