[Bug c++/34235] short variable cast to unsigned int fails to right shift as unsigned

[rguenth at gcc dot gnu dot org]

------- Comment #6 from rguenth at gcc dot gnu dot org  2008-01-25 23:12 -------
              /* If arg is sign-extended and then unsigned-shifted,
                 we can simulate this with a signed shift in arg's type
                 only if the extended result is at least twice as wide
                 as the arg.  Otherwise, the shift could use up all the
                 ones made by sign-extension and bring in zeros.
                 We can't optimize that case at all, but in most machines
                 it never happens because available widths are 2**N.  */

err - WHAT?!


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34235