[Bug middle-end/38729] New: long time needed in tree canonical iv

[jv244 at cam dot ac dot uk]

The to-be-attached testcase takes about 10s to compile at '-O0 -fbounds-check',
30s at '-O2 -fbounds-check' while it requires about 300s at '-O1
-fbounds-check'

The time report shows that at -O1 about 80% of the time is in 'tree canonical
iv     : 244.29 (82%) usr'


-- 
           Summary: long time needed in tree canonical iv
           Product: gcc
           Version: 4.4.0
            Status: UNCONFIRMED
          Keywords: compile-time-hog
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jv244 at cam dot ac dot uk


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38729