What does auto-vectorization mean?? I think it must be converting 'for' loops which does not exploit SIMD features of a processor(say Pentium 4) to 'for' loops which exploit SIMD features(of course, it could be at any intermediate representation).
While (indexed) loops are the most obvious case, auto vectorisation actually applies to *any* code. Loops are easier to do than generic code, and you get a better gain from them, so that's where all the action is ;-) Segher
