f77 compiler bug?

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Article #6

From: Bill Cornette
Date: Tue, 15 Dec 1992 17:05

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	I posted this to comp.sys.sgi but it appears to have disappeared with
the creation of these new groups, so here goes again.

	I seem to have encountered a compiler bug for SGI's f77 compiler.
I used the line of code


	QROT=DPROD(TREF,1./TEMP)**XK

where TREF=273.15, TEMP =304., and XK=1.50.  The resulting value for
QROT is identically 0.000000.  TREF, TEMP, and XK are declared REAL and
QROT is declared DOUBLE PRECISION.
	If I break the code up so

	
	QROT=DPROD(TREF,1./TEMP)
        QROT=QROT**XK

I get the right answer of QROT=0.85...

	This looks like a compiler bug to me.  Any comments?
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William M. Cornette         Photon Research Associates, Inc.
(619) 455-9741              9393 Towne Centre Drive, Suite 200
FAX (619) 455-0658          San Diego, California  92121
wmc@photon.com
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T.A.N.S.T.A.A.F.L.

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Newsgroups: comp.sys.sgi.bugs
Path: arc1-ca.pugleaf.net!sparky!uunet!think.com!sdd.hp.com!ncr-sd!crash!photon.photon.com!wmc
From: wmc@photon.com (Bill Cornette)
Subject: f77 compiler bug?
Message-ID: <1992Dec15.170549.15433@photon.com>
Sender: usenet@photon.com (Usenet dummy users)
Organization: Photon Research Associates, Inc.
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Date: Tue, 15 Dec 1992 17:05:49 GMT
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