title: Scope of MXCSR control register?
body: <p>I'm wondering what is the <strong>lifetime of the value stored in the MXCSR control register</strong> (including FTZ and DAZ config for denormal floating-point numbers): is it in the scope of the thread, or is it common for all processing on the CPU/FPU?</p>
  
  <p>What I want to know is if I need to set it (MXCSR) at my needs at the beginning of each thread of a thread pool, or once in the app, or would it impact everything else in the app and/or the system?</p>
  
  <p>Thanks for any help!</p>