[PATCH v1] powerpc64le: Revert "Optimized strcmp for power10"

[Carlos O'Donell]

On 6/16/25 4:19 PM, Paul Murphy wrote:
> Sachin,
> 
> Here is a patch which I think fixes the various vector register ABI
> violations for the power10 optimizations. The fix should be
> straightforward. I tested this on a P10 machine and didn't see any new
> failures. It's been a few years since I've posted a patch here; I
> recommend double checking my work. I missed this when I reviewed it.

Paul, Thank you for posting this!

Please post this in a distinct thread for review if you're looking
to contribute the patch upstream.

https://sourceware.org/glibc/wiki/Contribution%20checklist

As part of the glibc security team I'm going to go ahead with the
revert since I'd like the CVE fixed ASAP.

Sachin and I spoke briefly this morning in the glibc upstream patch
queue review meeting and we agreed to continue down the path of
reverting the problematic code.

Please feel free to work with Sachin getting improved and fixed
versions posted, reviewed and accepted. We can do this with more time
once the CVE is resolved.

I wonder if we cant get a generic test framework for testing if
caller preserved registers are actually preserved? :-)

-- 
Cheers,
Carlos.