[Bug middle-end/38585] New: excessive time in compute_may_aliases

["jv244 at cam dot ac dot uk" <gcc-bugzilla at gcc dot gnu dot org>]

This is split off from PR38474 for clarity. Compiling the testcase of that PR 

(http://gcc.gnu.org/bugzilla/attachment.cgi?id=16873)

as

gfortran-4.3 -ffree-line-length-512 -g -ffree-form -ftime-report -c -O3
-march=native -funroll-loops -fno-rename-registers testcase.f90

shows that a slow routine at -O3 is related to compute_may_aliases, at the
point I interupted the profiling, this routine had called add_virtual_operand
200M
times.


-- 
           Summary: excessive time in compute_may_aliases
           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
OtherBugsDependingO 38474
             nThis:


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38585