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

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@linux.microsoft.com>
---
 app/test/test_thash.c | 37 +++++++++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)
  

On Wed, Nov 27, 2024 at 02:57:58PM -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@linux.microsoft.com>
> ---
>  app/test/test_thash.c | 37 +++++++++++++++++++++++++++++++++++++
>  1 file changed, 37 insertions(+)
> 
> diff --git a/app/test/test_thash.c b/app/test/test_thash.c
> index b9c6e9118e..c121b1f43f 100644
> --- a/app/test/test_thash.c
> +++ b/app/test/test_thash.c
> @@ -1030,6 +1030,38 @@ 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
> +	 */
> +	static const uint8_t b_bytes[] = {
> +			0x03, 0x02, 0x01, 0x00, 0x07, 0x06, 0x05, 0x04,
> +			0x0B, 0x0A, 0x09, 0x08, 0x0F, 0x0E, 0x0D, 0x0C};
> +	const __m128i b =
> +			_mm_loadu_si128((const __m128i *)&b_bytes);
> +
> +	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
> +
>  static struct unit_test_suite thash_tests = {
>  	.suite_name = "thash autotest",
>  	.setup = NULL,
> @@ -1052,6 +1084,11 @@ static struct unit_test_suite thash_tests = {
>  	TEST_CASE(test_adjust_tuple),
>  	TEST_CASE(test_adjust_tuple_mult_reta),
>  	TEST_CASE(test_keygen),
> +#ifdef RTE_ARCH_X86
> +#ifndef RTE_TOOLCHAIN_MSVC
> +	TEST_CASE(test_init_m128i),
> +#endif
> +#endif
>  	TEST_CASES_END()
>  	}
>  };
> -- 
> 2.34.1

Could someone please review this patch and let me know if there are changes to be made?
I have other patches depending on this.

Thanks,
Andre Muezerie