Re: Can you write code directly in CIL ???
- From: "Peter Olcott" <olcott@xxxxxxx>
- Date: Mon, 26 Dec 2005 21:13:19 -0600
I want to be able to stick with purely managed code, if possible. I just need
this 100 line function to run as fast as if it was hand tweaked assembly
language. I have examined CIL, for the most part it is essentially assembly
language. From what I understand any optimizations take place before the CIL is
generated. When I designed this system (in 1998) I had hand tweaked assembly
language in mind for this crucial function all along.
"Nicholas Paldino [.NET/C# MVP]" <mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:%23RjK3$oCGHA.2040@xxxxxxxxxxxxxxxxxxxxxxx
> Peter,
>
> Not at all. When the CLR gets a hold of the JIT, it is free to perform any
> optimizations it deems necessary, and that might not necessarily be in line
> with what you are expecting.
>
> My recommendation would be to use Managed C++ to create a wrapper to your
> unmanaged code which uses It Just Works (IJW, seriously). You should get a
> managed interface, and the best possible performance (for this specific
> situation, not all situations) between managed an unmanaged code.
>
>
> --
> - Nicholas Paldino [.NET/C# MVP]
> - mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> "Peter Olcott" <olcott@xxxxxxx> wrote in message
> news:_51sf.37898$QW2.37853@xxxxxxxxxxxxx
>>I need the best possible execution speed. I have found that there is a large
>>difference in the quality of the code generated by the various compilers. I
>>have 16,000 hours of development time in my current project. There is a 100
>>line function that must take no longer than 1/10 second to execute. I can just
>>barely achieve this with MSVC++ 6.0. MSVC++ 7.0 has had some of its
>>optimizations disabled. I eventually will need to port this to C# .NET. This
>>is a case where hand tweaked assembly language would be appropriate. I figured
>>that hand tweaked CIL would be the .NET equivalent of hand tweaked assembly
>>language.
>>
>> "Nicholas Paldino [.NET/C# MVP]" <mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote in
>> message news:OCvd7unCGHA.2644@xxxxxxxxxxxxxxxxxxxxxxx
>>> Peter,
>>>
>>> You can write it, but you would have to create a module with IL, and then
>>> compile that into your assembly (or just write the whole assembly).
>>>
>>> Also, what optimizations do you think you can make? Ultimately, you
>>> suffer from the fact that Windows is not a real-time OS, and nothing you can
>>> do will change that. On top of that, the JIT is what's going to optimize
>>> your code again after you try to, so you might actually end up hurting
>>> yourself more than helping yourself.
>>>
>>> If you post the code you are trying to optimize, we can try and tell you
>>> where you might make some improvements, but dipping down to the IL level is
>>> most likely not going to help you much.
>>>
>>>
>>> --
>>> - Nicholas Paldino [.NET/C# MVP]
>>> - mvp@xxxxxxxxxxxxxxxxxxxxxxxxxxx
>>>
>>>
>>> "Peter Olcott" <olcott@xxxxxxx> wrote in message
>>> news:7t%rf.37887$QW2.9998@xxxxxxxxxxxxx
>>>> Cab you write code directly in the Common Intermediate language? I need to
>>>> optimize a critical real-time function.
>>>>
>>>
>>>
>>
>>
>
>
.
- Follow-Ups:
- Re: Can you write code directly in CIL ???
- From: Nicholas Paldino [.NET/C# MVP]
- Re: Can you write code directly in CIL ???
- References:
- Can you write code directly in CIL ???
- From: Peter Olcott
- Re: Can you write code directly in CIL ???
- From: Nicholas Paldino [.NET/C# MVP]
- Re: Can you write code directly in CIL ???
- From: Peter Olcott
- Re: Can you write code directly in CIL ???
- From: Nicholas Paldino [.NET/C# MVP]
- Can you write code directly in CIL ???
- Prev by Date: Re: Does strong naming require deployment in GAC?
- Next by Date: Re: Does strong naming require deployment in GAC?
- Previous by thread: Re: Can you write code directly in CIL ???
- Next by thread: Re: Can you write code directly in CIL ???
- Index(es):
Relevant Pages
|
