[Bug rtl-optimization/78400] New: [7 Regression] ICE: in df_refs_verify, at df-scan.c:4045 when building powerpc crosscompiler

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78400

            Bug ID: 78400
           Summary: [7 Regression] ICE: in df_refs_verify, at
                    df-scan.c:4045 when building powerpc crosscompiler
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zsojka at seznam dot cz
  Target Milestone: ---
              Host: x86_64-pc-linux-gnu
            Target: powerpc-unknown-linux-gnu
             Build: x86_64-pc-linux-gnu

Created attachment 40072
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40072&action=edit
reduced testcase

Compiler output:
$ $
/repo/build-trunk-242552-checking-yes-rtl-df-extra-nographite-powerpc/./gcc/cc1
-quiet -O2 testcase.c
testcase.c: In function 'foo':
testcase.c:7:1: internal compiler error: in df_refs_verify, at df-scan.c:4045
 }
 ^
0x7924a2 df_refs_verify
        /repo/gcc-trunk/gcc/df-scan.c:4045
0x797f30 df_insn_refs_verify
        /repo/gcc-trunk/gcc/df-scan.c:4125
0x79a272 df_bb_verify
        /repo/gcc-trunk/gcc/df-scan.c:4154
0x79a597 df_scan_verify()
        /repo/gcc-trunk/gcc/df-scan.c:4286
0x782e78 df_verify()
        /repo/gcc-trunk/gcc/df-core.c:1831
0x782efa df_analyze_1
        /repo/gcc-trunk/gcc/df-core.c:1217
0xb8d304 try_shrink_wrapping_separate(basic_block_def*)
        /repo/gcc-trunk/gcc/shrink-wrap.c:1694
0x8b0d7f thread_prologue_and_epilogue_insns()
        /repo/gcc-trunk/gcc/function.c:5960
0x8b1572 rest_of_handle_thread_prologue_and_epilogue
        /repo/gcc-trunk/gcc/function.c:6419
0x8b1572 execute
        /repo/gcc-trunk/gcc/function.c:6461
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.

$
/repo/build-trunk-242552-checking-yes-rtl-df-extra-nographite-powerpc/./gcc/xgcc
-v
Using built-in specs.
COLLECT_GCC=/repo/build-trunk-242552-checking-yes-rtl-df-extra-nographite-powerpc/./gcc/xgcc
Target: powerpc-unknown-linux-gnu
Configured with: /repo/gcc-trunk//configure --enable-languages=c,c++
--enable-valgrind-annotations --disable-nls --enable-checking=yes,rtl,df,extra
--without-cloog --without-ppl --without-isl
--with-sysroot=/usr/powerpc-unknown-linux-gnu
--target=powerpc-unknown-linux-gnu --build=x86_64-pc-linux-gnu
--host=x86_64-pc-linux-gnu --target=powerpc-unknown-linux-gnu
--with-ld=/usr/bin/powerpc-unknown-linux-gnu-ld
--with-as=/usr/bin/powerpc-unknown-linux-gnu-as --disable-libstdcxx-pch
--prefix=/repo/gcc-trunk//binary-trunk-242552-checking-yes-rtl-df-extra-nographite-powerpc
Thread model: posix
gcc version 7.0.0 20161117 (experimental) (GCC) 


The compiler was configured with --enable-checking=yes,rtl,df,extra ; maybe df
checking is needed to reproduce.