Date: Sat, 30 Aug 2003 20:48:54 +0200
From: "Eli Zaretskii" <eliz AT elta DOT co DOT il>
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To: Kbwms AT aol DOT com
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In-reply-to: <114.2823ab81.2c822fce@aol.com> (Kbwms@aol.com)
Subject: Re: Arithmetic Exceptions in C99
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> From: Kbwms AT aol DOT com
> Date: Sat, 30 Aug 2003 12:50:22 EDT
> 
> Has anyone bothered to look at the source for libm.a to see what they do?
> I see expressions like (x-x)/(x-x) to produce a NaN and turn on the
> floating point invalid exception and "huge + x" (where huge =3D 1.0e30)
> to turn on the floating point inexact exception.  In the log function 
> is "-two54/zero" to turn on the floating point divide-by-zero exception
> and generate -infinity.

All these tricks will trigger SIGFPE unless we force the x87 to
suppress exceptions.