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Simplify the handling of the hashing calls for maps

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This commit is contained in:
gingerBill
2022-11-13 23:24:08 +00:00
parent a705a2e38b
commit 3edb3d8d8c
3 changed files with 30 additions and 100 deletions
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core/runtime/dynamic_map_internal.odin
+23 -73
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@@ -732,92 +732,42 @@ __dynamic_map_reserve :: proc "odin" (#no_alias m: ^Raw_Map, #no_alias info: ^Ma
// NOTE: the default hashing algorithm derives from fnv64a, with some minor modifications to work for `map` type:
//
// * Convert a `0` result to `1`
// * "empty entry"
// * Prevent the top bit from being set
// * "deleted entry"
//
// Both of these modification are necessary for the implementation of the `map`
INITIAL_HASH_SEED :: 0xcbf29ce484222325
HASH_MASK :: 1 << (8*size_of(uintptr) - 1) -1
_fnv64a :: proc "contextless" (data: []byte, seed: u64 = INITIAL_HASH_SEED) -> u64 {
h: u64 = seed
for b in data {
h = (h ~ u64(b)) * 0x100000001b3
}
h &= HASH_MASK
return h | u64(h == 0)
}
default_hash :: #force_inline proc "contextless" (data: []byte) -> uintptr {
return uintptr(_fnv64a(data))
}
default_hash_string :: #force_inline proc "contextless" (s: string) -> uintptr {
return default_hash(transmute([]byte)(s))
}
default_hash_ptr :: #force_inline proc "contextless" (data: rawptr, size: int) -> uintptr {
s := Raw_Slice{data, size}
return default_hash(transmute([]byte)(s))
}
@(private)
_default_hasher_const :: #force_inline proc "contextless" (data: rawptr, seed: uintptr, $N: uint) -> uintptr where N <= 16 {
h := u64(seed) + 0xcbf29ce484222325
p := uintptr(data)
#unroll for _ in 0..<N {
b := u64((^byte)(p)^)
h = (h ~ b) * 0x100000001b3
p += 1
}
h &= HASH_MASK
return uintptr(h) | uintptr(h == 0)
}
default_hasher_n :: #force_inline proc "contextless" (data: rawptr, seed: uintptr, N: int) -> uintptr {
h := u64(seed) + 0xcbf29ce484222325
p := uintptr(data)
default_hasher :: #force_inline proc "contextless" (data: rawptr, seed: uintptr, N: int) -> uintptr {
h := u64(seed) + INITIAL_HASH_SEED
p := ([^]byte)(data)
for _ in 0..<N {
b := u64((^byte)(p)^)
h = (h ~ b) * 0x100000001b3
p += 1
h = (h ~ u64(p[0])) * 0x100000001b3
p = p[1:]
}
h &= HASH_MASK
return uintptr(h) | uintptr(h == 0)
return uintptr(h) | uintptr(uintptr(h) == 0)
}
// NOTE(bill): There are loads of predefined ones to improve optimizations for small types
default_hasher1 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 1) }
default_hasher2 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 2) }
default_hasher3 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 3) }
default_hasher4 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 4) }
default_hasher5 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 5) }
default_hasher6 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 6) }
default_hasher7 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 7) }
default_hasher8 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 8) }
default_hasher9 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 9) }
default_hasher10 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 10) }
default_hasher11 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 11) }
default_hasher12 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 12) }
default_hasher13 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 13) }
default_hasher14 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 14) }
default_hasher15 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 15) }
default_hasher16 :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr { return #force_inline _default_hasher_const(data, seed, 16) }
default_hasher_string :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr {
h := u64(seed) + 0xcbf29ce484222325
str := (^[]byte)(data)^
for b in str {
h = (h ~ u64(b)) * 0x100000001b3
}
h &= HASH_MASK
return uintptr(h) | uintptr(h == 0)
str := (^[]byte)(data)
return default_hasher(raw_data(str^), seed, len(str))
}
default_hasher_cstring :: proc "contextless" (data: rawptr, seed: uintptr) -> uintptr {
h := u64(seed) + 0xcbf29ce484222325
ptr := (^uintptr)(data)^
for (^byte)(ptr)^ != 0 {
b := (^byte)(ptr)^
h = (h ~ u64(b)) * 0x100000001b3
ptr += 1
h := u64(seed) + INITIAL_HASH_SEED
if ptr := (^[^]byte)(data)^; ptr != nil {
for ptr[0] != 0 {
h = (h ~ u64(ptr[0])) * 0x100000001b3
ptr = ptr[1:]
}
}
h &= HASH_MASK
return uintptr(h) | uintptr(h == 0)
return uintptr(h) | uintptr(uintptr(h) == 0)
}