x86 Instruction Set Reference

MOVAPD

Move Aligned Packed Double-Precision Floating-Point Values

Opcode	Mnemonic	Description
`66 0F 28 /r`	`MOVAPD xmm1, xmm2/m128`	Move packed double-precision floating-point values from xmm2/m128 to xmm1.
`66 0F 29 /r`	`MOVAPD xmm2/m128, xmm1`	Move packed double-precision floating-point values from xmm1 to xmm2/m128.

Description
Moves a double quadword containing two packed double-precision floating-point values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load an XMM register from a 128-bit memory location, to store the contents of an XMM register into a 128-bit memory location, or to move data between two XMM registers. When the source or destination operand is a memory operand, the operand must be aligned on a 16-byte boundary or a general-protection exception (#GP) will be generated. To move double-precision floating-point values to and from unaligned memory locations, use the MOVUPD instruction.

Description

Moves a double quadword containing two packed double-precision floating-point values from the source operand (second operand) to the destination operand (first operand). This instruction can be used to load an XMM register from a 128-bit memory location, to store the contents of an XMM register into a 128-bit memory location, or to move data between two XMM registers.

When the source or destination operand is a memory operand, the operand must be aligned on a 16-byte boundary or a general-protection exception (#GP) will be generated.

To move double-precision floating-point values to and from unaligned memory locations, use the MOVUPD instruction.

Operation
Destination = Source; //#GP if Source or Destination unaligned memory operand

SIMD Floating-Point Exceptions
None.

Protected Mode Exceptions

`#GP(0)`	For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments. If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
`#GP(0)`	For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments. If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
`#SS(0)`	For an illegal address in the SS segment.
`#PF(fault-code)`	For a page fault.
`#NM`	If TS in CR0 is set.

Real-Address Mode Exceptions

`#GP(0)`	If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside the effective address space from 0 to FFFFH.
`#GP(0)`	If a memory operand is not aligned on a 16-byte boundary, regardless of segment. If any part of the operand lies outside the effective address space from 0 to FFFFH.
`#NM`	If TS in CR0 is set.

Virtual-8086 Mode Exceptions

Same exceptions as in Real Address Mode

#PF(fault-code) For a page fault.

Instruction	Latency	Throughput	Execution Unit
`CPUID`	0F3n/0F2n	0F3n/0F2n	0F2n
`MOVAPD xmm, xmm`	6/6	1/1	FP_MOVE