[Patch][LoopVectorize]Late evaluation of vectorization requirements

[Tyler Nowicki]

Please ignore the debug line in the LLVM late-evaluation patch. It won’t be part of the commit.

+      DEBUG(dbgs() << "LV: Emitting analysis message.\n”);

Tyler

> On Jul 27, 2015, at 3:23 PM, Tyler Nowicki <tnowicki at apple.com> wrote:
> 
> Hi Hal,
> 
> Thanks for the review! No worries about the delay.
> 
>>> Could I get a review of these patches for cfe and llvm?
>> 
>> Hi Tyler,
>> 
>> I'm apologize for the delay. I think this generally looks good, but I don't understand the motivation for introducing the additional FrontendOptions member. Why not just make a subclass of DiagnosticInfoOptimizationRemarkAnalysis that the frontend can handle specially (and detect using the normal isa/dyn_cast mechanism?\
> 
> The diagnostic handling code doesn’t use isa or dyn_cast, rather it uses switches to select between different types. I modified the patch to use a subclass rather than a member variable. Let me know what patch you think would work out better?
> 
> 
>>> I should have also said in my previous email that I am not thrilled
>>> by the need to use O3 in the clang-side test.
>> 
>> So using -O2 or using -fvectorize does not help?
> 
> Using -O1 with -fvectorize seems to work, at least it is a smaller set of passes than O3.
> 
> I attached the updated patches. I also noticed that DiagnosticInfoOptimizationBase::classof() was incorrectly implemented. It would need its own diagnostic kind, but that doesn’t make sense because you would never instantiate the base class. I thought it was best just to remove it. See the third patch.
> 
> Tyler
> 
> <LLVM-Late-evaluation-of-vectorization-requirements.patch>
> <Clang-Add-diagnostic-to-append-fp-commute-clang-options-to.patch>
> <LLVM-Removed-unused-and-broken-classoff-method-in-base-cl.patch>

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