Introduce a temporary for discriminant value in MatchBranchSimplification #78191
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…tion The optimization introduces additional uses of the discriminant operand, but does not ensure that it is still valid to evaluate it or that it still evaluates to the same value. Evaluate it once at original position, and store the result in a new temporary.
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…as-schievink Rollup of 12 pull requests Successful merges: - rust-lang#75115 (`#[deny(unsafe_op_in_unsafe_fn)]` in sys/cloudabi) - rust-lang#76614 (change the order of type arguments on ControlFlow) - rust-lang#77610 (revise Hermit's mutex interface to support the behaviour of StaticMutex) - rust-lang#77830 (Simplify query proc-macros) - rust-lang#77930 (Do not ICE with TraitPredicates containing [type error]) - rust-lang#78069 (Fix const core::panic!(non_literal_str).) - rust-lang#78072 (Cleanup constant matching in exhaustiveness checking) - rust-lang#78119 (Throw core::panic!("message") as &str instead of String.) - rust-lang#78191 (Introduce a temporary for discriminant value in MatchBranchSimplification) - rust-lang#78272 (const_evaluatable_checked: deal with unused nodes + div) - rust-lang#78318 (TyCtxt: generate single impl block with `slice_interners` macro) - rust-lang#78327 (resolve: Relax macro resolution consistency check to account for any errors) Failed merges: r? `@ghost`
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The optimization introduces additional uses of the discriminant operand, but
does not ensure that it is still valid to evaluate it or that it still
evaluates to the same value.
Evaluate it once at original position, and store the result in a new temporary.
Follow up on #78151. The optimization remains disabled by default.
Closes #78239.