HPL_xjumpm(3)

1HPL_xjumpm(3)                HPL Library Functions               HPL_xjumpm(3)
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NAME

6       HPL_xjumpm - Compute constants to jump in the random sequence.
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SYNOPSIS

9       #include "hpl.h"
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11       void  HPL_xjumpm( const int JUMPM, int * MULT, int * IADD, int * IRANN,
12       int * IRANM, int * IAM, int * ICM );
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DESCRIPTION

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

21       JUMPM   (local input)           const int
22               On  entry,   JUMPM  specifies  the  number  of entries  in  the
23               sequence to jump over. When JUMPM is less or equal than zero, A
24               and  C are not computed, IRANM is set to IRANN corresponding to
25               a jump of size zero.
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27       MULT    (local input)           int *
28               On entry, MULT is an array of dimension 2,  that  contains  the
29               16-lower   and  15-higher bits of the constant  a  to jump from
30               X(n) to X(n+1) = a*X(n) + c in the random sequence.
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32       IADD    (local input)           int *
33               On entry, IADD is an array of dimension 2,  that  contains  the
34               16-lower   and  15-higher bits of the constant  c  to jump from
35               X(n) to X(n+1) = a*X(n) + c in the random sequence.
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37       IRANN   (local input)           int *
38               On entry, IRANN is an array of dimension 2. that  contains  the
39               16-lower and 15-higher bits of the encoding of X(n).
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41       IRANM   (local output)          int *
42               On  entry,   IRANM  is an array of dimension 2.   On exit, this
43               array  contains respectively  the 16-lower and  15-higher  bits
44               of the encoding of X(n+JUMPM).
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46       IAM     (local output)          int *
47               On  entry,  IAM is an array of dimension 2. On exit, when JUMPM
48               is  greater  than  zero,  this  array  contains   the   encoded
49               constant   A   to jump from  X(n) to  X(n+JUMPM)  in the random
50               sequence. IAM(0:1)  contains  respectively  the   16-lower  and
51               15-higher   bits   of this constant  A. When  JUMPM  is less or
52               equal than zero, this array is not referenced.
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54       ICM     (local output)          int *
55               On entry, ICM is an array of dimension 2. On exit,  when  JUMPM
56               is   greater   than  zero,  this  array  contains  the  encoded
57               constant  C  to jump from  X(n)  to  X(n+JUMPM) in  the  random
58               sequence.  ICM(0:1)   contains  respectively  the  16-lower and
59               15-higher  bits  of this constant  C. When  JUMPM  is  less  or
60               equal than zero, this array is not referenced.
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NAME

SYNOPSIS

DESCRIPTION

ARGUMENTS

SEE ALSO