{"ast_node_type":"other","tokens":[{"end":121,"kind":"keyword","start":0,"text":"|"}]}
| SPARC        | `r0`/`g0`                               | This is always zero and cannot be used as inputs or outputs. |
| CSKY         | `r31`                                   | This is the TLS register.  |
| SPARC        | `r1`/`g1`                               | Used internally by LLVM. |