# _mm256_movemask_pd

Extracts float64 sign mask. The corresponding Intel® AVX instruction is VMOVMSKPD.

## Syntax

extern int _mm256_movemask_pd(__m256d a);

## Arguments

a | float64 source vector

## Description

Performs an extract operation of sign bits from four double-precision floating point elements (float64 elements) of the source vector a, and composes them into bitmasks.

## Returns

An integer bitmask of four meaningful bits.

Parent topic: Intrinsics for Miscellaneous Operations