cmpxchg

fn cmpxchg(
    gz: *GenZir,
    scope: *Scope,
    ri: ResultInfo,
    node: Ast.Node.Index,
    params: []const Ast.Node.Index,
    small: u16,
) InnerError!Zir.Inst.Ref {
    const int_type = try typeExpr(gz, scope, params[0]);
    const atomic_order_type = try gz.addStdLangValue(node, .atomic_order);
    const result = try gz.addExtendedPayloadSmall(.cmpxchg, small, Zir.Inst.Cmpxchg{
        // zig fmt: off
        .node           = gz.nodeIndexToRelative(node),
        .ptr            = try expr(gz, scope, .{ .rl = .none },                                params[1]),
        .expected_value = try expr(gz, scope, .{ .rl = .{ .ty = int_type } },                  params[2]),
        .new_value      = try expr(gz, scope, .{ .rl = .{ .coerced_ty = int_type } },          params[3]),
        .success_order  = try expr(gz, scope, .{ .rl = .{ .coerced_ty = atomic_order_type } }, params[4]),
        .failure_order  = try expr(gz, scope, .{ .rl = .{ .coerced_ty = atomic_order_type } }, params[5]),
        // zig fmt: on
    });
    return rvalue(gz, ri, result, node);
}