some tree-ssa vs mainline stats

[Steven Bosscher]

law@redhat.com wrote:

> >Total number # of insns in .00.rtl 
> >generate-3.4.ii SSA   417674
> >generate-3.4.ii HEAD  728202
> >combine.i       SSA    41528
> >combine.i       HEAD   35524
>I don't know if the reduction in insns for generate.ii is due to tree-ssa
>optimizing better or doing something like not inlining as well.  I tend to
>suspect the latter as most of the time it tends to produce more insns
>than without tree-ssa.
>  
>

Hmmm how would that be? The inlining heuristics are completely fixed by 
the front end (via DECL_NUM_STMTS), so inlining on the tree-ssa branch 
should be exactly the same as on mainline (The only difference is that 
inline candidates can now have optimized function trees). So maybe the 
tree-ssa optimizers help reduce the number of insns in this case.

Gr.
Steven