PATCH RFA: PR 29286: Handle placement new aliasing issues

[Michael Matz]

Hi,

On Mon, 11 Jun 2007, Ian Lance Taylor wrote:

> Michael Matz <matz@suse.de> writes:
> 
> > > But Richard's proposed rules will hurt optimization in some cases. They 
> > > didn't hurt his particular test case.
> > 
> > Well, his testcase actually was SPEC2000, polyhedron and a couple of heavy 
> > and not so heavy C++ programs.
> 
> Fair enough, but really the particular test case was the x86_64
> processor, which is aggressively out-of-order and relatively immune to
> instruction scheduling issues.

He tested on ia64 not x86-64, specifically because that one is sensitive 
to scheduling.  See comment 154.


Ciao,
Michael.