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Fix the fat, flat line bug

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git-svn-id: http://svn.code.sf.net/p/nuttx/code/trunk@5407 42af7a65-404d-4744-a932-0658087f49c3
This commit is contained in:
patacongo
2012-12-02 17:34:08 +00:00
parent 3f5c105156
commit d128c03666
7 changed files with 443 additions and 106 deletions
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nuttx/libc/stdlib/lib_rand.c
+22 -12
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@@ -174,17 +174,22 @@ static inline void fgenerate2(void)
{
unsigned long randint;
/* Second order congruential generator. One may be added to the result of the
* generated value to avoid the value zero (I am not sure if this is necessary
* for higher order random number generators or how this may effect the quality
* of the generated numbers).
*/
/* Second order congruential generator. */
randint = (RND2_CONSTK1 * g_randint1 +
RND2_CONSTK2 * g_randint2) % RND2_CONSTP;
g_randint2 = g_randint1;
g_randint1 = (randint == 0 ? 1 : randint);
g_randint1 = randint;
/* We cannot permit both values to become zero. That would be fatal for the
* second order random number generator.
*/
if (g_randint2 == 0 && g_randint1 == 0)
{
g_randint2 = 1;
}
}
#if (CONFIG_LIB_RAND_ORDER == 2)
@@ -207,11 +212,7 @@ static inline void fgenerate3(void)
{
unsigned long randint;
/* Third order congruential generator. One may be added to the result of the
* generated value to avoid the value zero (I am not sure if this is necessary
* for higher order random number generators or how this may effect the quality
* of the generated numbers).
*/
/* Third order congruential generator. */
randint = (RND3_CONSTK1 * g_randint1 +
RND3_CONSTK2 * g_randint2 +
@@ -219,7 +220,16 @@ static inline void fgenerate3(void)
g_randint3 = g_randint2;
g_randint2 = g_randint1;
g_randint1 = (randint == 0 ? 1 : randint);
g_randint1 = randint;
/* We cannot permit all three values to become zero. That would be fatal for the
* third order random number generator.
*/
if (g_randint3 == 0 && g_randint2 == 0 && g_randint1 == 0)
{
g_randint3 = 1;
}
}
static double_t frand3(void)