[petsc-users] Origin of f2cblaslapack source code

[Dave May]

Hello,

A colleague of mine asked me about quad precision support in blas/lapack
libraries. Naturally I said just use petsc... however he couldn't be
convinced.

I thought that the f2cblaslapack source which petsc's configure downloaded
and compiled would be identical to that found at Netlib. However, a quick
inspection of both source codes reveals that this is not the case.

I asked Matt and he told me that he thought Satish generated the particular
source which petsc is fetching when --download-f2cblaslapack is invoked.

I was wondering
(i) how was the quad precision source actually generated and
(ii) how extensively tested is that source code when used for quad
precision arithmetic?


Cheers,
  Dave
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