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Added mkhash_xorshift()

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This commit is contained in:
Clifford Wolf 2014-12-29 00:12:36 +01:00
parent dede5353b1
commit a2226e5307
4 changed files with 38 additions and 13 deletions
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20
kernel/hashlib.h
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@ -31,6 +31,20 @@ inline unsigned int mkhash_add(unsigned int a, unsigned int b) {
return ((a << 5) + a) + b;
}
inline unsigned int mkhash_xorshift(unsigned int a) {
if (sizeof(a) == 4) {
a ^= a << 13;
a ^= a >> 17;
a ^= a << 5;
} else if (sizeof(a) == 8) {
a ^= a << 13;
a ^= a >> 7;
a ^= a << 17;
} else
throw std::runtime_error("mkhash_xorshift() only implemented for 32 bit and 64 bit ints");
return a;
}
template<typename T> struct hash_ops {
bool cmp(const T &a, const T &b) const {
return a == b;
@ -122,7 +136,11 @@ inline int hashtable_size(int old_size)
if (old_size < 250999999) return 250999999;
if (old_size < 503000009) return 503000009;
if (old_size < 1129999999) return 1129999999;
throw std::length_error("hash table exceeded maximum size");
if (sizeof(old_size) == 4)
throw std::length_error("hash table exceeded maximum size. recompile with -mint64.");
return old_size * 2;
}
template<typename K, typename T, typename OPS = hash_ops<K>>