Support for more backends #797
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Pratyush
requested review from
z-tech,
mmagician and
weikengchen
and removed request for
a team
tcoratger
reviewed
Feb 27, 2024
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| pub(super) const fn mul_without_cond_subtract(mut self, other: &Self) -> (bool, Self) { | ||
| let (mut lo, mut hi) = ([0u64; N], [0u64; N]); |
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Why not using the MulBuffer helper here for an easier manipulation?
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Good question, it's been a while since I looked at this code =)
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This is the basically tackling #769 (comment) right? |
mmagician
reviewed
Mar 6, 2024
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| // We compute this as follows. | ||
| // First, MODULUS mod 2^64 is just the lower 64 bits of MODULUS. | ||
| // Hence MODULUS mod 2^64 = MODULUS.0[0] mod 2^64. | ||
| // |
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As a follow-up to this PR, the next step would be to rename this existing BigInt to BigInt64, and then also add a BigInt32, correct?
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| /// Does the modulus have a spare unused bit (i.e., the MSB is 0) | ||
| /// | ||
| /// This condition applies if | ||
| /// (a) `Self::MODULUS[N-1] >> 63 == 0` |
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The comment Self::MODULUS[N-1] >> 63 == 0 would (later) need to be changed to reflect that the underlying representation might be other than an array of u64s.
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| /// (MODULUS + 1) / 4 when MODULUS % 4 == 3. Used for square root precomputations. | ||
| /// | ||
| /// Can be computed if the `BigInt` type has a `plus_one_div_four` method. |
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And otherwise?
Do you mean if plus_one_div_four returns Some(...)?
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Description
closes: #XXXX
Before we can merge this PR, please make sure that all the following items have been
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Pendingsection inCHANGELOG.mdFiles changedin the GitHub PR explorer