ed/Odin
1
0
Fork 0
mirror of https://github.com/Ed94/Odin.git synced 2026-08-06 15:48:51 +00:00
Code Issues Packages Projects Releases Wiki Activity

Improve ptr_map_hash_key

Browse Source
This commit is contained in:
gingerBill
2021-11-16 16:08:20 +00:00
parent 1b28226a67
commit bb7703fcec
1 changed files with 7 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/ptr_map.cpp
+7 -5
View File
@@ -28,11 +28,13 @@ struct PtrMap {
u32 ptr_map_hash_key(uintptr key) { u32 ptr_map_hash_key(uintptr key) {
#if defined(GB_ARCH_64_BIT) #if defined(GB_ARCH_64_BIT)
u64 x = (u64)key; key = (~key) + (key << 21);
u8 count = (u8)(x >> 59); key = key ^ (key >> 24);
x ^= x >> (5 + count); key = (key + (key << 3)) + (key << 8);
x *= 12605985483714917081ull; key = key ^ (key >> 14);
return (u32)(x ^ (x >> 43)); key = (key + (key << 2)) + (key << 4);
key = key ^ (key << 28);
return cast(u32)key;
#elif defined(GB_ARCH_32_BIT) #elif defined(GB_ARCH_32_BIT)
u32 state = ((u32)key) * 747796405u + 2891336453u; u32 state = ((u32)key) * 747796405u + 2891336453u;
u32 word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u; u32 word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;