Merge remote-tracking branch 'origin/release' into master

Merge branch 'jose/release/pgi-20.9-warnings' into 'release'

Fix warnings in NVIDIA compilers (formerly PGI)

See merge request petsc/petsc!3397

Fix warnings in NVIDIA compilers (formerly PGI): unreachable statement

Merge remote-tracking branch 'origin/release' into master

Merge branch 'stefanozampini/fix-gamg-transposegencuda' into 'release'

Fix CUDA performance regression and KOKKOS bugfixes

See merge request petsc/petsc!3310

MatTransposeMatMult_SeqAIJ: avoid transpositions if possible

Merge branch 'dalcinl/fix-null' into 'master'

Fix 0 -> NULL for pointers

See merge request petsc/petsc!3086

Mat: Replace 0 -> NULL for pointers

Merge branch 'stefanozampini/fix-matproduct-logging' into 'master'

fix matproduct logging

See merge request petsc/petsc!2857

MatMultNumericAdd_SeqAIJ_SeqDense: Improve performances

1M x 1M AIJ matrix with 10 nonzeros per row times 2 columns -> 2x improvement
smaller improvements (20% in time) for larger numbers of columns

Merge remote-tracking branch 'origin/maint'

Merge branch 'stefanozampini/fix-fpe-divbyzero' into 'maint'

MatMatMultSymbolic_SeqAIJ_SeqAIJ_Sorted: prevent from division by zero

See merge request petsc/petsc!2844

MatMatMultSymbolic_SeqAIJ_SeqAIJ_Sorted: prevent from division by zero

Merge branch 'jolivet/feature-kspmatsolve-deprecate-ksphpddmmatsolve' into 'master'

Change how solves with multiple RHS work

See merge request petsc/petsc!2811

Change how solves with multiple RHS work

* Deprecate KSPHPDDMMatSolve
* Add KSPMatSolve, previously known as KSPHPDDMMatSolve
* New option -ksp_matsolve_block_size
* New routines MatDense[Get|Restor

Change how solves with multiple RHS work

* Deprecate KSPHPDDMMatSolve
* Add KSPMatSolve, previously known as KSPHPDDMMatSolve
* New option -ksp_matsolve_block_size
* New routines MatDense[Get|Restore]SubMatrix

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Merge branch 'stefanozampini/feature-add-hpackages-rebased' into 'master'

Fixes to MatProduct + many bug fixes + new hierarchical matrix support

See merge request petsc/petsc!2800

MatProduct: proper cleanup of additional data structure

Do not mess with view/destroy routine, add an extra slot to MatProduct struct to stash the data, destroy/view routines
Deprecate MatFreeInterm

MatProduct: proper cleanup of additional data structure

Do not mess with view/destroy routine, add an extra slot to MatProduct struct to stash the data, destroy/view routines
Deprecate MatFreeIntermediateStructures in favor of MatProductClear
Clean up base headers for matrix classes
Update tests (remove some todos from ex70 because now the tests work properly)
MatProductSetType should not set the setfromoptions operation!
MatProductClear should reset operations
Remove no longer needed function composition
Add few more PetscInfo messages
Single dispatch routine
MatProductSetFromOptions routines are now allowed to fail
MatProductSetFromOptions_SeqXBAIJ_SeqDense: support for MATPRODUCT_AtB
MatTransposeMatMultNumeric_SeqAIJ_SeqDense: fix bug with leading dimensions
Make internal functions PETSC_INTERN
Fix a couple of places where the destroy routine of the matrix was changed
Products should all use internal data (or composed data attached to the internal data)
Fix few bugs in MPIAIJ_MPIDENSE product with stages

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MatProduct: add support for basic AB and AtB products with B of type dense

do not fail if not supported
MatProductSetAlgorithm should copy the string, not the pointer!
Fix various checks
Fix new mat

MatProduct: add support for basic AB and AtB products with B of type dense

do not fail if not supported
MatProductSetAlgorithm should copy the string, not the pointer!
Fix various checks
Fix new mat/vec type propagation in few cases

Reported-by: "Jose E. Roman" <jroman@dsic.upv.es>, Pierre Jolivet <pierre.jolivet@enseeiht.fr>

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MatMatMultSymbolic_SeqAIJ_SeqDense: C lda

Merge remote-tracking branch 'origin/maint'

Merge branch 'stefanozampini/fix-matmatmult-prj' into 'maint'

Fix MatMatMult old API when reusing dense output matrix

See merge request petsc/petsc!2761

Revert "enable MatSetOption() for matproduct; Reported by Nourgaliev, Robert Nr <nourgaliev1@llnl.gov>"

This reverts commit 0e1ed72ee065c9f36858e956742a5e16988d3676.

MatSetSeqAIJWithArrays: rework the internal routine

Set type only if passed or if the already used matrix is not derived from AIJ
Skip MatAssemblyBegin/End

MatMatMultSymbolic with DENSE output: use MatSetUp instead of SetPreallocation

This way we can preserve the local array if already present

Merge remote-tracking branch 'origin/maint'