[Bug tree-optimization/39799] [4.3/4.4/4.5 Regression] missing 'may be used uninitialized' warning

[rguenth at gcc dot gnu dot org]

--- Comment #4 from rguenth at gcc dot gnu dot org  2009-08-04 12:30 ---
GCC 4.3.4 is being released, adjusting target milestone.


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rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

   Target Milestone|4.3.4   |4.3.5


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39799

[Bug tree-optimization/39799] [4.3/4.4/4.5 Regression] missing 'may be used uninitialized' warning

[rguenth at gcc dot gnu dot org]

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rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

   Priority|P3  |P2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39799

[Bug tree-optimization/39799] [4.3/4.4/4.5 Regression] missing 'may be used uninitialized' warning

[rguenth at gcc dot gnu dot org]

--- Comment #3 from rguenth at gcc dot gnu dot org  2009-04-20 09:32 ---
Honza, if overlapping lifetimes are the problem instead of zero-initializing
uninitialized params we could instead create a new uninitialized variable for
them?


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39799

[Bug tree-optimization/39799] [4.3/4.4/4.5 Regression] missing 'may be used uninitialized' warning

[jakub at gcc dot gnu dot org]

--- Comment #2 from jakub at gcc dot gnu dot org  2009-04-20 07:39 ---
See PR31081 for details.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39799

[Bug tree-optimization/39799] [4.3/4.4/4.5 Regression] missing 'may be used uninitialized' warning

[rguenth at gcc dot gnu dot org]

--- Comment #1 from rguenth at gcc dot gnu dot org  2009-04-17 20:55 ---
This is because we zero-initialize uninitialized variables during inlining.
Honza, do you remember why we do this?

  /* By inlining function having uninitialized variable, we might
 extend the lifetime (variable might get reused).  This cause
 ICE in the case we end up extending lifetime of SSA name across
 abnormal edge, but also increase register pressure.

 We simply initialize all uninitialized vars by 0 except
 for case we are inlining to very first BB.  We can avoid
 this for all BBs that are not inside strongly connected
 regions of the CFG, but this is expensive to test.  */


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rguenth at gcc dot gnu dot org changed:

   What|Removed |Added

 CC||hubicka at gcc dot gnu dot
   ||org
 Status|UNCONFIRMED |NEW
  Component|regression  |tree-optimization
 Ever Confirmed|0   |1
   Keywords||diagnostic
   Last reconfirmed|-00-00 00:00:00 |2009-04-17 20:55:52
   date||
Summary|missing 'may be used|[4.3/4.4/4.5 Regression]
   |uninitialized' warning  |missing 'may be used
   ||uninitialized' warning
   Target Milestone|--- |4.3.4


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39799