Re: [PATCH, middle-end]: Backport "[PATCH] Avoid useless bitfield extractions" to 4.3 branch

[Uros Bizjak <ubizjak at gmail dot com>]

Eric Botcazou wrote:
> > Eric's patch [1] fixes:
> >
> > FAIL: g++.dg/torture/pr35526.C  -O1  (internal compiler error)
> > FAIL: g++.dg/torture/pr35526.C  -O1  (test for excess errors)
> > FAIL: g++.dg/torture/pr35526.C  -O2  (internal compiler error)
> > FAIL: g++.dg/torture/pr35526.C  -O2  (test for excess errors)
> > FAIL: g++.dg/torture/pr35526.C  -O3 -fomit-frame-pointer  (internal
> > compiler error) FAIL: g++.dg/torture/pr35526.C  -O3 -fomit-frame-pointer 
> > (test for excess errors) FAIL: g++.dg/torture/pr35526.C  -O3 -g  (internal
> > compiler error)
> > FAIL: g++.dg/torture/pr35526.C  -O3 -g  (test for excess errors)
> > FAIL: g++.dg/torture/pr35526.C  -Os  (internal compiler error)
> > FAIL: g++.dg/torture/pr35526.C  -Os  (test for excess errors)
> >
> > for alpha-unknown-linux-gnu on 4.3 branch.
> >
> > 2008-12-01  Uros Bizjak  <ubizjak@gmail.com>
> >
> >     Backport from mainline:
> >     2008-06-12  Eric Botcazou  <ebotcazou@adacore.com>
> >
> >     * expr.c (store_field): Do a block copy from BLKmode to BLKmode-like.
> >     (get_inner_reference): Use BLKmode for byte-aligned BLKmode bitfields.
> >     
>
> FWIW we have been using it for one year in 4.1- and 4.3-based compilers.  You 
> probably just need the first hunk though.
>   

I have committed the complete patch under the assumption that having 
also the second hunk doesn't hurt.

Thanks,
Uros.