# 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) | N/A | N/A

### 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 Table 2-54, “Type E6NF Class Exception Conditions.”