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Fix chacha performance #1023

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merged 1 commit into from
Aug 28, 2020
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Fix chacha performance #1023

merged 1 commit into from
Aug 28, 2020

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vks
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@vks vks commented Aug 24, 2020 •
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This reverts a change from #979 that introduced a massive performance regression by disabling SIMD for rand_chacha.

Likely, the behavior of ppv-lite86 should rather be fixed (cryptocorrosion/cryptocorrosion#35). This change serves as a workaround until a fixed version is available.

Fixes #1017.

cc @kazcw

@vks
Fix chacha performance
ad2ea0a 
This reverts a change from rust-random#979 that introduced a massive performance
regression by disabling SIMD for `rand_chacha`.

Likely, the behavior of `ppv-lite86` should rather be fixed. This change
serves as a workaround until a fixed version is available.

Fixes rust-random#1017.
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dhardy commented Aug 26, 2020

The last rand_chacha release is 0.2.2 which is before #979, so this doesn't affect a release version. Given that, we should wait a little while at least for @kazcw to respond.

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vks commented Aug 26, 2020

Fair enough, we can defer merging this until either ppv-lite86 is fixed and this PR becomes obsolete or until the next rand_chacha version is released.

dhardy
dhardy approved these changes Aug 28, 2020
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ppv-lite86 is not a public dependency, so there's no harm in merging this now @kazcw releasing v0.3 of ppv-lite86 which we can switch to with a patch release.

@vks vks merged commit fbcfa22 into rust-random:master Aug 28, 2020
@vks vks deleted the fix-chacha-perf branch August 28, 2020 16:07
@dhardy dhardy mentioned this pull request Dec 7, 2020
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Simd not used for rand_chacha
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