kxorq

XOR Mask Quadword

KXORQ k1, k2, k3

Bitwise XOR of 64-bit masks.

Details

Performs a bitwise XOR of two 64-bit AVX-512 opmask registers and stores the result in the destination opmask. This instruction operates on mask registers (k0–k7) treating them as 64-bit values and does not affect EFLAGS. It is part of the AVX-512BW extension and executes with minimal latency.

Pseudocode Operation

k1 ← k2 ^ k3;

Example

KXORQ k1, k2, k3

Encoding

Binary Layout
EVEX
+0
0F
+4
47
+5
 
Format EVEX
Opcode VEX.L1.0F.W1 47 /r
Extension AVX-512BW

Operands

  • dest
    AVX-512 opmask register (k0-k7)
  • src1
    AVX-512 opmask register (k0-k7)
  • src2
    AVX-512 opmask register (k0-k7)

Reference (Intel® SDM)

Instruction Forms

Opcode Instruction Op/En 64/32-bit Mode CPUID Description
VEX.L1.0F.W0 47 /r KXORW k1, k2, k3 V/V RVR AVX512F OR AVX10.1 Bitwise XOR 16-bit masks k2 and k3 and place result in k1.
VEX.L1.66.0F.W0 47 /r KXORB k1, k2, k3 V/V RVR AVX512DQ OR AVX10.1 Bitwise XOR 8-bit masks k2 and k3 and place result in k1.
VEX.L1.0F.W1 47 /r KXORQ k1, k2, k3 V/V RVR AVX512BW OR AVX10.1 Bitwise XOR 64-bit masks k2 and k3 and place result in k1.
VEX.L1.66.0F.W1 47 /r KXORD k1, k2, k3 V/V RVR AVX512BW OR AVX10.1 Bitwise XOR 32-bit masks k2 and k3 and place result in k1.

Description

Performs a bitwise XOR between the vector mask k2 and the vector mask k3, and writes the result into vector mask k1 (three-operand form).

Operation

KXORW
DEST[15:0] := SRC1[15:0] BITWISE XOR SRC2[15:0]
DEST[MAX_KL-1:16] := 0

KXORB
DEST[7:0] := SRC1[7:0] BITWISE XOR SRC2[7:0]
DEST[MAX_KL-1:8] := 0

KXORQ
DEST[63:0] := SRC1[63:0] BITWISE XOR SRC2[63:0]
DEST[MAX_KL-1:64] := 0

KXORD
DEST[31:0] := SRC1[31:0] BITWISE XOR SRC2[31:0]
DEST[MAX_KL-1:32] := 0

Intel C/C++ Compiler Intrinsic Equivalent

KXORW __mmask16 _mm512_kxor(__mmask16 a, __mmask16 b);

Flags Affected

None.

Exceptions

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Table 2-65, “TYPE K20 Exception Definition (VEX-Encoded OpMask Instructions w/o Memory Arg).” KXORW/KXORB/KXORQ/KXORD—Bitwise Logical XOR Masks Vol. 2A 3-531