[Bug c/26765] New: ICE in in extract_insn, at recog.c:2036

["raj dot khem at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

GCC trunk gets this ICE when building glibc. The ICE happens on gcc 4.1 too.
This happens when -O2 is turned on. Here is a reduced testcase to reproduce the
problem.

example.c
==================
__thread int *a = 0;

void foo (void)
{
  extern int *b;
  b = (int *) ((*a));
}


how to reproduce 

mips-elf-gcc -O2 -c example.c


example.c: In function 'foo':
example.c:7: error: unrecognizable insn:
(insn 14 13 15 3 (set (reg/f:SI 193)
        (mem/c/i:SI (lo_sum:SI (reg:SI 195)
                (const:SI (unspec:SI [
                            (symbol_ref:SI ("a") [flags 0x22] <var_decl
0xb7c4a840 a>)
                        ] 114))) [2 a+0 S4 A32])) -1 (nil)
    (nil))
example.c:7: internal compiler error: in extract_insn, at recog.c:2036
Please submit a full bug report,
with preprocessed source if appropriate.
See <URL:http://gcc.gnu.org/bugs.html> for instructions.


-- 
           Summary: ICE in in extract_insn, at recog.c:2036
           Product: gcc
           Version: 4.1.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: raj dot khem at gmail dot com
 GCC build triplet: i386-redhat-linux
  GCC host triplet: i386-redhat-linux
GCC target triplet: mips-unknown-elf


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26765