MOVMSKPS — Extract Packed Single-Precision Floating-Point Sign Mask

Opcode/Instruction	Op/En	64/32-bit Mode	CPUID Feature Flag	Description
NP 0F 50 /r MOVMSKPS reg, xmm	RM	V/V	SSE	Extract 4-bit sign mask from xmm and store in reg. The upper bits of r32 or r64 are filled with zeros.
VEX.128.0F.WIG 50 /r VMOVMSKPS reg, xmm2	RM	V/V	AVX	Extract 4-bit sign mask from xmm2 and store in reg. The upper bits of r32 or r64 are zeroed.
VEX.256.0F.WIG 50 /r VMOVMSKPS reg, ymm2	RM	V/V	AVX	Extract 8-bit sign mask from ymm2 and store in reg. The upper bits of r32 or r64 are zeroed.

Instruction Operand Encoding¹ ¶

1. ModRM.MOD = 011B required

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 single-precision floating-point values in the source operand (second operand), formats them into a 4- or 8-bit mask, and stores the mask in the destination operand (first operand). The source operand is an XMM or YMM register, and the destination operand is a general-purpose register. The mask is stored in the 4 or 8 low-order bits of the destination operand. The upper bits of the destination operand beyond the mask are filled with zeros.

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 ¶

DEST[0] ← SRC[31];
DEST[1] ← SRC[63];
DEST[2] ← SRC[95];
DEST[3] ← SRC[127];
IF DEST = r32
    THEN DEST[31:4] ← ZeroExtend;
    ELSE DEST[63:4] ← ZeroExtend;
FI;

(V)MOVMSKPS (128-bit version) ¶

DEST[0] ← SRC[31]
DEST[1] ← SRC[63]
DEST[2] ← SRC[95]
DEST[3] ← SRC[127]
IF DEST = r32
    THEN DEST[31:4]←0;
    ELSE DEST[63:4]←0;
FI

VMOVMSKPS (VEX.256 encoded version) ¶

DEST[0] ← SRC[31]
DEST[1] ← SRC[63]
DEST[2] ← SRC[95]
DEST[3] ← SRC[127]
DEST[4] ← SRC[159]
DEST[5] ← SRC[191]
DEST[6] ← SRC[223]
DEST[7] ← SRC[255]
IF DEST = r32
    THEN DEST[31:8]←0;
    ELSE DEST[63:8]←0;
FI

Intel C/C++ Compiler Intrinsic Equivalent ¶

int _mm_movemask_ps(__m128 a)

int _mm256_movemask_ps(__m256 a)

SIMD Floating-Point Exceptions ¶

None.

Other Exceptions ¶

See Exceptions Type 7; additionally

#UD	If VEX.vvvv ≠ 1111B.