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7 Commits

Author SHA1 Message Date
Jack Grigg cb819e47e9 Migrate to `ff` revision without `FieldExt` 2022-11-30 19:35:26 +00:00
Jack Grigg 49b2324f0a Replace unnecessary dependencies on `FieldExt` trait 2022-11-30 03:41:19 +00:00
Jack Grigg 7d15fa3db5 sha256: Simplify single-constraint gates 
`Option<T>` implements `IntoIterator<Item = T>`, so we don't need to
wrap it in an explicit iterator.
 2022-04-27 20:12:03 +00:00
Jack Grigg e3f1bf68db halo2_gadgets: Remove usage of `array::IntoIter::new` 
Rust 2021 implements `IntoIterator` for arrays directly, instead of only
references to arrays.

    https://doc.rust-lang.org/edition-guide/rust-2021/IntoIterator-for-arrays.html
 2022-04-27 12:56:54 +00:00
Jack Grigg 78de8a5c94 Add a `Constraints` helper 
There are two existing patterns for constructing a gate from a set of
constraints with a common selector:

- Create an iterator of constraints, where each constraint includes the
  selector:
  ```
  vec![
      ("foo", selector.clone() * foo),
      ("bar", selector.clone() * bar),
      ("baz", selector * bar),
  ]
  ```
  This requires the user to write O(n) `selector.clone()` calls.

- Create an iterator of constraints, and then map the selector in:
  ```
  vec![
      ("foo", foo),
      ("bar", bar),
      ("baz", bar),
  ].into_iter().map(move |(name, poly)| (name, selector.clone() * poly))
  ```
  This looks cleaner overall, but the API is not as intuitive, and it
  is messier when the constraints are named.

The `Constraints` struct provides a third, clearer API:
```
Constraints::with_selector(
    selector,
    vec![
        ("foo", foo),
        ("bar", bar),
        ("baz", bar),
    ],
)
```
This focuses on the structure of the constraints, and handles the
selector application for the user.
 2022-04-20 10:55:50 +00:00
Jack Grigg 9a12beee73 halo2_gadgets: Rename `halo2` to `halo2_proofs` 
The previous commit renamed `halo2_proofs` back to `halo2` temporarily
to keep the commit size down. This commit performs the rename in a
single pass.
 2022-01-27 23:32:04 +00:00
Jack Grigg 5202ec6eda Integrate `halo2_gadgets` into the workspace 
THe SHA-256 example gadget has been moved into the `halo2_gadgets` crate
behind an `unstable` feature flag.
 2022-01-27 23:32:04 +00:00