[llvm] [LLVM][VPlan] Keep all VPBlend masks until VPlan transformation. (PR #104015)

[via llvm-commits]

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@@ -989,15 +989,47 @@ void VPlanTransforms::clearReductionWrapFlags(VPlan &Plan) {
 /// Try to simplify recipe \p R.
 static void simplifyRecipe(VPRecipeBase &R, VPTypeAnalysis &TypeInfo) {
   using namespace llvm::VPlanPatternMatch;
-  // Try to remove redundant blend recipes.
+
   if (auto *Blend = dyn_cast<VPBlendRecipe>(&R)) {
-    VPValue *Inc0 = Blend->getIncomingValue(0);
+    // Try to remove redundant blend recipes.
+    SmallPtrSet<VPValue *, 4> UniqueValues;
+    if (Blend->isNormalized() || !match(Blend->getMask(0), m_False()))
+      UniqueValues.insert(Blend->getIncomingValue(0));
     for (unsigned I = 1; I != Blend->getNumIncomingValues(); ++I)
-      if (Inc0 != Blend->getIncomingValue(I) &&
-          !match(Blend->getMask(I), m_False()))
-        return;
-    Blend->replaceAllUsesWith(Inc0);
+      if (!match(Blend->getMask(I), m_False()))
+        UniqueValues.insert(Blend->getIncomingValue(I));
+
+    if (UniqueValues.size() == 1) {
+      Blend->replaceAllUsesWith(*UniqueValues.begin());
+      Blend->eraseFromParent();
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ayalz wrote:

Worth running recursivelyDeleteDeadRecipes() in this case too - on all masks? Or does the elimination of Blend here suffice to trigger dce.

https://github.com/llvm/llvm-project/pull/104015