[llvm] [Hexagon] Avoid repeated hash lookups (NFC) (PR #130545)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-hexagon

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/130545.diff


1 Files Affected:

- (modified) llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp (+4-3) 


``````````diff
diff --git a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
index c0baf301e0624..4bb1b1eb22eba 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp
@@ -2022,8 +2022,9 @@ static bool isTargetConstant(const SDValue &V) {
 }
 
 unsigned HexagonDAGToDAGISel::getUsesInFunction(const Value *V) {
-  if (GAUsesInFunction.count(V))
-    return GAUsesInFunction[V];
+  auto [It, Inserted] = GAUsesInFunction.try_emplace(V);
+  if (!Inserted)
+    return It->second;
 
   unsigned Result = 0;
   const Function &CurF = CurDAG->getMachineFunction().getFunction();
@@ -2033,7 +2034,7 @@ unsigned HexagonDAGToDAGISel::getUsesInFunction(const Value *V) {
       ++Result;
   }
 
-  GAUsesInFunction[V] = Result;
+  It->second = Result;
 
   return Result;
 }

``````````

</details>


https://github.com/llvm/llvm-project/pull/130545