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# Manual Reference Pages  -  HPL_XJUMPM (3)

### NAME

HPL_xjumpm - Compute constants to jump in the random sequence.

Synopsis
Description
Arguments

### SYNOPSIS

#include "hpl.h"

void HPL_xjumpm( const int JUMPM, int * MULT, int * IADD, int * IRANN, int * IRANM, int * IAM, int * ICM );

### DESCRIPTION

HPL_xjumpm computes the constants A and C to jump JUMPM numbers in the random sequence: X(n+JUMPM) = A*X(n)+C. The constants encoded in MULT and IADD specify how to jump from one entry in the sequence to the next.

### ARGUMENTS

 JUMPM (local input) const int On entry, JUMPM specifies the number of entries in the sequence to jump over. When JUMPM is less or equal than zero, A and C are not computed, IRANM is set to IRANN corresponding to a jump of size zero. MULT (local input) int * On entry, MULT is an array of dimension 2, that contains the 16-lower and 15-higher bits of the constant a to jump from X(n) to X(n+1) = a*X(n) + c in the random sequence. IADD (local input) int * On entry, IADD is an array of dimension 2, that contains the 16-lower and 15-higher bits of the constant c to jump from X(n) to X(n+1) = a*X(n) + c in the random sequence. IRANN (local input) int * On entry, IRANN is an array of dimension 2. that contains the 16-lower and 15-higher bits of the encoding of X(n). IRANM (local output) int * On entry, IRANM is an array of dimension 2. On exit, this array contains respectively the 16-lower and 15-higher bits of the encoding of X(n+JUMPM). IAM (local output) int * On entry, IAM is an array of dimension 2. On exit, when JUMPM is greater than zero, this array contains the encoded constant A to jump from X(n) to X(n+JUMPM) in the random sequence. IAM(0:1) contains respectively the 16-lower and 15-higher bits of this constant A. When JUMPM is less or equal than zero, this array is not referenced. ICM (local output) int * On entry, ICM is an array of dimension 2. On exit, when JUMPM is greater than zero, this array contains the encoded constant C to jump from X(n) to X(n+JUMPM) in the random sequence. ICM(0:1) contains respectively the 16-lower and 15-higher bits of this constant C. When JUMPM is less or equal than zero, this array is not referenced.