fenv implementation for POWERPC

[Eshan Dhawan]

hello everyone,
For porting fenv.h to POWERPC I went to FreeBSD and NetBSD They both have
the same implementation.
But musl has a different implementation following the same structure as in
previous implementations.
Which would be better??

FreeBSD: https://github.com/freebsd/freebsd/tree/master/lib/msun/powerpc
NetBSD:-
-> fenv.c :
https://github.com/NetBSD/src/blob/trunk/lib/libm/arch/powerpc/fenv.c
->fenv.h :
https://github.com/NetBSD/src/blob/trunk/sys/arch/powerpc/include/fenv.h
musl: https://git.musl-libc.org/cgit/musl/tree/src/fenv/powerpc64

thanks
eshan
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