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 9.26.2.3 Register Names
 .......................
 
 General-purpose registers are represented by predefined symbols of the
 form `rN' (for global registers), where N represents a number between
 `0' and `15'.  The leading letters may be in either upper or lower
 case; for example, `r13' and `R7' are both valid register names.
 
    Register names `PC', `SP' and `SR' cannot be used as register names
 and will be treated as variables. Use `r0', `r1', and `r2' instead.
 

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