Ifx and ifort are binary (.o/.obj) and module file (.mod) compatible.
Added a couple of features from OpenMP 6.0. Most OpenMP 4.5 and OpenMP 5.0/5.1 directives and offloading features. Completely implements FORTRAN 77, Fortran90/95, Fortran 2003, Fortran 2008 and Fortran 2018 language standards. ifx is based on the Intel® Fortran Compiler Classic (ifort) frontend and runtime libraries, but uses LLVM-based backend compiler technology. Our latest compiler, the Intel® Fortran Compiler (ifx), has achieved language feature parity with ifort (Fortran 2018)! Use ifx for CPUs and Intel GPUs. The OpenMP 5.0, 5.1 GPU offload features in ifx are not available in ifort. The Intel® Fortran Compiler (ifx) has all of the Fortran 2018 language features of ifort, plus the added functionality of OpenMP* directives to offload to Intel GPUs. 
The Intel® oneAPI product packages provide two Fortran compilers. Intel® Fortran Compiler Classic (ifort) provides best-in-class Fortran language features, including full Fortran 2018 support, along with outstanding performance for Intel® Architecture CPUs.
This document provides a summary of new and changed product features and includes notes about features and problems not described in the product documentation.
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