* combine.c (subst): Use CLASS_CANNOT_CHANGE_MODE and CLASS_CANNOT_CHANGE_MODE_P instead of CLASS_CANNOT_CHANGE_SIZE and hard-coded tests. (simplify_set): Likewise. (gen_lowpart_for_combine): Likewise. * emit-rtl.c (gen_lowpart_common): Likewise. * global.c (find_reg): Likewise. * local-alloc.c (find_free_reg): Likewise. * recog.c (register_operand): Likewise. * regclass.c (init_reg_sets_1): Likewise. (record_operand_costs, regclass): Likewise. * reload.c (push_reload): Likewise. * reload1.c (choose_reload_regs): Likewise. * flow.c (mark_used_regs): Conditionally set REG_CHANGES_MODE. * local-alloc.c (struct qty): Rename changes_size to changes_mode. Update all references. * regs.h (struct reg_info_def): Likewise. (REG_CHANGES_MODE): Rename from REG_CHANGES_SIZE. * tm.texi (CLASS_CANNOT_CHANGE_MODE): Document. (CLASS_CANNOT_CHANGE_MODE_P): Likewise. * config/alpha/alpha.h (CLASS_CANNOT_CHANGE_MODE): Rename. (CLASS_CANNOT_CHANGE_MODE_P): New. * config/mips/mips.h: Likewise. * config/pa/pa32-regs.h: Likewise. * config/pa/pa64-regs.h: Likewise. * config/rs6000/rs6000.h: Likewise. * config/sh/sh.h: Likewise. * config/ia64/ia64.h (CLASS_CANNOT_CHANGE_MODE): New. (CLASS_CANNOT_CHANGE_MODE_P): New. * config/avr/avr.h (CLASS_CANNOT_CHANGE_SIZE): Remove dead code. * config/d30v/d30v.h: Likewise. From-SVN: r34526
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