MOVSHDUP

Move Packed Single-FP High and Duplicate

Opcodes

Hex Mnemonic Encoding Long Mode Legacy Mode Description
F3 0F 16 /r MOVSHDUP xmm1, xmm2/m128 A Valid Valid Move two single-precision floating-point values from the higher 32-bit operand of each qword in xmm2/m128 to xmm1 and duplicate each 32-bit operand to the lower 32-bits of each qword.

Instruction Operand Encoding

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

Description

The linear address corresponds to the address of the least-significant byte of the referenced memory data. When a memory address is indicated, the 16 bytes of data at memory location m128 are loaded and the single-precision elements in positions 1 and 3 are duplicated. When the register-register form of this operation is used, the same operation is performed but with data coming from the 128-bit source register.

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

Pseudo Code

IF (Source = m128)
	(* Load instruction *)
	xmm1[31:0] = m128[63:32];
	xmm1[63:32] = m128[63:32];
	xmm1[95:64] = m128[127:96];
	xmm1[127:96] = m128[127:96];
ELSE
	(* Move instruction *)
	xmm1[31:0] = xmm2[63:32];
	xmm1[63:32] = xmm2[63:32];
	xmm1[95:64] = xmm2[127:96];
	xmm1[127:96] = xmm2[127:96];
FI;

Exceptions

Numeric Exceptions

None

Exceptions

General protection exception if not aligned on 16-byte boundary, regardless of segment.

64-Bit Mode Exceptions

Exception Description
#UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.SSE3(ECX, bit 0) is 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. If memory operand is not aligned on a 16-byte boundary, regardless of segment.
#SS(0) If a memory address referencing the SS segment is not non-canonical.

Compatibility Mode Exceptions

Same exceptions as in protected mode.

Virtual-8086 Mode Exceptions

Exception Description
#PF(fault-code) For a page fault.
#UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:ECX.SSE3[bit 0] = 0. If the LOCK prefix is used.
#NM If CR0.TS[bit 3] = 1.
#GP(0) If any part of the operand would lie outside of the effective address space from 0 to 0FFFFH. If memory operand is not aligned on a 16-byte boundary, regardless of segment.

Real-Address Mode Exceptions

Exception Description
#UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:ECX.SSE3[bit 0] = 0. If the LOCK prefix is used.
#NM If CR0.TS[bit 3] = 1.
#GP(0) If any part of the operand would lie outside of the effective address space from 0 to 0FFFFH. If memory operand is not aligned on a 16-byte boundary, regardless of segment.

Protected Mode Exceptions

Exception Description
#UD If CR0.EM[bit 2] = 1. If CR4.OSFXSR[bit 9] = 0. If CPUID.01H:ECX.SSE3[bit 0] = 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. If memory operand is not aligned on a 16-byte boundary, regardless of segment.