Hi,
I'm trying to port some of my c++ code which uses sse2 instructions into D. The code calls the following intrinsics:

- _mm256_loadu_si256
- _mm256_movemask_epi8

Do they have any equivalent intrinsics in D?

I'm compiling my c++ code using gcc.

Thanks,
Piotr

On Saturday, 29 July 2017 at 16:01:07 UTC, piotrekg2 wrote:
> Hi,
> I'm trying to port some of my c++ code which uses sse2 instructions into D. The code calls the following intrinsics:
>
> - _mm256_loadu_si256
> - _mm256_movemask_epi8
>
> Do they have any equivalent intrinsics in D?
>
> I'm compiling my c++ code using gcc.
>
> Thanks,
> Piotr

https://stackoverflow.com/questions/14002946/explicit-simd-code-in-d

I don't think something has changed since then.

On Saturday, 29 July 2017 at 16:01:07 UTC, piotrekg2 wrote:
> Hi,
> I'm trying to port some of my c++ code which uses sse2 instructions into D. The code calls the following intrinsics:
>
> - _mm256_loadu_si256
> - _mm256_movemask_epi8
>
> Do they have any equivalent intrinsics in D?

Yes, with LDC (probably GDC too).
But unfortunately we don't have the "_mm256" functions (yet?), instead we have GCC's "__builtin_ia32..." functions.

The first one you mention I think is just an unaligned load? That can be done with the template `loadUnaligned` from module ldc.simd.

The second one has a synonym, "__builtin_ia32_pmovmskb256".

-Johan

On Saturday, 29 July 2017 at 18:19:47 UTC, Johan Engelen wrote:
> On Saturday, 29 July 2017 at 16:01:07 UTC, piotrekg2 wrote:
>> Hi,
>> I'm trying to port some of my c++ code which uses sse2 instructions into D. The code calls the following intrinsics:
>>
>> - _mm256_loadu_si256
>> - _mm256_movemask_epi8
>>
>> Do they have any equivalent intrinsics in D?
>
> Yes, with LDC (probably GDC too).
> But unfortunately we don't have the "_mm256" functions (yet?), instead we have GCC's "__builtin_ia32..." functions.
>
> The first one you mention I think is just an unaligned load? That can be done with the template `loadUnaligned` from module ldc.simd.
>
> The second one has a synonym, "__builtin_ia32_pmovmskb256".
>
> -Johan

What about __builtin_ctz?

On Saturday, 29 July 2017 at 22:45:12 UTC, piotrekg2 wrote:
> On Saturday, 29 July 2017 at 18:19:47 UTC, Johan Engelen wrote:
>> On Saturday, 29 July 2017 at 16:01:07 UTC, piotrekg2 wrote:
>>> Hi,
>>> I'm trying to port some of my c++ code which uses sse2 instructions into D. The code calls the following intrinsics:
>>>
>>> - _mm256_loadu_si256
>>> - _mm256_movemask_epi8
>>>
>>> Do they have any equivalent intrinsics in D?
>>
>> Yes, with LDC (probably GDC too).
>> But unfortunately we don't have the "_mm256" functions (yet?), instead we have GCC's "__builtin_ia32..." functions.
>>
>> The first one you mention I think is just an unaligned load? That can be done with the template `loadUnaligned` from module ldc.simd.
>>
>> The second one has a synonym, "__builtin_ia32_pmovmskb256".
>>
>> -Johan
>
> What about __builtin_ctz?

https://github.com/ldc-developers/druntime/blob/ldc/src/ldc/intrinsics.di#L325

On Sunday, 30 July 2017 at 02:05:32 UTC, Nicholas Wilson wrote:
> On Saturday, 29 July 2017 at 22:45:12 UTC, piotrekg2 wrote:
>> What about __builtin_ctz?
>
> https://github.com/ldc-developers/druntime/blob/ldc/src/ldc/intrinsics.di#L325

you can also make it out of bsf or bsr (i can't remember which) from `core.bitop`