There will be cases for which it's not so, but every time recently that I can remember someone saying ifort/icc vectorizes some numerical code profitably, and g

There will be cases for which it's not so, but every time recently that I can remember someone saying ifort/icc vectorizes some numerical code profitably, and gfortran doesn't, and I had the code, I got GCC vectorizing it with equivalent flags. ifort defaults to incorrect behaviour for floating point (something like gcc -ffast-math). [Edit: As I now see it says in a sibling.]