VINSERTI128 — Insert Packed Integer Values

Opcode/Instruction Op/En 64/32 -bit Mode CPUID Feature Flag Description
VEX.NDS.256.66.0F3A.W0 38 /r ib VINSERTI128 ymm1, ymm2, xmm3/m128, imm8 RVMI V/V AVX2 Insert 128-bits of integer data from xmm3/mem and the remaining values from ymm2 into ymm1.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
RVMI ModRM:reg (w) VEX.vvvv ModRM:r/m (r) Imm8


Performs an insertion of 128-bits of packed integer data from the second source operand (third operand) into an the destination operand (first operand) at a 128-bit offset from imm8[0]. The remaining portions of the destination are written by the corresponding fields of the first source operand (second operand). The second source operand can be either an XMM register or a 128-bit memory location. The high 7 bits of the immediate are ignored. VEX.L must be 1; an attempt to execute this instruction with VEX.L=0 will cause #UD.


TEMP[255:0] ← SRC1[255:0]
CASE (imm8[0]) OF
  0: TEMP[127:0] ←SRC2[127:0]
  1: TEMP[255:128] ← SRC2[127:0]

Intel C/C++ Compiler Intrinsic Equivalent

VINSERTI128: __m256i _mm256_inserti128_si256 (__m256i a, __m128i b, int offset);

SIMD Floating-Point Exceptions


Other Exceptions

See Exceptions Type 6; additionally

#UD If VEX.L = 0, If VEX.W = 1.