Scope of MXCSR control register?

[tran_l_]

scope of MXCSR control register is scope of thread, is it?

That it mean:

Default FTZ is OFF.

Thread A set FTZ to ON. After that, in all others threads, FTZ is still OFF.

I refer to link: http://stackoverflow.com/questions/4948057/scope-of-mxcsr-control-register

[Roman_D_Intel]

Hi tran I.

You are right, MXCSR register is a part of architectural register state of a (logical) core. See volume 1 chapter 10.2 (SSE programming environment) in Intel Architectures Software Development manual for details.

Thanks,

Roman