# Name

**HPL_xjumpm**Compute constants to jump in the random sequence.

# 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.