This repository contains simple examples which have been used to compare the LLVM IR generated by the LLVM native C and FORTRAN compilers
The ./src folder contains C and FORTRAN source code that can be compiled with
make FC=flang-new CC=clang APP=file_name OPT=<-O0,...,-Ofast>This will generate multiple output files. LLVM IR is stored in ./ir/, bitcode in ./bitcode/, object files in ./lib/, and executables in ./bin/.
The folder ./cbindings_offloading contains examples of how FORTRAN subroutines can be called from OpenMP target offloading regions in C. It is shown how functions and subroutines are called in different ways, and how the functions can be called by other names in C.
The LLVM IR can be printed after each LLVM optimization pass with make llvmirdump for both flang-new anfd clang. As flang-new does not lower the source code directly to LLVM IR, it may be necessary to inspect other levels of intermediate representation. The MLIR from flang-new can be printed with make mlirdump.