23.2.1. Potential or actual exception that the VFP11 coprocessor
cannot handle
Three exceptional conditions cannot be handled by the VFP11 hardware:
an operation that might underflow when the VFP11 coprocessor
is not in flush-to-zero mode
an operation involving a subnormal operand when
the VFP11 coprocessor is not in flush-to-zero mode
an operation involving a NaN when the VFP11 coprocessor
is not in default NaN mode.
For these conditions the VFP11 coprocessor relies on
support code to process the operation. See Underflow exception and Input exceptions.
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