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 9.46.2.2 Register Names
 .......................
 
 General-purpose registers are represented by predefined symbols of the
 form 'rN', where N represents a number between '0' and '63'.  However,
 the following registers have canonical names that must be used instead:
 
 'r54'
      sp
 
 'r55'
      lr
 
 'r56'
      sn
 
 'r57'
      idn0
 
 'r58'
      idn1
 
 'r59'
      udn0
 
 'r60'
      udn1
 
 'r61'
      udn2
 
 'r62'
      udn3
 
 'r63'
      zero
 
    The assembler will emit a warning if a numeric name is used instead
 of the non-numeric name.  The '.no_require_canonical_reg_names'
 assembler pseudo-op turns off this warning.
 '.require_canonical_reg_names' turns it back on.
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