# _mm256_permute2f128_pd

Permutes 128-bit double-precision floating point containing fields into a 256-bit destination vector. The corresponding Intel® AVX instruction is VPERM2F128.

## Syntax

extern __m256d _mm256_permute2f128_pd(__m256d m1, __m256d m2, int control);

## Arguments

m1 | a 256-bit float64 source vector
m2 | a 256-bit float64 source vector
control | an immediate byte that specifies two 2-bit control fields and two additional bits which specify zeroing behavior.

## Description

Permutes 128-bit floating-point-containing fields from the first source vector m1 and second source vector m2, by using bits in the 8-bit control argument.

## Returns

A 256-bit float64 vector with permuted values.

Parent topic: Intrinsics for Permute Operations