Fix: unify DAV subspace diagonalization to use lapack_hegvx#7302

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Cstandardlib wants to merge 3 commits intodeepmodeling:developfrom

Cstandardlib:fix/ds

Commits on Apr 30, 2026

Fix: unify DAV subspace diagonalization to use lapack_hegvx

Cstandardlib
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sisyphus-dev-ai
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Fix: use 'U' uplo and valid IWORK/IFAIL in lapack_hegvx CPU query

Cstandardlib
and
sisyphus-dev-ai
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Fix: protect GPU lapack_hegvx inputs, keep GPU path using hegvd

Cstandardlib
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sisyphus-dev-ai
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