[llvm] [Analysis] Avoid repeated hash lookups (NFC) (PR #125462)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/125462

None

>From a73f1f4f4f293e04e35cd4fde20305eb8c960584 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sun, 2 Feb 2025 22:56:10 -0800
Subject: [PATCH] [Analysis] Avoid repeated hash lookups (NFC)

---
 llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h b/llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h
index 6eb1aca1cf76ad..872746b7df5ca9 100644
--- a/llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h
+++ b/llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h
@@ -944,10 +944,11 @@ class SCEVLoopAddRecRewriter
       Operands.push_back(visit(Op));
 
     const Loop *L = Expr->getLoop();
-    if (0 == Map.count(L))
+    auto It = Map.find(L);
+    if (It == Map.end())
       return SE.getAddRecExpr(Operands, L, Expr->getNoWrapFlags());
 
-    return SCEVAddRecExpr::evaluateAtIteration(Operands, Map[L], SE);
+    return SCEVAddRecExpr::evaluateAtIteration(Operands, It->second, SE);
   }
 
 private: