optimization (was: Re: swap(x,y))

[kenny at m.cs.uiuc.edu]

>(I wonder if SIGN is used in any FORTRAN program outside a test suite :-)

You betcha, and it's used outside Fortran, also.  There's no nice way
to do this one simply, either; you *don't* want to do a multiply just
to copy a sign.

I just grepped for copysign in the 4.3BSD math library, and found
fifty-odd uses there alone.

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