Add a helper for multi-limb 64-bit addition. The helper emits native
carry-chain TCG ops when they are available and falls back to explicit
carry propagation otherwise.
This lets target translators build wider integer accumulators inline
without open-coding the same add-with-carry sequence at each use site.
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: James Hilliard <james.hilliard1@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-Id: <20260520172313.23777-17-philmd@linaro.org>
8bbb1a1807