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Code Issues 1 Releases Wiki Activity

Revert to better performing number hash.

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This commit is contained in:
Felix Riedel
2020-12-27 14:05:40 +00:00
parent a2c837a99c
commit 0d46352ff4
1 changed files with 7 additions and 8 deletions
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15
src/core/value.c
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@@ -268,14 +268,13 @@ int32_t janet_hash(Janet x) {
if (isnan(num) || isinf(num) || num == 0) {
hash = 0;
} else {
int e = 0;
double rest = frexp(num, &e);
int64_t intrest = (int64_t)(rest * JANET_INTMAX_DOUBLE);
uint32_t accum = (uint32_t)((intrest >> 22) ^ intrest);
accum ^= 0x9e3779b9 + (accum << 3) + (accum >> 2);
accum += (int32_t)(e);
accum ^= 0x9e3779b9 + (accum << 3) + (accum >> 2);
hash = (int32_t) accum;
hash = (int32_t)num;
hash = ((hash >> 16) ^ hash) * 0x45d9f3b;
hash = ((hash >> 16) ^ hash) * 0x45d9f3b;
hash = (hash >> 16) ^ hash;
uint32_t lo = (uint32_t)(janet_u64(x) & 0xFFFFFFFF);
hash ^= lo + 0x9e3779b9 + (hash<<6) + (hash>>2);
}
break;
}