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Re: [tree-ssa] Avoid nondeterminism in tree-ssanames
On Wed, 2003-12-03 at 13:39, Gerald Pfeifer wrote:
> On Mon, 1 Dec 2003, Jan Hubicka wrote:
> > It makes 11% performance difference on Gerald's testcase on my setup,
> > just FYI.
>
> If I read this correctly...
>
> On Mon, 1 Dec 2003, Diego Novillo wrote:
> > Unless it's a huge win, I would *really* want to go back to the previous
> > scheme of having unique SSA numbers across the whole compilation unit.
>
> ...you might be able to convince Diego. :-)
>
> 11% on PR8361 is quite impressive an improvement!
I'd want to know where that 11% came from, it sounds like one (or more)
of the optimizations are doing something pretty inefficient and ought to
be looked at first. Just reducing the number of SSA_NAME ought not have
that significant an effect if everyone is being reasonably intelligent
about how they do things.
Its definately worth investigating.
Andrew