[llvm] r191314 - set the cost of tiny trees to INT_MAX in SLP vectorizer to disable vectorization on them

[Chandler Carruth]

Test case? Justification? This seems somewhat arbitrary given the commit
log.


On Tue, Sep 24, 2013 at 12:26 PM, Yi Jiang <yjiang at apple.com> wrote:

> Author: yjiang
> Date: Tue Sep 24 12:26:43 2013
> New Revision: 191314
>
> URL: http://llvm.org/viewvc/llvm-project?rev=191314&view=rev
> Log:
> set the cost of tiny trees to INT_MAX in SLP vectorizer to disable
> vectorization on them
>
> Modified:
>     llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp
>
> Modified: llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp?rev=191314&r1=191313&r2=191314&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp (original)
> +++ llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp Tue Sep 24
> 12:26:43 2013
> @@ -947,7 +947,7 @@ int BoUpSLP::getTreeCost() {
>      if (!VectorizableTree.size()) {
>        assert(!ExternalUses.size() && "We should not have any external
> users");
>      }
> -    return 0;
> +    return INT_MAX;
>    }
>
>    unsigned BundleWidth = VectorizableTree[0].Scalars.size();
>
>
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