gh-125022: add support for simple SIMD features detection

[picnixz]

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

• Issue: Provide detection for SIMD features in autoconf and at runtime #125022

[picnixz]

!buildbot AMD64 FreeBSD14 PR

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[picnixz]

!buildbot AMD64 FreeBSD14 PR

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The command will test the builders whose names match following regular expression: AMD64 FreeBSD14 PR

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[picnixz]

!buildbot AMD64 FreeBSD14 PR

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit c6cf903 🤖

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The command will test the builders whose names match following regular expression: AMD64 FreeBSD14 PR

The builders matched are:

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[picnixz]

!buildbot AMD64 FreeBSD14 PR

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit 498518f 🤖

Results will be shown at:

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The command will test the builders whose names match following regular expression: AMD64 FreeBSD14 PR

The builders matched are:

• AMD64 FreeBSD14 PR

[picnixz]

!buildbot AMD64 FreeBSD14 PR

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit 3d56d93 🤖

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The command will test the builders whose names match following regular expression: AMD64 FreeBSD14 PR

The builders matched are:

• AMD64 FreeBSD14 PR

[picnixz]

!buildbot AMD64 FreeBSD14 PR

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🤖 New build scheduled with the buildbot fleet by @picnixz for commit 08daa8a 🤖

Results will be shown at:

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The command will test the builders whose names match following regular expression: AMD64 FreeBSD14 PR

The builders matched are:

• AMD64 FreeBSD14 PR

[picnixz]

I suspect something actually was wrong on FreeBSD/AMD side as others had similar issues. So I just removed XGETBV support. We don't really need it and I think I'll also get rid of other fields that we don't need to use now (but I'll keep their macros around).

[bedevere-bot]

🤖 New build scheduled with the buildbot fleet by @picnixz for commit 79eb72d 🤖

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

[github-actions]

This PR is stale because it has been open for 30 days with no activity.