[Bug c/46107] New: verify_loop_structure problem

[dcb314 at hotmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46107

           Summary: verify_loop_structure problem
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: dcb...@hotmail.com


Created attachment 22100
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22100
C source code

I just tried to compile package gambas2-2.21.0 with the latest 4.6
snapshot 20101016 on a Fedora Linux box. The compiler said

gbx_subr_math.c: In function 'SUBR_add_quick':
gbx_subr_math.c:295:6: error: edge from 7 to 9 should be marked irreducible
gbx_subr_math.c:295:6: internal compiler error: in verify_loop_structure, at
cfgloop.c:1562
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Source code attached. Flag -O3 required.