bug found in gcc 3.2

[Wolfgang Bangerth]

Alan,
this is not a bug in gcc. You are playing type games with pointers of type 
long* to long long variables. The language standard prohibits this [1]. If 
you absolutely have to do things like that, either use -fno-strict-aliasing 
(which makes the program behave in the way you want), or use the 
suggestions mentioned in the manual (look for "aliasing"). The manual 
lists a number of ways to modify code to make it standard conforming.

Regards
  Wolfgang

[1] In short: the standard says that variables must only be accessed
through pointers to their exact type (up to some exceptions for char*).  
All other pointer operations are assume not to change the value of that
variable -- which in your case tricks the compiler into exchanging
statements it thinks are independent, and possibly optimizing them away at
all.

-------------------------------------------------------------------------
Wolfgang Bangerth              email:            bangerth@ices.utexas.edu
                               www: http://www.ices.utexas.edu/~bangerth/