diff options
Diffstat (limited to 'absl/hash/internal/hash.h')
| -rw-r--r-- | absl/hash/internal/hash.h | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/absl/hash/internal/hash.h b/absl/hash/internal/hash.h index ba6d746..bd07677 100644 --- a/absl/hash/internal/hash.h +++ b/absl/hash/internal/hash.h @@ -264,7 +264,12 @@ H AbslHashValue(H hash_state, long double value) { // AbslHashValue() for hashing pointers template <typename H, typename T> H AbslHashValue(H hash_state, T* ptr) { - return hash_internal::hash_bytes(std::move(hash_state), ptr); + auto v = reinterpret_cast<uintptr_t>(ptr); + // Due to alignment, pointers tend to have low bits as zero, and the next few + // bits follow a pattern since they are also multiples of some base value. + // Mixing the pointer twice helps prevent stuck low bits for certain alignment + // values. + return H::combine(std::move(hash_state), v, v); } // AbslHashValue() for hashing nullptr_t |