[llvm] [SystemZ] SLP reductions: cost functions of reductions and scalarization (PR #112491)

[Alexey Bataev via llvm-commits]

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@@ -3032,10 +3032,9 @@ class BoUpSLP {
       SmallVectorImpl<SmallVector<const TreeEntry *>> &Entries,
       unsigned NumParts, bool ForOrder = false);
 
-  /// \returns the scalarization cost for this list of values. Assuming that
-  /// this subtree gets vectorized, we may need to insert the values from the
-  /// roots. This method calculates the cost of inserting the values.
-  /// \param ForPoisonSrc true if initial vector is poison, false otherwise.
+  /// \returns the cost of gathering (inserting) the values in \p VL into a
+  /// vector.  \param ForPoisonSrc true if initial vector is poison, false
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alexey-bataev wrote:

Try to reformat to make `\param` on a separate line

https://github.com/llvm/llvm-project/pull/112491