[feature] add xsimd::count_if, xsimd::count #19

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[feature] add xsimd::count_if, xsimd::count#19

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ThomasRetornaz

opened on Oct 25, 2026

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Todos

• implement count_if/count using xsimd (see https://cppreference.com/cpp/algorithm/count)
• add tests
• add a dummy benchmark (STL default execution policy VS current implementation)

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