[Bug c/79688] New: ICE with a RTL test-case and -O1 provided

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79688

            Bug ID: 79688
           Summary: ICE with a RTL test-case and -O1 provided
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: dmalcolm at gcc dot gnu.org
  Target Milestone: ---

I know it's kind of nasty to provide an optimization option, but maybe worth
mentioning:

$ gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/rtl/x86_64/pro_and_epilogue.c
-O1
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/rtl/x86_64/pro_and_epilogue.c:
In function ‘test_1’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/rtl/x86_64/pro_and_epilogue.c:103:1:
internal compiler error: in df_scan_verify, at df-scan.c:4267
 }
 ^
0x84bab6 df_scan_verify()
        ../../gcc/df-scan.c:4266
0x837cd4 df_verify()
        ../../gcc/df-core.c:1831
0x837cd4 df_analyze_1
        ../../gcc/df-core.c:1217
0x138da1a rest_of_handle_dse
        ../../gcc/dse.c:3418
0x138da1a execute
        ../../gcc/dse.c:3519