From 8d80b5041dc3b82cedb8ef2ec27b19407be06206 Mon Sep 17 00:00:00 2001
From: vchirikov <vchirikov@servicetitan.com>
Date: Sun, 23 Feb 2020 02:19:34 +0300
Subject: [PATCH] Improve Expression.Lambda<TDelegate> performance

Unnecessary cache call in Expression.Lambda<TDelegate>
(with reflection in worst scenario) has been removed.

Fix #32767
---
 .../src/System/Linq/Expressions/LambdaExpression.cs         | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/libraries/System.Linq.Expressions/src/System/Linq/Expressions/LambdaExpression.cs b/src/libraries/System.Linq.Expressions/src/System/Linq/Expressions/LambdaExpression.cs
index 0d60e3236e09b3..0e1ead78c1cb9c 100644
--- a/src/libraries/System.Linq.Expressions/src/System/Linq/Expressions/LambdaExpression.cs
+++ b/src/libraries/System.Linq.Expressions/src/System/Linq/Expressions/LambdaExpression.cs
@@ -687,7 +687,11 @@ public static Expression<TDelegate> Lambda<TDelegate>(Expression body, string? n
         {
             ReadOnlyCollection<ParameterExpression> parameterList = parameters.ToReadOnly();
             ValidateLambdaArgs(typeof(TDelegate), ref body, parameterList, nameof(TDelegate));
-            return (Expression<TDelegate>)CreateLambda(typeof(TDelegate), body, name, tailCall, parameterList);
+#if FEATURE_COMPILE
+            return Expression<TDelegate>.Create(body, name, tailCall, parameterList);
+#else
+            return ExpressionCreator<TDelegate>.CreateExpressionFunc(body, name, tailCall, parameterList);
+#endif
         }
 
         /// <summary>