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merge(3p/absl): subtree merge of Abseil up to e19260f

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... notably, this includes Abseil's own StatusOr type, which
conflicted with our implementation (that was taken from TensorFlow).

Change-Id: Ie7d6764b64055caaeb8dc7b6b9d066291e6b538f
This commit is contained in:
Vincent Ambo 2020-11-21 14:43:54 +01:00
parent cc27324d02
commit 082c006c04
854 changed files with 11260 additions and 5296 deletions
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20
third_party/abseil_cpp/absl/hash/internal/city.h vendored
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@ -56,11 +56,6 @@ namespace absl {
ABSL_NAMESPACE_BEGIN
namespace hash_internal {
typedef std::pair<uint64_t, uint64_t> uint128;
inline uint64_t Uint128Low64(const uint128 &x) { return x.first; }
inline uint64_t Uint128High64(const uint128 &x) { return x.second; }
// Hash function for a byte array.
uint64_t CityHash64(const char *s, size_t len);
@ -71,24 +66,11 @@ uint64_t CityHash64WithSeed(const char *s, size_t len, uint64_t seed);
// Hash function for a byte array. For convenience, two seeds are also
// hashed into the result.
uint64_t CityHash64WithSeeds(const char *s, size_t len, uint64_t seed0,
uint64_t seed1);
uint64_t seed1);
// Hash function for a byte array. Most useful in 32-bit binaries.
uint32_t CityHash32(const char *s, size_t len);
// Hash 128 input bits down to 64 bits of output.
// This is intended to be a reasonably good hash function.
inline uint64_t Hash128to64(const uint128 &x) {
// Murmur-inspired hashing.
const uint64_t kMul = 0x9ddfea08eb382d69ULL;
uint64_t a = (Uint128Low64(x) ^ Uint128High64(x)) * kMul;
a ^= (a >> 47);
uint64_t b = (Uint128High64(x) ^ a) * kMul;
b ^= (b >> 47);
b *= kMul;
return b;
}
} // namespace hash_internal
ABSL_NAMESPACE_END
} // namespace absl