v?copysign

Copy the sign bit data in src2 and the non-sign bit data in src1 and store the result to dst. The inputs are vectors.

Interface Definition

C interface:

void vscopysign(const int len, const float* src1, const float* src2, float* dst);

void vdcopysign(const int len, const double* src1, const double* src2, double* dst);

Parameters

Parameter	Type	Description	Input/Output
len	Integer	Number of elements in the input vector. If len ≤ 0, an invalid parameter error is reported and the function returns.	Input
src1	Single-precision floating-point type for vscopysign Double-precision floating-point type for vdcopysign	Input vector src1 with length len. If the pointer is null, a null pointer error is reported and the function returns.	Input
src2	Single-precision floating-point type for vscopysign Double-precision floating-point type for vdcopysign	Input vector src2 with length len. If the pointer is null, a null pointer error is reported and the function returns.	Input
dst	Single-precision floating-point type for vscopysign Double-precision floating-point type for vdcopysign	Output vector dst with length len. If the pointer is null, a null pointer error is reported and the function returns.	Output

Return Value

Each operation value returns the result obtained by copying the sign bit of x2 to x1.
For special values, see the following table.
Input Value 1 (src1)

Sign Bit of the Input Value 2 (src2)

Output Value (dst)

±inf

0

+inf

±inf

1

-inf

nan

0

nan

nan

1

-nan

Input Value 1 (src1)	Sign Bit of the Input Value 2 (src2)	Output Value (dst)
±inf	0	+inf
±inf	1	-inf
nan	0	nan
nan	1	-nan

Dependencies

C: "kvml.h"

Examples

C interface:

    int i, len = 8; 
    float src1[8] = {-1.5f, -0.0f, 0.0f, 1.0f, 1.5f, -INFINITY, INFINITY, NAN};
    float src2[8] = {1.5f, 0.0f, +0.0f, -1.0f, -1.5f, +INFINITY, -INFINITY, -NAN}; 
    float* dst = (float*)malloc(sizeof(float) * len); 
    if (dst == NULL) { 
        printf("Malloc Failed!\n"); 
        return 0;
    }
    vscopysign(len, src1, src2, dst);

    /** 
     *  Output dst: 
     *     1.500000 0.000000 0.000000 -1.000000 -1.500000 inf -inf -nan
     */

Parent topic: Function Syntax