On 05/22/2013 12:43 AM, Jakub Jelinek wrote: > Changing frame grows upward into frame grows downward shouldn't be that > hard, see e.g. rs6000 port, where > #define FRAME_GROWS_DOWNWARD (flag_stack_protect != 0 || flag_asan != 0) > and grep the port where it uses FRAME_GROWS_DOWNWARD. > Basically you need to tweak initial elimination offset computation for it, > and that might be it, or perhaps one or two extra spots.
FWIW, I would actually recommend against conditionalizing FRAME_GROWS_DOWNWARD for a new port. Just make it _always_ grow down and save yourself the additional code bloat in the backend. r~
