x86doc › VPBROADCASTM - Broadcast Mask to Vector Register

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.”