[Bug middle-end/50609] New: [4.7 Regression] FAIL: gcc.c-torture/execute/pr23135.c compilation, -O2 -flto (ICE)

["hp at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50609

             Bug #: 50609
           Summary: [4.7 Regression] FAIL: gcc.c-torture/execute/pr23135.c
                    compilation,  -O2 -flto (ICE)
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: hp@gcc.gnu.org
                CC: artyom.shinkaroff@gmail.com, hjl.tools@gmail.com,
                    hp@gcc.gnu.org
        Depends on: 50607


+++ This bug was initially created as a clone of Bug #50607 +++

See PR50607#c1.

The SEGV happens in lto1. Here's a gdb backtrace (N.B. optimized code on a
x86_64 host) running lto1 with "-melf -quiet -dumpdir
/tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/testsuite/gcc/ -dumpbase pr23135.x6
-auxbase-strip /tmp/ccSn7Zx5.lto.o -O2 -w -version -flto-partition=none
-fresolution=pr23135.res pr23135.o -o pr23135.s":

(gdb) r                                       
The program being debugged has been started already.
Start it from the beginning? (y or n) y

Starting program: /tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/lto1 -melf -quiet
-dumpdir /tmp/hpautotest-gcc1/cris-elf/gccobj/gcc/testsuite/gcc/ -dumpbase
pr23135.x6 -auxbase-strip /tmp/ccSn7Zx5.lto.o -O2 -w -version
-flto-partition=none -fresolution=pr23135.res pr23135.o -o pr23135.s
GNU GIMPLE (GCC) version 4.7.0 20111003 (experimental) [trunk revision 179480]
(cris-elf)
        compiled by GNU C version 4.4.3 20100127 (Red Hat 4.4.3-4), GMP version
4.3.0, MPFR version 2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
GNU GIMPLE (GCC) version 4.7.0 20111003 (experimental) [trunk revision 179480]
(cris-elf)
        compiled by GNU C version 4.4.3 20100127 (Red Hat 4.4.3-4), GMP version
4.3.0, MPFR version 2.4.1, MPC version 0.8
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096

Program received signal SIGSEGV, Segmentation fault.
fold_nonarray_ctor_reference (type=<value optimized out>, ctor=<value optimized
out>, offset=<value optimized out>, 
    size=32) at /tmp/hpautotest-gcc1/gcc/gcc/gimple-fold.c:2834
2834          tree byte_offset = DECL_FIELD_OFFSET (cfield);
(gdb) bt
#0  fold_nonarray_ctor_reference (type=<value optimized out>, ctor=<value
optimized out>, 
    offset=<value optimized out>, size=32) at
/tmp/hpautotest-gcc1/gcc/gcc/gimple-fold.c:2834
#1  fold_ctor_reference (type=<value optimized out>, ctor=<value optimized
out>, offset=<value optimized out>, size=32)
    at /tmp/hpautotest-gcc1/gcc/gcc/gimple-fold.c:2923
#2  0x000000000062225c in fold_const_aggregate_ref_1 (t=0x7ffff7f7ca10,
valueize=0)
    at /tmp/hpautotest-gcc1/gcc/gcc/gimple-fold.c:3017
#3  0x0000000000627c10 in maybe_fold_reference (expr=0x7ffff7f7ca10, is_lhs=0
'\000')
    at /tmp/hpautotest-gcc1/gcc/gcc/gimple-fold.c:232
#4  0x00000000006292c1 in fold_stmt_1 (gsi=0x7fffffffdb00, inplace=0 '\000')
    at /tmp/hpautotest-gcc1/gcc/gcc/gimple-fold.c:1168
#5  0x0000000000833b1a in optimize_stmt (bb=0x7ffff7f85478, si=...) at
/tmp/hpautotest-gcc1/gcc/gcc/tree-ssa-dom.c:2133
#6  0x00000000008347ad in dom_opt_enter_block (walk_data=<value optimized out>,
bb=0x7ffff7f85478)
    at /tmp/hpautotest-gcc1/gcc/gcc/tree-ssa-dom.c:1686
#7  0x00000000009d7228 in walk_dominator_tree (walk_data=0x7fffffffdc50,
bb=0x7ffff7f85478)
    at /tmp/hpautotest-gcc1/gcc/gcc/domwalk.c:188
#8  0x000000000082ed7d in tree_ssa_dominator_optimize () at
/tmp/hpautotest-gcc1/gcc/gcc/tree-ssa-dom.c:709
#9  0x00000000006f5f82 in execute_one_pass (pass=0xee6160) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:2064
#10 0x00000000006f6295 in execute_pass_list (pass=0xee6160) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:2119
#11 0x00000000006f62a7 in execute_pass_list (pass=0xe606e0) at
/tmp/hpautotest-gcc1/gcc/gcc/passes.c:2120
#12 0x00000000007d92f8 in tree_rest_of_compilation (fndecl=0x7ffff7f74800)
    at /tmp/hpautotest-gcc1/gcc/gcc/tree-optimize.c:420
#13 0x00000000004e836e in cgraph_expand_function (node=0x7ffff7f7f120)
    at /tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1805
#14 0x00000000004eb72a in cgraph_expand_all_functions () at
/tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:1864
#15 cgraph_optimize () at /tmp/hpautotest-gcc1/gcc/gcc/cgraphunit.c:2141
#16 0x0000000000475344 in lto_main () at
/tmp/hpautotest-gcc1/gcc/gcc/lto/lto.c:2868
#17 0x00000000007776a1 in compile_file () at
/tmp/hpautotest-gcc1/gcc/gcc/toplev.c:565
#18 do_compile () at /tmp/hpautotest-gcc1/gcc/gcc/toplev.c:1925
#19 0x0000000000778212 in toplev_main (argc=17, argv=0x7fffffffe008) at
/tmp/hpautotest-gcc1/gcc/gcc/toplev.c:2001
#20 0x00000037d421eb1d in __libc_start_main () from /lib64/libc.so.6
#21 0x0000000000459959 in _start ()

I'll re-run that with all *.o rebuilt with "-O0 -g3".