@certik, thanks!
It is open source: benchmark.f. And we already discussed one of the issue in another thread. I am using ‘compiler_version’ and ‘compiler_options’ from ‘iso_fortran_env’. Last time I checked, lfortran was not supporting these functions.
But I am following closely your progress and will give it another shot whenever possible 
For the record, the issue was in the ASR (since I need all the variable names, etc…), AST works fine.