[llvm] [SelectionDAG] late init DeferredNodes (PR #123461)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-selectiondag

Author: klensy (klensy)

<details>
<summary>Changes</summary>

No need to init `SmallVector` (even stack allocated) if we can exit literally on next line.

---
Full diff: https://github.com/llvm/llvm-project/pull/123461.diff


1 Files Affected:

- (modified) llvm/include/llvm/CodeGen/SelectionDAGNodes.h (+1-1) 


``````````diff
diff --git a/llvm/include/llvm/CodeGen/SelectionDAGNodes.h b/llvm/include/llvm/CodeGen/SelectionDAGNodes.h
index 03899493847b39..49467ce0a54cd0 100644
--- a/llvm/include/llvm/CodeGen/SelectionDAGNodes.h
+++ b/llvm/include/llvm/CodeGen/SelectionDAGNodes.h
@@ -916,10 +916,10 @@ END_TWO_BYTE_PACK()
                                    SmallVectorImpl<const SDNode *> &Worklist,
                                    unsigned int MaxSteps = 0,
                                    bool TopologicalPrune = false) {
-    SmallVector<const SDNode *, 8> DeferredNodes;
     if (Visited.count(N))
       return true;
 
+    SmallVector<const SDNode *, 8> DeferredNodes;
     // Node Id's are assigned in three places: As a topological
     // ordering (> 0), during legalization (results in values set to
     // 0), new nodes (set to -1). If N has a topolgical id then we

``````````

</details>


https://github.com/llvm/llvm-project/pull/123461