[Bug tree-optimization/47555] [4.4/4.6 Regression] Huge memory usage when optimizing

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47555

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
      Known to work|                            |4.3.4, 4.5.1
           Keywords|                            |compile-time-hog,
                   |                            |memory-hog
   Last reconfirmed|                            |2011.02.01 11:29:35
                 CC|                            |rguenth at gcc dot gnu.org,
                   |                            |spop at gcc dot gnu.org
     Ever Confirmed|0                           |1
            Summary|Huge memory usage when      |[4.4/4.6 Regression] Huge
                   |optimizing                  |memory usage when
                   |                            |optimizing
   Target Milestone|---                         |4.4.6
      Known to fail|                            |4.4.5, 4.6.0

--- Comment #1 from Richard Guenther <rguenth at gcc dot gnu.org> 2011-02-01 
11:29:35 UTC ---
GCC 4.5 uses around 800MB, most of the compile-time is spent in SCEV ccp,
IVOPTs and VRP - which all hints at SCEV being the culprit.  GCC 4.6
tops over 3GB which kills my machine, so does 4.4.  4.3, similar to 4.5
tops at around 1GB.