On Thu, May 21, 2015 at 02:05:12PM +0100, Julian Brown wrote:
> OpenACC handles function calls specially (calling them "routines" -- of
> varying sorts, gang, worker, vector or seq, affecting where they can be
> invoked from). The plan is that all threads will call such routines --
> and then some threads will be "neutered" as appropriate within the
> routines themselves, as appropriate.
All functions will behave that way, or just some using some magic attribute
etc.? Say will newlib functions behave this way (math functions, printf,
...)? For math functions e.g. it would be nice if they could behave both ways
(perhaps as separate entrypoints), so have the possibility to say how many
threads from the warp will perform the operation and then work on array
arguments and array return value (kind like OpenMP or Cilk+ elemental
functions, just perhaps with different argument/return value passing
conventions).
Jakub
