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Subject: Re: [boost] Geometry and spatial indexes, my opinion
From: Joel Falcou (joel.falcou_at_[hidden])
Date: 2008-10-11 12:24:15

Mathias Gaunard a écrit :
> Isn't GCC supposed to implement loop vectorization?
> Did you add in there SIMD instructions or not?

"Supposed" is the keyword. gcc 4.4 has a -Ox optimization that tries to
SIMD code but
when the basic block starts to get too long or too complex, it stops.
For loop unrolling, it should be
done automagically if loop bounds are statically known, if not, do it

Joel Falcou - Assistant Professor
PARALL Team - LRI - Universite Paris Sud XI
Tel : (+33)1 69 15 66 35

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