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setjmp in newlib and glibc


Hello,
setjmp in glibc  (glibc-2.3.2 ) internally calls sigsetjmp().
How the  floating point environment getting stored there.

Why is it required ? Is there a specific reason for doing so ? What is the logic behind making it a macro ?

Whereas Newlibs setjmp() implementation is straight forward.

Could anyone tell me the reason behind implementing the same?

Thanks for the help.


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