[tree-ssa] RFC: Making control flow more explicit

[Andrew MacLeod]

On Mon, 2003-08-11 at 15:23, Zdenek Dvorak wrote:
> Hello,
> 
> > PS.  Hmm now I think of it, how are those numbers possible?  Didn't
> > these patches break the loop optimizer???
> 
> yes, but I have found out recently that you have already broken it
> before me :-).  The code you currently produce makes the loops not to
> be recognized correctly by some of loop optimizations (loop header
> copying, unroller).
> 
> Still I am surprised by the numbers, IMHO it should not work that well.
> 

If all you are doing is allowing RTL to recognize loops and generate
decrement and branch or equivilent instructions, I think you'd be
suprised at the result.. it was on my short list of todo's to expand
LOOP_EXPR's because of just this.


Andrew