Calculates the arc tangent of float64 variables x and y. Vector variant of atan2(x, y) function for a 128-bit/256-bit vector argument of float64 values.
Syntax
extern __m128d _mm_atan2_pd(__m128d v1, __m128 v2); |
extern __m256d _mm256_atan2_pd(__m256d v1, __m256 v2); |
Arguments
v1 |
vector with float64 values |
v2 |
vector with float64 values |
Description
Calculates the arc tangent of corresponding float64 elements of vectors v1 and v2. 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])
...
Note
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.