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Re: [C Patch]: pr52543

Richard Sandiford <> 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.



> 2012-04-03  Kenneth Zadeck  <>
> 	    Richard Sandiford  <>
> 	* (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.

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