Make Scalar::from_bits a const fn. #325
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const_fn is stable since Rust 1.31 (rust-lang/rust#54835) and enables calling `Scalar::from_bits(..)` from other const fn contexts, potentially saving some overhead here and there. Especially useful in contexts where constants are being built from a bit pattern.
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Sounds good to me, thanks for the PR! |
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@rubdos This change is published in 2.1.0 |
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We're mostly running against git/develop anyway, doesn't matter too much to me at this time. Thanks for the feedback! EDIT, nvm, we're running bulletproofs against develop, not this :-) |
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const_fnis stable since Rust 1.31 (rust-lang/rust#54835) and enables callingScalar::from_bits(..)from other const fn contexts, potentially saving some overhead here and there.Especially useful in contexts where constants are being built from a bit pattern.
My use case is a constructor for a certain large number, where I'd rather start from a slice and set the correct bits that just hardcode in all 32 bytes at once.
I'm not 100% sure about the compatibility guarantees when switching an existing function to
const, but I imagine it shouldn't interfere anywhere, since the whole test suite still passes.The other constructors use a call to
.reduce(), so I didn't bother looking deeper whether they can be madeconsttoo.