_mm_atan2_pd

Calculates the arc tangent of float64 variables x and y. Vector variant of atan2(x, y) function for a 128-bit vector argument of two float64 values.

Syntax

extern __m128d __cdecl _mm_atan2_pd(__m128d v1);

Arguments

v1

128-bit vector with float64 values

v1

128-bit vector with float64 values

Description

Performs a bitwise logical AND of the four packed double-precision floating-point elements (float64 elements) of the first source vector, m1, and corresponding elements in the second source vector, m2.

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 iconNote

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.

Returns

Result of the bitwise operation.