mirror of
https://github.com/AtHeartEngineer/halo2-examples.git
synced 2026-01-09 01:17:59 -05:00
add new examples
This commit is contained in:
Haichen Shen
865
Cargo.lock
generated
865
Cargo.lock
generated
@@ -2,6 +2,27 @@
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|
||||
version = "0.1.3"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "56dee185309b50d1f11bfedef0fe6d036842e3fb77413abef29f8f8d1c5d4c1c"
|
||||
|
||||
[[package]]
|
||||
name = "unicode-ident"
|
||||
version = "1.0.1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5bd2fe26506023ed7b5e1e315add59d6f584c621d037f9368fea9cfb988f368c"
|
||||
|
||||
[[package]]
|
||||
name = "walkdir"
|
||||
version = "2.3.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "808cf2735cd4b6866113f648b791c6adc5714537bc222d9347bb203386ffda56"
|
||||
dependencies = [
|
||||
"same-file",
|
||||
"winapi",
|
||||
"winapi-util",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasi"
|
||||
version = "0.10.0+wasi-snapshot-preview1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "1a143597ca7c7793eff794def352d41792a93c481eb1042423ff7ff72ba2c31f"
|
||||
|
||||
[[package]]
|
||||
name = "wasi"
|
||||
version = "0.11.0+wasi-snapshot-preview1"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen"
|
||||
version = "0.2.81"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "7c53b543413a17a202f4be280a7e5c62a1c69345f5de525ee64f8cfdbc954994"
|
||||
dependencies = [
|
||||
"cfg-if",
|
||||
"wasm-bindgen-macro",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-backend"
|
||||
version = "0.2.81"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5491a68ab4500fa6b4d726bd67408630c3dbe9c4fe7bda16d5c82a1fd8c7340a"
|
||||
dependencies = [
|
||||
"bumpalo",
|
||||
"lazy_static",
|
||||
"log",
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"wasm-bindgen-shared",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-macro"
|
||||
version = "0.2.81"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "c441e177922bc58f1e12c022624b6216378e5febc2f0533e41ba443d505b80aa"
|
||||
dependencies = [
|
||||
"quote",
|
||||
"wasm-bindgen-macro-support",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-macro-support"
|
||||
version = "0.2.81"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "7d94ac45fcf608c1f45ef53e748d35660f168490c10b23704c7779ab8f5c3048"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
"wasm-bindgen-backend",
|
||||
"wasm-bindgen-shared",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wasm-bindgen-shared"
|
||||
version = "0.2.81"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "6a89911bd99e5f3659ec4acf9c4d93b0a90fe4a2a11f15328472058edc5261be"
|
||||
|
||||
[[package]]
|
||||
name = "web-sys"
|
||||
version = "0.3.58"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "2fed94beee57daf8dd7d51f2b15dc2bcde92d7a72304cdf662a4371008b71b90"
|
||||
dependencies = [
|
||||
"js-sys",
|
||||
"wasm-bindgen",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "weezl"
|
||||
version = "0.1.6"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "9c97e489d8f836838d497091de568cf16b117486d529ec5579233521065bd5e4"
|
||||
|
||||
[[package]]
|
||||
name = "winapi"
|
||||
version = "0.3.9"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
|
||||
dependencies = [
|
||||
