What happens with gcc -O6 ?

[Dr. David Kirkby]

I've got some code where the author has used the compiler option -O6. What 
happens in a case like this? gcc does not issue any warnings, but as far as I'm 
aware, such a level of optimisation is not supported. So what would happen in a 
case like this? Would there be any optimiation, the maximum possible, the 
default ...?

dave
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