# VPBLENDD — Blend Packed Dwords

Opcode/Instruction | Op/En | 64/32 -bit Mode | CPUID Feature Flag | Description
--- | --- | --- | --- | ---
VEX.128.66.0F3A.W0 02 /r ib VPBLENDD xmm1, xmm2, xmm3/m128, imm8 | RVMI | V/V | AVX2 | Select dwords from xmm2 and xmm3/m128 from mask specified in imm8 and store the values into xmm1.
VEX.256.66.0F3A.W0 02 /r ib VPBLENDD ymm1, ymm2, ymm3/m256, imm8 | RVMI | V/V | AVX2 | Select dwords from ymm2 and ymm3/m256 from mask specified in imm8 and store the values into ymm1.

## Instruction Operand Encoding ¶

Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4
--- | --- | --- | --- | ---
RVMI | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | imm8

## Description ¶

Dword elements from the source operand (second operand) are conditionally written to the destination operand (first operand) depending on bits in the immediate operand (third operand). The immediate bits (bits 7:0) form a mask that determines whether the corresponding dword in the destination is copied from the source. If a bit in the mask, corresponding to a dword, is “1", then the dword is copied, else the dword is unchanged.

VEX.128 encoded version: The second source operand can be an XMM register or a 128-bit memory location. The first source and destination operands are XMM registers. Bits (MAXVL-1:128) of the corresponding YMM register are zeroed.

VEX.256 encoded version: The first source operand is a YMM register. The second source operand is a YMM register or a 256-bit memory location. The destination operand is a YMM register.

## Operation ¶

### VPBLENDD (VEX.256 encoded version) ¶

    IF (imm8[0] == 1) THEN DEST[31:0] := SRC2[31:0]
    ELSE DEST[31:0] := SRC1[31:0]
    IF (imm8[1] == 1) THEN DEST[63:32] := SRC2[63:32]
    ELSE DEST[63:32] := SRC1[63:32]
    IF (imm8[2] == 1) THEN DEST[95:64] := SRC2[95:64]
    ELSE DEST[95:64] := SRC1[95:64]
    IF (imm8[3] == 1) THEN DEST[127:96] := SRC2[127:96]
    ELSE DEST[127:96] := SRC1[127:96]
    IF (imm8[4] == 1) THEN DEST[159:128] := SRC2[159:128]
    ELSE DEST[159:128] := SRC1[159:128]
    IF (imm8[5] == 1) THEN DEST[191:160] := SRC2[191:160]
    ELSE DEST[191:160] := SRC1[191:160]
    IF (imm8[6] == 1) THEN DEST[223:192] := SRC2[223:192]
    ELSE DEST[223:192] := SRC1[223:192]
    IF (imm8[7] == 1) THEN DEST[255:224] := SRC2[255:224]
    ELSE DEST[255:224] := SRC1[255:224]

### VPBLENDD (VEX.128 encoded version) ¶

    IF (imm8[0] == 1) THEN DEST[31:0] := SRC2[31:0]
    ELSE DEST[31:0] := SRC1[31:0]
    IF (imm8[1] == 1) THEN DEST[63:32] := SRC2[63:32]
    ELSE DEST[63:32] := SRC1[63:32]
    IF (imm8[2] == 1) THEN DEST[95:64] := SRC2[95:64]
    ELSE DEST[95:64] := SRC1[95:64]
    IF (imm8[3] == 1) THEN DEST[127:96] := SRC2[127:96]
    ELSE DEST[127:96] := SRC1[127:96]
    DEST[MAXVL-1:128] := 0

## Intel C/C++ Compiler Intrinsic Equivalent ¶

    VPBLENDD: __m128i _mm_blend_epi32 (__m128i v1, __m128i v2, const int mask)

    VPBLENDD: __m256i _mm256_blend_epi32 (__m256i v1, __m256i v2, const int mask)

## SIMD Floating-Point Exceptions ¶

None.

## Other Exceptions ¶

See Table 2-21, “Type 4 Class Exception Conditions.”

Additionally:

#UD | If VEX.W = 1.