Will AVX support be automatic in the Intel C and Fortran compilers? That is, if you set the correct command line options in the compile command, will the Intel compilers automatically AVXify the executable, the way that they currently do automatic SSE* vectorization?
Yes, there are -QxAVX options in Intel compilers beginning with current 11.1. Both scalar and parallel AVX instructions are used, and there are a few cases which become auto-vectorizable for the first time. More about this subject has appeared in the past on the AVX forum.