x86doc › KADDW/KADDB/KADDQ/KADDD - ADD Two Masks

KADDW/KADDB/KADDQ/KADDD—ADD Two Masks

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
VEX.L1.0F.W0 4A /r KADDW k1, k2, k3	RVR	V/V	AVX512DQ	Add 16 bits masks in k2 and k3 and place result in k1.
VEX.L1.66.0F.W0 4A /r KADDB k1, k2, k3	RVR	V/V	AVX512DQ	Add 8 bits masks in k2 and k3 and place result in k1.
VEX.L1.0F.W1 4A /r KADDQ k1, k2, k3	RVR	V/V	AVX512BW	Add 64 bits masks in k2 and k3 and place result in k1.
VEX.L1.66.0F.W1 4A /r KADDD k1, k2, k3	RVR	V/V	AVX512BW	Add 32 bits masks in k2 and k3 and place result in k1.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3
RVR	ModRM:reg (w)	VEX.1vvv (r)	ModRM:r/m (r, ModRM:[7:6] must be 11b)

Description

Adds the vector mask k2 and the vector mask k3, and writes the result into vector mask k1.

Operation

KADDW

DEST[15:0] := SRC1[15:0] + SRC2[15:0]
DEST[MAX_KL-1:16] := 0

KADDB

DEST[7:0] := SRC1[7:0] + SRC2[7:0]
DEST[MAX_KL-1:8] := 0

KADDQ

DEST[63:0] := SRC1[63:0] + SRC2[63:0]
DEST[MAX_KL-1:64] := 0

KADDD

DEST[31:0] := SRC1[31:0] + SRC2[31:0]
DEST[MAX_KL-1:32] := 0

Intel C/C++ Compiler Intrinsic Equivalent

KADDW __mmask16 _kadd_mask16 (__mmask16 a, __mmask16 b);

KADDB __mmask8 _kadd_mask8 (__mmask8 a, __mmask8 b);

KADDQ __mmask64 _kadd_mask64 (__mmask64 a, __mmask64 b);

KADDD __mmask32 _kadd_mask32 (__mmask32 a, __mmask32 b);

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).”