Re: Use df_read_modify_subreg_p in cprop.c

On 11/15/2016 09:27 AM, Richard Sandiford wrote: local_cprop_find_used_regs punted on all multiword registers, with the comment: /* Setting a subreg of a register larger than word_mode leaves the non-written words unchanged. */ But this only applies if the outer mode is smaller

Use df_read_modify_subreg_p in cprop.c

local_cprop_find_used_regs punted on all multiword registers, with the comment: /* Setting a subreg of a register larger than word_mode leaves the non-written words unchanged. */ But this only applies if the outer mode is smaller than the inner mode. If they're the same size then