Just playing with compiler explorer to see assembly line count.

[Daniel Kozak]

is not bad

https://godbolt.org/g/bSfubs

On Tue, Oct 3, 2017 at 3:19 PM, SrMordred via Digitalmars-d <
digitalmars-d at puremagic.com> wrote:

> //D compiled with gdc 5.2 -O3
>
> auto test(int[] arr, int cmp)
> {
>     int[] r;
>     foreach(v ; arr)
>         if(v == cmp)r~=v;
>     return r;
> }
> // 51 lines of assembly
>
> auto test(int[] arr, int cmp)
> {
>   return arr.filter!((v)=>v==cmp).array;
> }
> //1450 lines... what?
>
> Ok let me look also at c++:
> //gcc 7.2 -O3
>
> vector<int> test(vector<int>& arr, int cmp) {
>     vector<int> r;
>     for(auto v : arr)
>         if(v == cmp)r.push_back(v);
>     return r;
> }
> //152 lines. more than D :)
>
> vector<int> test(vector<int>& arr, int cmp) {
>     vector<int> r;
>     std::copy_if (arr.begin(), arr.end(), std::back_inserter(r),
>      [cmp](int i){return i==cmp;} );
>     return r;
> }
>
> //150 lines. That what i expected earlier with D.
>
> Hmm. let me be 'fair' and use std.container.array just for curiosity:
>
> auto test(ref Array!int arr, int cmp)
> {
>     Array!int r;
>     foreach(v ; arr)
>         if(v == cmp)r.insert(v);
>     return r;
> }
>
> //5542 lines... what??
>
> Someone interested to discuss about this?
>
> Or point me some grotesque mistake.
>
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