simd_add/sub/mul/neg: document overflow behavior#153675
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rust-bors[bot] merged 1 commit intorust-lang:mainfrom Mar 27, 2026
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simd_add/sub/mul/neg: document overflow behavior#153675rust-bors[bot] merged 1 commit intorust-lang:mainfrom
rust-bors[bot] merged 1 commit intorust-lang:mainfrom
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Some changes occurred to the platform-builtins intrinsics. Make sure the cc @antoyo, @GuillaumeGomez, @bjorn3, @calebzulawski, @programmerjake Some changes occurred to the intrinsics. Make sure the CTFE / Miri interpreter |
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r? @scottmcm rustbot has assigned @scottmcm. Use Why was this reviewer chosen?The reviewer was selected based on:
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@scottmcm friendly reminder that this is waiting on your review. :) Should be an easy one, it just clarifies some non-user-facing comments. |
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Ah, yup, all looks good! |
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JonathanBrouwer
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simd_add/sub/mul/neg: document overflow behavior `simd_neg` had an odd comment about overflow not being UB, without saying what the behavior is instead. Replace that by just saying this uses wrapping arithmetic, and add the same for add/sub/mul. div/rem are already documented to cause UB on div-by-zero and min-div-by-minus-one, and shl/shr cause UB on too large shift amounts.
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simd_add/sub/mul/neg: document overflow behavior `simd_neg` had an odd comment about overflow not being UB, without saying what the behavior is instead. Replace that by just saying this uses wrapping arithmetic, and add the same for add/sub/mul. div/rem are already documented to cause UB on div-by-zero and min-div-by-minus-one, and shl/shr cause UB on too large shift amounts.
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Rollup of 7 pull requests Successful merges: - #152457 (Pass -pg to linker when using -Zinstrument-mcount) - #154031 (Remove divergence check from check_expr_array) - #154418 (move many tests out of `ui/unsafe`) - #153662 (Suggest fully qualified path on method name collision) - #153675 (simd_add/sub/mul/neg: document overflow behavior) - #154110 (Change "error finalizing incremental compilation" text and emit it as a note, not a warning) - #154430 (Create GPU target notification group)
Zalathar
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simd_add/sub/mul/neg: document overflow behavior `simd_neg` had an odd comment about overflow not being UB, without saying what the behavior is instead. Replace that by just saying this uses wrapping arithmetic, and add the same for add/sub/mul. div/rem are already documented to cause UB on div-by-zero and min-div-by-minus-one, and shl/shr cause UB on too large shift amounts.
rust-bors bot
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Mar 27, 2026
Rollup of 7 pull requests Successful merges: - #152457 (Pass -pg to linker when using -Zinstrument-mcount) - #154031 (Remove divergence check from check_expr_array) - #154418 (move many tests out of `ui/unsafe`) - #154441 (bootstrap: force a CI LLVM stamp bump) - #153662 (Suggest fully qualified path on method name collision) - #153675 (simd_add/sub/mul/neg: document overflow behavior) - #154430 (Create GPU target notification group)
rust-bors bot
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Mar 27, 2026
Rollup of 6 pull requests Successful merges: - #152457 (Pass -pg to linker when using -Zinstrument-mcount) - #154031 (Remove divergence check from check_expr_array) - #154418 (move many tests out of `ui/unsafe`) - #154441 (bootstrap: force a CI LLVM stamp bump) - #153675 (simd_add/sub/mul/neg: document overflow behavior) - #154430 (Create GPU target notification group)
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simd_neghad an odd comment about overflow not being UB, without saying what the behavior is instead. Replace that by just saying this uses wrapping arithmetic, and add the same for add/sub/mul. div/rem are already documented to cause UB on div-by-zero and min-div-by-minus-one, and shl/shr cause UB on too large shift amounts.