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[set] Use better hash

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This commit is contained in:
Behdad Esfahbod 2023-05-09 12:06:35 -06:00
parent fe3339ea24
commit a58bbe5408
2 changed files with 6 additions and 5 deletions
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5
src/hb-bit-page.hh
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@ -104,10 +104,7 @@ struct hb_bit_page_t
}
uint32_t hash () const
{
return
+ hb_iter (v)
| hb_reduce ([] (uint32_t h, const elt_t &_) { return h * 31 + hb_hash (_); }, (uint32_t) 0u)
;
return hb_bytes_t ((const char *) &v, sizeof (v)).hash ();
}
void add (hb_codepoint_t g) { elt (g) |= mask (g); }

6
src/hb-bit-set.hh
View file

@ -134,7 +134,11 @@ struct hb_bit_set_t
{
uint32_t h = 0;
for (auto &map : page_map)
h = h * 31 + hb_hash (map.major) + hb_hash (pages[map.index]);
{
auto &page = pages.arrayZ[map.index];
if (unlikely (page.is_empty ())) continue;
h = h * 31 + hb_hash (map.major) + hb_hash (page);
}
return h;
}