aes: refactor NI backend #225
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tarcieri
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Feb 7, 2021
tarcieri
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- Uses array operations on the block buffer
- Uses loops where they don't appear to impact performance
- Uses array operations on the block buffer - Uses loops where they don't appear to impact performance
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Note: I haven't systematically determined this doesn't change the generated assembly. Preliminary benchmarking shows negligible impact. |
tarcieri
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Feb 7, 2021
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| // TODO(tarcieri): check performance impact / generated assembly changes | ||
| #![allow(clippy::needless_range_loop)] |
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Strangely clippy's suggested refactoring seemed to negatively impact performance?(!)
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Yeah, I've seen such behavior as well. Iterator based code probably makes it harder for LLVM to unroll the loops. Also subjectively, I think for such loops range loops result in a better, easier to understand code.
newpavlov
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Feb 7, 2021
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Feb 7, 2021
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