diff options
Diffstat (limited to 'absl/hash/internal/city.cc')
| -rw-r--r-- | absl/hash/internal/city.cc | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/absl/hash/internal/city.cc b/absl/hash/internal/city.cc index 591017ab..8f72dd1b 100644 --- a/absl/hash/internal/city.cc +++ b/absl/hash/internal/city.cc @@ -129,6 +129,7 @@ uint32_t CityHash32(const char *s, size_t len) { // len > 24 uint32_t h = len, g = c1 * len, f = g; + uint32_t a0 = Rotate32(Fetch32(s + len - 4) * c1, 17) * c2; uint32_t a1 = Rotate32(Fetch32(s + len - 8) * c1, 17) * c2; uint32_t a2 = Rotate32(Fetch32(s + len - 16) * c1, 17) * c2; @@ -151,28 +152,28 @@ uint32_t CityHash32(const char *s, size_t len) { f = f * 5 + 0xe6546b64; size_t iters = (len - 1) / 20; do { - uint32_t a0 = Rotate32(Fetch32(s) * c1, 17) * c2; - uint32_t a1 = Fetch32(s + 4); - uint32_t a2 = Rotate32(Fetch32(s + 8) * c1, 17) * c2; - uint32_t a3 = Rotate32(Fetch32(s + 12) * c1, 17) * c2; - uint32_t a4 = Fetch32(s + 16); - h ^= a0; + uint32_t b0 = Rotate32(Fetch32(s) * c1, 17) * c2; + uint32_t b1 = Fetch32(s + 4); + uint32_t b2 = Rotate32(Fetch32(s + 8) * c1, 17) * c2; + uint32_t b3 = Rotate32(Fetch32(s + 12) * c1, 17) * c2; + uint32_t b4 = Fetch32(s + 16); + h ^= b0; h = Rotate32(h, 18); h = h * 5 + 0xe6546b64; - f += a1; + f += b1; f = Rotate32(f, 19); f = f * c1; - g += a2; + g += b2; g = Rotate32(g, 18); g = g * 5 + 0xe6546b64; - h ^= a3 + a1; + h ^= b3 + b1; h = Rotate32(h, 19); h = h * 5 + 0xe6546b64; - g ^= a4; + g ^= b4; g = absl::gbswap_32(g) * 5; - h += a4 * 5; + h += b4 * 5; h = absl::gbswap_32(h); - f += a0; + f += b0; PERMUTE3(f, h, g); s += 20; } while (--iters != 0); |