Andres Freund <andres@anarazel.de> writes:
> On 2016-03-29 13:24:40 -0400, Tom Lane wrote:
>> AFAICS, lwarx/stwcx are specifically *word* wide.
> There's actually lbarx/stbcx - but it's not present in all ISAs. So I
> guess it's clear where to go.
Hm. We could certainly add a configure test to see if the local assembler
knows these instructions --- but it's not clear that we should depend on
compile-time environment to match run-time.
Googling suggests that these instructions came in with PPC ISA 2.06
which seems to date to 2010. So there's undoubtedly still production
hardware without them.
In the department of not-production hardware, I checked this on prairiedog
and got
/var/tmp/ccbQy9uG.s:1722:Invalid mnemonic 'lbarx'
/var/tmp/ccbQy9uG.s:1726:Invalid mnemonic 'stbcx.'
regards, tom lane