[llvm] [LV] Keep duplicate recipes in VPExpressionRecipe (PR #156976)

[Sam Tebbs via llvm-commits]

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@@ -2801,21 +2800,31 @@ VPExpressionRecipe::VPExpressionRecipe(
   // create new temporary VPValues for all operands defined by a recipe outside
   // the expression. The original operands are added as operands of the
   // VPExpressionRecipe itself.
+
+  SmallMapVector<VPValue *, VPValue *, 4> OperandPlaceholders;
   for (auto *R : ExpressionRecipes) {
     for (const auto &[Idx, Op] : enumerate(R->operands())) {
       auto *Def = Op->getDefiningRecipe();
       if (Def && ExpressionRecipesAsSetOfUsers.contains(Def))
         continue;
       addOperand(Op);
-      LiveInPlaceholders.push_back(new VPValue());
-      R->setOperand(Idx, LiveInPlaceholders.back());
+      VPValue *Tmp = new VPValue();
+      OperandPlaceholders[Op] = Tmp;
+      LiveInPlaceholders.push_back(Tmp);
     }
   }
+
+  for (auto *R : ExpressionRecipes)
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SamTebbs33 wrote:

The latest commit has actually eliminated this behavioural change so I don't think we need to document anything, but I can do that as a follow-up if that changes.

https://github.com/llvm/llvm-project/pull/156976