Thanks a lot Michael for the detailed help! Thanks also n8tm, and sorry to have posted on the wrong list.
Well that's a lot of food for thought and it'll keep me busy for some time, so thanks again to all, and bye! Benoit On Monday 17 March 2008 20:08:43 Michael Meissner wrote: > However, SSE instructions need 128-bit alignment, not 64-bit alignment that > -malign-double would give. You can align the arrays yourself with the > __attribute__((__aligned__(16))) declaration, or use a union that has an > element with 16-byte alignment (vector element, such as __m128, __m128d, > __m128i or long double and -m128bit-long-double). Note, if the arrays are > auto rather than static, you probably need to use the -mstackrealign and > -mpreferred-stack-boundary=16 as well. > > It might be nice to think about an option that automatically aligns large > arrays without having to do the declaration (or even have the vectorizer > override the alignment for statics/auto).
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