Path: utzoo!attcan!uunet!dino!ux1.cso.uiuc.edu!uxc.cso.uiuc.edu!uxc.cso.uiuc.edu!m.cs.uiuc.edu!kenny
From: kenny@m.cs.uiuc.edu
Newsgroups: comp.lang.c
Subject: Re: optimization (was: Re: swap(x,y))
Message-ID: <4700045@m.cs.uiuc.edu>
Date: 22 Sep 89 23:23:28 GMT
References: <14357@bloom-beacon.MIT.EDU>
Lines: 17
Nf-ID: #R:bloom-beacon.MIT.EDU:14357:m.cs.uiuc.edu:4700045:000:746
Nf-From: m.cs.uiuc.edu!kenny    Sep 22 12:21:00 1989


>(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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