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Simplification to ptr_map_hash_key

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gingerBill
2021-11-05 18:04:18 +00:00
parent eb0faf9602
commit 36985f8da0
1 changed files with 5 additions and 15 deletions
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src/ptr_map.cpp
+5 -15
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@@ -28,21 +28,11 @@ 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)
// TODO(bill): Improve ptr_map_hash_key u64 x = (u64)key;
u32 key0 = (u32)(key & 0xffffffff); u8 count = (u8)(x >> 59);
u32 key1 = (u32)(key >> 32); x ^= x >> (5 + count);
x *= 12605985483714917081ull;
u32 word; return (u32)(x ^ (x >> 43));
u32 state = 0;
state += key0 * 747796405u + 2891336453u;
word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
state = (word >> 22u) ^ word;
state += key1 * 747796405u + 2891336453u;
word = ((state >> ((state >> 28u) + 4u)) ^ state) * 277803737u;
state = (word >> 22u) ^ word;
return state;
#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;