[Bug tree-optimization/57144] New: [4.9 regression] mpfr miscompiled after r198413

[Bug tree-optimization/57144] New: [4.9 regression] mpfr miscompiled after r198413

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57144

             Bug #: 57144
           Summary: [4.9 regression] mpfr miscompiled after r198413
    Classification: Unclassified
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Keywords: build
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: schwab@linux-m68k.org
                CC: law@gcc.gnu.org
        Depends on: 57124
            Target: ia64-*-*


r198413 is causing miscompilation of mpfr-2.4.2 on ia64, seen by a lot of
failures in its testsuite, some are looping infinitely.  This makes it
impossible to bootstrap with an in-tree mpfr, because the fortran compiler
hangs while calling mpfr_log10 from gfc_arith_init_1.

The patch in <http://permalink.gmane.org/gmane.comp.gcc.patches/285076> does
not help.

[Bug tree-optimization/57144] [4.9 regression] mpfr miscompiled after r198413

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57144

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|---                         |4.9.0

[Bug tree-optimization/57144] [4.9 regression] mpfr miscompiled after r198413

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57144

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |law at redhat dot com

--- Comment #1 from Jeffrey A. Law <law at redhat dot com> 2013-05-02 16:28:40 UTC ---
Thanks.   I can trigger a 2.4.2 testsuite failure on x86_64.  Investigating.

[Bug tree-optimization/57144] [4.9 regression] mpfr miscompiled after r198413

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57144

Jeffrey A. Law <law at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
   Last reconfirmed|                            |2013-05-02
         AssignedTo|unassigned at gcc dot       |law at redhat dot com
                   |gnu.org                     |
     Ever Confirmed|0                           |1

--- Comment #2 from Jeffrey A. Law <law at redhat dot com> 2013-05-02 17:03:03 UTC ---
It looks like more overflow issues, though slightly different than 57124.  In
the case I looked at in the mpfr code we overflow converting a constant to the
desired type.  It's all downhill from there.

[Bug tree-optimization/57144] [4.9 regression] mpfr miscompiled after r198413

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57144

--- Comment #3 from Jeffrey A. Law <law at redhat dot com> 2013-05-03 16:37:34 UTC ---
I've checked in a patch to the trunk which should fix this problem.  If you
could verify on ia64 it would be greatly appreciated.

[Bug tree-optimization/57144] [4.9 regression] mpfr miscompiled after r198413

[schwab@linux-m68k.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57144

Andreas Schwab <schwab@linux-m68k.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Andreas Schwab <schwab@linux-m68k.org> 2013-05-04 11:20:08 UTC ---
Works.

http://gcc.gnu.org/ml/gcc-testresults/2013-05/msg00274.html

[Bug tree-optimization/57144] [4.9 regression] mpfr miscompiled after r198413

[law at redhat dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57144

Bug 57144 depends on bug 57124, which changed state.

Bug 57124 Summary: 254.gap@spec2000 got miscompare after r198413
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57124

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |FIXED