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 <p...@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
>
