(enum processor_type): Add PROCESSOR_R4600.
(MASK_64BIT, TARGET_64BIT): New mask bit, to indicate 64 bit mode.
(HAVE_64BIT_P, OPTIMIZATION_OPTIONS): Delete.
(CPP_SPEC): Don't abort if not defined.
(CC1_SPEC): -mips1 and -mips2 imply -mfp32. -mips3 implies -mfp64.
(CPP_SPEC): Define __SIZE_TYPE__, __PTRDIFF_TYPE__, and __mips.
(BITS_PER_WORD, UNITS_PER_WORD, INT_SIZE_TYPE, LONG_TYPE_SIZE,
LONG_LONG_TYPE_SIZE, POINTER_SIZE, POINTER_BOUNDARY,
PARM_BOUNDARY, EMPTY_FIELD_BOUNDARY, HARD_REGNO_NREGS,
CONST_OK_FOR_LETTER_P, STACK_ARGS_ADJUST, FUNCTION_PROFILER,
TRAMPOLINE_TEMPLATE, TRAMPOLINE_SIZE, TRAMPOLINE_ALIGNMENT,
INITIALIZE_TRAMPOLINE, CASE_VECTOR_MODE, MOVE_MAX,
TRULY_NOOP_TRUNCATION, Pmode, FUNCTION_MODE,
ASM_OUTPUT_ADDR_VEC_ELT, ASM_OUTPUT_ADDR_DIFF_ELT,
ASM_OUTPUT_REG_PUSH, ASM_OUTPUT_REG_POP): Add 64 bit support.
(MAX_BITS_PER_WORD, MAX_UNITS_PER_WORD, UNITS_PER_FPREG,
MAX_INT_TYPE_SIZE, MAX_WCHAR_TYPE_SIZE, MAX_LONG_TYPE_SIZE,
MAX_MOVE_MAX): Define.
(INDEX_REG_CLASS): NO_REGS not GR_REGS.
(CONST_DOUBLE_OK_FOR_LETTER_P): Don't examine CONST_DOUBLE
internals.
(PREFERRED_RELOAD_CLASS): Return CLASS if it isn't ALL_REGS.
(TRANSFER_FROM_TRAMPOLINE, ASM_OUTPUT_CASE_LABEL): Delete.
(REGNO_OK_FOR_INDEX_P, REG_OK_FOR_INDEX_P): Redefine to 0.
(GO_IF_LEGITIMATE_ADDRESS): Delete redundant code0 == REG test.
(ENCODE_SECTION_INFO): Don't test mips_section_threshold.
(CONST_COSTS): CONST_INT have cost 0 not CONSTS_N_INSNS (0).  Pass
address not MEM to eliminate_constant_term.  Add 64 bit support.
(MEMORY_MOVE_COST, ASM_OUTPUT_DOUBLE_INT): Define.
(EXTRA_SECTIONS): Delete in_last_p1.
(SELECT_RTX_SECTION): Delete division by BITS_PER_UNIT.
(NO_BUILTIN_SIZE_TYPE, NO_BUILTIN_PTRDIFF_TYPE): Define.
(SIZE_TYPE, PTRDIFF_TYPE): Add 64 bit support.

From-SVN: r6392