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flate.Compress: simplify huffman node comparisons

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Instead of comparing each field, nodes are now compared as 32-bit
values where `freq` is in the most significant bits.
This commit is contained in:
Kendall Condon 2025-11-11 16:14:39 -05:00 committed by Andrew Kelley
parent d6931b0ff5
commit 8284da2f3d
1 changed files with 4 additions and 3 deletions
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7
lib/std/compress/flate/Compress.zig
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@ -993,14 +993,15 @@ const huffman = struct {
const max_leafs = 286;
const max_nodes = max_leafs * 2;
const Node = struct {
freq: u16,
const Node = packed struct(u32) {
depth: u16,
freq: u16,
pub const Index = u16;
/// `freq` is more significant than `depth`
pub fn smaller(a: Node, b: Node) bool {
return if (a.freq != b.freq) a.freq < b.freq else a.depth < b.depth;
return @as(u32, @bitCast(a)) < @as(u32, @bitCast(b));
}
};