# _mm256_permute_pd, _mm_permute_pd

Permutes 256-bit or 128-bit float64 values into a 256-bit or 128-bit destination vector. The corresponding Intel® AVX instruction is VPERMILPD.

## Syntax

extern __m256d _mm256_permute_pd(__m256d m1, int control);

extern __m128d _mm_permute_pd(__m128d m1, int control);

## Arguments

m1 | a 256-bit or 128-bit float64 vector
control | an integer specified as an 8-bit immediate; for the 256-bit m1 vector this integer contains four 1-bit control fields in the low 4 bits of the immediate for the 128-bit m1 vector this integer contains two 1-bit control fields in the low 2 bits of the immediate

## Description

The _mm256_permute_pd intrinsic permutes double-precision floating point elements (float64 elements) in the 256-bit source vector m1, according to a specified 1-bit control field, control, and stores the result in a destination vector.

The _mm_permute_pd intrinsic permutes double-precision floating point elements (float64 elements) in the 128-bit source vector m1, according to a specified 1-bit control field, control, and stores the result in a destination vector.

## Returns

A 256-bit or 128-bit float64 vector with permuted values.

Parent topic: Intrinsics for Permute Operations