# gslevu calling conventions - avram - a virtual machine code interpreter
avram - a virtual machine code interpreter

#### D.6.1 `gslevu` calling conventions

The input to either of these functions is a list of real numbers represented as explained in math.

The result is a pair `(`s`,`e`)` holding an estimate of the sum, s, and an estimate of the error in the sum, e, each being a real number.

Both functions compute the same sum, s, but the `utrunc` function is faster and more memory efficient, using a less trustworthy method of estimating the error.