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(as.info)SH-Regs

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Register Names
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   You can use the predefined symbols `r0', `r1', `r2', `r3', `r4',
`r5', `r6', `r7', `r8', `r9', `r10', `r11', `r12', `r13', `r14', and
`r15' to refer to the SH registers.

   The SH also has these control registers:

`pr'
     procedure register (holds return address)

`pc'
     program counter

`mach'
`macl'
     high and low multiply accumulator registers

`sr'
     status register

`gbr'
     global base register

`vbr'
     vector base register (for interrupt vectors)