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hashlib: don't xorshift in between upper and lower word

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This commit is contained in:
Emil J. Tywoniak 2024-10-30 10:48:09 +01:00
parent 209ab6fb72
commit c1af19fabc
1 changed files with 2 additions and 1 deletions
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3
kernel/hashlib.h
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@ -99,17 +99,18 @@ class Hasher {
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static uint32_t mkhash(uint32_t a, uint32_t b) { static uint32_t mkhash(uint32_t a, uint32_t b) {
uint32_t hash = ((a << 5) + a) ^ b; uint32_t hash = ((a << 5) + a) ^ b;
hash = mkhash_xorshift(fudge ^ hash);
return hash; return hash;
} }
public: public:
void hash32(uint32_t i) { void hash32(uint32_t i) {
state = mkhash(i, state); state = mkhash(i, state);
state = mkhash_xorshift(fudge ^ state);
return; return;
} }
void hash64(uint64_t i) { void hash64(uint64_t i) {
state = mkhash((uint32_t)(i % (1ULL << 32ULL)), state); state = mkhash((uint32_t)(i % (1ULL << 32ULL)), state);
state = mkhash((uint32_t)(i >> 32ULL), state); state = mkhash((uint32_t)(i >> 32ULL), state);
state = mkhash_xorshift(fudge ^ state);
return; return;
} }
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