On Fri, Jan 8, 2016 at 1:53 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
> On Fri, Jan 8, 2016 at 1:43 PM, H.J. Lu <hjl.to...@gmail.com> wrote:
>> On Fri, Jan 8, 2016 at 1:38 PM, Jakub Jelinek <ja...@redhat.com> wrote:
>>> On Fri, Jan 08, 2016 at 01:27:08PM -0800, H.J. Lu wrote:
>>>> > That is just wrong and will severely pessimize correct code.
>>>> > Please don't waste time on that.
>>>> >
>>>>
>>>> Do you have an example to show it will pessimize correct code?
>>>
>>> Anything where the compiler can't figure out alignment info and you use the
>>> aligned functions, starting from trivial tests like:
>>>
>>> void foo (float *p, __m256 q)
>>> {
>>> _mm256_store_ps (p, q);
>>> }
>>>
>>
>
> Is a bad example:
>
This is a better example:
__m256
foo (const void *p, __m256 yy, __mmask8 m)
{
return _mm256_mask_load_ps (yy, m, p);
}
--
H.J.
