MOVHPD
Move High Packed Double Precision Floating
| 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 | D | V/V | AVX512F | 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 | E | V/V | AVX512F | Move double precision floating-point value from high quadword of xmm1 to m64. |
Instruction Operand Encoding
| 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 |
Description
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.
Operation
MOVHPD (128-bit Legacy SSE Load)
DEST[63:0] (Unmodified)
DEST[127:64] := SRC[63:0]
DEST[MAXVL-1:128] (Unmodified)
VMOVHPD (VEX.128 & EVEX Encoded Load)
DEST[63:0] := SRC1[63:0]
DEST[127:64] := SRC2[63:0]
DEST[MAXVL-1:128] := 0
VMOVHPD (Store)
DEST[63:0] := SRC[127:64]
Intel C/C++ Compiler Intrinsic Equivalent
MOVHPD __m128d _mm_loadh_pd ( __m128d a, double *p)
MOVHPD void _mm_storeh_pd (double *p, __m128d a)
SIMD Floating-Point Exceptions
None.
Other Exceptions
Non-EVEX-encoded instruction, see Table 2-22, “Type 5 Class Exception Conditions,” additionally:
| #UD | If VEX.L = 1. |
|---|
EVEX-encoded instruction, see Table 2-57, “Type E9NF Class Exception Conditions.”
This UNOFFICIAL, mechanically-separated, non-verified reference is provided for convenience, but it may be incomplete or broken in various obvious or non-obvious ways. Refer to Intel® 64 and IA-32 Architectures Software Developer’s Manual for anything serious.