Logo Questions Linux Laravel Mysql Ubuntu Git Menu
 

C# delegate compiler optimisation

I have started to use anonymous delegates a lot in C# and I have begun to wonder how efficient the complier or runtime is in removing them from the code that is actually run and I haven't seen this detailed anywhere?

Is it clever enough at all to inline them and collapse recursive uses that could be statically deduced?

like image 525
iam Avatar asked Jun 02 '10 14:06

iam


People also ask

What C is used for?

C programming language is a machine-independent programming language that is mainly used to create many types of applications and operating systems such as Windows, and other complicated programs such as the Oracle database, Git, Python interpreter, and games and is considered a programming foundation in the process of ...

What is the full name of C?

In the real sense it has no meaning or full form. It was developed by Dennis Ritchie and Ken Thompson at AT&T bell Lab. First, they used to call it as B language then later they made some improvement into it and renamed it as C and its superscript as C++ which was invented by Dr.

What is C in C language?

What is C? C is a general-purpose programming language created by Dennis Ritchie at the Bell Laboratories in 1972. It is a very popular language, despite being old. C is strongly associated with UNIX, as it was developed to write the UNIX operating system.

Is C language easy?

C is a general-purpose language that most programmers learn before moving on to more complex languages. From Unix and Windows to Tic Tac Toe and Photoshop, several of the most commonly used applications today have been built on C. It is easy to learn because: A simple syntax with only 32 keywords.


3 Answers

No the C# compiler will not optimize a lambda expression into inline code. Anonymous delegates and lambda expressions will always produce a corresponding delegate or an expression tree. This is covered in section 6.5 of the C# language spec

An anonymous-method-expression or lambda-expression is classified as an anonymous function (§7.14). The expression does not have a type but can be implicitly converted to a compatible delegate type or expression tree type

In certain cases the lambda will be cached and not recreated for future use. But it will not be inlined.

like image 156
JaredPar Avatar answered Sep 28 '22 07:09

JaredPar


In most cases, no, it isn't.

However, unless you're noticing actual performance issues and have tracked them down in a profiler, you shouldn't worry about it.

like image 24
SLaks Avatar answered Sep 28 '22 08:09

SLaks


The C# compiler will never optimize them. However the .NET JIT compiler might if they're simple enough.

like image 35
Blindy Avatar answered Sep 28 '22 08:09

Blindy