{
  "$type": "site.standard.document",
  "bskyPostRef": {
    "cid": "bafyreid277pcxctzwsrddwrnobmrgmxcpqj7knoszrwhln3yjbjlfglteu",
    "uri": "at://did:plc:ivbknywyskln22er3nkssdhl/app.bsky.feed.post/3mokcuo7ohib2"
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  "path": "/t/should-pgo-automatically-compile-hot-code-o3-and-cold-code-oz/24401#post_2",
  "publishedAt": "2026-06-17T20:11:01.000Z",
  "site": "https://internals.rust-lang.org",
  "textContent": "Note that anything here would basically be an LLVM change, so you might want to raise it with them. I don't think rust itself actually uses the PGO information in any meaningful way. (At most if forwards things along.) I don't think it needs to be a different opt level; PGO can just make other choices with the information it has when you use it.",
  "title": "Should PGO automatically compile hot code O3 and cold code Oz?"
}