[Bug tree-optimization/47615] New: [4.6 Regression] ICE: too deep recursion in phi_translate/phi_translate_1 with -ftree-pre -fno-tree-fre -fno-tree-sra

["zsojka at seznam dot cz" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47615

           Summary: [4.6 Regression] ICE: too deep recursion in
                    phi_translate/phi_translate_1 with -ftree-pre
                    -fno-tree-fre -fno-tree-sra
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 23250
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=23250
auto-reduced testcase

Compiler output:
$ gcc -O -fstrict-aliasing -ftree-pre -fno-tree-fre -fno-tree-sra testcase.C
gcc: internal compiler error: Segmentation fault (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

(gdb) bt
#0  0x00007ffff643711c in _int_malloc () from /lib/libc.so.6
#1  0x00007ffff64399d0 in malloc () from /lib/libc.so.6
#2  0x00000000011f9c40 in xrealloc (oldmem=<value optimized out>, size=152) at
/mnt/svn/gcc-trunk/libiberty/xmalloc.c:177
#3  0x0000000000bea372 in vec_heap_o_reserve_1 (vec=0x0, reserve=<value
optimized out>, vec_offset=<value optimized out>, 
    elt_size=<value optimized out>, exact=<value optimized out>) at
/mnt/svn/gcc-trunk/gcc/vec.c:321
#4  0x0000000000b1b800 in VEC_vn_reference_op_s_heap_copy (expr=0x197b120,
set1=0x197e0c8, set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-sccvn.h:86
#5  phi_translate_1 (expr=0x197b120, set1=0x197e0c8, set2=0x0,
pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1623
#6  0x0000000000b1bc8c in phi_translate (expr=0x197b120, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1858
#7  phi_translate (expr=0x197b120, set1=0x197e0c8, set2=0x0,
pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1835
#8  0x0000000000b1b8e9 in phi_translate_1 (expr=0x197c030, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1570
#9  0x0000000000b1bc8c in phi_translate (expr=0x197c030, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1858
#10 phi_translate (expr=0x197c030, set1=0x197e0c8, set2=0x0,
pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1835
#11 0x0000000000b1b8e9 in phi_translate_1 (expr=0x197b120, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1570
#12 0x0000000000b1bc8c in phi_translate (expr=0x197b120, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1858
#13 phi_translate (expr=0x197b120, set1=0x197e0c8, set2=0x0,
pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1835
#14 0x0000000000b1b8e9 in phi_translate_1 (expr=0x197c030, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1570
#15 0x0000000000b1bc8c in phi_translate (expr=0x197c030, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1858
#16 phi_translate (expr=0x197c030, set1=0x197e0c8, set2=0x0,
pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1835
#17 0x0000000000b1b8e9 in phi_translate_1 (expr=0x197b120, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1570
#18 0x0000000000b1bc8c in phi_translate (expr=0x197b120, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1858
#19 phi_translate (expr=0x197b120, set1=0x197e0c8, set2=0x0,
pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1835
#20 0x0000000000b1b8e9 in phi_translate_1 (expr=0x197c030, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1570
#21 0x0000000000b1bc8c in phi_translate (expr=0x197c030, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1858
#22 phi_translate (expr=0x197c030, set1=0x197e0c8, set2=0x0,
pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1835
#23 0x0000000000b1b8e9 in phi_translate_1 (expr=0x197b120, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)
    at /mnt/svn/gcc-trunk/gcc/tree-ssa-pre.c:1570
#24 0x0000000000b1bc8c in phi_translate (expr=0x197b120, set1=0x197e0c8,
set2=0x0, pred=0x7ffff5a484e0, phiblock=0x7ffff5a48548)

Tested revisions:
r169824 - crash
4.5.2 - OK