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| author | bors <bors@rust-lang.org> | 2022-11-26 08:56:20 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2022-11-26 08:56:20 +0000 |
| commit | 8841bee954ecf0e6820c9990feb3a76cb04e7d96 (patch) | |
| tree | 33cdcb23858966c692ec79816aaf6ca593b9eaca /compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp | |
| parent | f8a2e491ebec34113563cf8683f6fec2646cebb1 (diff) | |
| parent | b9a95d89902a6c9ba17dae21d84c2c04454bdddd (diff) | |
| download | rust-8841bee954ecf0e6820c9990feb3a76cb04e7d96.tar.gz rust-8841bee954ecf0e6820c9990feb3a76cb04e7d96.zip | |
Auto merge of #103556 - clubby789:specialize-option-partial-eq, r=scottmcm
Manually implement PartialEq for Option<T> and specialize non-nullable types This PR manually implements `PartialEq` and `StructuralPartialEq` for `Option`, which seems to produce slightly better codegen than the automatically derived implementation. It also allows specializing on the `core::num::NonZero*` and `core::ptr::NonNull` types, taking advantage of the niche optimization by transmuting the `Option<T>` to `T` to be compared directly, which can be done in just two instructions. A comparison of the original, new and specialized code generation is available [here](https://godbolt.org/z/dE4jxdYsa).
Diffstat (limited to 'compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp')
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