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Simd contains fix #104735
Simd contains fix #104735
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(rustbot has picked a reviewer for you, use r? to override) |
Hey! It looks like you've submitted a new PR for the library teams! If this PR contains changes to any Examples of
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r? @thomcc |
Great catch. Really subtle but makes sense after your fix. Marking as p=10 following the rationale in #104727 (comment) (soundness fix), but this patch shouldn't impact perf since it's not reverting an optimization. @bors r+ p=10 |
☀️ Test successful - checks-actions |
Finished benchmarking commit (ff8c8df): comparison URL. Overall result: no relevant changes - no action needed@rustbot label: -perf-regression Instruction countThis benchmark run did not return any relevant results for this metric. Max RSS (memory usage)ResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
CyclesResultsThis is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.
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Fixes #104726
The bug was introduced by an improvement late in the original PR (#103779) which added the backtracking when the last and first byte of the needle were the same. That changed the meaning of the variable for the last probe offset, which I should have split into the last byte offset and last probe offset. Not doing so lead to incorrect loop conditions.