Re: [PATCH v2 2/2] net: stop using mmx intrinsics

[Bruce Richardson <bruce.richardson@intel.com>]

On Thu, Mar 28, 2024 at 09:14:06AM -0700, Tyler Retzlaff wrote:
> Update code to use only avx/sse intrinsics as mmx is not supported on
> MSVC.
> 
> Signed-off-by: Tyler Retzlaff <roretzla@linux.microsoft.com>
> ---

One comment inline below. With or without that suggestion:

Acked-by: Bruce Richardson <bruce.richardson@intel.com>

>  lib/net/net_crc_avx512.c | 27 +++++++--------------------
>  lib/net/net_crc_sse.c    | 27 +++++++--------------------
>  2 files changed, 14 insertions(+), 40 deletions(-)
> 
> diff --git a/lib/net/net_crc_avx512.c b/lib/net/net_crc_avx512.c
> index 0f0dee4..d18eb96 100644
> --- a/lib/net/net_crc_avx512.c
> +++ b/lib/net/net_crc_avx512.c
> @@ -5,11 +5,10 @@
>  #include <stdalign.h>
>  
>  #include <rte_common.h>
> +#include <rte_vect.h>
>  
>  #include "net_crc.h"
>  
> -#include <x86intrin.h>
> -
>  /* VPCLMULQDQ CRC computation context structure */
>  struct crc_vpclmulqdq_ctx {
>  	__m512i rk1_rk2;
> @@ -331,13 +330,10 @@ static const alignas(16) uint32_t mask2[4] = {
>  			c9, c10, c11);
>  	crc32_eth.fold_3x128b = _mm512_setr_epi64(c12, c13, c14, c15,
>  			c16, c17, 0, 0);

Since the setr's below are being replaced, it would be nice to change these
ones above too. Long term I think it's going to be confusing having some
assignments set up as L->R, while others are R->L.


> -	crc32_eth.fold_1x128b = _mm_setr_epi64(_mm_cvtsi64_m64(c16),
> -			_mm_cvtsi64_m64(c17));
> +	crc32_eth.fold_1x128b = _mm_set_epi64x(c17, c16);
>  
> -	crc32_eth.rk5_rk6 = _mm_setr_epi64(_mm_cvtsi64_m64(c18),
> -			_mm_cvtsi64_m64(c19));
> -	crc32_eth.rk7_rk8 = _mm_setr_epi64(_mm_cvtsi64_m64(c20),
> -			_mm_cvtsi64_m64(c21));
> +	crc32_eth.rk5_rk6 = _mm_set_epi64x(c19, c18);
> +	crc32_eth.rk7_rk8 = _mm_set_epi64x(c21, c20);
>  }

<snip>