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gh-125022: add support for simple SIMD features detection#125011

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@picnixzpicnixz commentedOct 5, 2024•
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In#124951, there has been some initial discussion on improving the performances of base64 and possibly{bytearray,bytes,str}.translate using SIMD instructions.

More generally, if we want to use specific SIMD instructions, it'd be good if we at least know whether we can use them or not. This PR is a PoC, experimental and (hence the skip news).

Note that the detection is essentially based on what was done in the blake2 module (though the flags being detected are different in this case but we can always add all those that are needed). To prepare for a harder detection of AVX instructions support, I added all the flags that are known to CPUID and possibly relevant. Note that more work needs to be done for a production use, especially in autoconf I think.

Note

The detection of a wider large family of CPUs (here we just assume Intel for simplicity and because we don't want to be overcomplicated for now) is still an ongoing work.

cc@gpshead

@picnixzpicnixz added skip issue skip news buildThe build process and cross-build labelsOct 5, 2024
@picnixzpicnixz marked this pull request as ready for reviewOctober 6, 2024 09:49
@picnixzpicnixz changed the titleAdd support for simple SIMD features detection in autoconf (PoC)gh-125022: add support for simple SIMD features detection (PoC)Oct 6, 2024
@picnixzpicnixz changed the titlegh-125022: add support for simple SIMD features detection (PoC)gh-125022: add support for simple SIMD features detectionOct 7, 2024
@picnixzpicnixz marked this pull request as draftApril 8, 2025 10:30
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PoC for using SIMD detection for blake2 and HMAC:19b7d86. I'll revert that commit if needs arise.

@picnixzpicnixz added the 🔨 test-with-buildbotsTest PR w/ buildbots; report in status section labelApr 8, 2025
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🤖 New build scheduled with the buildbot fleet by@picnixz for commit19b7d86 🤖

Results will be shown at:

https://buildbot.python.org/all/#/grid?branch=refs%2Fpull%2F125011%2Fmerge

If you want to schedule another build, you need to add the🔨 test-with-buildbots label again.

@bedevere-botbedevere-bot removed the 🔨 test-with-buildbotsTest PR w/ buildbots; report in status section labelApr 8, 2025
@picnixzpicnixz marked this pull request as ready for reviewApril 8, 2025 13:39
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