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From: lotto@wjh12.UUCP (Jerry Lotto)
Newsgroups: comp.sys.ibm.pc,comp.sources.d,comp.sys.intel
Subject: Re: 80287 FLD ST(0) - causes my AT to hang!
Message-ID: <36@wjh12.UUCP>
Date: Fri, 21-Nov-86 21:37:18 EST
Article-I.D.: wjh12.36
Posted: Fri Nov 21 21:37:18 1986
Date-Received: Sat, 22-Nov-86 00:02:15 EST
References: <35@wjh12.UUCP>
Reply-To: lotto@wjh12.UUCP (Jerry Lotto)
Distribution: net
Organization: Harvard Univ. Chem. Dept.
Lines: 9
Xref: mnetor comp.sys.ibm.pc:189 comp.sources.d:36 comp.sys.intel:49


I found the problem. For ref, the stack was full. The behavior was less than
graceful, but when another value was pushed - ZAP! The garbage on the stack
accumulated from assorted divide by zero exceptions that were not being cleaned
up after.

Debugging this was not fun. There were lots of twisty passages, all alike.
At any rate, the solution is a call to _fpreset in the floating point exception
code (fpe() in parse.c). I put mine inside an #ifdef MSC.