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| author | bors <bors@rust-lang.org> | 2023-07-21 15:00:36 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2023-07-21 15:00:36 +0000 |
| commit | 557359f92512ca88b62a602ebda291f17a953002 (patch) | |
| tree | ca73fddeaf77447da11e326f27eea457a064b8a8 /compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp | |
| parent | 1e6c09a803fd543a98bfbe1624d697a55300a786 (diff) | |
| parent | 7f109086ee9458eb39f920fb04e4f37a97853701 (diff) | |
| download | rust-557359f92512ca88b62a602ebda291f17a953002.tar.gz rust-557359f92512ca88b62a602ebda291f17a953002.zip | |
Auto merge of #113166 - moulins:ref-niches-initial, r=oli-obk
Prototype: Add unstable `-Z reference-niches` option MCP: rust-lang/compiler-team#641 Relevant RFC: rust-lang/rfcs#3204 This prototype adds a new `-Z reference-niches` option, controlling the range of valid bit-patterns for reference types (`&T` and `&mut T`), thereby enabling new enum niching opportunities. Like `-Z randomize-layout`, this setting is crate-local; as such, references to built-in types (primitives, tuples, ...) are not affected. The possible settings are (here, `MAX` denotes the all-1 bit-pattern): | `-Z reference-niches=` | Valid range | |:---:|:---:| | `null` (the default) | `1..=MAX` | | `size` | `1..=(MAX- size)` | | `align` | `align..=MAX.align_down_to(align)` | | `size,align` | `align..=(MAX-size).align_down_to(align)` | ------ This is very WIP, and I'm not sure the approach I've taken here is the best one, but stage 1 tests pass locally; I believe this is in a good enough state to unleash this upon unsuspecting 3rd-party code, and see what breaks.
Diffstat (limited to 'compiler/rustc_llvm/llvm-wrapper/CoverageMappingWrapper.cpp')
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