[SIMD] fix Solvers - if one lane has zero initial residual

If one lane has zero residual (e.g. the RHS and initial guess is zero) the division in the factor for the minimizing and orthogonalization is handled explicitly to avoid NaNs.

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• ad9c4558 - [SIMD] fix CGSolver - if one lane has zero residual

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• 4681df6d - [SIMD] fix CGSolver - if one lane has zero residual

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• 75580f08 - [SIMD] fix CGSolver - if one lane has zero residual

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• 3bd717f0 - [SIMD] fix CGSolver - if one lane has zero residual

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• 96bc8c86 - [SIMD] fix CGSolver - if one lane has zero residual

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• be5ae3d9 - [SIMD] make solvers robust against 0 defect
• 84799974 - [SIMD] Check the convergence criterion for every lane independendly.

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Apparently other solvers have the same issue as well. I added workarounds for them, too.

Furthermore I changed the convergence criterion to be checked for every lane independently. Before, if one lane starts with the exact solution (residual norm equals 0) the reduction cannot be reached for that lane, so the iteration proceeds until all residuals have norm smaller than 1E-30.

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• d373be64 - [SIMD] add Changelog entry

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• 1cd027cb - [SIMD] make solvers robust against 0 defect
• 6896f75e - [SIMD] Check the convergence criterion for every lane independendly.
• 9cf80ced - [SIMD] add Changelog entry

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changed title from [SIMD] fix CGSolver - if one lane has zero residual to [SIMD] fix Solvers - if one lane has zero initial residual

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• 2c82f0f5 - [SIMD] add explicit conversion to avoid problems with older clang versions

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assigned to @christi

looks good. Thanks!

merged

mentioned in commit b32cc1cf