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

[Kazu Hirata via llvm-commits]

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

None

>From 1843cce76ae3f1f2cfc63e8b1d0915a7c0d49f3e Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sun, 9 Mar 2025 00:54:53 -0800
Subject: [PATCH] [Hexagon] Avoid repeated hash lookups (NFC)

---
 llvm/lib/Target/Hexagon/HexagonISelDAGToDAG.cpp | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

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;
 }