| Opcode/Instruction | Op/En | 64/32-bit Mode | CPUID Feature Flag | Description |
| 66 0F 12 /r MOVLPD xmm, m64 | RM | V/V | SSE2 | Move double-precision floating-point value from m64 to low quadword of xmm register. |
| 66 0F 13 /r MOVLPD m64, xmm | MR | V/V | SSE2 | Move double-precision floating-point nvalue from low quadword of xmm register to m64. |
| VEX.NDS.128.66.0F.WIG 12 /r VMOVLPD xmm2, xmm1, m64 | RVM | V/V | AVX | Merge double-precision floating-point value from m64 and the high quadword of xmm1. |
| VEX.128.66.0F.WIG 13/r VMOVLPD m64, xmm1 | MR | V/V | AVX | Move double-precision floating-point values from low quadword of xmm1 to m64. |
| Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| RM | ModRM:reg (r, w) | ModRM:r/m (r) | NA | NA |
| MR | ModRM:r/m (w) | ModRM:reg (r) | NA | NA |
| RVM | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | NA |
This instruction cannot be used for register to register or memory to memory moves. 128-bit Legacy SSE load: Moves a double-precision floating-point value from the source 64-bit memory operand and stores it in the low 64bits of the destination XMM register. The upper 64bits of the XMM register are preserved. The upper 128-bits of the corresponding YMM destination register are preserved.
In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15). VEX.128 encoded load: Loads a double-precision floating-point value from the source 64-bit memory operand (third operand), merges it with the upper 64-bits of the first source XMM register (second operand), and stores it in the low 128-bits of the destination XMM register (first operand). The upper 128-bits of the destination YMM register are zeroed. 128-bit store: Stores a double-precision floating-point value from the low 64-bits of the XMM register source (second operand) to the 64-bit memory location (first operand). Note: VMOVLPD (store) (VEX.128.66.0F 13 /r) is legal and has the same behavior as the existing 66 0F 13 store. For VMOVLPD (store) (VEX.128.66.0F 13 /r) instruction version, VEX.vvvv is reserved and must be 1111b otherwise instruction will #UD. If VMOVLPD is encoded with VEX.L= 1, an attempt to execute the instruction encoded with VEX.L= 1 will cause an #UD exception.
MOVLPD (128-bit Legacy SSE load) DEST[63:0] ← SRC[63:0] DEST[VLMAX-1:64] (Unmodified) VMOVLPD (VEX.128 encoded load) DEST[63:0] ← SRC2[63:0] DEST[127:64] ← SRC1[127:64] DEST[VLMAX-1:128] ← 0 VMOVLPD (store) DEST[63:0] ← SRC[63:0]
| MOVLPD: | __m128d _mm_loadl_pd ( __m128d a, double *p) |
| MOVLPD: | void _mm_storel_pd (double *p, __m128d a) |
None.
See Exceptions Type 5; additionally
| #UD | If VEX.L= 1. If VEX.vvvv != 1111B. |