{"ast_node_type":"other","tokens":[{"end":60,"kind":"keyword","start":0,"text":"|"}]}
| M68k         | `a7`          | `sp`, `usp`, `ssp`, `isp` |
| M68k         | `a6`          | `fp`      |
| CSKY         | `r[0-3]`      | `a[0-3]`  |