| Opcode/Instruction | Op/En | 64/32-bit Mode | CPUID Feature Flag | Description |
| F3 0F 6F /r MOVDQU xmm1, xmm2/m128 | RM | V/V | SSE2 | Move unaligned double quadword from xmm2/m128 to xmm1. |
| F3 0F 7F /r MOVDQU xmm2/m128, xmm1 | MR | V/V | SSE2 | Move unaligned double quadword from xmm1 to xmm2/m128. |
| VEX.128.F3.0F.WIG 6F /r VMOVDQU xmm1, xmm2/m128 | RM | V/V | AVX | Move unaligned packed integer values from xmm2/mem to xmm1. |
| VEX.128.F3.0F.WIG 7F /r VMOVDQU xmm2/m128, xmm1 | MR | V/V | AVX | Move unaligned packed integer values from xmm1 to xmm2/mem. |
| VEX.256.F3.0F.WIG 6F /r VMOVDQU ymm1, ymm2/m256 | RM | V/V | AVX | Move unaligned packed integer values from ymm2/mem to ymm1. |
| VEX.256.F3.0F.WIG 7F /r VMOVDQU ymm2/m256, ymm1 | MR | V/V | AVX | Move unaligned packed integer values from ymm1 to ymm2/mem. |
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| RM | ModRM:reg (w) | ModRM:r/m (r) | NA | NA |
| MR | ModRM:r/m (w) | ModRM:reg (r) | NA | NA |
128-bit versions:
Moves 128 bits of packed integer values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load an XMM register from a 128-bit memory location, to store the contents of an XMM register into a 128-bit memory location, or to move data between two XMM registers. When the source or destination operand is a memory operand, the operand may be unaligned on a 16-byte boundary without causing a general-protection exception (#GP) to be generated.1
To move a double quadword to or from memory locations that are known to be aligned on 16-byte boundaries, use the MOVDQA instruction.
While executing in 16-bit addressing mode, a linear address for a 128-bit data access that overlaps the end of a 16bit segment is not allowed and is defined as reserved behavior. A specific processor implementation may or may not generate a general-protection exception (#GP) in this situation, and the address that spans the end of the segment may or may not wrap around to the beginning of the segment.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15). 128-bit Legacy SSE version: Bits (VLMAX-1:128) of the corresponding YMM destination register remain unchanged. When the source or destination operand is a memory operand, the operand may be unaligned to any alignment without causing a general-protection exception (#GP) to be generated VEX.128 encoded version: Bits (VLMAX-1:128) of the destination YMM register are zeroed.
VEX.256 encoded version: Moves 256 bits of packed integer values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load a YMM register from a 256-bit memory
| 1. | If alignment checking is enabled (CR0.AM = 1, RFLAGS.AC = 1, and CPL = 3), an alignment-check exception (#AC) may or may not be generated (depending on processor implementation) when the operand is not aligned on an 8-byte boundary. |
location, to store the contents of a YMM register into a 256-bit memory location, or to move data between two YMM registers. Note: In VEX-encoded versions, VEX.vvvv is reserved and must be 1111b otherwise instructions will #UD.
MOVDQU load and register copy (128-bit Legacy SSE version) DEST[127:0] ← SRC[127:0] DEST[VLMAX-1:128] (Unmodified) (V)MOVDQU 128-bit store-form versions DEST[127:0] ← SRC[127:0] VMOVDQU (VEX.128 encoded version) DEST[127:0] ← SRC[127:0] DEST[VLMAX-1:128] ← 0 VMOVDQU (VEX.256 encoded version) DEST[255:0] ← SRC[255:0]
| MOVDQU: | void _mm_storeu_si128 ( __m128i *p, __m128i a) |
| MOVDQU: | __m128i _mm_loadu_si128 ( __m128i *p) |
| VMOVDQU: | __m256i _mm256_loadu_si256 (__m256i * p); |
| VMOVDQU: | _mm256_storeu_si256(_m256i *p, __m256i a); |
None.
See Exceptions Type 4; additionally
| #UD | If VEX.vvvv != 1111B. |