Deep CSE bug!

[Dave Korn]

> -----Original Message-----
> From: gcc-owner On Behalf Of Jie Zhang
> Sent: 18 June 2004 04:25
> To: Dave Korn
> Cc: gcc
> Subject: Re: Deep CSE bug!
> 
> Dave Korn wrote:
> > 
> >   Hmm.  I see that Jie Zhang had pretty much this exact 
> same problem over a
> > year ago, but I can't find any followups to this post:
> > 
> > http://gcc.gnu.org/ml/gcc/2003-04/msg01397.html
> > 
> 
> I just worked around it by defining the "movdi" pattern.
> 
> 
> -- 
> Jie

  Thankyou Jie, I guess I'll have to try that.

  Does really nobody have anything to say about the semantics of REQ_EQUAL
on SETs of SUBREGs?  The internals menu talks about the case where you have
a STRICT_LOW_PART of a SUBREG but doesn't say anything about the plain
SUBREG case.  I would have thought the mode of the expression in the note
ought to be the same as the mode of the SUBREG rather than the inner REG,
perhaps?


    cheers, 
      DaveK
-- 
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