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Using as

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General-purpose registers are represented by predefined symbols of the form `GRnnn' (for global registers) or `LRnnn' (for local registers), where nnn represents a number between 0 and 127, written with no leading zeros. The leading letters may be in either upper or lower case; for example, `gr13' and `LR7' are both valid register names.

You may also refer to general-purpose registers by specifying the register number as the result of an expression (prefixed with `%%' to flag the expression as a register number):
---where expression must be an absolute expression evaluating to a number between 0 and 255. The range [0, 127] refers to global registers, and the range [128, 255] to local registers.

In addition, as understands the following protected special-purpose register names for the AMD 29K family:

  vab    chd    pc0
  ops    chc    pc1
  cps    rbp    pc2
  cfg    tmc    mmu
  cha    tmr    lru

These unprotected special-purpose register names are also recognized:
  ipc    alu    fpe
  ipa    bp     inte
  ipb    fc     fps
  q      cr     exop

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