Comments on: On CIL and coding

By: Chris

Chris — Wed, 28 Nov 2007 19:07:24 +0000

@RichB: When coding anonymous delegates, yes I can. I have coded iterators (I assume you are talking about yield return) but not enough to know the CIL generated there. As for lambdas, I haven’t used that feature at all.

By: Foxfire

Foxfire — Wed, 28 Nov 2007 15:30:06 +0000

@Gabriel

The general idea in CLI is that the individual language compilers shouldn’t optimize much because the JIT-Compiler does the optimizations.

By: RichB

RichB — Wed, 28 Nov 2007 09:28:13 +0000

Even when you’re coding anonymous methods/lambdas and iterators? That would be an impressive skill.

By: Chris

Chris — Wed, 28 Nov 2007 04:37:53 +0000

@edison: Not to my knowledge.

@Gabriel: Yes, you would think, but mcs does not.

By: Gabriel

Gabriel — Wed, 28 Nov 2007 00:44:52 +0000

@Chris:

I’m surprised the compiler doesn’t take care of that, at least for comparisons with constants.

By: edison

edison — Tue, 27 Nov 2007 23:42:12 +0000

Is someone in Mono Team working in a obfuscater?

By: Chris

Chris — Tue, 27 Nov 2007 20:56:22 +0000

@Bill:

I do prefer > over >= (ditto for < ) because of the IL sequences.

(a > b): a; b; cgt;

(a >= b): a; b; clt; ldc.i4.0; ceq;

For floating-point expressions there isn’t much of a choice, but for integers (a > 0) will produce more efficient IL than (a >= 1).

By: Bill Barry

Bill Barry — Tue, 27 Nov 2007 20:38:35 +0000

It only becomes bad when you begin avoiding certain constructs because they produce CIL opcodes that you don’t “like”. For instance preferring an infinite while loop with a break instead of a for loop.

By: AndersH

AndersH — Tue, 27 Nov 2007 20:36:28 +0000

Nah, but if you start seeing jit’ed code, especially heavily optimized jit’ed code, you might want to take a small break.

It’s bad if you actually think your c# code is easier to read, if you indent it according to what the stack depth will be at that point of the execution.

By: Jay

Jay — Tue, 27 Nov 2007 20:08:09 +0000

It’s not bad. Maybe a bit unusual, but not bad.

I would enjoy seeing a small app written directly in IL. Might make a good intro-to-IL article.

Can you send me your email address?