MOVLPS

Move Low Packed Single-Precision Floating-Point Values

Opcodes

Hex Mnemonic Encoding Long Mode Legacy Mode Description
0F 13 /r MOVLPS m64, xmm B Valid Valid Move two packed singleprecision floating-point values from low quadword of xmm to m64.
0F 12 /r MOVLPS xmm, m64 A Valid Valid Move two packed singleprecision floating-point values from m64 to low quadword of xmm.

Instruction Operand Encoding

Op/En Operand 0 Operand 1 Operand 2 Operand 3
A NA NA ModRM:r/m (r) ModRM:reg (r, w)
B NA NA ModRM:reg (r) ModRM:r/m (w)

Description

Moves two packed single-precision floating-point values from the source operand (second operand) and the destination operand (first operand). The source and destination operands can be an XMM register or a 64-bit memory location. This instruction allows two single-precision floating-point values to be moved to and from the low quadword of an XMM register and memory. It cannot be used for register to register or memory to memory moves. When the destination operand is an XMM register, the high quadword of the register remains unchanged.

In 64-bit mode, use of the REX.R prefix permits this instruction to access additional registers (XMM8-XMM15).

Pseudo Code

(* MOVLPD instruction for memory to XMM move *)
DEST[63:0] = SRC;
(* DEST[127:64] unchanged *)
(* MOVLPD instruction for XMM to memory move *)
DEST = SRC[63:0];

Exceptions

SIMD Floating-Point Exceptions

None.

64-Bit Mode Exceptions

Exception Description
#AC(0) If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.
#UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:EDX.SSE[bit 25] = 0. If the LOCK prefix is used.
#NM If CR0.TS[bit 3] = 1.
#PF(fault-code) For a page fault.
#GP(0) If the memory address is in a non-canonical form.
#SS(0) If a memory address referencing the SS segment is in a non-canonical form.

Compatibility Mode Exceptions

Same exceptions as in protected mode.

Virtual-8086 Mode Exceptions

Exception Description
#AC(0) If alignment checking is enabled and an unaligned memory reference is made.
#PF(fault-code) For a page fault.
Same exceptions as in real address mode.

Real-Address Mode Exceptions

Exception Description
#UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:EDX.SSE[bit 25] = 0. If the LOCK prefix is used.
#NM If CR0.TS[bit 3] = 1.
#GP If any part of the operand lies outside the effective address space from 0 to FFFFH.

Protected Mode Exceptions

Exception Description
#AC(0) If alignment checking is enabled and an unaligned memory reference is made while the current privilege level is 3.
#UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:EDX.SSE[bit 25] = 0. If the LOCK prefix is used.
#NM If CR0.TS[bit 3] = 1.
#PF(fault-code) For a page fault.
#SS(0) For an illegal address in the SS segment.
#GP(0) For an illegal memory operand effective address in the CS, DS, ES, FS or GS segments.