llvm dev - Aug 2019 - FC: A new LLVM based Fortran Frontend

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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