On Sat, Apr 12, 2008 at 5:19 PM, H.J. Lu <hjl.tools@gmail.com> wrote: > vzeroall isn't used for correctness. It is used for performance when an > AVX function is called from an SSE function. We can not optimize out > vzeroall if any SSE registers are used. Can you perhaps post an illustrative example for this? Thanks, Uros.