>>I think this patch by Zdenek - vectorizing function calls - is related: >> http://gcc.gnu.org/ml/gcc-patches/2006-03/msg01655.html >> (would need to be extended to cover this case).
Yes, extending Zdenek's patch to recognize built-in is a good idea. However, in case of compiler inserted built-in (e.g. this case) it is a good idea to delay inserting built-in function calls after vectorizer has a chance to optimize loop, specially when vectorized version of built-in function is not available. - Devang
