* config/rl78/constrains (Qs8): New constraint.
* config/rl78/rl78.c (rl78_flags_already_set): New function.
* config/rl78/rl78-protos.h (rl78_flags_already_set): New prototype.
* config/rl78/rl78-real.md (update_Z): New attribute.
Update patterns to set it.
(cbranchqi4_real): Call rl78_flags_already_set() to determine if a
shorter compare and branch sequence can be used.
(cbranchhi4_real): Likewise.
(cbranchhi4_real_inverted): Likewise.
* config/rl78/predicates.md (uword_operand): Allow symbol_refs.
* config/rl78/rl78-c.c (rl78_register_pragmas): Register __near
address space.
* config/rl78/rl78.c (rl78_get_name_encoding): New.
(rl78_option_override): Allow -mes0 only if C.
(characterize_address): Support subregs of symbol_refs.
(rl78_addr_space_address_mode): Move. Add __near.
(rl78_far_p): Likewise.
(rl78_addr_space_pointer_mode): Likewise.
(rl78_as_legitimate_address): Likewise.
(rl78_addr_space_subset_p): Likewise.
(rl78_addr_space_convert): Likewise.
(rl78_print_operand_1): Support 16-bit addressing of 32-bit
symbols with -mes0.
(transcode_memory_rtx): Don't copy ES if -mes0. Allow symbol[BC]
addressing.
(rl78_alloc_physical_registers_op1): Change logic to prefer
symbol[BC] addressing.
(frodata_section): New.
(rl78_asm_init_sections): Initialize it.
(rl78_select_section): Put __far readonly symbols in .frodata.
(rl78_make_type_far): New.
(rl78_insert_attributes): Force all readonly symbols to be __far when -mes0.
(rl78_asm_out_integer): New.
* config/rl78/rl78.h (ADDR_SPACE_NEAR): New.
* config/rl78/rl78.opt (-mes0): New.