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-rw-r--r--vppinfra/vppinfra/random.h17
1 files changed, 7 insertions, 10 deletions
diff --git a/vppinfra/vppinfra/random.h b/vppinfra/vppinfra/random.h
index fad05898350..5c139d05490 100644
--- a/vppinfra/vppinfra/random.h
+++ b/vppinfra/vppinfra/random.h
@@ -119,17 +119,14 @@ random_default_seed (void)
#endif
/** \brief 64-bit random number generator
-
- created via two calls to random_u32(). Quick and dirty.
-*/
+ * Again, constants courtesy of Donald Knuth.
+ *
+ */
always_inline u64
-random_u64 (u32 * seed)
+random_u64 (u64 * seed)
{
- u64 result;
-
- result = (u64) random_u32 (seed) << 32;
- result |= random_u32 (seed);
- return result;
+ *seed = 6364136223846793005ULL * *seed + 1442695040888963407ULL;
+ return *seed;
}
/** \brief machine word size random number generator */
@@ -138,7 +135,7 @@ always_inline uword
random_uword (u32 * seed)
{
if (sizeof (uword) == sizeof (u64))
- return random_u64 (seed);
+ return random_u64 ((u64 *) seed);
else
return random_u32 (seed);
}