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* [Bug fortran/47692] New: Numeric inaccuracy reported in testing lapack-3.3.0 BLAS module
@ 2011-02-11  0:28 jrt at worldlinc dot net
  2011-02-11  0:33 ` [Bug fortran/47692] " pinskia at gcc dot gnu.org
                   ` (17 more replies)
  0 siblings, 18 replies; 19+ messages in thread
From: jrt at worldlinc dot net @ 2011-02-11  0:28 UTC (permalink / raw)
  To: gcc-bugs

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47692

           Summary: Numeric inaccuracy reported in testing lapack-3.3.0
                    BLAS module
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jrt@worldlinc.net


A number of BLAS testing results were not clean. Some results were reported to
be suspect and others were reported to be fatal errors. Here's a paste of one
such result:


 ******* FATAL ERROR - COMPUTED RESULT IS LESS THAN HALF ACCURATE *******
                       EXPECTED RESULT                    COMPUTED RESULT
       1  (   0.551243    ,  -0.533049E-01)  (   0.551243    ,  -0.533049E-01)
       2  (  -0.816325E-01,   0.389502    )  (  -0.816325E-01,   0.389502    )
 ******* CGEMV  FAILED ON CALL NUMBER:
     10: CGEMV ('N',  2,  1,( 0.7,-0.9), A,  3, X, 1,( 0.0, 0.0), Y, 1)        
.


I don't know why BLAS routines didn't test cleanly, but it appears that most
severe results were in Complex Level I BLAS. There are some REAL and DOUBLE
problems too. This is a well-established numeric library that as I recall
tested cleanly with gfortran 4.4.5.

The results from testing BLAS and Lapack are in two text files that I can make
available, though independent verification is of course needed for this.


^ permalink raw reply	[flat|nested] 19+ messages in thread
end of thread, other threads:[~2012-06-26 16:17 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2011-02-11  0:28 [Bug fortran/47692] New: Numeric inaccuracy reported in testing lapack-3.3.0 BLAS module jrt at worldlinc dot net
2011-02-11  0:33 ` [Bug fortran/47692] " pinskia at gcc dot gnu.org
2011-02-11  0:35 ` jrt at worldlinc dot net
2011-02-11  1:20 ` jrt at worldlinc dot net
2011-02-11  2:36 ` kargl at gcc dot gnu.org
2011-02-11 19:45 ` anlauf at gmx dot de
2011-02-11 20:03 ` jrt at worldlinc dot net
2011-02-11 20:07 ` jvdelisle at gcc dot gnu.org
2011-02-11 20:24 ` sgk at troutmask dot apl.washington.edu
2011-02-11 20:33 ` anlauf at gmx dot de
2011-02-11 20:56 ` anlauf at gmx dot de
2011-02-16  2:45 ` jrt at worldlinc dot net
2011-02-16 18:04 ` anlauf at gmx dot de
2011-02-17  1:14 ` jvdelisle at gcc dot gnu.org
2011-02-18 17:05 ` jrt at worldlinc dot net
2012-03-19 14:51 ` sliwa at blue dot cft.edu.pl
2012-06-25 20:26 ` anlauf at gmx dot de
2012-06-26 15:08 ` jrt at worldlinc dot net
2012-06-26 16:17 ` kargl at gcc dot gnu.org

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