[pypy-dev] Re: [pypy-svn] r13583 - in pypy/dist/pypy/translator/llvm2: . test

[holger krekel]

Hi Armin, 

On Sun, Jun 19, 2005 at 12:20 +0200, Armin Rigo wrote:
> On Sat, Jun 18, 2005 at 06:28:30PM +0200, cfbolz at codespeak.net wrote:
> > - added flow graph transform remove_same_as, because same_as is
> >   incompatible with SSA in LLVM.
> 
> I'm not sure I see why 'same_as' is incompatible with LLVM?  It's not an
> "assignment" operation, it's just an operation that creates a new result
> variable just like all the other ones.  The optimization is nice,
> though.

Basically LLVM does not support a generic 

    x1 = x2 
  
and we couldn't think of a way to tweak some equivalent. 
Previously, Carl used e.g. 'x1 = add int 0, x2' but we 
thought we just want to get rid of the problem. 

    holger