Zig 0.17.0-dev (Split by item)

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readVbr

BitcodeReader.readVbr

fn readVbr(bc: *BitcodeReader, comptime T: type, bits: u7) !T

File

lib/std/zig/llvm/BitcodeReader.zig:415

Code

fn readVbr(bc: *BitcodeReader, comptime T: type, bits: u7) !T {
    const chunk_bits: u6 = @intCast(bits - 1);
    const chunk_msb = @as(u64, 1) << chunk_bits;

    var result: u64 = 0;
    var shift: u6 = 0;
    while (true) {
        const chunk = try bc.readFixed(u64, bits);
        result |= (chunk & (chunk_msb - 1)) << shift;
        if (chunk & chunk_msb == 0) break;
        shift += chunk_bits;
    }
    return @intCast(result);
}