[Hexagon] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-backend-hexagon

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/131719.diff

1 Files Affected:

• (modified) llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp (+1-4)

diff --git a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
index 4bb1b1eb22eba..53943de3bc597 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
@@ -2437,10 +2437,7 @@ void HexagonDAGToDAGISel::rebalanceAddressTrees() {
         continue;
 
       // This root node has already been processed
-      if (RootWeights.count(N))
-        continue;
-
-      RootWeights[N] = -1;
+      RootWeights.try_emplace(N, -1);
     }
 
     // Balance node itself