KNOTW/KNOTB/KNOTQ/KNOTD - NOT Mask Register

Opcode/ Instruction

Op/En

64/32 bit Mode Support

CPUID Feature Flag

Description

VEX.L0.0F.W0 44 /r KNOTW k1, k2

RR

V/V

AVX512F

Bitwise NOT of 16 bits mask k2.

VEX.L0.66.0F.W0 44 /r KNOTB k1, k2

RR

V/V

AVX512DQ

Bitwise NOT of 8 bits mask k2.

VEX.L0.0F.W1 44 /r KNOTQ k1, k2

RR

V/V

AVX512BW

Bitwise NOT of 64 bits mask k2.

VEX.L0.66.0F.W1 44 /r KNOTD k1, k2

RR

V/V

AVX512BW

Bitwise NOT of 32 bits mask k2.

Instruction Operand Encoding

Op/En

Operand 1

Operand 2

RR

ModRM:reg (w)

ModRM:r/m (r, ModRM:[7:6] must be 11b)

Description

Performs a bitwise NOT of vector mask k2 and writes the result into vector mask k1.

Operation

KNOTW 

DEST[15:0] := BITWISE NOT SRC[15:0]
DEST[MAX_KL-1:16] := 0

KNOTB 

DEST[7:0] := BITWISE NOT SRC[7:0]
DEST[MAX_KL-1:8] := 0

KNOTQ 

DEST[63:0] := BITWISE NOT SRC[63:0]
DEST[MAX_KL-1:64] := 0

KNOTD 

DEST[31:0] := BITWISE NOT SRC[31:0]
DEST[MAX_KL-1:32] := 0

Intel C/C++ Compiler Intrinsic Equivalent 

KNOTW __mmask16 _mm512_knot(__mmask16 a);

Flags Affected

None.

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Table 2-63, "TYPE K20 Exception Definition (VEX-Encoded OpMask Instructions w/o Memory Arg)."