[Bug rtl-optimization/55092] New: [4.8 Regression] LRA doesn't scale

[hjl.tools at gmail dot com]

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

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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.