lapack
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Unused value?
https://github.com/Reference-LAPACK/lapack/blob/4f7f2aab27814a920613f27f4b0d5055a421dcaf/SRC/dbdsqr.f#L456-L468
At the end of the loop, SMIN is the absolute of the digonal minimum value, but its value is never used, I wonder why.