C/C++ extension for SIMD proposal

C/C++ extension for SIMD proposal

[Jakub Juszczakiewicz]

Hi all,

     I don't know is here right place for sharing ideas, but I don't 
have idea, where I can send it.
I have simple idea. When I turned on OpenMP, for parallelly execute 
simple for it's enough when I add line like this before loop:

#pragma omp parallel for
for (size_t i = 0; i < 1000000; i++)
    vec_c[i] = vec_a[i] * vec_b[i];

Why don't use similar idea for show compiler that, it can by done by 
SIMD CPU extension? e.g.

#pragma simd for

Maybe I'm wrong and there is better way for do it, and I don't know how. 
If I'm right, maybe it could be idea for extend C/C++ in this way.

Best regards,
Jakub

Re: C/C++ extension for SIMD proposal

[Jakub Jelinek]

On Sat, Jun 10, 2023 at 07:51:10PM +0200, Jakub Juszczakiewicz via Gcc wrote:
> Hi all,
> 
>     I don't know is here right place for sharing ideas, but I don't have
> idea, where I can send it.
> I have simple idea. When I turned on OpenMP, for parallelly execute simple
> for it's enough when I add line like this before loop:
> 
> #pragma omp parallel for
> for (size_t i = 0; i < 1000000; i++)
>    vec_c[i] = vec_a[i] * vec_b[i];
> 
> Why don't use similar idea for show compiler that, it can by done by SIMD
> CPU extension? e.g.
> 
> #pragma simd for

Use
#pragma omp simd
for that.
That is part of OpenMP for years.

	Jakub

Re: C/C++ extension for SIMD proposal

[Jakub Juszczakiewicz]

Hi.

     Thanks for fast reply. I will check this, because I didn't know that.
BR,
Jakub

On 10.06.2023 20:12, Jakub Jelinek wrote:
> On Sat, Jun 10, 2023 at 07:51:10PM +0200, Jakub Juszczakiewicz via Gcc wrote:
>> Hi all,
>>
>>      I don't know is here right place for sharing ideas, but I don't have
>> idea, where I can send it.
>> I have simple idea. When I turned on OpenMP, for parallelly execute simple
>> for it's enough when I add line like this before loop:
>>
>> #pragma omp parallel for
>> for (size_t i = 0; i < 1000000; i++)
>>     vec_c[i] = vec_a[i] * vec_b[i];
>>
>> Why don't use similar idea for show compiler that, it can by done by SIMD
>> CPU extension? e.g.
>>
>> #pragma simd for
> Use
> #pragma omp simd
> for that.
> That is part of OpenMP for years.
>
> 	Jakub
>