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[Bug middle-end/54114] New: variable-tracking performance regression from 4.8-20120610 to 4.8-20120701
- From: "jimis at gmx dot net" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Sat, 28 Jul 2012 17:22:16 +0000
- Subject: [Bug middle-end/54114] New: variable-tracking performance regression from 4.8-20120610 to 4.8-20120701
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54114
Bug #: 54114
Summary: variable-tracking performance regression from
4.8-20120610 to 4.8-20120701
Classification: Unclassified
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: middle-end
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: jimis@gmx.net
Compiling the XPath.cpp from xalanc shows significant performance regression
because of variable tracking, between GCC 4.8-20120610 to 4.8-20120701.
Tracking it down is hard since var-tracking.c changed a lot in the past month,
CC'ing lxo for better ideas. :-)
It seems to apply mostly to C++ code, see the graph and the last annotation at
http://teras-ics.mooo.com:8003/