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The assembly syntax for a register file entry is the "short" name for
a TIE register file followed by the index into that register file. For
example, the general-purpose AR
register file has a short name of
a
, so these registers are named a0
...a15
.
As a special feature, sp
is also supported as a synonym for
a1
. Additional registers may be added by processor configuration
options and by designer-defined TIE extensions. An initial `$'
character is optional in all register names.