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lib/libc/amd64: back out amd64 SIMD work

Authored by fuz on Thu, Sep 14, 5:56 AM.
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Due to some bugs being found, back out the amd64 SIMD libc work from
releng/14.0 ahead of the release and give these changes in a critical
part of FreeBSD some more time to mature. This was requested by @imp
and @kevans.

This patch set backs out D40693, D41333, D41349, D41442, and D41697.
Change sets D40729, D40730 (ffs), D41011 (bcmp integer overflow bug),
and D41050 (rtld bits) are not backed out. The intent is for this
backout to be a direct commit to releng/14.0 with the changes staying on
CURRENT and stable/14.

Sponsored by: The FreeBSD Foundation

Test Plan

passes a build test

Diff Detail

rG FreeBSD src repository
Lint Not Applicable
Tests Not Applicable

Event Timeline

fuz requested review of this revision.Thu, Sep 14, 5:56 AM
fuz created this revision.
This revision is now accepted and ready to land.Mon, Sep 18, 10:23 PM
This revision was automatically updated to reflect the committed changes.