[Bug c/56113] New: out of memory when compiling a function with many goto labels (50k > )

["aixer77 at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56113

             Bug #: 56113
           Summary: out of memory when compiling a function with many goto
                    labels (50k > )
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: aixer77@gmail.com


Out of memory when compiling a function with many goto labels (50k > )

gcc 4.6.3 compiler(running on top of ubuntu 12.04 32-bit) failed to output an
object for a function when it comes with extremely large number of goto
labels.

Attached is a simple script that generates the test source file. Here's how to
reproduce a failure with the script.

~$./goto_gen.py 60000 t.c

~$ time cc -O1 -o t t.c

cc1: out of memory allocating 4064 bytes after a total of 2309808128 bytes

real    11m44.371s
user    11m42.592s
sys    0m1.876s

~$ time cc -O0 -o t t.c

real    22m5.106s
user    22m3.539s
sys    0m1.640s


As you can see from the above, -O1 option trigger the problem while -O0
doesn't.

Could you anyone tell me how to workaround this situation? Or which specific
optimization option causes the issue?

Thanks a lot for your help in advance.

Regards, Kangkook