x86
Instruction Set Architecture

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Galois Field New Instructions (GFNI) is an x86 extension.

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Overview

GF2P8AFFINEQB

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GF2P8AFFINEINVQB

...

GF2P8MULB

...

Detection

The GFNI feature flag indicates support for the SSE variant of these instructions operating on 128-bit vectors. 128- and 256-bit AVX versions are supported if the AVX flag is set as well.

The AVX-512 variants with EVEX encoding operating on 512-bit vectors are supported if the GFNI and AVX512F (Foundation) flags are set. The 128- and 256-bit versions with EVEX encoding are supported if the AVX512VL (Vector Length) flag is set as well.

CPUID		Instruction Set
Input	Output
EAX=01H	ECX[bit 28]	AVX
EAX=07H, ECX=0	EBX[bit 16]	AVX512F
EAX=07H, ECX=0	EBX[bit 31]	AVX512VL
EAX=07H, ECX=0	ECX[bit 08]	GFNI

Microarchitecture support

Designer	Microarchitecture	Year	Support Level
			GFNI SSE	GFNI AVX	GFNI AVX-512 (128/256)	GFNI AVX-512 (512)
AMD	Zen 4	2022	✔	✔	✔	✔

Intrinsic functions

// GF2P8AFFINEQB
__m128i _mm_gf2p8affine_epi64_epi8(__m128i, __m128i, int);
__m128i _mm_mask_gf2p8affine_epi64_epi8(__m128i, __mmask16, __m128i, __m128i, int);
__m128i _mm_maskz_gf2p8affine_epi64_epi8(__mmask16, __m128i, __m128i, int);
__m256i _mm256_gf2p8affine_epi64_epi8(__m256i, __m256i, int);
__m256i _mm256_mask_gf2p8affine_epi64_epi8(__m256i, __mmask32, __m256i, __m256i, int);
__m256i _mm256_maskz_gf2p8affine_epi64_epi8(__mmask32, __m256i, __m256i, int);
__m512i _mm512_gf2p8affine_epi64_epi8(__m512i, __m512i, int);
__m512i _mm512_mask_gf2p8affine_epi64_epi8(__m512i, __mmask64, __m512i, __m512i, int);
__m512i _mm512_maskz_gf2p8affine_epi64_epi8(__mmask64, __m512i, __m512i, int);
// GF2P8AFFINEINVQB
__m128i _mm_gf2p8affineinv_epi64_epi8(__m128i, __m128i, int);
__m128i _mm_mask_gf2p8affineinv_epi64_epi8(__m128i, __mmask16, __m128i, __m128i, int);
__m128i _mm_maskz_gf2p8affineinv_epi64_epi8(__mmask16, __m128i, __m128i, int);
__m256i _mm256_gf2p8affineinv_epi64_epi8(__m256i, __m256i, int);
__m256i _mm256_mask_gf2p8affineinv_epi64_epi8(__m256i, __mmask32, __m256i, __m256i, int);
__m256i _mm256_maskz_gf2p8affineinv_epi64_epi8(__mmask32, __m256i, __m256i, int);
__m512i _mm512_gf2p8affineinv_epi64_epi8(__m512i, __m512i, int);
__m512i _mm512_mask_gf2p8affineinv_epi64_epi8(__m512i, __mmask64, __m512i, __m512i, int);
__m512i _mm512_maskz_gf2p8affineinv_epi64_epi8(__mmask64, __m512i, __m512i, int);
// VGF2P8MULB
__m128i _mm_gf2p8mul_epi8(__m128i, __m128i);
__m128i _mm_mask_gf2p8mul_epi8(__m128i, __mmask16, __m128i, __m128i);
__m128i _mm_maskz_gf2p8mul_epi8(__mmask16, __m128i, __m128i);
__m256i _mm256_gf2p8mul_epi8(__m256i, __m256i);
__m256i _mm256_mask_gf2p8mul_epi8(__m256i, __mmask32, __m256i, __m256i);
__m256i _mm256_maskz_gf2p8mul_epi8(__mmask32, __m256i, __m256i);
__m512i _mm512_gf2p8mul_epi8(__m512i, __m512i);
__m512i _mm512_mask_gf2p8mul_epi8(__m512i, __mmask64, __m512i, __m512i);
__m512i _mm512_maskz_gf2p8mul_epi8(__mmask64, __m512i, __m512i);