diff options
Diffstat (limited to 'llvm/lib/Fuzzer/FuzzerTraceState.cpp')
| -rw-r--r-- | llvm/lib/Fuzzer/FuzzerTraceState.cpp | 28 |
1 files changed, 18 insertions, 10 deletions
diff --git a/llvm/lib/Fuzzer/FuzzerTraceState.cpp b/llvm/lib/Fuzzer/FuzzerTraceState.cpp index 7bbc7591fbd..732e1a44fac 100644 --- a/llvm/lib/Fuzzer/FuzzerTraceState.cpp +++ b/llvm/lib/Fuzzer/FuzzerTraceState.cpp @@ -552,26 +552,34 @@ static void AddValueForMemcmp(void *caller_pc, const void *s1, const void *s2, size_t n) { if (!n) return; size_t Len = std::min(n, (size_t)32); - const char *A1 = reinterpret_cast<const char *>(s1); - const char *A2 = reinterpret_cast<const char *>(s2); - size_t LastSameByte = 0; - for (; LastSameByte < Len; LastSameByte++) - if (A1[LastSameByte] != A2[LastSameByte]) + const uint8_t *A1 = reinterpret_cast<const uint8_t *>(s1); + const uint8_t *A2 = reinterpret_cast<const uint8_t *>(s2); + size_t I = 0; + for (; I < Len; I++) + if (A1[I] != A2[I]) break; size_t PC = reinterpret_cast<size_t>(caller_pc); - VP.AddValue((PC & 4095) | (LastSameByte << 12)); + size_t Idx = I * 8; + if (I < Len) + Idx += __builtin_popcountl((A1[I] ^ A2[I])) - 1; + VP.AddValue((PC & 4095) | (Idx << 12)); } static void AddValueForStrcmp(void *caller_pc, const char *s1, const char *s2, size_t n) { if (!n) return; size_t Len = std::min(n, (size_t)32); - size_t LastSameByte = 0; - for (; LastSameByte < Len; LastSameByte++) - if (s1[LastSameByte] != s2[LastSameByte] || s1[LastSameByte] == 0) + const uint8_t *A1 = reinterpret_cast<const uint8_t *>(s1); + const uint8_t *A2 = reinterpret_cast<const uint8_t *>(s2); + size_t I = 0; + for (; I < Len; I++) + if (A1[I] != A2[I] || A1[I] == 0) break; size_t PC = reinterpret_cast<size_t>(caller_pc); - VP.AddValue((PC & 4095) | (LastSameByte << 12)); + size_t Idx = I * 8; + if (I < Len && A1[I]) + Idx += __builtin_popcountl((A1[I] ^ A2[I])) - 1; + VP.AddValue((PC & 4095) | (Idx << 12)); } ATTRIBUTE_TARGET_POPCNT |
