VPBROADCASTM — Broadcast Mask to Vector Register

Opcode/Instruction	Op/En	64/32 bit Mode Support	CPUID Feature Flag	Description
EVEX.128.F3.0F38.W1 2A /r VPBROADCASTMB2Q xmm1, k1	RM	V/V	AVX512VL AVX512CD	Broadcast low byte value in k1 to two locations in xmm1.
EVEX.256.F3.0F38.W1 2A /r VPBROADCASTMB2Q ymm1, k1	RM	V/V	AVX512VL AVX512CD	Broadcast low byte value in k1 to four locations in ymm1.
EVEX.512.F3.0F38.W1 2A /r VPBROADCASTMB2Q zmm1, k1	RM	V/V	AVX512CD	Broadcast low byte value in k1 to eight locations in zmm1.
EVEX.128.F3.0F38.W0 3A /r VPBROADCASTMW2D xmm1, k1	RM	V/V	AVX512VL AVX512CD	Broadcast low word value in k1 to four locations in xmm1.
EVEX.256.F3.0F38.W0 3A /r VPBROADCASTMW2D ymm1, k1	RM	V/V	AVX512VL AVX512CD	Broadcast low word value in k1 to eight locations in ymm1.
EVEX.512.F3.0F38.W0 3A /r VPBROADCASTMW2D zmm1, k1	RM	V/V	AVX512CD	Broadcast low word value in k1 to sixteen locations in zmm1.

Instruction Operand Encoding ¶

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RM	ModRM:reg (w)	ModRM:r/m (r)	NA	NA

Description ¶

Broadcasts the zero-extended 64/32 bit value of the low byte/word of the source operand (the second operand) to each 64/32 bit element of the destination operand (the first operand). The source operand is an opmask register. The destination operand is a ZMM register (EVEX.512), YMM register (EVEX.256), or XMM register (EVEX.128).

EVEX.vvvv is reserved and must be 1111b otherwise instructions will #UD.

Operation ¶

VPBROADCASTMB2Q ¶

(KL, VL) = (2, 128), (4, 256), (8, 512)
FOR j←0 TO KL-1
    i←j*64
    DEST[i+63:i] ← ZeroExtend(SRC[7:0])
ENDFOR
DEST[MAXVL-1:VL] ← 0

VPBROADCASTMW2D ¶

(KL, VL) = (4, 128), (8, 256),(16, 512)
FOR j←0 TO KL-1
    i←j*32
    DEST[i+31:i] ← ZeroExtend(SRC[15:0])
ENDFOR
DEST[MAXVL-1:VL] ← 0

Intel C/C++ Compiler Intrinsic Equivalent ¶

VPBROADCASTMB2Q __m512i _mm512_broadcastmb_epi64( __mmask8);

VPBROADCASTMW2D __m512i _mm512_broadcastmw_epi32( __mmask16);

VPBROADCASTMB2Q __m256i _mm256_broadcastmb_epi64( __mmask8);

VPBROADCASTMW2D __m256i _mm256_broadcastmw_epi32( __mmask8);

VPBROADCASTMB2Q __m128i _mm_broadcastmb_epi64( __mmask8);

VPBROADCASTMW2D __m128i _mm_broadcastmw_epi32( __mmask8);

SIMD Floating-Point Exceptions ¶

None

Other Exceptions ¶

EVEX-encoded instruction, see Exceptions Type E6NF.