[issue35752] test_buffer fails on ppc64le: memoryview pack_single() is miscompiled

[STINNER Victor]

STINNER Victor <vstinner at redhat.com> added the comment:

> This is a performance sensitive function, so I prefer not to add
volatile.

I don't suggest to use volatile. I'm just pointing to the function causing the bug and I said that volatile worked for me :-)

I made my tests on:

* Red Hat Enterprise Linux release 8.0 Beta (Ootpa)
* gcc (GCC) 8.2.1 20180905 (Red Hat 8.2.1-3)
* Linux kernel 4.18.0-56.el8.ppc64le
* uname -p: ppc64le

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