[llvm] [SLP] Support ordered FAdd reductions in SLPVectorizer (PR #146570)

[Alexey Bataev via llvm-commits]

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@@ -1850,6 +1855,11 @@ class BoUpSLP {
     return VectorizableTree.front()->Scalars;
   }
 
+  bool areAllEntriesIdentityOrdered() const {
+    return all_of(VectorizableTree,
+                  [&](auto &Entry) { return Entry->ReorderIndices.empty(); });
+  }
+
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alexey-bataev wrote:

Unused

https://github.com/llvm/llvm-project/pull/146570