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[Bug rtl-optimization/55092] New: [4.8 Regression] LRA doesn't scale
- From: "hjl.tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 26 Oct 2012 21:54:11 +0000
- Subject: [Bug rtl-optimization/55092] New: [4.8 Regression] LRA doesn't scale
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55092
Bug #: 55092
Summary: [4.8 Regression] LRA doesn't scale
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: hjl.tools@gmail.com
CC: vmakarov@redhat.com
From
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54402#c4
-----
As Uros says in bug 54507, the reflect test from libgo is another example.
Without var tracking it takes 20s on my x86_64 box (tested with a 32-bit
compiler). With var tracking it takes 46m 40s.
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It only happens with -m32. It takes less than 20 seconds for
-m64 and -mx32. Turn-off LRA takes only 13 seconds to finish.