fix(hamt): shrink root pointer by 8 bytes
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parent
052dd57cdd
commit
8e89cc5f4f
13
src/trie.zig
13
src/trie.zig
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@ -18,7 +18,7 @@ pub fn HashArrayMappedTrie(comptime K: type, comptime V: type, comptime Context:
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const t: Log2Int(Digest) = @intCast(@typeInfo(Log2Int(Digest)).Int.bits);
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free_list: FreeList,
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root: []?*Node,
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root: *[table_size]?*Node,
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const Node = union(enum) { kv: Pair, table: Table };
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const Table = struct { map: Digest = 0, base: [*]Node };
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@ -146,7 +146,7 @@ pub fn HashArrayMappedTrie(comptime K: type, comptime V: type, comptime Context:
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pub fn init(allocator: Allocator) !Self {
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// TODO: Add ability to have a larger root node (for quicker lookup times)
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const root = try allocator.alloc(?*Node, table_size);
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const root = try allocator.create([table_size]?*Node);
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@memset(root, null);
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return Self{ .root = root, .free_list = try FreeList.init(allocator) };
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@ -198,13 +198,12 @@ pub fn HashArrayMappedTrie(comptime K: type, comptime V: type, comptime Context:
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switch (current.*) {
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.table => |table| {
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const mask = @as(Digest, 1) << tableIdx(hash, hash_offset);
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if (table.map & mask == 0) return null; // empty table
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if (table.map & mask != 0) {
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const idx = @popCount(table.map & (mask - 1));
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current = &table.base[idx];
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const idx = @popCount(table.map & (mask - 1));
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current = &table.base[idx];
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hash_offset += t;
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} else return null; // hash table entry is empty
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hash_offset += t;
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},
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.kv => |pair| {
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if (!Context.eql(pair.key, key)) return null;
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