Naive node.js faster than naive LDC2?

[Andrei Alexandrescu]

On 8/22/20 3:34 PM, Avrina wrote:
> On Saturday, 22 August 2020 at 19:20:34 UTC, Andrei Alexandrescu wrote:
>> On 8/22/20 1:40 PM, kinke wrote:
>>> On Saturday, 22 August 2020 at 16:15:14 UTC, H. S. Teoh wrote:
>>>> 3) std.math.fmax calling the C library (involving a PIC indirection 
>>>> to a
>>>> shared library as opposed to inlineable native D code).
>>>
>>> Yes, and that's because there's only a `real` version for fmax.
>>>
>>> If upstream Phobos had proper double/float overloads, we could 
>>> uncomment the LDC-specific implementations using LLVM intrinsics, 
>>> which use (obviously much faster) SSE instructions:
>>>
>>> https://github.com/ldc-developers/phobos/blob/1366c7d5be65def916f030785fc1f1833342497d/std/math.d#L7785-L7798 
>>>
>>>
>>>
>>> Number crunching in D could be significantly accelerated if the 
>>> people interested in it showed some love for std.math, but we've had 
>>> this topic for years.
>>
>> Ow, do we still suffer from that? Sigh.
>>
>> https://github.com/dlang/phobos/pull/7604/files
>>
>> It's 10 minutes of work - as much as writing a couple of posts, and 
>> much more satisfactory.
> 
> Cos, sin, tan, asin, acos, atan, etc.. There's still more, putting in 
> the actual work that std.math needs is going to take more than 10 mins.

1. Linear time for small n is fine and does not affect the argument.

2. Incremental is still fine.

3. Work has actually be done by Nick Wilson in 
https://github.com/dlang/phobos/pull/7463.