This page lists all Fortran intrinsic functions and their implementation status in LFortran in the LLVM backend. (We can later extend this page to other backends also.)
An intrinsic function is implemented if it has comprehensive tests in the `integration_tests` directory and it compiles with LFortran and runs.
The list of intrinsic functions is available in the latest Fortran standard: https://j3-fortran.org/doc/year/18/18-007r1.pdf, Table 16.1 page 332 (Chapter 16). Section 16.9 on pages 339-426 then lists details of each function.