[llvm] [SLP] Initial vectorization of non-power-of-2 ops. (PR #77790)

[Alexey Bataev via llvm-commits]

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@@ -2806,6 +2810,9 @@ class BoUpSLP {
                           SmallVectorImpl<Value *> *OpScalars = nullptr,
                           SmallVectorImpl<Value *> *AltScalars = nullptr) const;
 
+    /// Return true if this is a non-power-of-2 node.
+    bool isNonPowOf2Vec() const { return !isPowerOf2_32(Scalars.size()); }
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alexey-bataev wrote:

What if ReuseShuffleIndices is not empty? Will it work?Can you add a test?

https://github.com/llvm/llvm-project/pull/77790