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Make our custom random function consistent on x86 and ia64 systems.

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This commit is contained in:
Nathan Straz
2003-03-24 22:26:02 +00:00
parent 240f0d5b6a
commit a34dd9908e
1 changed files with 12 additions and 11 deletions
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src/random.c
+12 -11
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@@ -20,6 +20,7 @@
*
**************************************************************************/
#include <sys/types.h>
/*
* modified by dxm@sgi.com so that this file acts as a drop in replacement
@@ -29,9 +30,9 @@
/*
* A random number generator called as a function by
* random (iseed) or irandm (iseed)
* The parameter should be a pointer to a 2-element long vector.
* The parameter should be a pointer to a 2-element int32_t vector.
* The first function returns a double uniform in 0 .. 1.
* The second returns a long integer uniform in 0 .. 2**31-1
* The second returns a int32_t integer uniform in 0 .. 2**31-1
* Both update iseed[] in exactly the same way.
* iseed[] must be a 2-element integer vector.
* The initial value of the second element may be anything.
@@ -40,13 +41,13 @@
* The table mt[0:127] is defined by mt[i] = 69069 ** (128-i)
*/
#define MASK ((long) 593970775)
#define MASK ((int32_t) 593970775)
/* or in hex, 23674657 */
#define SCALE ((double) 1.0 / (1024.0 * 1024.0 * 1024.0 * 2.0))
/* i.e. 2 to power -31 */
static long mt [128] = {
static int32_t mt [128] = {
902906369,
2030498053,
-473499623,
@@ -178,9 +179,9 @@ static long mt [128] = {
};
double
_random (long is [2])
_random (int32_t is [2])
{
long it, leh, nit;
int32_t it, leh, nit;
it = is [0];
leh = is [1];
@@ -193,15 +194,15 @@ _random (long is [2])
leh = leh * mt[nit & 127] + nit;
is [0] = it; is [1] = leh;
if (leh < 0) leh = ~leh;
return (SCALE * ((long) (leh | 1)));
return (SCALE * ((int32_t) (leh | 1)));
}
long
_irandm (long is [2])
int32_t
_irandm (int32_t is [2])
{
long it, leh, nit;
int32_t it, leh, nit;
it = is [0];
leh = is [1];
@@ -223,7 +224,7 @@ _irandm (long is [2])
* XXX not thread safe I guess.
*/
static long saved_seed[2];
static int32_t saved_seed[2];
long random(void)
{