VMOVW - Move Word

Opcode/ Instruction

Op/ En

64/32 bit Mode Support

CPUID Feature Flag

Description

EVEX.128.66.MAP5.WIG 6E /r

VMOVW xmm1, reg/m16

A

V/V

AVX512-FP16

Copy word from reg/m16 to xmm1.

EVEX.128.66.MAP5.WIG 7E /r

VMOVW reg/m16, xmm1

B

V/V

AVX512-FP16

Copy word from xmm1 to reg/m16.

Instruction Operand Encoding

Op/En

Tuple

Operand 1

Operand 2

Operand 3

Operand 4

A

Scalar

ModRM:reg (w)

ModRM:r/m (r)

N/A

N/A

B

Scalar

ModRM:r/m (w)

ModRM:reg (r)

N/A

N/A

Description

This instruction either (a) copies one word element from an XMM register to a general-purpose register or memory location or (b) copies one word element from a general-purpose register or memory location to an XMM register. When writing a general-purpose register, the lower 16-bits of the register will contain the word value. The upper bits of the general-purpose register are written with zeros.

Operation

VMOVW dest, src (two operand load) 

DEST.word[0] := SRC.word[0]
DEST[MAXVL:16] := 0

VMOVW dest, src (two operand store) 

DEST.word[0] := SRC.word[0]
// upper bits of GPR DEST are zeroed

Intel C/C++ Compiler Intrinsic Equivalent 

VMOVW short _mm_cvtsi128_si16 (__m128i a);
VMOVW __m128i _mm_cvtsi16_si128 (short a);

SIMD Floating-Point Exceptions

None

Other Exceptions

EVEX-encoded instructions, see Table 2-57, "Type E9NF Class Exception Conditions."