"winapi-i686-pc-windows-gnu",
|
||||
"winapi-x86_64-pc-windows-gnu",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-i686-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
|
||||
|
||||
[[package]]
|
||||
name = "winapi-util"
|
||||
version = "0.1.5"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
|
||||
dependencies = [
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "winapi-x86_64-pc-windows-gnu"
|
||||
version = "0.4.0"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
|
||||
|
||||
[[package]]
|
||||
name = "wio"
|
||||
version = "0.2.2"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "5d129932f4644ac2396cb456385cbf9e63b5b30c6e8dc4820bdca4eb082037a5"
|
||||
dependencies = [
|
||||
"winapi",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
name = "wyz"
|
||||
version = "0.5.0"
|
||||
|
||||
13
Cargo.toml
13
Cargo.toml
@@ -5,9 +5,14 @@ edition = "2021"
|
||||
|
||||
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
|
||||
|
||||
[[bin]]
|
||||
name = "example1"
|
||||
path = "src/example1.rs"
|
||||
[lib]
|
||||
name = "halo2_examples"
|
||||
path = "src/lib.rs"
|
||||
|
||||
[features]
|
||||
dev-graph = ["halo2_proofs/dev-graph", "plotters"]
|
||||
|
||||
[dependencies]
|
||||
halo2_proofs = "0.1.0"
|
||||
halo2_proofs = { git = "https://github.com/zcash/halo2.git", rev = "a898d65ae3ad3d41987666f6a03cfc15edae01c4"}
|
||||
plotters = { version = "0.3.0", optional = true }
|
||||
tabbycat = { version = "0.1", features = ["attributes"], optional = true }
|
||||
|
||||
10
README.md
10
README.md
@@ -12,5 +12,13 @@ cargo build
|
||||
|
||||
Run examples
|
||||
```
|
||||
cargo run --bin exmaple1
|
||||
cargo test -- --nocapture test_example1
|
||||
cargo test -- --nocapture test_example2
|
||||
cargo test -- --nocapture test_example3
|
||||
```
|
||||
|
||||
Plot the circuit layout
|
||||
```
|
||||
cargo test --all-features -- --nocapture test_example1
|
||||
cargo test --all-features -- --nocapture test_example2
|
||||
```
|
||||
|
||||
@@ -4,7 +4,6 @@ use halo2_proofs::{
|
||||
arithmetic::FieldExt,
|
||||
circuit::*,
|
||||
plonk::*, poly::Rotation,
|
||||
pasta::Fp, dev::MockProver,
|
||||
};
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
@@ -14,7 +13,7 @@ struct ACell<F: FieldExt>(AssignedCell<F, F>);
|
||||
struct FiboConfig {
|
||||
pub advice: [Column<Advice>; 3],
|
||||
pub selector: Selector,
|
||||
pub instance: Column<Instance>
|
||||
pub instance: Column<Instance>,
|
||||
}
|
||||
|
||||
struct FiboChip<F: FieldExt> {
|
||||
@@ -30,12 +29,12 @@ impl<F: FieldExt> FiboChip<F> {
|
||||
pub fn configure(
|
||||
meta: &mut ConstraintSystem<F>,
|
||||
advice: [Column<Advice>; 3],
|
||||
instance: Column<Instance>,
|
||||
) -> FiboConfig {
|
||||
let col_a = advice[0];
|
||||
let col_b = advice[1];
|
||||
let col_c = advice[2];
|
||||
let selector = meta.selector();
|
||||
let instance = meta.instance_column();
|
||||
|
||||
meta.enable_equality(col_a);
|
||||
meta.enable_equality(col_b);
|
||||
@@ -64,8 +63,8 @@ impl<F: FieldExt> FiboChip<F> {
|
||||
pub fn assign_first_row(
|
||||
&self,
|
||||
mut layouter: impl Layouter<F>,
|
||||
a: Option<F>,
|
||||
b: Option<F>,
|
||||
a: Value<F>,
|
||||
b: Value<F>,
|
||||
) -> Result<(ACell<F>, ACell<F>, ACell<F>), Error>{
|
||||
