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[Bug fortran/5900] [g77 & gfortran] Lapack regressions since g77 2.95.2
- From: "Thomas dot Koenig at online dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 7 Feb 2005 14:04:01 -0000
- Subject: [Bug fortran/5900] [g77 & gfortran] Lapack regressions since g77 2.95.2
- References: <20020309112600.5900.schmid@snake.iap.physik.tu-darmstadt.de>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From Thomas dot Koenig at online dot de 2005-02-07 14:03 -------
Things are strange on IA-64.
I played around a bit with different optimization levels
for xeigtstd with ded.in as input file. I compiled everything
at -O1 and -O3, and then tried replacing single object files
with the ones compiled at -O0.
Results are as follows: When compiling one of dgemv.f or dger.f with
-O0, the failures disappear.
When compiling dnrm2.f or dtrmv.f with -O0, the failures go down to
two (from four).
All of these are BLAS routines.
Looks like some loop reordering is causing slight differences
in floating point behavior...
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=5900