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Sign-Extension and Zero-Extension Helpers in Odin
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package bit_extension | |
import "core:intrinsics" | |
sign_extend :: #force_inline proc "contextless" ($D: typeid, src: $S) -> D where | |
intrinsics.type_is_integer(D) && | |
intrinsics.type_is_integer(S) && | |
size_of(D) >= size_of(S) | |
{ | |
when size_of(S) == size_of(i128) { | |
when size_of(D) == size_of(i128) do return D(src) | |
} | |
else when size_of(S) == size_of(i64) { | |
when size_of(D) == size_of(i128) do return D(i128(i64(src))) | |
else when size_of(D) == size_of(i64) do return D(src) | |
} | |
else when size_of(S) == size_of(i32) { | |
when size_of(D) == size_of(i128) do return D(i128(i32(src))) | |
else when size_of(D) == size_of(i64) do return D(i64(i32(src))) | |
else when size_of(D) == size_of(i32) do return D(src) | |
} | |
else when size_of(S) == size_of(i16) { | |
when size_of(D) == size_of(i128) do return D(i128(i16(src))) | |
else when size_of(D) == size_of(i64) do return D(i64(i16(src))) | |
else when size_of(D) == size_of(i32) do return D(i32(i16(src))) | |
else when size_of(D) == size_of(i16) do return D(src) | |
} | |
else when size_of(S) == size_of(i8) { | |
when size_of(D) == size_of(i128) do return D(i128(i8(src))) | |
else when size_of(D) == size_of(i64) do return D(i64(i8(src))) | |
else when size_of(D) == size_of(i32) do return D(i32(i8(src))) | |
else when size_of(D) == size_of(i16) do return D(i16(i8(src))) | |
else when size_of(D) == size_of(i8) do return D(src) | |
} | |
else do #panic("unreachable") | |
} | |
zero_extend :: #force_inline proc "contextless" ($D: typeid, src: $S) -> D where | |
intrinsics.type_is_integer(D) && | |
intrinsics.type_is_integer(S) && | |
size_of(D) >= size_of(S) | |
{ | |
when size_of(S) == size_of(u128) { | |
when size_of(D) == size_of(u128) do return D(src) | |
} | |
else when size_of(S) == size_of(u64) { | |
when size_of(D) == size_of(u128) do return D(u128(u64(src))) | |
else when size_of(D) == size_of(u64) do return D(src) | |
} | |
else when size_of(S) == size_of(u32) { | |
when size_of(D) == size_of(u128) do return D(u128(u32(src))) | |
else when size_of(D) == size_of(u64) do return D(u64(u32(src))) | |
else when size_of(D) == size_of(u32) do return D(src) | |
} | |
else when size_of(S) == size_of(u16) { | |
when size_of(D) == size_of(u128) do return D(u128(u16(src))) | |
else when size_of(D) == size_of(u64) do return D(u64(u16(src))) | |
else when size_of(D) == size_of(u32) do return D(u32(u16(src))) | |
else when size_of(D) == size_of(u16) do return D(src) | |
} | |
else when size_of(S) == size_of(u8) { | |
when size_of(D) == size_of(u128) do return D(u128(u8(src))) | |
else when size_of(D) == size_of(u64) do return D(u64(u8(src))) | |
else when size_of(D) == size_of(u32) do return D(u32(u8(src))) | |
else when size_of(D) == size_of(u16) do return D(u16(u8(src))) | |
else when size_of(D) == size_of(u8) do return D(src) | |
} | |
else do #panic("unreachable") | |
} |
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