MOVD/MOVQ—Move Doubleword/Move Quadword

Opcode/Instruction	Op/En	64/32-bit Mode	CPUID Feature Flag	Description
0F 6E /r MOVD mm, r/m32	RM	V/V	MMX	Move doubleword from r/m32 to mm.
REX.W + 0F 6E /r MOVQ mm, r/m64	RM	V/N.E.	MMX	Move quadword from r/m64 to mm.
0F 7E /r MOVD r/m32, mm	MR	V/V	MMX	Move doubleword from mm to r/m32.
REX.W + 0F 7E /r MOVQ r/m64, mm	MR	V/N.E.	MMX	Move quadword from mm to r/m64.
VEX.128.66.0F.W0 6E / VMOVD xmm1, r32/m32	RM	V/V	AVX	Move doubleword from r/m32 to xmm1.
VEX.128.66.0F.W1 6E /r VMOVQ xmm1, r64/m64	RM	V/N.E.	AVX	Move quadword from r/m64 to xmm1.
66 0F 6E /r MOVD xmm, r/m32	RM	V/V	SSE2	Move doubleword from r/m32 to xmm.
66 REX.W 0F 6E /r MOVQ xmm, r/m64	RM	V/N.E.	SSE2	Move quadword from r/m64 to xmm.
66 0F 7E /r MOVD r/m32, xmm	MR	V/V	SSE2	Move doubleword from xmm register to r/m32.
66 REX.W 0F 7E /r MOVQ r/m64, xmm	MR	V/N.E.	SSE2	Move quadword from xmm register to r/m64.
VEX.128.66.0F.W0 7E /r VMOVD r32/m32, xmm1	MR	V/V	AVX	Move doubleword from xmm1 register to r/m32.
VEX.128.66.0F.W1 7E /r VMOVQ r64/m64, xmm1	MR	V/N.E.	AVX	Move quadword from xmm1 register to r/m64.

Instruction Operand Encoding

Op/En	Operand 1	Operand 2	Operand 3	Operand 4
RM	ModRM:reg (w)	ModRM:r/m (r)	NA	NA
MR	ModRM:r/m (w)	ModRM:reg (r)	NA	NA

Description

Copies a doubleword from the source operand (second operand) to the destination operand (first operand). The source and destination operands can be general-purpose registers, MMX technology registers, XMM registers, or 32-bit memory locations. This instruction can be used to move a doubleword to and from the low doubleword of an MMX technology register and a general-purpose register or a 32-bit memory location, or to and from the low doubleword of an XMM register and a general-purpose register or a 32-bit memory location. The instruction cannot be used to transfer data between MMX technology registers, between XMM registers, between general-purpose registers, or between memory locations.

When the destination operand is an MMX technology register, the source operand is written to the low doubleword of the register, and the register is zero-extended to 64 bits. When the destination operand is an XMM register, the source operand is written to the low doubleword of the register, and the register is zero-extended to 128 bits.

In 64-bit mode, the instruction’s default operation size is 32 bits. Use of the REX.R prefix permits access to addi-tional registers (R8-R15). Use of the REX.W prefix promotes operation to 64 bits. See the summary chart at the beginning of this section for encoding data and limits.

Operation

MOVD (when destination operand is MMX technology register)

    DEST[31:0] ← SRC;
    DEST[63:32] ← 00000000H;

MOVD (when destination operand is XMM register)

    DEST[31:0] ← SRC;
    DEST[127:32] ← 000000000000000000000000H;
    DEST[VLMAX-1:128] (Unmodified)

MOVD (when source operand is MMX technology or XMM register)

    DEST ← SRC[31:0];

VMOVD (VEX-encoded version when destination is an XMM register)

    DEST[31:0] ← SRC[31:0]
    DEST[VLMAX-1:32] ← 0

MOVQ (when destination operand is XMM register)

    DEST[63:0] ← SRC[63:0];
    DEST[127:64] ← 0000000000000000H;
    DEST[VLMAX-1:128] (Unmodified)

MOVQ (when destination operand is r/m64)

    DEST[63:0] ← SRC[63:0];

MOVQ (when source operand is XMM register or r/m64)

    DEST ← SRC[63:0];

VMOVQ (VEX-encoded version when destination is an XMM register)

    DEST[63:0] ← SRC[63:0]
    DEST[VLMAX-1:64] ← 0

Intel C/C++ Compiler Intrinsic Equivalent

MOVD:

__m64 _mm_cvtsi32_si64 (int i )

MOVD:

int _mm_cvtsi64_si32 ( __m64m )

MOVD:

__m128i _mm_cvtsi32_si128 (int a)

MOVD:

int _mm_cvtsi128_si32 ( __m128i a)

MOVQ:

__int64 _mm_cvtsi128_si64(__m128i);

MOVQ:

__m128i _mm_cvtsi64_si128(__int64);

Flags Affected

None.

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Exceptions Type 5; additionally

#UD	If VEX.L = 1. If VEX.vvvv ≠ 1111B.