[Bug rtl-optimization/54269] New: [4.8 Regression] memory usage too large when optimizing

[Joost.VandeVondele at mat dot ethz.ch]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54269

             Bug #: 54269
           Summary: [4.8 Regression] memory usage too large when
                    optimizing
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: Joost.VandeVondele@mat.ethz.ch


Created attachment 28019
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=28019
gzipped testcase.

The attached testcase requires +- 10Gb resident memory to compile with:

gfortran -c -O3 -funroll-all-loops -march=native -ffree-form -D__LIBINT
hfx_contraction_methods.F

using current trunk. I believe this is a recent regression in trunk. 4.7 needs
500Mb. From a very quick gdb session, I guess this is some rtl thing.