Compile-time and execution-time impact of CSE - some numbers

[Paolo Bonzini]

> The second step would be to
> make cse.c use the CFG (ie. FOR_BB_INSNS/BB_HEAD/BB_ END/etc.) instead
> of relying on block notes.

Block notes are the lesser problem.  It's using barriers and labels to detect 
edge types, that would drive me nuts :-)

> Next you'd clean up the path following code
> to track back only to the last visited block before following a jump.

Is it different from a very low --param max-cse-path-length?

Paolo

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