def operand_types {{
    'sb' : ('signed int', 8),
    'ub' : ('unsigned int', 8),
    'shw' : ('signed int', 16),
    'uhw' : ('unsigned int', 16),
    'sw' : ('signed int', 32),
    'uw' : ('unsigned int', 32),
    'sdw' : ('signed int', 64),
    'udw' : ('unsigned int', 64),
    'sf' : ('float', 32),
    'df' : ('float', 64),
    'qf' : ('float', 128)
}};

def operands {{
    'Rd': ('IntReg', 'uw', 'RD', 'IsInteger', 1),
    'Rs': ('IntReg', 'uw', 'RS', 'IsInteger', 2),
    'Rt': ('IntReg', 'uw', 'RT', 'IsInteger', 3),

    'IntImm': ('IntReg', 'uw', 'INTIMM', 'IsInteger', 3),
    'Sa': ('IntReg', 'uw', 'SA', 'IsInteger', 4),

    'Fd': ('FloatReg', 'sf', 'FD', 'IsFloating', 1),
    'Fs': ('FloatReg', 'sf', 'FS', 'IsFloating', 2),
    'Ft': ('FloatReg', 'sf', 'FT', 'IsFloating', 3),

    'Mem': ('Mem', 'udw', None, ('IsMemRef', 'IsLoad', 'IsStore'), 4)

    #'NPC': ('NPC', 'uq', None, ( None, None, 'IsControl' ), 4),
    #'Runiq': ('ControlReg', 'uq', 'Uniq', None, 1),
    #'FPCR':  ('ControlReg', 'uq', 'Fpcr', None, 1),
    # The next two are hacks for non-full-system call-pal emulation
    #'R0':  ('IntReg', 'uq', '0', None, 1),
    #'R16': ('IntReg', 'uq', '16', None, 1)
}};