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[Bug c++/17278] [4.0 Regression] 24% C++ compile-time regression in comparison with 3.4.1 at -O1 optimization level
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 4 Dec 2004 17:54:47 -0000
- Subject: [Bug c++/17278] [4.0 Regression] 24% C++ compile-time regression in comparison with 3.4.1 at -O1 optimization level
- References: <20040902085559.17278.kgardas@objectsecurity.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2004-12-04 17:54 -------
tree remove redundant PHIs: 0.34 ( 2%) usr 0.02 ( 0%) sys 0.34 ( 1%) wall
tree SSA rewrite : 0.42 ( 3%) usr 0.06 ( 1%) sys 0.62 ( 3%) wall
tree SSA other : 0.88 ( 6%) usr 0.61 ( 9%) sys 1.39 ( 6%) wall
tree operand scan : 0.45 ( 3%) usr 0.64 (10%) sys 1.51 ( 6%) wall
dominator optimization: 0.86 ( 6%) usr 0.05 ( 1%) sys 0.83 ( 3%) wall
tree alias analysis : 0.19 ( 1%) usr 0.01 ( 0%) sys 0.25 ( 1%) wall
tree PHI insertion : 0.23 ( 2%) usr 0.02 ( 0%) sys 0.24 ( 1%) wall
expand : 0.72 ( 5%) usr 0.08 ( 1%) sys 0.91 ( 4%) wall
I wounder how expand is this slow, it might be just again counting more than just expand here (again).
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17278