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compressParentsParallel

blake3.compressParentsParallel

fn compressParentsParallel(child_chaining_values: []const u8, num_chaining_values: usize, key: [8]u32, flags: Flags, out: []u8) usize

File

lib/std/crypto/blake3.zig:609

Code

fn compressParentsParallel(child_chaining_values: []const u8, num_chaining_values: usize, key: [8]u32, flags: Flags, out: []u8) usize {
    var parents_array: [max_simd_degree_or_2][*]const u8 = undefined;
    var parents_array_len: usize = 0;

    while (num_chaining_values - (2 * parents_array_len) >= 2) {
        parents_array[parents_array_len] = child_chaining_values[2 * parents_array_len * Blake3.digest_length ..].ptr;
        parents_array_len += 1;
    }

    hashMany(parents_array[0..parents_array_len], parents_array_len, 1, key, 0, false, flags.with(.{ .parent = true }), .{}, .{}, out);

    if (num_chaining_values > 2 * parents_array_len) {
        @memcpy(out[parents_array_len * Blake3.digest_length ..][0..Blake3.digest_length], child_chaining_values[2 * parents_array_len * Blake3.digest_length ..][0..Blake3.digest_length]);
        return parents_array_len + 1;
    } else {
        return parents_array_len;
    }
}