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WRT the rest of the discussion, I'd like to point out that -O3 -ftree-vectorize currently ICEs on a few testcases (PR30087), which is
Does this patch fix the problem?: http://gcc.gnu.org/ml/gcc/2006-12/msg00267.html
To overcome the problem Andrew mentions here - http://gcc.gnu.org/ml/gcc-patches/2006-12/msg00532.html, you can look at how gcc.dg/vect/vect.exp computes which target options to use with -ftree-vectorize.
Thanks, - Tobi
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