CTFE Status

[Stefan Koch via Digitalmars-d]

On Sunday, 11 December 2016 at 08:33:49 UTC, Stefan Koch wrote:
> On Monday, 31 October 2016 at 13:29:01 UTC, Stefan Koch wrote:
>> Hi Guys, since I got a few complaints about giving minor 
>> status updates in the announce group, I am opening this thread.
>>
>> I will start with giving an overview of what works and what 
>> does not work.
>>
>> Currently the only basic type you can do arithmetic on is int.
>> Altough you can compare longs since a few days.
>>
>> These are the constructs that will work.
>>
>> - foreach on static arrays strings and range-foreach  (those 
>> kinds (0 .. 64)).
>> - switches (even deeply nested ones)
>> - for and while loops
>> - ternary expressions (? :)
>> - if and else statements (as long as you don't use && and || )
>> - lables and gotos
>> - arithmetic expressions as well as post and pre increment and 
>> decrement
>>
>> Constructs that will not work (but are actively worked on)
>>
>> - assignment to static array cells
>> - long ulong arithmetic.
>> - function calls
>> - dynamic arrays and slices
>> - pointers
>> - structs
>> - && and ||
>> - sliceing
>>
>> Constructs that will not work and are futher down the list.
>>
>> - classes
>> - closures
>> - boundschecks
>> - asserts
>>
>> Please note that there will probably be bugs all over the 
>> place.
>> So even the working features might not be working completely.
>
> Remember those numbers ?
> [root at localhost dmd]# time src/dmd -c testSettingArrayLength.d  
> -bc-ctfe
> 2147385345u
> 536821761u
> 4294639619u
>
> real	0m0.114s
> user	0m0.110s
> sys	0m0.003s
>
> This is how they look like after my performance fixes:
>
> real	0m0.047s
> user	0m0.043s
> sys	0m0.000s

Disregard That!
I wasn't paying attention
The lower numbers are produced by ldc!
The performance fixes did lower the overall overhead even more 
though.
Which means bytecode generation will not even show up among the 
top 50 functions in dmd,