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

[Florian Hahn via llvm-commits]

================
@@ -14036,10 +14084,22 @@ bool SLPVectorizerPass::vectorizeStores(ArrayRef<StoreInst *> Stores,
 
       unsigned Sz = 1 + Log2_32(MaxVF) - Log2_32(MinVF);
       SmallVector<unsigned> CandidateVFs(Sz);
+      auto VFsToFill = make_range(CandidateVFs.begin(), CandidateVFs.end());
----------------
fhahn wrote:

If we start with the regular power-of-2 VFs first, then in many cases we vectorize with a power-of-2 VF smaller than the non-power-of-2 one eagerly.

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