[Bug middle-end/5169] paradoxical subreg problem

law at redhat dot com gcc-bugzilla@gcc.gnu.org
Mon Feb 21 21:32:00 GMT 2005


------- Additional Comments From law at redhat dot com  2005-02-21 14:14 -------
Subject: Re:  paradoxical subreg problem

On Sun, 2005-02-20 at 00:34 +0000, jsm28 at gcc dot gnu dot org wrote:
> ------- Additional Comments From jsm28 at gcc dot gnu dot org  2005-02-20 00:34 -------
> The testcase no longer exhibits the bug, so this PR seems to represent
> some underlying problem with compiler internals rather than any longer
> being concerned with the failure of a particular testcase.
> 
> Jeff Law had a patch at <http://gcc.gnu.org/ml/gcc/2002-01/msg01872.html>.
> The discussion doesn't indicate anything in particular wrong with it,
> was there some reason it wasn't applied?
I don't think we ever came to a solid decision about which approach
was better.  My patch was simpler, but there may have been other
cases that Alan's patch handled that mine didn't.

I do think we all agreed that (subreg (mem)) was evil :-)

I think the fact that unrelated changes masked all these issues and
as a result this has been largely ignored for the last few years.

jeff



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=5169



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