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| author | Scott McMurray <scottmcm@users.noreply.github.com> | 2024-04-17 23:55:35 -0700 |
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| committer | Scott McMurray <scottmcm@users.noreply.github.com> | 2024-04-18 18:11:21 -0700 |
| commit | 986d9f104b2da25f7388ad824b9868c3ce1e5f21 (patch) | |
| tree | 7ac1d3527e66ce610f6a69835bc5369f8334ff14 /compiler/rustc_errors/src | |
| parent | e3181b091e88321f5ea149afed6db0edf0a4f37b (diff) | |
| download | rust-986d9f104b2da25f7388ad824b9868c3ce1e5f21.tar.gz rust-986d9f104b2da25f7388ad824b9868c3ce1e5f21.zip | |
Make `checked` ops emit *unchecked* LLVM operations where feasible
For things with easily pre-checked overflow conditions -- shifts and unsigned subtraction -- write then checked methods in such a way that we stop emitting wrapping versions of them. For example, today <https://rust.godbolt.org/z/qM9YK8Txb> neither ```rust a.checked_sub(b).unwrap() ``` nor ```rust a.checked_sub(b).unwrap_unchecked() ``` actually optimizes to `sub nuw`. After this PR they do.
Diffstat (limited to 'compiler/rustc_errors/src')
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