On 2016/1/20 09:17 PM, Bernd Schmidt wrote: > On 01/05/2016 02:15 PM, Chung-Lin Tang wrote: >> * omp-low.c (scan_sharing_clauses): Call add_local_decl() for >> use_device/use_device_ptr variables. > > It looks vaguely plausible, but if everything is part of the host > function, why make a copy of the decl at all? I.e. what happens if you > just remove the install_var_local call?
Because (only) inside the OpenMP context, the variable is supposed to contain the device-side value; a runtime call is used to obtain the value from the device back to host. So a new variable is created, the remap_decl mechanisms are used to change references inside the omp context, and other references of the original variable are not touched.
