Developer Guide and Reference

Contents

_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

Product and Performance Information

1

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804