layouter.assign_region(
|
||||
|| "first row",
|
||||
@@ -76,23 +75,21 @@ impl<F: FieldExt> FiboChip<F> {
|
||||
|| "a",
|
||||
self.config.advice[0],
|
||||
0,
|
||||
|| a.ok_or(Error::Synthesis),
|
||||
|| a,
|
||||
).map(ACell)?;
|
||||
|
||||
let b_cell = region.assign_advice(
|
||||
|| "b",
|
||||
self.config.advice[1],
|
||||
0,
|
||||
|| b.ok_or(Error::Synthesis),
|
||||
|| b,
|
||||
).map(ACell)?;
|
||||
|
||||
let c_val = a.and_then(|a| b.map(|b| a + b));
|
||||
|
||||
let c_cell = region.assign_advice(
|
||||
|| "c",
|
||||
self.config.advice[2],
|
||||
0,
|
||||
|| c_val.ok_or(Error::Synthesis),
|
||||
|| a + b,
|
||||
).map(ACell)?;
|
||||
|
||||
Ok((a_cell, b_cell, c_cell))
|
||||
@@ -113,17 +110,13 @@ impl<F: FieldExt> FiboChip<F> {
|
||||
prev_b.0.copy_advice(|| "a", &mut region, self.config.advice[0], 0)?;
|
||||
prev_c.0.copy_advice(|| "b", &mut region, self.config.advice[1], 0)?;
|
||||
|
||||
let c_val = prev_b.0.value().and_then(
|
||||
|b| {
|
||||
prev_c.0.value().map(|c| *b + *c)
|
||||
}
|
||||
);
|
||||
let c_val = prev_b.0.value().copied() + prev_c.0.value();
|
||||
|
||||
let c_cell = region.assign_advice(
|
||||
|| "c",
|
||||
self.config.advice[2],
|
||||
0,
|
||||
|| c_val.ok_or(Error::Synthesis),
|
||||
|| c_val,
|
||||
).map(ACell)?;
|
||||
|
||||
Ok(c_cell)
|
||||
@@ -135,7 +128,7 @@ impl<F: FieldExt> FiboChip<F> {
|
||||
&self,
|
||||
mut layouter: impl Layouter<F>,
|
||||
cell: &ACell<F>,
|
||||
row: usize
|
||||
row: usize,
|
||||
) -> Result<(), Error> {
|
||||
layouter.constrain_instance(cell.0.cell(), self.config.instance, row)
|
||||
}
|
||||
@@ -143,8 +136,8 @@ impl<F: FieldExt> FiboChip<F> {
|
||||
|
||||
#[derive(Default)]
|
||||
struct MyCircuit<F> {
|
||||
pub a: Option<F>,
|
||||
pub b: Option<F>,
|
||||
pub a: Value<F>,
|
||||
pub b: Value<F>,
|
||||
}
|
||||
|
||||
impl<F: FieldExt> Circuit<F> for MyCircuit<F> {
|
||||
@@ -159,7 +152,8 @@ impl<F: FieldExt> Circuit<F> for MyCircuit<F> {
|
||||
let col_a = meta.advice_column();
|
||||
let col_b = meta.advice_column();
|
||||
let col_c = meta.advice_column();
|
||||
FiboChip::configure(meta, [col_a, col_b, col_c])
|
||||
let instance = meta.instance_column();
|
||||
FiboChip::configure(meta, [col_a, col_b, col_c], instance)
|
||||
}
|
||||
|
||||
fn synthesize(
|
||||
@@ -187,31 +181,53 @@ impl<F: FieldExt> Circuit<F> for MyCircuit<F> {
|
||||
prev_c = c_cell;
|
||||
}
|
||||
|
||||
chip.expose_public(layouter.namespace(|| "output"), &prev_c, 2)?;
|
||||
chip.expose_public(layouter.namespace(|| "out"), &prev_c, 2)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let k = 4;
|
||||
mod tests {
|
||||
use super::MyCircuit;
|
||||
use halo2_proofs::{pasta::Fp, circuit::Value, dev::MockProver};
|
||||
|
||||
let a = Fp::from(1); // F[0]
|
||||
let b = Fp::from(1); // F[1]
|
||||
let out = Fp::from(55); // F[9]
|
||||
#[test]
|
||||
fn test_example1() {
|
||||
let k = 4;
|
||||
|
||||
let circuit = MyCircuit {
|
||||
a: Some(a),
|
||||
b: Some(b),
|
||||
};
|
||||
let a = Fp::from(1); // F[0]
|
||||
let b = Fp::from(1); // F[1]
|
||||
let out = Fp::from(55); // F[9]
|
||||
|
||||
let mut public_input = vec![a, b, out];
|
||||
let circuit = MyCircuit {
|
||||
a: Value::known(a),
|
||||
b: Value::known(b),
|
||||
};
|
||||
|
||||
