x86 Instruction Set Reference

# MOVDQA

# Move Aligned Double Quadword

Opcode Mnemonic Description
66 0F 6F /r MOVDQA xmm1, xmm2/m128 Move aligned double quadword from xmm2/m128 to xmm1.
66 0F 7F /r MOVDQA xmm2/m128, xmm1 Move aligned double quadword from xmm1 to xmm2/m128.

# Description

Moves a double quadword 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 a double quadword to or from unaligned memory locations, use the MOVDQU instruction.

# Operation

Destination = Source;
//#GP if Source or Destination unaligned memory operand
1
2
3

# SIMD Floating-Point Exceptions

None.

# Protected Mode Exceptions
#PF(fault-code) If a page fault occurs.
#PF(fault-code) If a page fault occurs.
#GP(0) If a memory operand effective address is outside the CS, DS, ES, FS, or GS segment limit. If a memory operand is not aligned on a 16-byte boundary, regardless of segment.
#SS(0) If a memory operand effective address is outside the SS segment limit.
#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 of 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 of 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/069n 0F3n/0F2n/069n 0F2n
MOVDQA xmm, xmm 6/6/1 1/1/1 FP_MOVE

← MOVDQU →