* merkle: add parent() helper function on NodeIndex
* smt: add pairs_to_leaf() to trait
* smt: add sorted_pairs_to_leaves() and test for it
* smt: implement single subtree-8 hashing, w/ benchmarks & tests
This will be composed into depth-8-subtree-based computation of entire
sparse Merkle trees.
* merkle: add a benchmark for constructing 256-balanced trees
This is intended for comparison with the benchmarks from the previous
commit. This benchmark represents the theoretical perfect-efficiency
performance we could possibly (but impractically) get for computing
depth-8 sparse Merkle subtrees.
* smt: test that SparseMerkleTree::build_subtree() is composable
* smt: test that subtree logic can correctly construct an entire tree
This commit ensures that `SparseMerkleTree::build_subtree()` can
correctly compose into building an entire sparse Merkle tree, without
yet getting into potential complications concurrency introduces.
* smt: implement test for basic parallelized subtree computation w/ rayon
Building on the previous commit, this commit implements a test proving
that `SparseMerkleTree::build_subtree()` can be composed into itself not
just concurrently, but in parallel, without issue.
* smt: add from_raw_parts() to trait interface
This commit adds a new required method to the SparseMerkleTree trait,
to allow generic construction from pre-computed parts.
This will be used to add a generic version of `with_entries()` in a
later commit.
* smt: add parallel constructors to Smt and SimpleSmt
What the previous few commits have been leading up to: SparseMerkleTree
now has a function to construct the tree from existing data in parallel.
This is significantly faster than the singlethreaded equivalent.
Benchmarks incoming!
---------
Co-authored-by: krushimir <krushimir@reilabs.co>
Co-authored-by: krushimir <kresimir.grofelnik@reilabs.io>
