Proposal for SentinelInputRange

[Steven Schveighoffer]

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.

> Then try the lookahead cases I also posted.

You have already stated it gets changed into a jump table.  Such an  
optimization seems possible to me, even with the != 0 check outside the  
switch, even if not all C compilers employ it.

-Steve