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remove shape tuple allocation in `reshape` #153

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vpuri3 opened this issue Feb 24, 2023 · 0 comments

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vpuri3 commented Feb 24, 2023 •

edited

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example thanks to @dgleich

function myfun(u)
    rval = zero(eltype(u))
    z=reshape(@view(u[1:end]), 100, 10000)
    for j in 1:size(z,2)
        sum2 = zero(eltype(z))
        for i in 1:size(z,1);
            sum2 += z[i,j];
        end
        rval += sum2^2
    end
    return rval
end

julia> @btime myfun($u)
  534.792 μs (0 allocations: 0 bytes)
2.5071715895145908e7

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