| Opcode/Instruction | Op/En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
|---|---|---|---|---|
| 66 0F 38 29 /r PCMPEQQ xmm1, xmm2/m128 | RM | V/V | SSE4_1 | Compare packed qwords in xmm2/m128 and xmm1 for equality. |
| VEX.NDS.128.66.0F38.WIG 29 /r VPCMPEQQ xmm1, xmm2, xmm3/m128 | RVM | V/V | AVX | Compare packed quadwords in xmm3/m128 and xmm2 for equality. |
| VEX.NDS.256.66.0F38.WIG 29 /r VPCMPEQQ ymm1, ymm2, ymm3 /m256 | RVM | V/V | AVX2 | Compare packed quadwords in ymm3/m256 and ymm2 for equality. |
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| RM | ModRM:reg (r, w) | ModRM:r/m (r) | NA | NA |
| RVM | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | NA |
Performs an SIMD compare for equality of the packed quadwords in the destination operand (first operand) and the source operand (second operand). If a pair of data elements is equal, the corresponding data element in the desti-nation is set to all 1s; otherwise, it is set to 0s.
128-bit Legacy SSE version: The second source operand can be an XMM register or a 128-bit memory location. The first source and destination operands are XMM registers. Bits (VLMAX-1:128) of the corresponding YMM destination register remain unchanged.
VEX.128 encoded version: The second source operand can be an XMM register or a 128-bit memory location. The first source and destination operands are XMM registers. Bits (VLMAX-1:128) of the corresponding YMM register are zeroed.
VEX.256 encoded version: The first source operand is a YMM register. The second source operand is a YMM register or a 256-bit memory location. The destination operand is a YMM register.
Note: VEX.L must be 0, otherwise the instruction will #UD.
IF (DEST[63:0] = SRC[63:0])
THEN DEST[63:0] ← FFFFFFFFFFFFFFFFH;
ELSE DEST[63:0] ← 0; FI;
IF (DEST[127:64] = SRC[127:64])
THEN DEST[127:64] ← FFFFFFFFFFFFFFFFH;
ELSE DEST[127:64] ← 0; FI;
VPCMPEQQ (VEX.128 encoded version)
DEST[127:0] ←COMPARE_QWORDS_EQUAL(SRC1,SRC2) DEST[VLMAX-1:128] ← 0
VPCMPEQQ (VEX.256 encoded version)
DEST[127:0] ←COMPARE_QWORDS_EQUAL(SRC1[127:0],SRC2[127:0]) DEST[255:128] ←COMPARE_QWORDS_EQUAL(SRC1[255:128],SRC2[255:128])
(V)PCMPEQQ:
__m128i _mm_cmpeq_epi64(__m128i a, __m128i b);
VPCMPEQQ:
__m256i _mm256_cmpeq_epi64( __m256i a, __m256i b);
None.
None.
See Exceptions Type 4; additionally
| #UD | If VEX.L = 1. |