PCMPEQB - Packed CoMPare EQual Byte

PCMPEQB xmm1, xmm2/m128    (S2
__m128i _mm_cmpeq_epi8(__m128i a, __m128i b)

For each BYTE, if (1) == (2) set 1, else set 0, to all bits in the corresponding BYTE of (3).
VPCMPEQB xmm1, xmm2, xmm3/m128    (V1
__m128i _mm_cmpeq_epi8(__m128i a, __m128i b)

For each BYTE, if (1) == (2) set 1, else set 0, to all bits in the corresponding BYTE of (3).
VPCMPEQB ymm1, ymm2, ymm3/m256    (V2
__m256i _mm256_cmpeq_epi8(__m256i a, __m256i b)

For each BYTE, if (1) == (2) set 1, else set 0, to all bits in the corresponding BYTE of (3).
VPCMPEQB k1{k2}, xmm2, xmm3/m128    (V5+BW+VL
__mmask16 _mm_cmpeq_epi8_mask(__m128i a, __m128i b)
__mmask16 _mm_mask_cmpeq_epi8_mask(__mmask16 k2, __m128i a, __m128i b)

For each BYTE, if (1) == (2) set 1, else set 0, to the corresponding bit of (3).
If k2 bit is 0, the comparison is not done and the corresponding bit of (3) is set to zero. Upper bits of (3) are zero cleared.
VPCMPEQB k1{k2}, ymm2, ymm3/m256    (V5+BW+VL
__mmask32 _mm256_cmpeq_epi8_mask(__m256i a, __m256i b)
__mmask32 _mm256_mask_cmpeq_epi8_mask(__mmask32 k2, __m256i a, __m256i b)

For each BYTE, if (1) == (2) set 1, else set 0, to the corresponding bit of (3).
If k2 bit is 0, the comparison is not done and the corresponding bit of (3) is set to zero. Upper bits of (3) are zero cleared.
VPCMPEQB k1{k2}, zmm2, zmm3/m512    (V5+BW
__mmask64 _mm512_cmpeq_epi8_mask(__m512i a, __m512i b)
__mmask64 _mm512_mask_cmpeq_epi8_mask(__mmask64 k2, __m512i a, __m512i b)

For each BYTE, if (1) == (2) set 1, else set 0, to the corresponding bit of (3).
If k2 bit is 0, the comparison is not done and the corresponding bit of (3) is set to zero. Upper bits of (3) are zero cleared.
x86/x64 SIMD Instruction List  Feedback