svml128_atan2_f?

Interface Definition

C interface:

float32x4_t svml128_atan2_f32(float32x4_t src);

float64x2_t svml128_atan2_f64(float64x2_t src);

Parameters

Return Value

For atan2(y, x):

• An azimuth from the origin to the point (x, y) is returned, that is, the included angle with reference to the x-axis. The unit of the return value is radian, and the value range is (-π, +π].
• If y is ±0 and x is negative or -0, the return value is ±π.
• If y is ±0 and x is positive or +0, the return value is ±0.
• If y is ±∞ and x is a finite number, the return value is ±π/2.
• If y is ±∞ and x is –∞, the return value is ±3π/4.
• If y is ±∞ and x is +∞, the return value is ±π/4.
• If x is ±0 and y is negative, the return value is -π/2.
• If x is ±0 and y is positive, the return value is +π/2.
• If x is -∞ and y is finite positive, the return value is +π.
• If x is -∞ and y is finite negative, the return value is -π.
• If x is +∞ and y is finite positive, the return value is +0.
• If x is +∞ and y is finite negative, the return value is -0.
• If x or y is NaN, the return value is NaN.

Dependencies

C: "ksvml.h"

Examples

C interface:

    float32x4_t src = {0.0f, 2.0f, INFINITY, NAN};
    float32x4_t src2 = {0.0f, 2.0f, INFINITY, NAN};
    float32x4_t dst = svml128_atan2_f32(src, src2);
    printf("%.15g  %.15g  %.15g  %.15g\n", dst[0], dst[1], dst[2], dst[3]); 
    /**
     *  Output dst:
     *  0  0.785398163397448  0.785398163397448  -nan
     */