Merge branch 'barry/2025-10-18/optimize-aij-ops' into 'main'

Refactor handling of diagonal marking in *AIJ and SELL matrices

See merge request petsc/petsc!8797

- Replace MatMissingDiagonal() and MatMarkDiagonals_SeqXXX() with MatGetDiagonalMarkers_SeqXXX()

- Mat_SeqXXX->diag is not automatically created during MatAssemblyEnd() saving memory and time

- Replace MatMissingDiagonal() and MatMarkDiagonals_SeqXXX() with MatGetDiagonalMarkers_SeqXXX()

- Mat_SeqXXX->diag is not automatically created during MatAssemblyEnd() saving memory and time

- Accessing Mat_SeqXXX->diag now requires the use of MatGetDiagonalMarkers_SeqXXX() except when the current values are known to be correct; for example during numerical factorizations and solves

- Mat_SeqXXX->diag is now never shared among matrices; hence the free_diag flag is gone. That was always a risky proposition since any of the owning matrices could chang the values thus making them incorrect for other owners.

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Merge branch 'stefanozampini/submat-zerorows' into 'main'

implement ZeroRowsLocal and ZeroRowsColumnsLocal for local references

See merge request petsc/petsc!8705

Mat: add ops for zerorowscolumnslocal

Merge branch 'MarDiehl/use-bool-instead-of-enum' into 'main'

use bool instead of enum

See merge request petsc/petsc!8528

distinguish Boolean and Integer

MPI_Comm_get_attr has PetscMPIInt as flag argument, not PetscBool. Name
this flag "iflg" (was used somewhere already).
Use MPI_LAND instead of MPI_BAND for logical op

distinguish Boolean and Integer

MPI_Comm_get_attr has PetscMPIInt as flag argument, not PetscBool. Name
this flag "iflg" (was used somewhere already).
Use MPI_LAND instead of MPI_BAND for logical operations instead of
MPI_MIN, MPI_MAX, and MPI_LAND.

Note: Most of the previous code was probably working as intended, I did
the changes when debugging error related to the use of standard C Bool and
kept them because it took me a while to understand that MPI has integer
flags and PETSc has Booleans. Using different names makes this clear,
but was and is not done consistently.

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Merge branch 'MarDiehl/fix-typo' into 'main'

missing "s" for isascii and issundials

See merge request petsc/petsc!8559

missing "s" for isascii and issundials

Merge branch 'lindad/get-current-memtype-testing' into 'main'

MatGetCurrentMemType testing

See merge request petsc/petsc!8645

Fix compilation warning in matelem from !8505

Merge branch 'jolivet/cleanup' into 'main'

Housekeeping

See merge request petsc/petsc!8392

MatOps cleanup

Merge branch 'stefanozampini/matoption-no-error' into 'main'

MatSetOption: ignore unused options instead of erroring out

See merge request petsc/petsc!8179

MatSetOption: ignore unused options instead of erroring out

Merge branch 'lindad/new-aij-from-hash' into 'main'

Add MatCopyHashToXAIJ() to copy hash table entries into an XAIJ matrix type

See merge request petsc/petsc!7939

Add MatCopyHashToXAIJ() to copy hash table entries into an XAIJ matrix type

Merge branch 'jolivet/remove-cast' into 'main'

Use NULL or nullptr instead of casted 0

See merge request petsc/petsc!7857

Use NULL or nullptr instead of casted 0

Merge branch 'jczhang/2024-09-05/feature-mat-get-vpb' into 'main'

PC: add new mat ops MATOP_GET_{BLOCK, VBLOCK}_DIAGONAL

See merge request petsc/petsc!7811

Merge branch 'barry/2024-09-02/rebased-fix-conversion-warnings' into 'main'

Compiler finds (and forbid) casts from higher precision integers to lower

See merge request petsc/petsc!7806

Fix MPIU_* routines to always return MPI error codes and thus be usable with PetscCallMPI()

Introduce MPIU_Count to be used when MPI_Count is not available

PC: add new mat ops MATOP_GET_{BLOCK, VBLOCK}_DIAGONAL

so that a shell matrix can return its own (variable) point blocks in a matrix for use in PC (V)PBJacobi

Merge branch 'jose/deprecate-petsc-default' into 'main'

Fix usage of deprecated PETSC_DEFAULT

See merge request petsc/petsc!7707

Fix usage of deprecated PETSC_DEFAULT

Merge branch 'jolivet/fix-missing-field-initializers' into 'main'

Mat: fix -Wmissing-field-initializers

See merge request petsc/petsc!7628