[Bug target/50762] New: ICE: in extract_insn, at recog.c:2137 (unrecognizable insn) with -mavx2 and __builtin_shuffle

[zsojka at seznam dot cz]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50762

             Bug #: 50762
           Summary: ICE: in extract_insn, at recog.c:2137 (unrecognizable
                    insn) with -mavx2 and __builtin_shuffle
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: zsojka@seznam.cz
              Host: x86_64-pc-linux-gnu
            Target: x86_64-pc-linux-gnu


Created attachment 25526
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25526
reduced testcase

Compiler output:
$ gcc -mavx2 testcase.c 
testcase.c: In function 'foo':
testcase.c:11:1: error: unrecognizable insn:
(insn 17 16 18 3 (set (reg:V4DF 62 [ v.3 ])
        (unspec:V4DF [
                (reg:V8SI 65)
                (reg:V8SI 66)
                (reg:V4DF 62 [ v.3 ])
            ] UNSPEC_BLENDV)) testcase.c:10 -1
     (nil))
testcase.c:11:1: internal compiler error: in extract_insn, at recog.c:2137
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r180072 - crash
4.6 - doesn't recognise -mavx2