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gh-36059: Speed up the creation of submatrices of `Matrix_modn_dense_…
…template` matrices <!-- ^^^^^ Please provide a concise, informative and self-explanatory title. Don't put issue numbers in there, do this in the PR body below. For example, instead of "Fixes #1234" use "Introduce new method to calculate 1+1" --> <!-- Describe your changes here in detail --> Modified the method `submatrix()` to do a systematic call to `memcpy()`. Overrode methods `matrix_from_rows()`, `matrix_from_columns()` and `matrix_from_rows_and_columns()`. <!-- Why is this change required? What problem does it solve? --> In the current version of `submatrix()`, only the case when the submatrix has as many columns as the matrix, relies on the contiguous memory storage of `Matrix_modn_dense_template` and call `memcpy()`. In fact, this can be applied to any set of arguments given to the method and enables better performances. Overriding the other methods mentioned above allows to avoid calling `get_unsafe()` and `set_unsafe()` that are doing time-consuming casts/conversions that are unnecessary in this case. <!-- If this PR resolves an open issue, please link to it here. For example "Fixes #12345". --> <!-- If your change requires a documentation PR, please link it appropriately. --> ### 📝 Checklist <!-- Put an `x` in all the boxes that apply. --> <!-- If your change requires a documentation PR, please link it appropriately --> <!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! --> <!-- Feel free to remove irrelevant items. --> - [x] The title is concise, informative, and self-explanatory. - [x] The description explains in detail what this PR is about. - [ ] I have linked a relevant issue or discussion. - [x] I have created tests covering the changes. - [ ] I have updated the documentation accordingly. ### ⌛ Dependencies <!-- List all open PRs that this PR logically depends on - #12345: short description why this is a dependency - #34567: ... --> <!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! --> URL: #36059 Reported by: Marie Bonboire Reviewer(s): Vincent Neiger
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