OpenEuphoria

They are rare, but I've seen a couple of places where this bites, for instance libcurl.e has this:

 
    if xcurl_easy_setopt=NULL then 
        xcurl_easy_setopt = define_c_func(libcurl, "curl_easy_setopt", {C_PTR, C_INT, C_PTR}, C_INT) 
        if machine_bits()=32 then -- split a curl_off_t (64 bit int) into two 32-bit ints 
            xcurl_easy_setopt2 = define_c_func(libcurl, "curl_easy_setopt", {C_PTR, C_INT, C_PTR, C_PTR}, C_INT) 
        end if 
    end if 
    ... 
    if machine_bits()=32 and option>30000 then 
        atom paramhi = floor(param/#1_0000_0000) 
        param = remainder(param,#1_0000_0000) 
        res = c_func(xcurl_easy_setopt2, {curl, option, param, paramhi}) 
    else 
        res = c_func(xcurl_easy_setopt, {curl, option, param}) 
    end if 

It may be that you need to ram two floats into a 64-bit value the hard way, ie faff about with poke(atom_to_float32()) and peek8(), on 64-bit.