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[Lapack] patches for scalapack to reduce use of uninitialized variables

Thank you Ake,
I am working right now on the next ScaLAPACK release.
It should be available hopefully before the end of the month.
On Mar 20, 2007, at 9:25 AM, ?ke Sandgren wrote:

On Mon, 2007-03-19 at 12:51 +0100, ????ke Sandgren wrote:

The attached set of patches for scalapack 1.7.4 does two things.
1 - reduce the usage of uninitialized variables
2 - fix a couple of incorrect calls to blacs (bad LDA)

Upcoming is a patch to pxlahqr to fix at least some of the  
variables and some other problems.

Attached is the lahqr patch and a fix to lasorte needed by lahqr which
used to get IERR != 0 back from lasorte.

The T2 = T1*V2 and T3 = T1*V3 moves are needed due to uninitialized
The 2 changed IF-statements where brought about to make getting and
sending SMALLA consistent.
The ISTOP change at the bottom is a copy of the corresponding  
at the top of the loop.

The init of VCOPY and SMALLA are neccesary.

lasorte couldn't handle a situation where the top S(1,1) eigenvalue  

This set of patches have been tested as can be seen on
so i'm fairly certain that they work correctly.

Ake Sandgren, HPC2N, Umea University, S-90187 Umea, Sweden
Internet: ake@Domain.Removed   Phone: +46 90 7866134 Fax: +46 90 7866126
Mobile: +46 70 7716134 WWW:
Lapack mailing list

Julie Langou; Innovative Computing Laboratory; Computer Science Dept;
University of Tennessee from Denver, Colorado ;-)

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