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* Increase random cycle at marginal cost and make lower order bits

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more random.
This commit is contained in:
bg- 2007-06-01 15:28:02 +00:00
parent f4a9e896fd
commit 709a5846a8
1 changed files with 2 additions and 2 deletions
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4
core/lib/rand.c
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@ -28,7 +28,7 @@
* *
* This file is part of the Contiki operating system. * This file is part of the Contiki operating system.
* *
* @(#)$Id: rand.c,v 1.3 2007/04/24 19:01:39 bg- Exp $ * @(#)$Id: rand.c,v 1.4 2007/06/01 15:28:02 bg- Exp $
*/ */
#include <stdlib.h> #include <stdlib.h>
@ -59,7 +59,7 @@ int
rand() rand()
{ {
rand_state = (16807*rand_state) % 2147483647ul; rand_state = (16807*rand_state) % 2147483647ul;
return rand_state & RAND_MAX; return (rand_state ^ (rand_state >> 16)) & RAND_MAX;
} }
void void