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Cleanup on QR/LQ algorithms to reuse D matrix is possible

Mathieu Faverge requested to merge faverge/chameleon:feature/tpqrt into master

Modify the pz interfaces of the QR/LQ subroutines to decide if the copy of the diagonal tiles (used by StarPU, or for GPU updates) needs to be performed or not. Thus we can generate them during the factorization, and keep them for solve and/or Q generation/application.

Edited by Mathieu Faverge

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