Remove dead code

src/gadgets/arithmetic_u32.rs

@@ -1,23 +1,13 @@
-use alloc::string::{String, ToString};
-use alloc::vec;
 use alloc::vec::Vec;
-use anyhow::Result;
-use core::marker::PhantomData;
-use plonky2::plonk::circuit_data::CommonCircuitData;
-use plonky2::util::serialization::{Buffer, IoResult, Read, Write};
 
 use plonky2::field::extension::Extendable;
 use plonky2::hash::hash_types::RichField;
-use plonky2::iop::generator::{GeneratedValues, SimpleGenerator};
 use plonky2::iop::target::Target;
-use plonky2::iop::witness::{PartitionWitness, Witness};
 use plonky2::plonk::circuit_builder::CircuitBuilder;
 
 use crate::gates::add_many_u32::U32AddManyGate;
 use crate::gates::arithmetic_u32::U32ArithmeticGate;
 use crate::gates::subtraction_u32::U32SubtractionGate;
-use crate::serialization::{ReadU32, WriteU32};
-use crate::witness::GeneratedValuesU32;
 
 #[derive(Clone, Copy, Debug)]
 pub struct U32Target(pub Target);
@@ -235,58 +225,6 @@ impl<F: RichField + Extendable<D>, const D: usize> CircuitBuilderU32<F, D>
     }
 }
 
-#[derive(Clone, Debug)]
-struct SplitToU32Generator<F: RichField + Extendable<D>, const D: usize> {
-    x: Target,
-    low: U32Target,
-    high: U32Target,
-    _phantom: PhantomData<F>,
-}
-
-impl<F: RichField + Extendable<D>, const D: usize> SimpleGenerator<F, D>
-    for SplitToU32Generator<F, D>
-{
-    fn id(&self) -> String {
-        "SplitToU32Generator".to_string()
-    }
-
-    fn serialize(&self, dst: &mut Vec<u8>, _common_data: &CommonCircuitData<F, D>) -> IoResult<()> {
-        dst.write_target(self.x)?;
-        dst.write_target_u32(self.low)?;
-        dst.write_target_u32(self.high)
-    }
-
-    fn deserialize(src: &mut Buffer, _common_data: &CommonCircuitData<F, D>) -> IoResult<Self> {
-        let x = src.read_target()?;
-        let low = src.read_target_u32()?;
-        let high = src.read_target_u32()?;
-        Ok(Self {
-            x,
-            low,
-            high,
-            _phantom: PhantomData,
-        })
-    }
-
-    fn dependencies(&self) -> Vec<Target> {
-        vec![self.x]
-    }
-
-    fn run_once(
-        &self,
-        witness: &PartitionWitness<F>,
-        out_buffer: &mut GeneratedValues<F>,
-    ) -> Result<()> {
-        let x = witness.get_target(self.x);
-        let x_u64 = x.to_canonical_u64();
-        let low = x_u64 as u32;
-        let high = (x_u64 >> 32) as u32;
-
-        out_buffer.set_u32_target(self.low, low)?;
-        out_buffer.set_u32_target(self.high, high)
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use anyhow::Result;