Re: CFG

[Marcio de Oliveira Buss <ra990898 at ic dot unicamp dot br>]

	Thus, is there an answer for this question?
	"what is the compilation point where I could take the most
 optimized CFG for a function to build another structure based on that
 CFG?" And which is the file representing this point.

	Thanks.


On Wed, 28 Jun 2000, Jeffrey A Law wrote:

>   >         Could you please help me? I want to know if the CFG
>   >  constructed in the dataflow analysis is updated at each step
>   >  subsequent steps of the compilation, and, in turn, remains until
>   >  the Final phase of the compilation process. I want to transform
>   >  the CFG into another structure but only after all the optimizations
>   >  have been made over it. I know that the almost all optimizations
>   >  are made over the RTL expressions, but I don't know if some
>   >  optimization touchs the CFG. 
>   >         In other words, I would like to know if the CFG is
>   >  destructed after the dataflow analysis, i.e., after the
>   >  informations provided by the CFG are recorded for futures uses, or
>   >  if the CFG remains untouchable.

> Most of the time we [re]build the cfg when we need it (ie, we don't assume
> it's valid, except in a few special cases).  Most of the optimizers are
> not using the cfg right now and do not keep it accurate.
> jeff