MOVQ—Move Quadword

Opcode/Instruction Op/ En 64/32-bit Mode CPUID Feature Flag Description

NP 0F 6F /r

MOVQ mm, mm/m64

A V/V MMX Move quadword from mm/m64 to mm.

NP 0F 7F /r

MOVQ mm/m64, mm

B V/V MMX Move quadword from mm to mm/m64.

F3 0F 7E /r

MOVQ xmm1, xmm2/m64

A V/V SSE2 Move quadword from xmm2/mem64 to xmm1.

VEX.128.F3.0F.WIG 7E /r

VMOVQ xmm1, xmm2/m64

A V/V AVX Move quadword from xmm2 to xmm1.
EVEX.128.F3.0F.W1 7E /r VMOVQ xmm1, xmm2/m64 C V/V AVX512F Move quadword from xmm2/m64 to xmm1.

66 0F D6 /r

MOVQ xmm2/m64, xmm1

B V/V SSE2 Move quadword from xmm1 to xmm2/mem64.

VEX.128.66.0F.WIG D6 /r

VMOVQ xmm1/m64, xmm2

B V/V AVX Move quadword from xmm2 register to xmm1/m64.
EVEX.128.66.0F.W1 D6 /r VMOVQ xmm1/m64, xmm2 D V/V AVX512F Move quadword from xmm2 register to xmm1/m64.

Instruction Operand Encoding

Op/En Tuple Type Operand 1 Operand 2 Operand 3 Operand 4
A NA ModRM:reg (w) ModRM:r/m (r) NA NA
B NA ModRM:r/m (w) ModRM:reg (r) NA NA
C Tuple1 Scalar ModRM:reg (w) ModRM:r/m (r) NA NA
D Tuple1 Scalar ModRM:r/m (w) ModRM:reg (r) NA NA

Description

Copies a quadword from the source operand (second operand) to the destination operand (first operand). The source and destination operands can be MMX technology registers, XMM registers, or 64-bit memory locations. This instruction can be used to move a quadword between two MMX technology registers or between an MMX tech-nology register and a 64-bit memory location, or to move data between two XMM registers or between an XMM register and a 64-bit memory location. The instruction cannot be used to transfer data between memory locations.

When the source operand is an XMM register, the low quadword is moved; when the destination operand is an XMM register, the quadword is stored to the low quadword of the register, and the high quadword is cleared to all 0s.

In 64-bit mode and if not encoded using VEX/EVEX, use of the REX prefix in the form of REX.R permits this instruc-tion to access additional registers (XMM8-XMM15).

Note: VEX.vvvv and EVEX.vvvv are reserved and must be 1111b, otherwise instructions will #UD.

If VMOVQ is encoded with VEX.L= 1, an attempt to execute the instruction encoded with VEX.L= 1 will cause an #UD exception.

Operation

MOVQ instruction when operating on MMX technology registers and memory locations

    DEST := SRC;

MOVQ instruction when source and destination operands are XMM registers

    DEST[63:0] := SRC[63:0];
    DEST[127:64] := 0000000000000000H;

MOVQ instruction when source operand is XMM register and destination

operand is memory location:
    DEST := SRC[63:0];

MOVQ instruction when source operand is memory location and destination

operand is XMM register:
    DEST[63:0] := SRC;
    DEST[127:64] := 0000000000000000H;

VMOVQ (VEX.128.F3.0F 7E) with XMM register source and destination

DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] := 0

VMOVQ (VEX.128.66.0F D6) with XMM register source and destination

DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] := 0

VMOVQ (7E - EVEX encoded version) with XMM register source and destination

DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] := 0

VMOVQ (D6 - EVEX encoded version) with XMM register source and destination

DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] := 0

VMOVQ (7E) with memory source

DEST[63:0] := SRC[63:0]
DEST[MAXVL-1:64] := 0

VMOVQ (7E - EVEX encoded version) with memory source

DEST[63:0] := SRC[63:0]
DEST[:MAXVL-1:64] := 0

VMOVQ (D6) with memory dest

DEST[63:0] := SRC2[63:0]

Flags Affected

None.

Intel C/C++ Compiler Intrinsic Equivalent

VMOVQ __m128i _mm_loadu_si64( void * s);

VMOVQ void _mm_storeu_si64( void * d, __m128i s);

MOVQ m128i _mm_move_epi64(__m128i a)

SIMD Floating-Point Exceptions

None

Other Exceptions

See Table 21-8, “Exception Conditions for Legacy SIMD/MMX Instructions without FP Exception” in the Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 3B.