let prover = MockProver::run(k, &circuit, vec![public_input.clone()]).unwrap();
|
||||
prover.assert_satisfied();
|
||||
let mut public_input = vec![a, b, out];
|
||||
|
||||
public_input[2] += Fp::one();
|
||||
let prover = MockProver::run(k, &circuit, vec![public_input.clone()]).unwrap();
|
||||
// uncomment the following line and the assert will fail
|
||||
// prover.assert_satisfied();
|
||||
let prover = MockProver::run(k, &circuit, vec![public_input.clone()]).unwrap();
|
||||
prover.assert_satisfied();
|
||||
|
||||
public_input[2] += Fp::one();
|
||||
let prover = MockProver::run(k, &circuit, vec![public_input]).unwrap();
|
||||
// uncomment the following line and the assert will fail
|
||||
// prover.assert_satisfied();
|
||||
}
|
||||
|
||||
|
||||
#[cfg(feature = "dev-graph")]
|
||||
#[test]
|
||||
fn plot_fibo1() {
|
||||
use plotters::prelude::*;
|
||||
|
||||
let root = BitMapBackend::new("fib-1-layout.png", (1024, 3096)).into_drawing_area();
|
||||
root.fill(&WHITE).unwrap();
|
||||
let root = root.titled("Fib 1 Layout", ("sans-serif", 60)).unwrap();
|
||||
|
||||
let circuit = MyCircuit::<Fp> { a: Value::unknown(), b: Value::unknown() };
|
||||
halo2_proofs::dev::CircuitLayout::default()
|
||||
.render(4, &circuit, &root)
|
||||
.unwrap();
|
||||
}
|
||||
}
|
||||
|
||||
186
src/example2.rs
Normal file
186
src/example2.rs
Normal file
@@ -0,0 +1,186 @@
|
||||
use std::{marker::PhantomData};
|
||||
use halo2_proofs::{
|
||||
arithmetic::FieldExt,
|
||||
circuit::*,
|
||||
plonk::*,
|
||||
poly::Rotation,
|
||||
};
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
struct ACell<F: FieldExt>(AssignedCell<F, F>);
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
struct FiboConfig {
|
||||
pub advice: Column<Advice>,
|
||||
pub selector: Selector,
|
||||
pub instance: Column<Instance>,
|
||||
}
|
||||
|
||||
struct FiboChip<F: FieldExt> {
|
||||
config: FiboConfig,
|
||||
_marker: PhantomData<F>,
|
||||
}
|
||||
|
||||
impl<F: FieldExt> FiboChip<F> {
|
||||
pub fn construct(config: FiboConfig) -> Self {
|
||||
Self { config, _marker: PhantomData }
|
||||
}
|
||||
|
||||
pub fn configure(
|
||||
meta: &mut ConstraintSystem<F>,
|
||||
advice: Column<Advice>,
|
||||
instance: Column<Instance>,
|
||||
) -> FiboConfig {
|
||||
let selector = meta.selector();
|
||||
|
||||
meta.enable_equality(advice);
|
||||
meta.enable_equality(instance);
|
||||
|
||||
meta.create_gate("add", |meta| {
|
||||
//
|
||||
// advice | selector
|
||||
// a | s
|
||||
// b |
|
||||
// c |
|
||||
//
|
||||
let s = meta.query_selector(selector);
|
||||
let a = meta.query_advice(advice, Rotation::cur());
|
||||
let b = meta.query_advice(advice, Rotation::next());
|
||||
let c = meta.query_advice(advice, Rotation(2));
|
||||
vec![s * (a + b - c)]
|
||||
});
|
||||
|
||||
FiboConfig {
|
||||
advice,
|
||||
selector,
|
||||
instance,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn assign(
|
||||
&self,
|
||||
mut layouter: impl Layouter<F>,
|
||||
nrows: usize,
|
||||
) -> Result<AssignedCell<F, F>, Error>{
|
||||
layouter.assign_region(
|
||||
|| "entire fibonacci table",
|
||||
|mut region| {
|
||||
self.config.selector.enable(&mut region, 0)?;
|
||||
self.config.selector.enable(&mut region, 1)?;
|
||||
|
||||
let mut a_cell = region.assign_advice_from_instance(
