v?invsqrt

Interface Definition

C interface:

void vsinvsqrt(const int len, const float *src, float *dst);

void vdinvsqrt(const int len, const double *src, double *dst);

Parameters

Parameter	Type	Description	Input/Output
len	Integer	Number of elements in the input vector. If len ≤ 0, the system displays a message indicating that the value of len is invalid.	Input
src	Single-precision floating-point type for vsinvsqrt Double-precision floating-point type for vdinvsqrt	Input vector src with length len. If the pointer is null, the system prompts a null pointer error.	Input
dst	Single-precision floating-point type for vsinvsqrt Double-precision floating-point type for vdinvsqrt	Output vector dst with length len. If the pointer is null, the system prompts a null pointer error.	Output

Parameter

Type

Description

Input/Output

len

Integer

Number of elements in the input vector.

If len ≤ 0, the system displays a message indicating that the value of len is invalid.

Input

src

Single-precision floating-point type for vsinvsqrt
Double-precision floating-point type for vdinvsqrt

Input vector src with length len.

If the pointer is null, the system prompts a null pointer error.

Input

dst

Single-precision floating-point type for vsinvsqrt
Double-precision floating-point type for vdinvsqrt

Output vector dst with length len.

If the pointer is null, the system prompts a null pointer error.

Output

Return Value

The reciprocal of the square root of each operation value is returned.

Input Value (src)	Output Value (dst)
+0	+inf
-0	-inf
+inf	+0
<0	nan
nan	nan

Dependency

C: "kvml.h"

Examples

C interface:

    #define N 4
    const float src[N] = {-8.0f, 25.0f, +INFINITY, -0.0f};
    float dst[N] = {0};

    vsinvsqrt(N, src, dst);
    printFArr("input :", N, src);    
    printFArr("output:", N, dst);
 
    /** 
     *  input :  -8.000   25.000      inf   -0.000 
     *  output:     nan    0.200    0.000     -inf
     * 
     */

Parent topic: Function Syntax