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Re: [tree-ssa] do not produce useless copies


> On Sat, 22 Nov 2003, Jan Hubicka wrote:
> > this patch avoid copying of inline functions that are not inlined.  For
> > some reason it saves one failure on x86-64, makes no difference on i686.
> > Must be unrelated bug.
> > 
> > It makes considerable difference on -O3 compilation (20% on Gerald's
> > testcase).
>  
> PR8361?  20% in memory use or compile-time?
I've tested some of files from your application,  but it should match
the testcase.

The reduction happens in amount of memory allocated by GGC.  Peak memory
usage remains more or less unchanged.  I didn't tested compilation time,
but the copying don't show top in the profiling so it is unlikely it
will have very large effect.

There are still improvements possible, I will work on this later (it is
possible to reorder the compilation queue in a way so we avoid all
copies in non-recusive graphs)
> 
> Would this also be applicable to mainline? We do need anything we can
> get to improve compile time there as well for GCC 3.4!
No, we don't do any copying there, it happens only for branch.

Honza
>   
> Gerald


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