| Opcode/Instruction | Op/En | 64/32-bit Mode | CPUID Feature Flag | Description |
| 66 0F 16 /r MOVHPD xmm, m64 | RM | V/V | SSE2 | Move double-precision floating-point value from m64 to high quadword of xmm. |
| 66 0F 17 /r MOVHPD m64, xmm | MR | V/V | SSE2 | Move double-precision floating-point value from high quadword of xmm to m64. |
| VEX.NDS.128.66.0F.WIG 16 /r VMOVHPD xmm2, xmm1, m64 | RVM | V/V | AVX | Merge double-precision floating-point value from m64 and the low quadword of xmm1. |
| VEX128.66.0F.WIG 17/r VMOVHPD m64, xmm1 | MR | V/V | AVX | Move double-precision floating-point values from high 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 high 64bits of the destination XMM register. The lower 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) and stores it in the upper 64-bits of the destination XMM register (first operand). The low 64-bits from second XMM register (second operand) are stored in the lower 64-bits of the destination. The upper 128-bits of the destination YMM register are zeroed. 128-bit store: Stores a double-precision floating-point value from the high 64-bits of the XMM register source (second operand) to the 64-bit memory location (first operand). Note: VMOVHPD (store) (VEX.128.66.0F 17 /r) is legal and has the same behavior as the existing 66 0F 17 store. For VMOVHPD (store) (VEX.128.66.0F 17 /r) instruction version, VEX.vvvv is reserved and must be 1111b otherwise instruction will #UD. If VMOVHPD is encoded with VEX.L= 1, an attempt to execute the instruction encoded with VEX.L= 1 will cause an #UD exception.
MOVHPD (128-bit Legacy SSE load) DEST[63:0] (Unmodified) DEST[127:64] ← SRC[63:0] DEST[VLMAX-1:128] (Unmodified) VMOVHPD (VEX.128 encoded load) DEST[63:0] ← SRC1[63:0] DEST[127:64] ← SRC2[63:0] DEST[VLMAX-1:128] ← 0 VMOVHPD (store) DEST[63:0] ← SRC[127:64]
| MOVHPD: | __m128d _mm_loadh_pd ( __m128d a, double *p) |
| MOVHPD: | void _mm_storeh_pd (double *p, __m128d a) |
None.
See Exceptions Type 5; additionally
| #UD | If VEX.L= 1. |