gcc 3.3 -O3 produces bad code

[Wolfgang Bangerth]

Your code is wrong, you are violating aliasing rules. Use 
-fno-strict-aliasing, or read up in the manual why the code is wrong.

W.

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