|
||||
|| "1", self.config.instance, 0, self.config.advice, 0)?;
|
||||
let mut b_cell = region.assign_advice_from_instance(
|
||||
|| "1", self.config.instance, 1, self.config.advice, 1)?;
|
||||
|
||||
for row in 2..nrows {
|
||||
if row < nrows - 2 {
|
||||
self.config.selector.enable(&mut region, row)?;
|
||||
}
|
||||
|
||||
let c_cell = region.assign_advice(
|
||||
|| "advice",
|
||||
self.config.advice,
|
||||
row,
|
||||
|| a_cell.value().copied() + b_cell.value(),
|
||||
)?;
|
||||
|
||||
a_cell = b_cell;
|
||||
b_cell = c_cell;
|
||||
}
|
||||
|
||||
Ok(b_cell)
|
||||
})
|
||||
}
|
||||
|
||||
pub fn expose_public(
|
||||
&self,
|
||||
mut layouter: impl Layouter<F>,
|
||||
cell: AssignedCell<F, F>,
|
||||
row: usize,
|
||||
) -> Result<(), Error> {
|
||||
layouter.constrain_instance(cell.cell(), self.config.instance, row)
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Default)]
|
||||
struct MyCircuit<F> {
|
||||
pub a: Option<F>,
|
||||
pub b: Option<F>,
|
||||
}
|
||||
|
||||
impl<F: FieldExt> Circuit<F> for MyCircuit<F> {
|
||||
type Config = FiboConfig;
|
||||
type FloorPlanner = SimpleFloorPlanner;
|
||||
|
||||
fn without_witnesses(&self) -> Self {
|
||||
Self::default()
|
||||
}
|
||||
|
||||
fn configure(meta: &mut ConstraintSystem<F>) -> Self::Config {
|
||||
let advice = meta.advice_column();
|
||||
let instance = meta.instance_column();
|
||||
FiboChip::configure(meta, advice, instance)
|
||||
}
|
||||
|
||||
fn synthesize(
|
||||
&self,
|
||||
config: Self::Config,
|
||||
mut layouter: impl Layouter<F>,
|
||||
) -> Result<(), Error> {
|
||||
let chip = FiboChip::construct(config);
|
||||
|
||||
let out_cell = chip.assign(
|
||||
layouter.namespace(|| "entire table"),
|
||||
10,
|
||||
)?;
|
||||
|
||||
|
||||
chip.expose_public(layouter.namespace(|| "out"), out_cell, 2)?;
|
||||
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
mod tests {
|
||||
use super::MyCircuit;
|
||||
use halo2_proofs::{pasta::Fp, circuit::Value, dev::MockProver};
|
||||
|
||||
#[test]
|
||||
fn test_example2() {
|
||||
let k = 4;
|
||||
|
||||
let a = Fp::from(1); // F[0]
|
||||
let b = Fp::from(1); // F[1]
|
||||
let out = Fp::from(55); // F[9]
|
||||
|
||||
let circuit = MyCircuit {
|
||||
a: Some(a),
|
||||
b: Some(b),
|
||||
};
|
||||
|
||||
let mut public_input = vec![a, b, out];
|
||||
|
||||
let prover = MockProver::run(k, &circuit, vec![public_input.clone()]).unwrap();
|
||||
prover.assert_satisfied();
|
||||
|
||||
public_input[2] += Fp::one();
|
||||
let prover = MockProver::run(k, &circuit, vec![public_input]).unwrap();
|
||||
// uncomment the following line and the assert will fail
|
||||
// prover.assert_satisfied();
|
||||
}
|
||||
|
||||
#[cfg(feature = "dev-graph")]
|
||||
#[test]
|
||||
fn plot_fibo2() {
|
||||
use plotters::prelude::*;
|
||||
let root = BitMapBackend::new("fib-2-layout.png", (1024, 3096)).into_drawing_area();
|
||||
root.fill(&WHITE).unwrap();
|
||||
let root = root.titled("Fib 2 Layout", ("sans-serif", 60)).unwrap();
|
||||
|
||||
let circuit = MyCircuit::<Fp> { a: None, b: None };
|
||||
halo2_proofs::dev::CircuitLayout::default()
|
||||
.render(4, &circuit, &root)
|
||||
.unwrap();
|
||||
}
|
||||
}
|
||||
132
src/example3.rs
Normal file
132
src/example3.rs
Normal file
