From: Vladimir Chirikov <vchirikov@servicetitan.com>
Date: Tue, 25 Feb 2020 21:22:28 +0000 (+0300)
Subject: Improve Expression.Lambda<TDelegate> performance (#32768)
X-Git-Tag: submit/tizen/20210909.063632~9504
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=634b3484262cc4bc288c605cb1e6374cc76655a0;p=platform%2Fupstream%2Fdotnet%2Fruntime.git

Improve Expression.Lambda<TDelegate> performance (#32768)

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

Fix #32767
---

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 0d60e32..0e1ead7 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 @@ namespace System.Linq.Expressions
         {
             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>