[Bug middle-end/38868] [4.4 Regression] r143152 breaks output routines in xplor-nih

[rguenth at gcc dot gnu dot org]

------- Comment #35 from rguenth at gcc dot gnu dot org  2009-01-19 10:29 -------
I can reproduce the issue with the testcase in comment #27 on x86_64-linux
with -m32 -O2 vs. -m32 -O.

It can be reduced to the effect of -fschedule-insns2 and -fforward-propagate
(disabling either on -O2 -fno-strict-aliasing is enough to fix the failure,
enabling both is enough to trigger the failure with -O).

I didn't track down which asm difference makes it fail, but there are some
changes across calls which look dubious.  CCing Paolo and Steven ...


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |stevenb dot gcc at gmail dot
                   |                            |com, bonzini at gnu dot org
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|0                           |1
           Keywords|                            |wrong-code
   Last reconfirmed|0000-00-00 00:00:00         |2009-01-19 10:29:50
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38868