gistfile1.txt

Pkg.add("BenchmarkTools")
using BenchmarkTools
function inplace_sq_mat(m::Array{Float64, 2}, n::Array{Float64, 2})
    s = size(m, 1)
    t = s+1
    v = zeros(t)

    @inbounds for i=1:s
        for j=1:s
            v[j] = m[j, i]
        end

        for k=1:s
            v[t] = 0.
            for l=1:s
                v[t] += v[l]*n[k, l]
            end
            m[k, i] = v[t]
        end
    end

    return m
end

function inplace_sq_mat_bounds(m::Array{Float64, 2}, n::Array{Float64, 2})
    s = size(m, 1)
    t = s+1
    v = zeros(t)

    for i=1:s
        for j=1:s
            v[j] = m[j, i]
        end

        for k=1:s
            v[t] = 0.
            for l=1:s
                v[t] += v[l]*n[k, l]
            end
            m[k, i] = v[t]
        end
    end

    return m
end

A = rand(100, 100)
B = rand(100, 100)
@benchmark inplace_sq_mat($A, $B)
@benchmark inplace_sq_mat_bounds($A, $B)