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math/rand: add choice_bit_set

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Laytan Laats
2024-10-26 13:50:28 +02:00
parent 831558a7c2
commit 10c2f8dbeb
2 changed files with 50 additions and 13 deletions
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14
base/runtime/core_builtin.odin
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@@ -939,19 +939,7 @@ map_upsert :: proc(m: ^$T/map[$K]$V, key: K, value: V, loc := #caller_location)
@builtin
card :: proc "contextless" (s: $S/bit_set[$E; $U]) -> int {
when size_of(S) == 1 {
return int(intrinsics.count_ones(transmute(u8)s))
} else when size_of(S) == 2 {
return int(intrinsics.count_ones(transmute(u16)s))
} else when size_of(S) == 4 {
return int(intrinsics.count_ones(transmute(u32)s))
} else when size_of(S) == 8 {
return int(intrinsics.count_ones(transmute(u64)s))
} else when size_of(S) == 16 {
return int(intrinsics.count_ones(transmute(u128)s))
} else {
#panic("Unhandled card bit_set size")
}
return int(intrinsics.count_ones(transmute(intrinsics.type_bit_set_underlying_type(S))s))
}