# _mm256_testz_si256

Performs a packed bit test of two integer vectors to set the ZF flag. The corresponding Intel® AVX instruction is VPTEST.

## Syntax

extern int _mm256_testz_si256(__m256i s1, __m256i s2);

## Arguments

s1 | first source integer vector
s2 | second source integer vector

## Description

Allows setting of the ZF flag. The ZF flag is set based on the result of a bitwise AND operation between the first and second source vectors. The corresponding instruction VPTEST sets the ZF flag if all the resulting bits are 0. If the resulting bits are non-zeros, the instruction clears the ZF flag.

## Returns

Non-zero if ZF flag is set

Zero if the ZF flag is not set

Parent topic: Intrinsics for Packed Test Operations