[ping PATCH v2 1/2] rs6000: Add support for _mm_minpos_epu16

Paul A. Clarke pc@us.ibm.com
Mon Jun 21 14:27:56 GMT 2021


Gentle ping.

I now realize I forgot to include a blurb about "what changed in v2".

v2:
- Slight formatting changes based on Segher's review (simplified
  condition, single line).

PC

On Tue, Jun 08, 2021 at 02:11:54PM -0500, Paul A. Clarke via Gcc-patches wrote:
> Add a naive implementation of the subject x86 intrinsic to
> ease porting.
> 
> 2021-06-08  Paul A. Clarke  <pc@us.ibm.com>
> 
> gcc/ChangeLog:
>         * config/rs6000/smmintrin.h (_mm_minpos_epu16): New.
> ---
>  gcc/config/rs6000/smmintrin.h | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
> 
> diff --git a/gcc/config/rs6000/smmintrin.h b/gcc/config/rs6000/smmintrin.h
> index bdf6eb365d88..b7de38763f2b 100644
> --- a/gcc/config/rs6000/smmintrin.h
> +++ b/gcc/config/rs6000/smmintrin.h
> @@ -116,4 +116,29 @@ _mm_blendv_epi8 (__m128i __A, __m128i __B, __m128i __mask)
>    return (__m128i) vec_sel ((__v16qu) __A, (__v16qu) __B, __lmask);
>  }
>  
> +/* Return horizontal packed word minimum and its index in bits [15:0]
> +   and bits [18:16] respectively.  */
> +extern __inline __m128i __attribute__((__gnu_inline__, __always_inline__, __artificial__))
> +_mm_minpos_epu16 (__m128i __A)
> +{
> +  union __u
> +    {
> +      __m128i __m;
> +      __v8hu __uh;
> +    };
> +  union __u __u = { .__m = __A }, __r = { .__m = {0} };
> +  unsigned short __ridx = 0;
> +  unsigned short __rmin = __u.__uh[__ridx];
> +  for (unsigned long __i = __ridx + 1; __i < 8; __i++)
> +    {
> +      if (__u.__uh[__i] < __rmin)
> +        {
> +          __rmin = __u.__uh[__i];
> +          __ridx = __i;
> +        }
> +    }
> +  __r.__uh[0] = __rmin;
> +  __r.__uh[1] = __ridx;
> +  return __r.__m;
> +}
>  #endif
> -- 
> 2.27.0
> 


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