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(as.info)D10V-Regs

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Register Names
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   You can use the predefined symbols `r0' through `r15' to refer to
the D10V registers.  You can also use `sp' as an alias for `r15'.  The
accumulators are `a0' and `a1'.  There are special register-pair names
that may optionally be used in opcodes that require even-numbered
registers. Register names are not case sensitive.

   Register Pairs
`r0-r1'

`r2-r3'

`r4-r5'

`r6-r7'

`r8-r9'

`r10-r11'

`r12-r13'

`r14-r15'
   The D10V also has predefined symbols for these control registers and
status bits:
`psw'
     Processor Status Word

`bpsw'
     Backup Processor Status Word

`pc'
     Program Counter

`bpc'
     Backup Program Counter

`rpt_c'
     Repeat Count

`rpt_s'
     Repeat Start address

`rpt_e'
     Repeat End address

`mod_s'
     Modulo Start address

`mod_e'
     Modulo End address

`iba'
     Instruction Break Address

`f0'
     Flag 0

`f1'
     Flag 1

`c'
     Carry flag