Applicable to variants of the software floating-point libraries
that require a status word (
the floating-point status word is safe to use in a multithreaded
environment, even with software floating-point. A status word for
each thread is stored in its own
In a hardware floating-point environment, the floating-point status word is stored in a Vector Floating-Point (VFP) register. In this case, your thread-switching mechanism must keep a separate copy of this register for each thread.