Zig 0.17.0-dev (Split by item)

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clenHlen

Compress.clenHlen

fn clenHlen(freqs: [19]u16) u4

File

lib/std/compress/flate/Compress.zig:739

Code

fn clenHlen(freqs: [19]u16) u4 {
    // Note that the first four codes (16, 17, 18, and 0) are always present.
    if (builtin.mode != .small and (std.simd.suggestVectorLength(u16) orelse 1) >= 8) {
        const V = @Vector(16, u16);
        const hlen_mul: V = comptime m: {
            var hlen_mul: [16]u16 = undefined;
            for (token.codegen_order[3..], 0..) |i, hlen| {
                hlen_mul[i] = hlen;
            }
            break :m hlen_mul;
        };
        const encoded = freqs[0..16].* != @as(V, @splat(0));
        return @intCast(@reduce(.Max, @intFromBool(encoded) * hlen_mul));
    } else {
        var max: u4 = 0;
        for (token.codegen_order[4..], 1..) |i, len| {
            max = if (freqs[i] == 0) max else @intCast(len);
        }
        return max;
    }
}