OpenMP: Improve comments for the omp_deep_mapping language hooks.
The interface comments for the OpenMP deep mapping language hooks have been improved for clarity.
This commit improves the interface comments for the omp_deep_mapping language hooks in GCC. These hooks are used to handle deep data mappings in OpenMP, and the improved comments should make their purpose and usage clearer to developers working with the OpenMP runtime.
In Details
The OpenMP runtime in GCC uses language hooks (functions exposed to the compiler frontends) to implement specific OpenMP features. omp_deep_mapping relates to handling complex data mappings within OpenMP's data environment. The langhooks are defined in langhooks.h and implemented in langhooks.cc and trans-openmp.cc (for the Fortran frontend).
For Context
OpenMP is an API for writing parallel programs. It allows developers to specify how data should be shared or private among threads. Deep mapping refers to how nested data structures are handled when transferring data between the host and a parallel device (e.g. a GPU) in OpenMP programs. Language hooks are functions that the compiler uses to interact with the OpenMP runtime library.