Proposal for SentinelInputRange

[deadalnix]

On Thursday, 28 February 2013 at 22:00:11 UTC, Walter Bright 
wrote:
> On 2/28/2013 9:25 AM, Steven Schveighoffer wrote:
>> On Thu, 28 Feb 2013 12:00:48 -0500, Walter Bright 
>> <newshound2 at digitalmars.com>
>> wrote:
>>
>>> On 2/28/2013 6:31 AM, Steven Schveighoffer wrote:
>>>> If this doesn't translate to the same code, I don't know why 
>>>> not.
>>>
>>> Try it and see with your favorite C compiler.
>>
>> A sample case of 1 does not prove it's not possible, or 
>> explain why those
>> optimizers don't take that step.  A valid response would be to 
>> give a case why
>> an optimizer COULDN'T make that leap.
>
> No, it is not. DMD is compiled with real compilers, not 
> abstract "sufficiently smart compilers".
>

I finally decided to write a post about such imaginary 
"sufficiently smart compilers" that clearly don't exists today, 
never will and so we have to clutter the language : 
http://www.deadalnix.me/2013/03/23/a-story-about-optimization-llvm-and-the-sentinelinputrange/

I really hope that someone wrote this imaginary LLVM thing 
everybody is talking about !