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MOVHPD
MOVHPD — Move High Packed Double Precision Floating-Point Value
| Opcode/ Instruction | Op / En | 64/32 bit Mode Support | CPUID Feature Flag | Description |
| 66 0F 16 /r MOVHPD xmm1, m64 | A | V/V | SSE2 | Move double precision floating-point value from m64 to high quadword of xmm1. |
| VEX.128.66.0F.WIG 16 /r VMOVHPD xmm2, xmm1, m64 | B | V/V | AVX | Merge double precision floating-point value from m64 and the low quadword of xmm1. |
| EVEX.128.66.0F.W1 16 /r VMOVHPD xmm2, xmm1, m64 | DV/V | AVX512F OR AVX10.1 | Merge double precision floating-point value from m64 and the low quadword of xmm1. | |
| 66 0F 17 /r MOVHPD m64, xmm1 | C | V/V | SSE2 | Move double precision floating-point value from high quadword of xmm1 to m64. |
| VEX.128.66.0F.WIG 17 /r VMOVHPD m64, xmm1 | C | V/V | AVX | Move double precision floating-point value from high quadword of xmm1 to m64. |
| EVEX.128.66.0F.W1 17 /r VMOVHPD m64, xmm1 | EV/V | AVX512F OR AVX10.1 | Move double precision floating-point value from high quadword of xmm1 to m64. |
| Op/En | Tuple Type | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
| A | N/A | ModRM:reg (r, w) | ModRM:r/m (r) | N/A | N/A |
| B | N/A | ModRM:reg (w) | VEX.vvvv (r) | ModRM:r/m (r) | N/A |
| C | N/A | ModRM:r/m (w) | ModRM:reg (r) | N/A | N/A |
| D | Tuple1 Scalar | ModRM:reg (w) | EVEX.vvvv (r) | ModRM:r/m (r) | N/A |
| E | Tuple1 Scalar | ModRM:r/m (w) | ModRM:reg (r) | N/A | N/A |
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 64-bits of the destination XMM register. The lower 64bits of the XMM register are preserved. Bits (MAXVL-1:128) of the corresponding destination register are preserved.
VEX.128 & EVEX encoded load:
Loads a double precision floating-point value from the source 64-bit memory operand (the third operand) and stores it in the upper 64-bits of the destination XMM register (first operand). The low 64-bits from the first source operand (second operand) are copied to the low 64-bits of the destination. Bits (MAXVL-1:128) of the corresponding destination 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.vvvv and EVEX.vvvv are reserved and must be 1111b otherwise instruction will #UD.
If VMOVHPD is encoded with VEX.L or EVEX.L’L= 1, an attempt to execute the instruction encoded with VEX.L or EVEX.L’L= 1 will cause an #UD exception.
DEST[63:0] (Unmodified)
DEST[127:64] ← SRC[63:0]DEST[63:0] ← SRC1[63:0]
DEST[127:64] ← SRC2[63:0]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.
Non-EVEX-encoded instruction, see Table 2-22, “Type 5 Class Exception Conditions,” additionally:
#UD If VEX.L = 1.
Source: Intel® 64 and IA-32 Architectures Software Developer's Manual, Combined Volumes (Order Number 325462-091US, March 2026)
Generated: 7-6-2026