# _mm256_castsi256_pd

Typecasts 256-bit integer values to double-precision floating point values. No corresponding Intel® AVX instruction.

## Syntax

extern __m256d _mm256_castsi256_pd(__m256i a);

## Arguments

a | 256-bit integer vector

## Description

Performs a typecast operation from 256-bit integer values to double-precision floating point values (float64 values). This intrinsic does not introduce extra moves to the generated code. Source operand bits are passed unchanged to the result.

## Returns

A vector with double-precision floating point values.

Parent topic: Support Intrinsics for Vector Typecasting Operations