[Bug lto/68549] New: [6 Regression] ICE: in verify_loop_structure, at cfgloop.c:1669

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68549

            Bug ID: 68549
           Summary: [6 Regression] ICE: in verify_loop_structure, at
                    cfgloop.c:1669
           Product: gcc
           Version: lto
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: lto
          Assignee: unassigned at gcc dot gnu.org
          Reporter: trippels at gcc dot gnu.org
                CC: hubicka at ucw dot cz
  Target Milestone: ---

During final Firefox libxul LTO link:
...
/home/trippels/gecko-dev/layout/generic/nsFrame.cpp: In member function
‘_ZN8nsIFrame10PeekOffsetEP18nsPeekOffsetStruct.part.253.constprop’:
/home/trippels/gecko-dev/layout/generic/nsFrame.cpp:6332:0: error: loop 17’s
latch is missing
 nsIFrame::PeekOffset(nsPeekOffsetStruct* aPos)


/home/trippels/gecko-dev/layout/generic/nsFrame.cpp:6332:0: internal compiler
error: in verify_loop_structure, at cfgloop.c:1669
0x1020444b verify_loop_structure()
        ../../gcc/gcc/cfgloop.c:1669
0x10507417 checking_verify_loop_structure
        ../../gcc/gcc/cfgloop.h:325
0x10507417 loop_optimizer_init(unsigned int)
        ../../gcc/gcc/loop-init.c:106
0x108fb3d3 execute
        ../../gcc/gcc/tree-ssa-pre.c:4777
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
make: *** [/home/trippels/tmp/ccuTrM43.ltrans34.ltrans.o] Error 1

Reducing...