# 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.

# See Also

HPL_ladd,
HPL_lmul,
HPL_setran,
HPL_jumpit,
HPL_rand.