[Bug rtl-optimization/48757] New: internal compiler error: in compensate_edge, at reg-stack.c:2788

[chilikin.k at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48757

           Summary: internal compiler error: in compensate_edge, at
                    reg-stack.c:2788
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: chilikin.k@gmail.com


Created attachment 24093
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=24093
fconc64.f (from CERNLIB / MATHLIB, simplified)

Version of compiler: 4.6.0
The same problem exists in version 4.5.2

System type and configuration of the compiler:
Target: i686-pc-linux-gnu
Configured with: ./configure --prefix=/opt/gcc-4.6.0/
Thread model: posix

Triggering the bug (fconc64.f is attached file):
gfortran -c -O2 fconc64.f
The bug does not occur without optimization flag -O2

Compiler output:
fconc64.f:18.72:

      ASSIGN 1 TO JP                                                    
                                                                        1
Warning: Deleted feature: ASSIGN statement at (1)
fconc64.f:20.72:

    1 ASSIGN 2 TO JP                                                    
                                                                        1
Warning: Deleted feature: ASSIGN statement at (1)
fconc64.f:24.72:

   12 ASSIGN 3 TO JP                                                    
                                                                        1
Warning: Deleted feature: ASSIGN statement at (1)
fconc64.f:28.72:

   13 ASSIGN 4 TO JP                                                    
                                                                        1
Warning: Deleted feature: ASSIGN statement at (1)
fconc64.f:36.38:

       IF(ABS(R-RR) .LT. EPS) GO TO JP, (1,2,3,4)                       
                                      1
Warning: Deleted feature: Assigned GOTO statement at (1)
fconc64.f:43.38:

       IF(ABS(R-RR) .LT. EPS) GO TO JP, (1,2,3,4)                       
                                      1
Warning: Deleted feature: Assigned GOTO statement at (1)
fconc64.f: In function 'dfconc':
fconc64.f:52:0: internal compiler error: in compensate_edge, at
reg-stack.c:2788
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.