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

[David Sherwood via llvm-commits]

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@@ -1341,6 +1341,15 @@ void VPWidenRecipe::execute(VPTransformState &State) {
     State.addMetadata(V, dyn_cast_or_null<Instruction>(getUnderlyingValue()));
     break;
   }
+  case Instruction::ExtractValue: {
+    assert(getNumOperands() == 2 && "expected single level extractvalue");
+    Value *Op = State.get(getOperand(0));
+    auto *CI = cast<ConstantInt>(getOperand(1)->getLiveInIRValue());
+    unsigned Idx = CI->getZExtValue();
+    Value *Extract = Builder.CreateExtractValue(Op, Idx);
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david-arm wrote:

Perhaps just write as:

```
  Value *Extract = Builder.CreateExtractValue(Op, CI->getZExtValue());
```

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