u8g_sub          3658 ext/uvector/uvector.c                 r = u8g_sub(v0, v1, clamp);
u8g_sub          3673 ext/uvector/uvector.c                 r = u8g_sub(v0, v1, clamp);
u8g_sub          3687 ext/uvector/uvector.c                 r = u8g_sub(v0, v1, clamp);