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Rollup merge of #98888 - RalfJung:interpret-checked-bin, r=oli-obk

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interpret: fix CheckedBinOp behavior when overflow checking is disabled

Adjusts the interpreter to https://github.com/rust-lang/rust/pull/98738.

r? `@oli-obk`
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Matthias Krüger 2022-07-05 17:08:11 +02:00 • committed by GitHub
commit cca43fe8e2
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5 changed files with 26 additions and 4 deletions
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compiler/rustc_middle/src/mir/syntax.rs
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@ -993,8 +993,9 @@ pub enum Rvalue<'tcx> {
/// Same as `BinaryOp`, but yields `(T, bool)` with a `bool` indicating an error condition.
///
/// When overflow checking is disabled, the error condition is false. Otherwise, the error
/// condition is determined as described below.
/// When overflow checking is disabled and we are generating run-time code, the error condition
/// is false. Otherwise, and always during CTFE, the error condition is determined as described
/// below.
///
/// For addition, subtraction, and multiplication on integers the error condition is set when
/// the infinite precision result would be unequal to the actual result.