Scott McMurray 986d9f104b 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.

2024-04-18 18:11:21 -07:00

3.6 KiB

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