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[Bug tree-optimization/26830] [4.1/4.2 Regression] Insane amount of compile-time / memory needed at -O1 and above
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 24 Mar 2006 16:33:03 -0000
- Subject: [Bug tree-optimization/26830] [4.1/4.2 Regression] Insane amount of compile-time / memory needed at -O1 and above
- References: <bug-26830-10053@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #17 from rguenth at gcc dot gnu dot org 2006-03-24 16:33 -------
Now compare numbers from 4.0.3 (i686 again):
tree PHI insertion : 6.50 (12%) usr 0.06 ( 2%) sys 6.99 (11%) wall
tree SSA rewrite : 8.25 (15%) usr 0.02 ( 1%) sys 8.75 (14%) wall
tree SSA other : 3.18 ( 6%) usr 0.20 ( 6%) sys 5.07 ( 8%) wall
dominator optimization: 8.73 (16%) usr 0.06 ( 2%) sys 8.87 (14%) wall
global alloc : 4.58 ( 8%) usr 0.27 ( 9%) sys 5.28 ( 8%) wall
TOTAL : 53.96 3.08 63.37
the usual and expected offender, DOM. But you can also imagine the big PHIs
there.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26830