[Cfp-interest] functions - fesetexcept implementable on x87?

[David Hough CFP]

Sounds like x87 can have a very efficient implementation of signaling 
exception to offset its inefficient raising of flags.
However most x86 systems intended for technical computation since 2003
or so have had sse2 extensions.
In any case I think the raising of x87 flags without sse2
can probably be made reasonably
efficient if the image is maintained in software.