NVIDIA CUDA Library: powf

Single Precision Mathematical Functions

__device__ float powf	(	float	x,
		float	y
	)

Calculate the value of x to the power of y.

Returns:

powf( $\pm 0$ , y) returns $\pm \infty$ for y an integer less than 0.
powf( $\pm 0$ , y) returns $\pm 0$ for y an odd integer greater than 0.
powf( $\pm 0$ , y) returns +0 for y > 0 and not and odd integer.
powf(-1, $\pm \infty$ ) returns 1.
powf(+1, y) returns 1 for any y, even a NaN.
powf(x, $\pm 0$ ) returns 1 for any x, even a NaN.
powf(x, y) returns a NaN for finite x < 0 and finite non-integer y.
powf(x, $-\infty$ ) returns $+\infty$ for .
powf(x, $-\infty$ ) returns +0 for .
powf(x, $+\infty$ ) returns +0 for .
powf(x, $+\infty$ ) returns $+\infty$ for .
powf( $-\infty$ , y) returns -0 for y an odd integer less than 0.
powf( $-\infty$ , y) returns +0 for y < 0 and not an odd integer.
powf( $-\infty$ , y) returns $-\infty$ for y an odd integer greater than 0.
powf( $-\infty$ , y) returns $+\infty$ for y > 0 and not an odd integer.
powf( $+\infty$ , y) returns +0 for y < 0.
powf( $+\infty$ , y) returns $+\infty$ for y > 0.

Note:: For accuracy information for this function see the CUDA C Programming Guide, Appendix C, Table C-1.

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