ml divide function in matlab

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I'm quite new to MATLAB, and I was wandering the following question: if A is a square, non-singular matrix, b a vector of the same length, if I ask Matlab to do A\b (so, the function mldivide) the answer will be calculated in the most efficient way (or, at least, in a decent way: without doing the inverse, for example), or it will roughly do inv(A)*b?