As an indirect answer, consider Julia, which is based on LLVM and seems to be competitive with Fortran on large scale, numerically intensive calculations.
LFortran can translate your Fortran code to Julia via our Julia backend. Once Julia can compile to a binary, it will be exciting to do some comparisons, like speed of compilation and performance of the generated binary. As well as the quality of the Julia code that we generate, we'll be happy to improve it to create canonical Julia code, if at all possible.
