Const conversions Uint128 -> Uint256 and Uint256 -> Uint512 #1110
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Looking commit by commit might make this a bit clearer in this case, I think. ...except for the part where I forgot to update the commit msg. Ahem. |
packages/std/src/math/uint256.rs
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| let words: [u64; 4] = [ | ||
| u64::from_le_bytes([ | ||
| bytes[0], bytes[1], bytes[2], bytes[3], bytes[4], bytes[5], bytes[6], bytes[7], | ||
| ]), | ||
| u64::from_le_bytes([ | ||
| bytes[8], bytes[9], bytes[10], bytes[11], bytes[12], bytes[13], bytes[14], | ||
| bytes[15], | ||
| ]), | ||
| 0, | ||
| 0, | ||
| ]; | ||
| Self(U256(words)) |
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Wouldn't it be nice to reuse Self::from_be_bytes here? This reduces the places where we mess with U256 internals.
packages/std/src/math/uint512.rs
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| 0, | ||
| ]; | ||
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| Self(U512(words)) |
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And with #1111 we can do the same here too, right?
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I wonder if that would introduce some overhead though when this function isn't used in a const context. Does it matter? Probably not.
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Good question. Compared to every serialization/deserialization all this conversion is trivial. I think it would be good to avoid exposing implementation details here. Ever Uint* type should have efficient BE/LE exporters and importers. Let's focus on those.
| bytes[8], bytes[9], bytes[10], bytes[11], bytes[12], bytes[13], bytes[14], bytes[15], | ||
| 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, | ||
| ]) | ||
| } |
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Rebased. |
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Do you implement |
That's exactly what I was doing 👍 |
Closes #1107