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(as.info)SH64-Regs

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Register Names
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   You can use the predefined symbols `r0' through `r63' to refer to
the SH64 general registers, `cr0' through `cr63' for control registers,
`tr0' through `tr7' for target address registers, `fr0' through `fr63'
for single-precision floating point registers, `dr0' through `dr62'
(even numbered registers only) for double-precision floating point
registers, `fv0' through `fv60' (multiples of four only) for
single-precision floating point vectors, `fp0' through `fp62' (even
numbered registers only) for single-precision floating point pairs,
`mtrx0' through `mtrx48' (multiples of 16 only) for 4x4 matrices of
single-precision floating point registers, `pc' for the program
counter, and `fpscr' for the floating point status and control register.

   You can also refer to the control registers by the mnemonics `sr',
`ssr', `pssr', `intevt', `expevt', `pexpevt', `tra', `spc', `pspc',
`resvec', `vbr', `tea', `dcr', `kcr0', `kcr1', `ctc', and `usr'.