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improved buckethash

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Zeno Rogue
2025-06-07 16:18:00 +02:00
parent bf5e61d4bd
commit c8483b570c
2 changed files with 24 additions and 15 deletions
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27
hyperpoint.cpp
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@@ -1834,22 +1834,31 @@ EX ld raddif(ld a, ld b) {
EX int bucket_scale = 10000;
EX unsigned bucketer(ld x) {
return (unsigned) (long long) (floor(x * bucket_scale + .5));
#if HDR
using buckethash_t = uint64_t;
inline void hashmix(buckethash_t& seed, buckethash_t i) { seed ^= i + 0x9e3779b9 + (seed << 6) + (seed >> 2); }
inline buckethash_t hashmix_to(buckethash_t seed, buckethash_t i) { hashmix(seed, i); return seed; }
#endif
EX buckethash_t bucketer(ld x) {
return (buckethash_t) (long long) (floor(x * bucket_scale + .5));
}
EX unsigned bucketer(hyperpoint h) {
unsigned dx = 0;
EX buckethash_t bucketer(hyperpoint h) {
buckethash_t seed = 0;
if(gproduct) {
auto d = product_decompose(h);
h = d.second;
dx += bucketer(d.first) * 50;
hashmix(seed, bucketer(d.first));
if(cgi.emb->is_euc_in_product() && in_h2xe()) h /= h[2];
}
dx += bucketer(h[0]) + 1000 * bucketer(h[1]) + 1000000 * bucketer(h[2]);
if(MDIM == 4) dx += bucketer(h[3]) * 1000000001;
if(elliptic) dx = min(dx, -dx);
return dx;
if(elliptic && make_tuple(h[0], h[1], h[2], h[3]) < make_tuple(-h[0], -h[1], -h[2], -h[3])) h = -h;
hashmix(seed, bucketer(h[0]));
hashmix(seed, bucketer(h[1]));
hashmix(seed, bucketer(h[2]));
if(MDIM == 4) hashmix(seed, bucketer(h[3]));
return seed;
}
#if MAXMDIM >= 4