[Bug fortran/47692] New: Numeric inaccuracy reported in testing lapack-3.3.0 BLAS module

[jrt at worldlinc dot net]

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.