Note that ifort defaults to a substantial equivalent of gfortran’s `-ffast-math`, which is not the default in gfortran. It looks like the equivalent option is

Note that ifort defaults to a substantial equivalent of gfortran’s `-ffast-math`, which is not the default in gfortran. It looks like the equivalent option is still under discussion for rust: https://github.com/rust-lang/rust/issues/21690 https://github.com/rust-lang/rust/issues/21690