vrecp - Vector reciprocal 1/x

15.9 vrecp - Vector reciprocal $1/x$

#include <mvec.h> 
 
void vrecp (int n, double *restrict z, int incz, const double *restrict x, 
            int incx, const double *restrict y, int incy); 
void vrecpf(int n, float *restrict z, int incz, const float *restrict x, 
            int incx, const float *restrict y, int incy); 
 
 
#include <mvec64.h> 
 
void vrecp_64 (long n, double *restrict y, long incy, const double *restrict x, 
               long incx, const double *restrict y, int incy); 
void vrecpf_64(long n, float *restrict y, long incy, const float *restrict x, 
               long incx, const float *restrict y, int incy);

Given input vector $x$ and a result vector $y$ , this function computes

y= 1/x

15.9.1 Parameters

N - INTEGER: ENTRY: Number of elements of $x$ and $y$ .
CONSTRAINT: $n ≥1$ .
Y - ARRAY OF REAL: EXIT: Result vector $y$ .
CONSTRAINT: Must contain $n× incy$ elements.
CONSTRAINT: Must not overlap with array $x$ .
INCY - INTEGER: ENTRY: Stride for the vector $y$ .
CONSTRAINT: $incy̸= 0$ .
BEHAVIOR: A negative stride will traverse the array in reverse.
X - ARRAY OF REAL: ENTRY: Input vector $x$ .
CONSTRAINT: Must contain $n× incx$ elements.
CONSTRAINT: Must not overlap with array $y$ .
INCX - INTEGER: ENTRY: Stride for the vector $x$ .
CONSTRAINT: $incx̸= 0$ .
BEHAVIOR: A negative stride will traverse the array in reverse.

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