{"ast_node_type":"other","tokens":[{"end":240,"kind":"keyword","start":0,"text":"|"}]}
| MIPS         | `$0` or `$zero`                         | This is a constant zero register which can't be modified.                                                                                                                           |
| All          | `r19` (Hexagon), `r29` (PowerPC), `r30` (PowerPC) | These are used internally by LLVM as "base pointer" for functions with complex stack frames.                                                                              |
| MIPS         | `$1` or `$at`                           | Reserved for assembler.                                                                                                                                                             |