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Re: Polyhedron Benchmark Tests - TEST_FPU.F90
- From: Toon Moene <toon at moene dot indiv dot nluug dot nl>
- To: Brooks Moses <bmoses-nospam at cits1 dot stanford dot edu>
- Cc: fortran at gcc dot gnu dot org
- Date: Sat, 05 Mar 2005 13:56:42 +0100
- Subject: Re: Polyhedron Benchmark Tests - TEST_FPU.F90
- Organization: Moene Computational Physics, Maartensdijk, The Netherlands
- References: <756DFD3DE8F1D411A59A00306E06E84702C42583@DRFCCAD> <4887198.1110021648698.JavaMail.root@dtm1eusosrv72.dtm.ops.eu.uu.net>
Brooks Moses wrote:
Should we be concerned with the fact that different compilers produce
somewhat different values of the error, or is that to be expected from
the fact that the optimization results in different orderings of
operations (or, for that matter, that different compilers have different
random-number generators)?
Note that any Fortran program that contains statements like:
X = A + B + C
is not guaranteed (by the Standard) to have one and only one valid
interpretation.
Hope this helps,
--
Toon Moene - e-mail: toon@moene.indiv.nluug.nl - phone: +31 346 214290
Saturnushof 14, 3738 XG Maartensdijk, The Netherlands
Maintainer, GNU Fortran 77: http://gcc.gnu.org/onlinedocs/g77_news.html
A maintainer of GNU Fortran 95: http://gcc.gnu.org/fortran/