{
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  "path": "/t/could-you-borrow-a-bit/24300#post_13",
  "publishedAt": "2026-05-18T13:29:46.000Z",
  "site": "https://internals.rust-lang.org",
  "textContent": "IIUC on RISC-V you also can not freely use the higher address bits since the spec mandates that 64-bit addresses \"must have bits 63-48 all equal to bit 47, or else a page-fault exception will occur.\" You probably could mask the bits on each access, but it's likely to be inefficient and not compatible with hypothetical CHERI-like hardware.",
  "title": "Could you borrow a bit?"
}