[LLVMdev] Proposal: Move host CPU auto-detection out of the TargetMachine

[Richard Sandiford]

Jim Grosbach <grosbach at apple.com> writes:
>> On the other hand, I think it's good to run the tests on both z10 and z196,
>> since there were significant additions to the architecture in z196.
>> Until now we've been getting that by implicitly using -mcpu=z10 for
>> cross testing on the usual x86_64 buildbots and implicitly using
>> -mcpu=native (-mcpu=z196) on the z buildbot.
>> 
>> We could do it instead by having two llcs and FileChecks per
>> CodeGen/SystemZ test, which would give better cross-toolchain
>> coverage, but would almost double the test time.  Would that
>> still be OK?
>
> If you really want to run both variations of the tests, yes, absolutely,
> and that’s the right way to do it. Having the tests run differently in a
> cross-compile vs. a host-compile situation is exactly the sort of thing
> I’m hoping to move away from.

OK, in that case I'll do the SystemZ side if the x86 change goes in.

Thanks,
Richard