[llvm] [VPlan] Skip uses-scalars restriction if one of ops needs broadcast. (PR #168246)

[Florian Hahn via llvm-commits]

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@@ -1425,32 +1425,33 @@ static void narrowToSingleScalarRecipes(VPlan &Plan) {
         continue;
       }
 
-      // Skip recipes that aren't single scalars or don't have only their
-      // scalar results used. In the latter case, we would introduce extra
-      // broadcasts.
+      // Skip recipes that aren't single scalars or when conversion to
+      // single-scalar does not introduce additional broadcasts. That is, either
+      // only the scalars of the recipe are used, or at least one of the
+      // operands would require a broadcast. In the latter case, the
+      // single-scalar may need to be broadcasted, but another broadcast is
+      // removed. scalar results used. In the latter case, we would introduce
+      // extra broadcasts.
       if (!vputils::isSingleScalar(RepOrWidenR) ||
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fhahn wrote:

done thanks

https://github.com/llvm/llvm-project/pull/168246