[Bug fortran/18714] Runtime hang in LAPACK routine SLAMC1 - in Quetzal benchmark suite

prthomas at drfccad dot cea dot fr gcc-bugzilla@gcc.gnu.org
Fri Jan 28 17:02:00 GMT 2005


------- Additional Comments From prthomas at drfccad dot cea dot fr  2005-01-28 17:02 -------
Subject: RE:  Runtime hang in LAPACK routine SLAMC1 - i
	n Quetzal benchmark suite

Bon soir François-Xavier,

Tu as raison!  Même -O1 fait coincer le programme.

Je suis étonné quand-même que le "fix" est d'injecter d'un PRINT *,
"n'importe quoi" et, aussi, qu'il est légèrement impossible isoler le bogue.
Tu as des explications là-dessous?

Je vais afficher une réponse sur Bugzilla, avant de sortir.

Paul  

-----Message d'origine-----
De : coudert at clipper dot ens dot fr [mailto:gcc-bugzilla@gcc.gnu.org]
Envoyé : vendredi 28 janvier 2005 13:20
À : paul.richard.thomas@cea.fr
Objet : [Bug fortran/18714] Runtime hang in LAPACK routine SLAMC1 - in
Quetzal benchmark suite



------- Additional Comments From coudert at clipper dot ens dot fr
2005-01-28 12:19 -------
Did you try to compile this file without optimization (as is indicated in:
http://www.netlib.org/lapack/faq.html#1.26)? The code in the ?lam*.f files
is
used to determine the machine precision (which could be done easily in
Fortran >
77), and any level of optimization other than -O0 usually causes infinite
loops.

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18714

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