[llvm] [LV] Add initial support for vectorizing literal struct return values (PR #109833)

[Benjamin Maxwell via llvm-commits]

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@@ -8652,6 +8660,15 @@ VPWidenRecipe *VPRecipeBuilder::tryToWiden(Instruction *I,
       NewOps[1] = GetConstantViaSCEV(NewOps[1]);
     }
     return new VPWidenRecipe(*I, make_range(NewOps.begin(), NewOps.end()));
+  }
+  case Instruction::ExtractValue: {
+    SmallVector<VPValue *> NewOps(Operands);
+    Type *I32Ty = IntegerType::getInt32Ty(I->getContext());
+    for (unsigned Idx : cast<ExtractValueInst>(I)->getIndices())
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MacDue wrote:

We can't reach here with multiple indices (due to the limits on struct-vectorization). Writing the for-loop was just a little easier. Anyway, I've removed this and added an extra assert now :+1: 

https://github.com/llvm/llvm-project/pull/109833