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/*
* Copyright 2017 WebAssembly Community Group participants
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/hash-util.h"
#include "config.h"
namespace wabt {
// Hash combiner from:
// http://stackoverflow.com/questions/4948780/magic-number-in-boosthash-combine
hash_code HashCombine(hash_code seed, hash_code y) {
#if SIZEOF_SIZE_T == 4
constexpr hash_code magic = 0x9e3779b9;
#elif SIZEOF_SIZE_T == 8
constexpr hash_code magic = 0x9e3779b97f4a7c16;
#else
#error "weird sizeof size_t"
#endif
seed ^= y + magic + (seed << 6) + (seed >> 2);
return seed;
}
} // namespace wabt
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