@@ -0,0 +1,132 @@
|
||||
use halo2_proofs::{
|
||||
arithmetic::FieldExt,
|
||||
circuit::{AssignedCell, Layouter, SimpleFloorPlanner, Value},
|
||||
dev::MockProver,
|
||||
pasta::Fp,
|
||||
plonk::{Advice, Circuit, Column, ConstraintSystem, Error, Expression, Selector},
|
||||
poly::Rotation,
|
||||
};
|
||||
use crate::is_zero::{IsZeroChip, IsZeroConfig};
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
struct FunctionConfig<F: FieldExt> {
|
||||
selector: Selector,
|
||||
a: Column<Advice>,
|
||||
b: Column<Advice>,
|
||||
c: Column<Advice>,
|
||||
a_equals_b: IsZeroConfig<F>,
|
||||
output: Column<Advice>,
|
||||
}
|
||||
|
||||
struct FunctionChip<F: FieldExt> {
|
||||
config: FunctionConfig<F>,
|
||||
}
|
||||
|
||||
impl<F: FieldExt> FunctionChip<F> {
|
||||
pub fn construct(config: FunctionConfig<F>) -> Self {
|
||||
Self { config }
|
||||
}
|
||||
|
||||
pub fn configure(meta: &mut ConstraintSystem<F>) -> FunctionConfig<F> {
|
||||
let selector = meta.selector();
|
||||
let a = meta.advice_column();
|
||||
let b = meta.advice_column();
|
||||
let c = meta.advice_column();
|
||||
let output = meta.advice_column();
|
||||
|
||||
let is_zero_advice_column = meta.advice_column();
|
||||
let a_equals_b = IsZeroChip::configure(
|
||||
meta,
|
||||
|meta| meta.query_selector(selector),
|
||||
|meta| meta.query_advice(a, Rotation::cur()) - meta.query_advice(b, Rotation::cur()),
|
||||
is_zero_advice_column,
|
||||
);
|
||||
|
||||
meta.create_gate("f(a, b, c) = if a == b {c} else {a - b}", |meta| {
|
||||
let s = meta.query_selector(selector);
|
||||
let a = meta.query_advice(a, Rotation::cur());
|
||||
let b = meta.query_advice(b, Rotation::cur());
|
||||
let c = meta.query_advice(c, Rotation::cur());
|
||||
let output = meta.query_advice(output, Rotation::cur());
|
||||
vec![
|
||||
s.clone() * (a_equals_b.expr() * (output.clone() - c)),
|
||||
s * (Expression::Constant(F::one()) - a_equals_b.expr()) * (output - (a - b)),
|
||||
]
|
||||
});
|
||||
|
||||
FunctionConfig {
|
||||
selector,
|
||||
a,
|
||||
b,
|
||||
c,
|
||||
a_equals_b,
|
||||
output,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn assign(
|
||||
&self,
|
||||
mut layouter: impl Layouter<F>,
|
||||
a: F,
|
||||
b: F,
|
||||
c: F,
|
||||
) -> Result<AssignedCell<F, F>, Error> {
|
||||
let is_zero_chip = IsZeroChip::construct(self.config.a_equals_b.clone());
|
||||
|
||||
layouter.assign_region(
|
||||
|| "f(a, b, c) = if a == b {c} else {a - b}",
|
||||
|mut region| {
|
||||
self.config.selector.enable(&mut region, 0)?;
|
||||
region.assign_advice(|| "a", self.config.a, 0, || Value::known(a))?;
|
||||
region.assign_advice(|| "b", self.config.b, 0, || Value::known(b))?;
|
||||
region.assign_advice(|| "c", self.config.c, 0, || Value::known(c))?;
|
||||
is_zero_chip.assign(&mut region, 0, Value::known(a - b))?;
|
||||
|
||||
let output = if a == b { c } else { a - b };
|
||||
region.assign_advice(|| "output", self.config.output, 0, || Value::known(output))
|
||||
},
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Default)]
|
||||
struct FunctionCircuit<F> {
|
||||
a: F,
|
||||
b: F,
|
||||
c: F,
|
||||
}
|
||||
|
||||
impl<F: FieldExt> Circuit<F> for FunctionCircuit<F> {
|
||||
type Config = FunctionConfig<F>;
|
||||
type FloorPlanner = SimpleFloorPlanner;
