core.traits?

[Jacob Carlborg]

On 2019-01-09 12:49, Mike Franklin wrote:

> In DMD you can't use it without linking in the runtime, but in LDC and 
> GDC, you can.  One of the goals of implementing these runtime hooks as 
> templates is to make more features available in -betterC builds, or for 
> pay-as-you-go runtime implementations. If you need to link in druntime 
> to get `alloca`, you can't implement the runtime hooks as templates and 
> have them work in -betterC.

Ah, I see.
> Yes, it's possible, but I don't think it will ever be accepted if it 
> doesn't perform at least as well as the optimized versions in C or 
> assembly that use AVX512 or other SIMD features.  It needs to be at 
> least as good as what libc provides, so we need to be able to leverage 
> these unique hardware features to get the best performance.

Perhaps it could be considered as a fallback when a "memcpy" isn't 
available.

-- 
/Jacob Carlborg