* i386.h (FIRST_PSEUDO_REGISTER): Set to 53.
	(FIXED_REGISTERS, CALL_USED_REGISTERS, REG_ALLOC_ONES): Add extended ones.
	(CONDITIONAL_REGISTER_USAGE): Set proper values according to TARGET_64BIT.
	(FIRST_REX_INT_REG, LAST_REX_INT_REG, FIRST_REX_SSE_REG, LAST_REX_SSE_REG):
	define.
	(enum reg_class): Add 'LEGACY_REGS'
	(REG_CLASS_CONTENTS): Likewise; add extended registers.
	(SSE_REGNO_P): Recognize extended registers.
	(ANY_QI_REG_P, REX_INT_REGNO_P, REX_INT_REG_P): New.
	(REG_CLASS_FROM_LETTER): Add 'R' and 'Q'.
	(REGNO_OK_FOR_INDEX_P, REGNO_OK_FOR_BASE_P, REG_OK_FOR_BASE_NONSTRICT_P):
	 Recognize REX registers.
	(REG_OK_FOR_STRREG_NONSTRICT_P, REG_OK_FOR_STRREG_STRICT_P,
	 REG_OK_FOR_STRREG_P): Remove.
	(HI_REGISTER_NAMES): Add extended registers.
	(ADDITIONAL_REGISTER_NAMES): Likewise.
	(QI_REGISTER_NAMES): Add 8bit extended registers.
	(DEBUG_REG): Support extended registers.
	* i386.c (regclass_map): Add extended registers.
	(dbx_register-map): Likewise.
	(svr4_dbx_register_map): Likewise.
	(print_reg): Support extended registers.
	(print_operand): Support 64bit operands.

From-SVN: r40348