!!!Please add intrinsics module for DMD DRuntime!!!

Ilya Yaroshenko via Digitalmars-d digitalmars-d at puremagic.com
Tue Nov 22 08:28:38 PST 2016


On Tuesday, 22 November 2016 at 16:07:39 UTC, Steven 
Schveighoffer wrote:
> On 11/22/16 8:31 AM, Ilya Yaroshenko wrote:
>> Philosophical Questions:
>>
>> 1. Why hight level stuff like BitRange is in core.bitop, but 
>> not in
>> std.bitmanip? If it should be in core, why it is public?
>
> I wrote BitRange to help with cycle detection. It was related 
> to using the btc/btr/bt functions on bit arrays (it's meant to 
> wrap such a bit array), so that seemed like a natural place for 
> it. Putting it in std.bitmanip would make it unavailable to 
> druntime.
>
> Why shouldn't it be public?
>
>>
>> 2. Why bsf and bsr do NOT use hardware instructions anymore?
>
> They should unless there is no hardware instruction available. 
> I believe the software implementation is only a fallback when 
> this is the case.
>
> -Steve

They are always software  
https://github.com/dlang/druntime/blob/master/src/core/bitop.d 
--Ilya


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