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The ARM C and C++ libraries
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Libraries and Floating Point Support Guide
The floating-point status word in a multithreaded environment
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| Home > The ARM C and C++ libraries > The floating-point status word in a multithreaded environment | |||
Applicable to variants of the software floating-point libraries
that require a status word (--fpmode=ieee_fixed or --fpmode=ieee_full),
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 __user_perthread_libspace block.
Note
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.
See also- Concepts
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| Copyright © 2007-2008, 2011-2012 ARM. All rights reserved. | ARM DUI 0378D |
| Non-Confidential | ID062912 |
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| Home > The ARM C and C++ libraries > The floating-point status word in a multithreaded environment |
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