Richard Sandiford <rdsandif...@googlemail.com> writes: > What do you think? The patch looks OK to me with these changes, > but I'd like to leave it for 48 hours to see if Ian has any comments.
The patch looks fine to me. Thanks. Ian > 2012-04-03 Kenneth Zadeck <zad...@naturalbridge.com> > Richard Sandiford <r.sandif...@uk.ibm.com> > > * Makefile.in (lower-subreg.o, target-globals.o): Depend on > lower-subreg.h. > * lower-subreg.h: New file. > * target-globals.h (this_target_lower_subreg): Declare. > (target_globals): Add lower_subreg; > (restore_target_globals): Restore this_target_lower_subreg. > * target-globals.c: Include it. > (default_target_globals): Add default_target_lower_subreg. > (save_target_globals): Initialize target_lower_subreg. > * rtl.h (init_lower_subreg): Added declaration. > * toplev.c (backend_init_target): Call initializer for lower-subreg > pass. > * lower-subreg.c (LOG_COSTS, FORCE_LOWERING): New macros. > (default_target_lower_subreg): New variable. > (this_target_lower_subreg): Likewise. > (twice_word_mode, choices): New macros. > (shift_cost, compute_splitting_shift, compute_costs) > (init_lower_subreg): New functions. > (resolve_simple_move): Add speed_p argument. Check choices. > (find_pseudo_copy): Don't check the mode size here. > (resolve_simple_move): Assert the mode size. > (find_decomposable_shift_zext): Add speed_p argument and return > a bool. Check choices. > (resolve_shift_zext): Add comment. > (dump_shift_choices, dump_choices): New functions. > (decompose_multiword_subregs): Dump list of profitable > transformations. Add code to skip non profitable transformations. > Update calls to simple_move and find_decomposable_shift_zext.
