MOVMSKPD (Extract Packed Double-Precision Floating-Point Sign Mask)

Opcodes

Opcode/Instruction Op/En 64/32-bit Mode CPUID Feature Flag Description
66 0F 50 /r MOVMSKPD reg, xmm RM V/V SSE2 Extract 2-bit sign mask from xmm and store in reg. The upper bits of r32 or r64 are filled with zeros.
VEX.128.66.0F.WIG 50 /r VMOVMSKPD reg, xmm2 RM V/V AVX Extract 2-bit sign mask from xmm2 and store in reg. The upper bits of r32 or r64 are zeroed.
VEX.256.66.0F.WIG 50 /r VMOVMSKPD reg, ymm2 RM V/V AVX Extract 4-bit sign mask from ymm2 and store in reg. The upper bits of r32 or r64 are zeroed.

Instruction Operand Encoding

Op/En Operand 1 Operand 2 Operand 3 Operand 4
RM ModRM:reg (w) ModRM:r/m (r) NA NA

Description

Extracts the sign bits from the packed double-precision floating-point values in the source operand (second operand), formats them into a 2-bit mask, and stores the mask in the destination operand (first operand). The source operand is an XMM register, and the destination operand is a general-purpose register. The mask is stored in the 2 low-order bits of the destination operand. Zero-extend the upper bits of the destination.

In 64-bit mode, the instruction can access additional registers (XMM8-XMM15, R8-R15) when used with a REX.R prefix. The default operand size is 64-bit in 64-bit mode.

128-bit versions: The source operand is a YMM register. The destination operand is a general purpose register.

VEX.256 encoded version: The source operand is a YMM register. The destination operand is a general purpose register.

Note: In VEX-encoded versions, VEX.vvvv is reserved and must be 1111b, otherwise instructions will #UD.

Operation

(V)MOVMSKPD (128-bit versions)

DEST[0] ← SRC[63]
DEST[1] ← SRC[127]
IF DEST = r32
    THEN DEST[31:2] ← 0;
    ELSE DEST[63:2] ← 0;
FI

VMOVMSKPD (VEX.256 encoded version)

DEST[0] ← SRC[63]
DEST[1] ← SRC[127]
DEST[2] ← SRC[191]
DEST[3] ← SRC[255]
IF DEST = r32
    THEN DEST[31:4] ← 0;
    ELSE DEST[63:4] ← 0;
FI

Intel C/C++ Compiler Intrinsic Equivalent

MOVMSKPD:

int _mm_movemask_pd ( __m128d a)

SIMD Floating-Point Exceptions

None.

Other Exceptions

See Exceptions Type 7; additionally

#UD If VEX.vvvv ≠ 1111B.