> If you have some piece of code in a different security context that conditionally executes a heavy instruction based on a decision made over some sensitive da

> If you have some piece of code in a different security context that conditionally executes a heavy instruction based on a decision made over some sensitive data, doesn't this provide a way to obtain information about that data? Yes. http://www.numberworld.org/blogs/2018_6_16_avx_spectre/ http://www.numberworld.org/blogs/2018_6_16_avx_spectre/