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Re: Optimising std::find on x86 and PPC
Paolo Carlini wrote:
Paolo Carlini wrote:
Besided what Gaby and Benjamin already replied, out of curiosity,
what the loop
unroller is doing, right now?!? Nothing!?!
More explicitly, and in the "right" spirit for the library: let's
suppose we remove completely any ad-hoc loop-unrolling by hand, can we
trust the loop-unroller to do a decent work both on x86-linux and
darwin-powerpc? This is something worth
investigating, IMHO... and in case the loop unroller does crazy things
file immediately a PR.
Only one minor point on this.. in 4.0, we really either need our
unrolled code, or a better loop optimiser unless we want to take a 40%
speed hit on std::find... so if we remove it and they can't get the loop
optimiser fixed, either the current version or (I'd perfer, but won't
force) the new version I originally posted should go back in.
Chris