[Bug tree-optimization/18501] [4.7/4.8/4.9 Regression] Missing 'used uninitialized' warning (CCP)

["manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18501

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |ppluzhnikov at google dot
                   |                            |com

--- Comment #61 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2013-04-15 18:46:59 UTC ---
*** Bug 56972 has been marked as a duplicate of this bug. ***
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Subject: [Bug c/56972] Missing "may be used uninitialized" warning for "obvious" uninitialized
Date: Mon, 15 Apr 2013 18:47:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56972

Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |RESOLVED
                 CC|                            |manu at gcc dot gnu.org
         Resolution|                            |DUPLICATE

--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> 2013-04-15 18:46:59 UTC ---
Infamous PR18501. With:

~/test1/197214/build/gcc/cc1 -Wall -Wextra -O1 pr56972.c -fdump-tree-all-lineno

you can see that pr56972.c.020t.copyrename1 contains the uninit use but
pr56972.c.021t.ccp1 has removed it.

*** This bug has been marked as a duplicate of bug 18501 ***
>From gcc-bugs-return-420352-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Apr 15 19:37:33 2013
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Subject: [Bug rtl-optimization/56921] [4.9 Regression] ICE in rtx_cost called by doloop_optimize_loops for PPC
Date: Mon, 15 Apr 2013 19:37:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?idV921

--- Comment #13 from Pat Haugen <pthaugen at gcc dot gnu.org> 2013-04-15 19:37:27 UTC ---
(In reply to comment #12)
> (In reply to comment #11)
> > Created attachment 29877 [details]
> > patch papering over the issue with TODO_do_not_ggc_collect
> >
> > Patch papering over (restoring non-GC collect) attached.  Not exactly the
> > best solution as garbage is then again not collected during the in some
> > cases memory expensive passes.
>
> Fixes ICE while building libgfortran for arm-*-*.
> Also, no regressions on arm-none-eabi tested with qemu.

This also fixes the testsuite failures and numerous spec build failures on
powerpc.