[Bug target/79807] New: ICE in extract_insn, at recog.c:2311 (error: unrecognizable insn)

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79807

            Bug ID: 79807
           Summary: ICE in extract_insn, at recog.c:2311 (error:
                    unrecognizable insn)
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: jakub at redhat dot com, kyukhin at gcc dot gnu.org
  Target Milestone: ---
            Target: x86_64-linux-gnu

Starting from r244263, we ICE:

$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/sse-22.c
-ffloat-store
In file included from
/home/marxin/bin/gcc3/lib64/gcc/x86_64-pc-linux-gnu/7.0.1/include/immintrin.h:41:0,
                 from
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/i386/sse-22.c:223:
/home/marxin/bin/gcc3/lib64/gcc/x86_64-pc-linux-gnu/7.0.1/include/avxintrin.h:
In function ‘_mm256_castpd256_pd128’:
/home/marxin/bin/gcc3/lib64/gcc/x86_64-pc-linux-gnu/7.0.1/include/avxintrin.h:1436:1:
error: unrecognizable insn:
 }
 ^
(insn 6 3 9 2 (set (mem:V2DF (plus:DI (reg/f:DI 82 virtual-stack-vars)
                (const_int -16 [0xfffffffffffffff0])) [11  S16 A128])
        (vec_select:V2DF (mem/c:V4DF (plus:DI (reg/f:DI 82 virtual-stack-vars)
                    (const_int -64 [0xffffffffffffffc0])) [11 __A+0 S32 A256])
            (parallel [
                    (const_int 0 [0])
                    (const_int 1 [0x1])
                ])))
"/home/marxin/bin/gcc3/lib64/gcc/x86_64-pc-linux-gnu/7.0.1/include/avxintrin.h":1435
-1
     (nil))
/home/marxin/bin/gcc3/lib64/gcc/x86_64-pc-linux-gnu/7.0.1/include/avxintrin.h:1436:1:
internal compiler error: in extract_insn, at recog.c:2311
0xb95868 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        ../../gcc/rtl-error.c:108
0xb95899 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        ../../gcc/rtl-error.c:116
0xb62e81 extract_insn(rtx_insn*)
        ../../gcc/recog.c:2311
0x92d5e3 instantiate_virtual_regs_in_insn
        ../../gcc/function.c:1589
0x92d5e3 instantiate_virtual_regs
        ../../gcc/function.c:1957
0x92d5e3 execute
        ../../gcc/function.c:2006

Similar to what was reported in PR79568.