Developer Guide and Reference



Calculates the inverse tangent of float32 variables x and y. Vector variant of atan2(x, y) function for a 128-bit/256-bit vector argument of float32 values.


extern __m128 _mm_atan2_ps(__m128 v1, __m128 v2);
extern __m256 _mm256_atan2_ps(__m256 v1, __m256 v2);
vector with float32 values
vector with float32 values
Calculates the arc tangent of corresponding float32 elements of vectors
. The following is an illustration of the atan2 operation:
Res[0] = atan2(v1[0], v2[0]) Res[1] = atan2(v1[1], v2[1]) Res[2] = atan2(v1[2], v2[2]) Res[15] = atan2(v1[15], v2[15]) ...
This calculation is similar to calculating the arc tangent of
y / x
, except that the signs of both arguments are used to determine the quadrant of the result.
128-bit/256-bit vector with the result of the operation.
Many routines in the
library are more optimized for Intel® microprocessors than for non-Intel microprocessors.

Product and Performance Information


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