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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 (cid:197) 0 TO KL-1
    i (cid:197) j*64
    DEST[i+63:i] (cid:197) ZeroExtend(SRC[7:0])
ENDFOR
DEST[MAX_VL-1:VL] (cid:197) 0


VPBROADCASTMW2D

(KL, VL) = (4, 128), (8, 256),(16, 512)
FOR j (cid:197) 0 TO KL-1
    i (cid:197) j*32
    DEST[i+31:i] (cid:197) ZeroExtend(SRC[15:0])
ENDFOR
DEST[MAX_VL-1:VL] (cid:197) 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.