[Bug c/12826] Optimizer removes reference through volatile pointer

[bangerth at dealii dot org]

PLEASE REPLY TO gcc-bugzilla@gcc.gnu.org ONLY, *NOT* gcc-bugs@gcc.gnu.org.

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=12826


bangerth at dealii dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
         Resolution|                            |INVALID


------- Additional Comments From bangerth at dealii dot org  2003-10-29 16:16 -------
I agree with Falk. Of course, volatile char * is a pointer to 
a volatile char, but you are accessing a non-volatile object
through a pointer to a volatile char. That doesn't change the
non-volatility of the object and gcc should be free to optimize
away the access. If you want to retain the read in the loop,
declare the object as volatile.

W.