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

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-analysis

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/125462.diff


1 Files Affected:

- (modified) llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h (+3-2) 


``````````diff
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:

``````````

</details>


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