Re: [PATCH 0/2] tcg/s390x: Fix chacha20-s390

[Michael Tokarev]

18.01.2024 00:36, Richard Henderson:
> So it turns out the regression exposed by "Optimize env memory operations"
> is caused by an s390x host encoding error.  This is the first time that we
> have had sufficient register pressure to use more than a few vector
> registers at the same time.
>
> As such, the testcase itself is interesting, since nothing else in our
> testsuite generates translation blocks with quite so many vector insns
> with more than 16 simultaneously live values.

Tested-by: Michael Tokarev <mjt@tls.msk.ru>

Both changes - the fix and the testsuite.  With several (debian) kernels on
actual s390x hw and on a few other architectures as well.

Why the problem didn't occur on non-s390x *host*?  As I noted in my initial
email, the testcase worked on amd64 host but not on s390x host..

Thank you for the good work Richard!

/mjt