On Fri, Jan 17, 2025 at 1:05 PM Paul Eggert <egg...@cs.ucla.edu> wrote:
>
> On 2025-01-17 06:44, Jeffrey Walton wrote:
> > Change:
> >
> > const __m128i *data = buf;
> >
> > To this so the compiler cannot pick between MOVDQA and MOVDQU:
> >
> > const __m128i data = _mm_loadu_si128(buf);
>
> This doesn't look right, as 'data' is used as a pointer later.
You can take the address of data.
You can do a lot of unusual things, like zero half the value:
__m128i data = _mm_loadu_si128(buf);
memset( (uint8_t*) &data, 0, 8 );
And copy a buffer to a variable:
__m128i data;
memcpy( (uint8_t*) &data, buf, 16 );
I don't recommend doing them, but I know it can be done.
Jeff
