[Bug c/15850] extra load with volatilable variables

[schwab at suse dot de]

------- Additional Comments From schwab at suse dot de  2004-06-15 22:17 -------
The standard says in 6.5.16#3: "... An assignment expression has the value of 
the left operand _after_ the assignment, ..." (emphasis mine).  A volatile 
variable can change its value any time, so the compiler must reload the value 
before it can be used further. 

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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=15850