Created attachment 34322 [details]
reduced testcase

Compiler output:
$ gcc -O2 -ftree-vectorize -ffloat-store -mavx512er testcase.c
testcase.c: In function 'foo':
testcase.c:12:1: error: unrecognizable insn:
 }
 ^
(insn 43 42 44 4 (set (reg:V8SF 121)
        (vec_select:V8SF (mem/c:V16SF (plus:DI (reg/f:DI 82 virtual-stack-vars)
                    (const_int -128 [0xffffffffffffff80])) [1 vect__10.6+0 S64 A512])
            (parallel [
                    (const_int 8 [0x8])
                    (const_int 9 [0x9])
                    (const_int 10 [0xa])
                    (const_int 11 [0xb])
                    (const_int 12 [0xc])
                    (const_int 13 [0xd])
                    (const_int 14 [0xe])
                    (const_int 15 [0xf])
                ]))) testcase.c:9 -1
     (nil))
testcase.c:12:1: internal compiler error: in extract_insn, at recog.c:2327
0xbd9d78 _fatal_insn(char const*, rtx_def const*, char const*, int, char const*)
        /mnt/svn/gcc-trunk/gcc/rtl-error.c:110
0xbd9e08 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /mnt/svn/gcc-trunk/gcc/rtl-error.c:118
0xb903b8 extract_insn(rtx_insn*)
        /mnt/svn/gcc-trunk/gcc/recog.c:2327
0x96eecd instantiate_virtual_regs_in_insn
        /mnt/svn/gcc-trunk/gcc/function.c:1582
0x96eecd instantiate_virtual_regs
        /mnt/svn/gcc-trunk/gcc/function.c:1950
0x96eecd execute
        /mnt/svn/gcc-trunk/gcc/function.c:1999
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

Tested revisions:
r219043 - ICE
4_9 r219040 - OK