[PATCH v2 2/2] app/test: add test_init_m128i using compiler intrinsic

[Bruce Richardson]

On Tue, Mar 04, 2025 at 01:53:19PM -0800, Andre Muezerie wrote:
> This test initializes an __m128i data type using the old
> non-portable way used until now and the more portable way
> using compiler intrinsics. The test ensures the resulting
> values after initialization match.
> 
> Signed-off-by: Andre Muezerie <andremue at linux.microsoft.com>
> ---
>  app/test/test_thash.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/app/test/test_thash.c b/app/test/test_thash.c
> index 33b0c6adac..5f7081a3ad 100644
> --- a/app/test/test_thash.c
> +++ b/app/test/test_thash.c
> @@ -1029,6 +1029,35 @@ test_keygen(void)
>  	return TEST_SUCCESS;
>  }
>  
> +#ifdef RTE_ARCH_X86
> +#ifndef RTE_TOOLCHAIN_MSVC
> +static int
> +test_init_m128i(void)
> +{
> +	/* When initializing __m128i with two constant values like below
> +	 * MSVC issues warning C4305:
> +	 *     'initializing': truncation from 'unsigned __int64' to 'char'
> +	 */
> +	static const __m128i a = {
> +			0x0405060700010203ULL, 0x0C0D0E0F08090A0BULL};
> +
> +	/* Using compiler intrinsics to initialize __m128i is therefore
> +	 * preferred, like below
> +	 */
> +	const __m128i b = _mm_set_epi64x(
> +			0x0C0D0E0F08090A0BULL, 0x0405060700010203ULL);
> +
> +	if (memcmp(&a, &b, sizeof(a)) != 0) {
> +		printf("Same value was expected when initializing data "
> +				"type using compiler intrinsic\n");
> +		return -1;
> +	}
> +
> +	return TEST_SUCCESS;
> +}
> +#endif
> +#endif
> +
Do we still need this patch? I don't think its necessary.