Developer Guide and Reference

Contents

_mm256_testc_si256

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

Syntax

extern int _mm256_testc_si256(__m256i s1, __m256i s2);
Arguments
s1
first source integer vector
s2
second source integer vector
Description
Allows setting of the CF flag. The CF flag is set based on the result of a bitwise AND and logical NOT operation between the first and second source vectors. The corresponding instruction,
VPTEST
, sets the CF flag if all the resulting bits are 0. If the resulting bits are non-zeros, the instruction clears the CF flag.
Returns
Non-zero if CF flag is set
Zero if the CF 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