On Wed, Feb 18, 2009 at 06:03:58PM +0800, JCX wrote: > Hello, > After I compile the following file for testing, I check the dump > file called "129t.final_cleanup". I doubt about why the type "short > int" changes into "short unsigned int" during the array operations, > and at last changes back to "short int" when it stores the result into > memory. > [...] > I don't know why GCC do such a type conversion. Can anyone tell me? > This makes me more difficult to do the optimization in GCC.
Because GCC converts to short unsigned int to avoid arithmetic
