89e0576bd3
Always permit ConstProp to exploit arithmetic identities Fixes https://github.com/rust-lang/rust/issues/72751 Initially, I thought I would need to enable operand propagation then do something else, but actually https://github.com/rust-lang/rust/pull/74491 already has the fix for the issue in question! It looks like this optimization was put under MIR opt level 3 due to possible soundness/stability implications, then demoted further to MIR opt level 4 when MIR opt level 2 became associated with `--release`. Perhaps in the past we were doing CTFE on optimized MIR? We aren't anymore, so this optimization has no stability implications. r? `@oli-obk` |
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Cargo.toml |