llvm dev - Nov 2016 - Loop Vectorize: Testing cost model driven transformations

On Tue, Nov 29, 2016 at 5:11 PM, Adam Nemet via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> Do we need a new (loop-vectorizer-specific) command line option for this?
> Don’t we get the default TTI if the target is unspecified in the test?

I think you're right! It looks like I am getting the default TTI when the
target is left unspecified. I was assuming it would default to whatever the
host is, but this doesn't seem to be the case. I guess this is a non-issue
after all, as long as we don't specify a triple in the target-independent
tests. And it looks like Michael cleaned that all up in r283512.

Thanks!

-- Matt
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Thanks Matt!

So, just to make sure I understand, what is getting a specific TTI in llc
triggered off? -mcpu?

On Tue, Nov 29, 2016 at 2:49 PM, Matthew Simpson via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
>
> On Tue, Nov 29, 2016 at 5:11 PM, Adam Nemet via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Do we need a new (loop-vectorizer-specific) command line option for
>> this?  Don’t we get the default TTI if the target is unspecified in the
>> test?
>
>
> I think you're right! It looks like I am getting the default TTI when
the
> target is left unspecified. I was assuming it would default to whatever the
> host is, but this doesn't seem to be the case. I guess this is a
non-issue
> after all, as long as we don't specify a triple in the
target-independent
> tests. And it looks like Michael cleaned that all up in r283512.
>
> Thanks!
>
> -- Matt
>
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
>
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On Wed, Nov 30, 2016 at 1:04 PM, Michael Kuperstein via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> So, just to make sure I understand, what is getting a specific TTI in llc
> triggered off? -mcpu?

Right, TTI would be determined by the target specified in the IR or set
explicitly with the -m flags. My understanding is that if the target is
left unspecified in the IR and not set with the -m flags, llc will generate
code for the default target listed in the output of "llc --version".

-- Matt
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