[Bug middle-end/33970] Missed optimization using unsigned char loop variable

[henning dot m at insightbb dot com]

------- Comment #9 from henning dot m at insightbb dot com  2007-11-06 12:37 -------
(In reply to comment #8)
> (In reply to comment #7)
> > With Mike's description in comment #6, confirmed on 4.1.2 and 4.2.2. AVR GCC
> > 4.2.2 is worse than 4.1.2, in that even if sub2 is called with (x+1), the
> > variable is still 16 bits.
> > 
> 
> There is something more going on, this is the assembler output when sub2 is not
> in the same file, and calling sub2(x), i.e not x+1:
> ===================================================================

I think you will also find that if x is changed from ststic to auto the same
problem appears.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33970