diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/afl-performance.c | 20 |
1 files changed, 14 insertions, 6 deletions
diff --git a/src/afl-performance.c b/src/afl-performance.c index 7a911ffd..28564eb8 100644 --- a/src/afl-performance.c +++ b/src/afl-performance.c @@ -1,10 +1,11 @@ -/* Written in 2019 by David Blackman and Sebastiano Vigna (vigna@acm.org) +/* + Written in 2019 by David Blackman and Sebastiano Vigna (vigna@acm.org) -To the extent possible under law, the author has dedicated all copyright -and related and neighboring rights to this software to the public domain -worldwide. This software is distributed without any warranty. + To the extent possible under law, the author has dedicated all copyright + and related and neighboring rights to this software to the public domain + worldwide. This software is distributed without any warranty. -See <http://creativecommons.org/publicdomain/zero/1.0/>. + See <http://creativecommons.org/publicdomain/zero/1.0/>. This is xoshiro256++ 1.0, one of our all-purpose, rock-solid generators. It has excellent (sub-ns) speed, a state (256 bits) that is large @@ -15,13 +16,17 @@ See <http://creativecommons.org/publicdomain/zero/1.0/>. The state must be seeded so that it is not everywhere zero. If you have a 64-bit seed, we suggest to seed a splitmix64 generator and use its - output to fill s. */ + output to fill s[]. +*/ #include <stdint.h> #include "afl-fuzz.h" #include "types.h" #include "xxh3.h" +/* we use xoshiro256** instead of rand/random because it is 10x faster and has + better randomness properties. */ + static inline uint64_t rotl(const uint64_t x, int k) { return (x << k) | (x >> (64 - k)); @@ -122,6 +127,9 @@ void long_jump(afl_state_t *afl) { } +/* we switch from afl's murmur implementation to xxh3 as it is 30% faster - + and get 64 bit hashes instead of just 32 bit. Less collisions! :-) */ + u32 hash32(const void *key, u32 len, u32 seed) { return XXH64(key, len, seed) % 0x100000000; |