FC: A new LLVM based Fortran Frontend

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FC: A new LLVM based Fortran Frontend

Kristóf Umann via cfe-dev
A new front end for Fortran ( https://github.com/compiler-tree-technologies/fc ) has been written in the design spirit of LLVM/Clang. This is a prototype version with approximately 20K+ lines of code. The compiler is close to Fortran 95 standard. The Front end is a complete end to end solution without semantic analysis. It compiles and runs 400+ unit test cases and 2 (503.bwaves_r and 548.exchange2_r) SPEC CPU 2017 Fortran benchmarks. 

Major supported features inlcudes:
1. Nested do, do-while, where, select-case, forall, implied-do constructs,
2. Handling/Expanding Array Section expressions, Array constructors,
3. IO Handling: File read/write with basic Formatting support.
4. Support for around 40 Fortran Intrinsics like transpose, reshape, min, max, sum, etc
5. Nested Functions/ Module/ Subroutines.
6. Derived types are partially supported(WIP)
7. Dynamic memory handling (allocate statement) using malloc/free.
8. Very basic Debugging / TBAA support.

LLVM code generated is fairly optimized. The performance in SPEC becnhmarks are comparable(better in few cases) to flang and gfortran compilers in both speed and rate runs.

Feedback/ comments are welcome.

Thanks,
Prashantha N.R.
Compiler Tree Technologies

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