| Issue |
60608
|
| Summary |
Backport 844430bcc377 to 16.x release branch
|
| Labels |
new issue
|
| Assignees |
|
| Reporter |
preames
|
This change fixes a recent and high impact regression. The flawed logic was introduced in Dec 22, by change [844430bcc377](https://reviews.llvm.org/rG844430bcc3778094ac0e0dd085062809b7f6d666).
This was recently exposed in a stage2 build of llvm-tablegen when we switched from using llvm::Optional to std::optional. The stars aligned in just the wrong way, and we started actively miscompiling idiomatic optional usage. std::optional<uint32_t> appears to use the top 32 bits of the word on RV64 for its tag.
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