Performance of tables slower than built in?

[Alex]

On Friday, 24 May 2019 at 08:13:00 UTC, Basilez B. wrote:
> On Thursday, 23 May 2019 at 10:16:42 UTC, Alex wrote:
>> On Wednesday, 22 May 2019 at 08:25:58 UTC, Basile B. wrote:
>>> On Wednesday, 22 May 2019 at 00:22:09 UTC, JS wrote:
>>>> I am trying to create some fast sin, sinc, and exponential 
>>>> routines to speed up some code by using tables... but it 
>>>> seems it's slower than the function itself?!?
>>>>
>>>> [...]
>>>
>>> Hi, lookup tables ARE faster but the problem you have here, 
>>> and I'm surprised that nobody noticed it so far, is that YOUR 
>>> SWITCH LEADS TO A RUNTIME STRING COMPARISON AT RUNTIME. Just 
>>> replace it with a static if (Method = "Linear") { /*...*/} 
>>> else { /*...*/}
>>>
>>> Also takes care to the type used. With DMD the implicit 
>>> coercion of float and double can lead to extra conversions.
>>>
>>> You'll directly see a 15% gain after refactoring the switch.
>>
>> Surely not?!?! Surely the compiler can optimize that switch 
>> since the value passed is CT? I thought the whole point of not 
>> having static switch(analogous to static if) was because it 
>> would go ahead and optimize these cases for us... and it's 
>> just a switch, just a jmp table.
>
> Try by yourself but to be clear note that I don't like your 
> attitude, which I find disrespectful.

Are you an idiot or on medications? My attitude? What did you 
want me to do? Suck your cock? My attitude? Seriously? WHERE? 
WHERE? You quoted everything?

I don't like your attitude? You seem to be extremely 
oversensitive and take things out of context?

It sounds like you just don't like people questioning you in any 
way shape or form even if you are wrong.

"Surely not?!?! Surely the compiler can optimize that switch
since the value passed is CT? I thought the whole point of not
having static switch(analogous to static if) was because it
would go ahead and optimize these cases for us... and it's
just a switch, just a jmp table."

Where? I seriously do not like your attitude though! You attack 
me when I said nothing offensive to you. You have serious 
problems. Get back on or get off the lithium.

[Now, of course, you get to see what an attitude really looks 
like... maybe I've taught you a bit about perspective? I doubt 
it.]