|
||||
|
||||
fn without_witnesses(&self) -> Self {
|
||||
Self::default()
|
||||
}
|
||||
|
||||
fn configure(meta: &mut ConstraintSystem<F>) -> Self::Config {
|
||||
FunctionChip::configure(meta)
|
||||
}
|
||||
|
||||
fn synthesize(&self, config: Self::Config, layouter: impl Layouter<F>) -> Result<(), Error> {
|
||||
let chip = FunctionChip::construct(config);
|
||||
chip.assign(layouter, self.a, self.b, self.c)?;
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
mod tests {
|
||||
use super::*;
|
||||
|
||||
#[test]
|
||||
fn test_example3() {
|
||||
let circuit = FunctionCircuit {
|
||||
a: Fp::from(10),
|
||||
b: Fp::from(12),
|
||||
c: Fp::from(15),
|
||||
};
|
||||
|
||||
let prover = MockProver::run(4, &circuit, vec![]).unwrap();
|
||||
prover.assert_satisfied();
|
||||
}
|
||||
}
|
||||
75
src/is_zero.rs
Normal file
75
src/is_zero.rs
Normal file
@@ -0,0 +1,75 @@
|
||||
use halo2_proofs::{
|
||||
arithmetic::FieldExt,
|
||||
circuit::*,
|
||||
plonk::*,
|
||||
poly::Rotation,
|
||||
};
|
||||
|
||||
#[derive(Clone, Debug)]
|
||||
pub struct IsZeroConfig<F> {
|
||||
pub value_inv: Column<Advice>,
|
||||
pub is_zero_expr: Expression<F>,
|
||||
}
|
||||
|
||||
impl<F: FieldExt> IsZeroConfig<F> {
|
||||
pub fn expr(&self) -> Expression<F> {
|
||||
self.is_zero_expr.clone()
|
||||
}
|
||||
}
|
||||
|
||||
pub struct IsZeroChip<F: FieldExt> {
|
||||
config: IsZeroConfig<F>,
|
||||
}
|
||||
|
||||
impl<F:FieldExt> IsZeroChip<F> {
|
||||
pub fn construct(config: IsZeroConfig<F>) -> Self {
|
||||
IsZeroChip { config }
|
||||
}
|
||||
|
||||
pub fn configure(
|
||||
meta: &mut ConstraintSystem<F>,
|
||||
q_enable: impl FnOnce(&mut VirtualCells<'_, F>) -> Expression<F>,
|
||||
value: impl FnOnce(&mut VirtualCells<'_, F>) -> Expression<F>,
|
||||
value_inv: Column<Advice>,
|
||||
) -> IsZeroConfig<F> {
|
||||
let mut is_zero_expr = Expression::Constant(F::zero());
|
||||
|
||||
meta.create_gate("is_zero", |meta| {
|
||||
//
|
||||
// valid | value | value_inv | 1 - value * value_inv | value * (1 - value* value_inv)
|
||||
// ------+-------+------------+------------------------+-------------------------------
|
||||
// yes | x | 1/x | 0 | 0
|
||||
// no | x | 0 | 1 | x
|
||||
// yes | 0 | 0 | 1 | 0
|
||||
// yes | 0 | y | 1 | 0
|
||||
//
|
||||
let value = value(meta);
|
||||
let q_enable = q_enable(meta);
|
||||
let value_inv = meta.query_advice(value_inv, Rotation::cur());
|
||||
|
||||
is_zero_expr = Expression::Constant(F::one()) - value.clone() * value_inv.clone();
|
||||
vec![q_enable * value * is_zero_expr.clone()]
|
||||
});
|
||||
|
||||
IsZeroConfig {
|
||||
value_inv,
|
||||
is_zero_expr,
|
||||
}
|
||||
}
|
||||
|
||||
pub fn assign(
|
||||
&self,
|
||||
region: &mut Region<'_, F>,
|
||||
offset: usize,
|
||||
value: Value<F>,
|
||||
) -> Result<(), Error> {
|
||||
let value_inv = value.map(|value| value.invert().unwrap_or(F::zero()));
|
||||
region.assign_advice(
|
||||
|| "value inv",
|
||||
self.config.value_inv,
|
||||
offset,
|
||||
|| value_inv,
|
||||
)?;
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
4
src/lib.rs
Normal file
4
src/lib.rs
Normal file
@@ -0,0 +1,4 @@
|
||||
mod example1;
|
||||
mod example2;
|
||||
mod example3;
|
||||
mod is_zero;
|
||||
Reference in New Issue
Block a user