Re: [PATCH v2 1/4] efd: fix AVX2 support

[Thomas Monjalon <thomas@monjalon.net>]

18/09/2025 11:08, Thomas Monjalon:
> When switching to Meson build, the compilation check on CC_SUPPORT_AVX2
> became obsolete, thus the case EFD_LOOKUP_AVX2 became dead.
> The function efd_lookup_internal_avx2() was never called,
> and its header include rte_efd_x86.h has been removed later.
> 
> AVX2 is assumed to be always supported on x86 with supported compilers,
> so the check for AVX2 is simply removed, and the include is added back.
[...]
> -#if defined(RTE_ARCH_X86) && defined(CC_SUPPORT_AVX2)
> +#if defined(RTE_ARCH_X86)
>  	case EFD_LOOKUP_AVX2:
>  		return efd_lookup_internal_avx2(group->hash_idx,
>  					group->lookup_table,

I've forgotten to say that there is a runtime check:

    if (RTE_EFD_VALUE_NUM_BITS > 3
            && rte_cpu_get_flag_enabled(RTE_CPUFLAG_AVX2)
            && rte_vect_get_max_simd_bitwidth() >= RTE_VECT_SIMD_256)
        table->lookup_fn = EFD_LOOKUP_AVX2;