z_gy2gx
if (z_gy2gx(info, gy2gx_max) > _Z_GCAST(gx2gy_max))
info->z_startdrift = z_gy2gx(info, 1);
i = z_gy2gx(info, 1);
fprintf(stderr, "\tminreq=%d, ", z_gy2gx(info, 1));
"z_gy2gx()", (int32_t)z_gy2gx(info, 1));
"Max", (int32_t)gy2gx_max, (int32_t)z_gy2gx(info, gy2gx_max));
reqin = z_gy2gx(info, ocount) - z_fetched(info);
startdrift = z_gy2gx(info, 1);