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Fix visibility of get_limbs_representations #139

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Fix visibility of get_limbs_representations #139

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eb2c255
Fix visibility of `get_limbs_representations`
skaunov Feb 8, 2024
78c4820
Visibility doc update, tiny style fixes
skaunov Feb 9, 2024
ae57a78
Update src/fields/emulated_fp/allocated_field_var.rs
Pratyush Mar 19, 2024
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29 changes: 14 additions & 15 deletions src/fields/emulated_fp/allocated_field_var.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -302,9 +302,9 @@ impl<TargetF: PrimeField, BaseF: PrimeField> AllocatedEmulatedFpVar<TargetF, Bas
Ok(inverse)
}

/// Convert a `TargetF` element into limbs (not constraints)
/// This is an internal function that would be reused by a number of other
/// functions
/// Convert a `TargetF` element into limbs (not constraints).
/// This is a utility function intended
/// to be reused by a number of other functions.
pub fn get_limbs_representations(
elem: &TargetF,
optimization_type: OptimizationType,
Expand Down Expand Up @@ -453,18 +453,17 @@ impl<TargetF: PrimeField, BaseF: PrimeField> AllocatedEmulatedFpVar<TargetF, Bas
);

// Get p
let p_representations =
AllocatedEmulatedFpVar::<TargetF, BaseF>::get_limbs_representations_from_big_integer(
&<TargetF as PrimeField>::MODULUS,
self.get_optimization_type(),
)?;
let p_representations = Self::get_limbs_representations_from_big_integer(
&<TargetF as PrimeField>::MODULUS,
self.get_optimization_type(),
)?;
let p_bigint = limbs_to_bigint(params.bits_per_limb, &p_representations);

let mut p_gadget_limbs = Vec::new();
for limb in p_representations.iter() {
p_gadget_limbs.push(FpVar::<BaseF>::Constant(*limb));
}
let p_gadget = AllocatedEmulatedFpVar::<TargetF, BaseF> {
let p_gadget = Self {
cs: self.cs(),
limbs: p_gadget_limbs,
num_of_additions_over_normal_form: BaseF::one(),
Expand All @@ -474,8 +473,8 @@ impl<TargetF: PrimeField, BaseF: PrimeField> AllocatedEmulatedFpVar<TargetF, Bas

// Get delta = self - other
let cs = self.cs().or(other.cs()).or(should_enforce.cs());
let mut delta = self.sub_without_reduce(other)?;
delta = should_enforce.select(&delta, &Self::zero(cs.clone())?)?;
let delta = self.sub_without_reduce(other)?;
let delta = should_enforce.select(&delta, &Self::zero(cs.clone())?)?;

// Allocate k = delta / p
let k_gadget = FpVar::<BaseF>::new_witness(ns!(cs, "k"), || {
Expand Down Expand Up @@ -621,10 +620,10 @@ impl<TargetF: PrimeField, BaseF: PrimeField> AllocatedEmulatedFpVar<TargetF, Bas
}

/// Allocates a new non-native field witness with value given by the
/// function `f`. Enforces that the field element has value in `[0, modulus)`,
/// and returns the bits of its binary representation.
/// The bits are in little-endian (i.e., the bit at index 0 is the LSB) and the
/// bit-vector is empty in non-witness allocation modes.
/// function `f`. Enforces that the field element has value
/// in `[0, modulus)`, and returns the bits of its binary representation.
/// The bits are in little-endian (i.e., the bit at index 0 is the LSB) and
/// the bit-vector is empty in non-witness allocation modes.
pub fn new_witness_with_le_bits<T: Borrow<TargetF>>(
cs: impl Into<Namespace<BaseF>>,
f: impl FnOnce() -> Result<T, SynthesisError>,
Expand Down
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