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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:
r54sp
r55lr
r56sn
r57idn0
r58idn1
r59udn0
r60udn1
r61udn2
r62udn3
r63zero
The assembler will emit a warning if a numeric name is used instead of
the canonical name. The .no_require_canonical_reg_names
assembler pseudo-op turns off this
warning. .require_canonical_reg_names turns it back on.