MP_INT_SIZEOF_DIGITS() macro, and use it for stack allocations in DECL_SP_INT() and DECL_SP_INT_ARRAY(); refactor _sp_submod() to use DECL_SP_INT() rather than DECL_SP_INT_ARRAY() to work around apparent optimizer bug in gcc-15.
MP_INT_SIZEOF_DIGITS() macro, and use it for stack allocations in DECL_SP_INT() and DECL_SP_INT_ARRAY(); refactor _sp_submod() to use DECL_SP_INT() rather than DECL_SP_INT_ARRAY() to work around apparent optimizer bug in gcc-15.