This repo contains 3 different examples testing different implementations of a '#pragma omp atomic' for floats
1. parallel_with_atomic.c
we rely on the transformation of the compiler.
2. parallel_with_builtin_01.c
the atomic operation is implemented using the
'__sync_bool_compare_and_swap_4' intrinsic + an extra memory fence per
iteration. Note that is not clear whether the atomic builtin implies a
memory fence:
https://gcc.gnu.org/onlinedocs/gcc-6.3.0/gcc/_005f_005fsync-Builtins.html#_005f_005fsync-Builtins
3. parallel_with_builtin_02.c
Similar to the previous test but removing the memory fence (__sync_synchronize).