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From: "zsojka at seznam dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/46051] New: [4.6 Regression] ICE: in extract_insn, at recog.c:2110 with -mavx -ftree-vectorize
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46051

           Summary: [4.6 Regression] ICE: in extract_insn, at recog.c:2110
                    with -mavx -ftree-vectorize
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz


Created attachment 22065
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=22065
reduced testcase

Compiler output:
$ gcc -O2 -mavx -ftree-vectorize pr46051.c          
pr46051.c: In function 'foo':
pr46051.c:15:1: error: unrecognizable insn:
(insn 41 40 42 3 (set (reg:V4DF 108)
        (vec_concat:V4DF (vec_select:V2DF (reg:V4DF 109)
                (parallel [
                        (const_int 0 [0])
                        (const_int 1 [0x1])
                    ]))
            (vec_select:V2DF (reg:V4DF 110)
                (parallel [
                        (const_int 0 [0])
                        (const_int 1 [0x1])
                    ])))) pr46051.c:13 -1
     (nil))
pr46051.c:15:1: internal compiler error: in extract_insn, at recog.c:2110
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested versions:
r165540 - crash
r163636 - OK