scalarBits

    pub fn scalarBits(self: Type, builder: *const Builder) u24 {
        return switch (self) {
            .void, .label, .token, .metadata, .none, .x86_amx => unreachable,
            .i1 => 1,
            .i8 => 8,
            .half, .bfloat, .i16 => 16,
            .i29 => 29,
            .float, .i32 => 32,
            .double, .i64, .x86_mmx => 64,
            .x86_fp80, .i80 => 80,
            .fp128, .ppc_fp128, .i128 => 128,
            .ptr => @intCast(builder.data_layout.getPointerSpec(.default).bit_width),
            .@"ptr addrspace(4)" => @intCast(
                builder.data_layout.getPointerSpec(@fromBackingInt(@intCast(4))).bit_width,
            ),
            _ => {
                const item = builder.type_items.items[@backingInt(self)];
                return switch (item.tag) {
                    .simple,
                    .function,
                    .vararg_function,
                    => unreachable,
                    .integer => @intCast(item.data),
                    .pointer => @intCast(
                        builder.data_layout.getPointerSpec(@fromBackingInt(@intCast(item.data))).bit_width,
                    ),
                    .target => unreachable,
                    .vector,
                    .scalable_vector,
                    => builder.typeExtraData(Type.Vector, item.data).child.scalarBits(builder),
                    .small_array,
                    .array,
                    .structure,
                    .packed_structure,
                    .named_structure,
                    => unreachable,
                };
            },
        };
    }