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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. |
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| README.md | ||
The codegen crate contains the code to convert from MIR into LLVM IR,
and then from LLVM IR into machine code. In general it contains code
that runs towards the end of the compilation process.
For more information about how codegen works, see the rustc dev guide.