[Bug tree-optimization/80618] [8 regression] test case gcc.dg/pr50310-2.c fails with ICE starting with 247544

["seurer at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80618

--- Comment #4 from seurer at gcc dot gnu.org ---
Yup, you were right.

Compiling with r247543:

seurer@genoa:~/gcc/build/gcc-test$ /home/seurer/gcc/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test/gcc/
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/pr50310-2.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -O3 -lm -o
./pr50310-2.exe


And adding  --param vect-max-peeling-for-alignment=0

seurer@genoa:~/gcc/build/gcc-test$ /home/seurer/gcc/build/gcc-test/gcc/xgcc
-B/home/seurer/gcc/build/gcc-test/gcc/
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/pr50310-2.c
-fno-diagnostics-show-caret -fdiagnostics-color=never -O3 -lm -o
./pr50310-2.exe --param vect-max-peeling-for-alignment=0
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/pr50310-2.c: In function 'main':
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/pr50310-2.c:47:1: error:
unrecognizable insn:
(insn 361 360 176 2 (set (reg:V2DF 342)
        (not:V2DF (ior:V2DF (reg:V2DF 470)
                (reg:V2DF 471))))
"/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/pr50310-2.c":30 -1
     (nil))
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.dg/pr50310-2.c:47:1: internal
compiler error: in extract_insn, at recog.c:2311
0x108ab353 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/seurer/gcc/gcc-test/gcc/rtl-error.c:108
0x108ab3b7 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/seurer/gcc/gcc-test/gcc/rtl-error.c:116
0x108701d7 extract_insn(rtx_insn*)
        /home/seurer/gcc/gcc-test/gcc/recog.c:2311
0x1120fe63 decompose_multiword_subregs
        /home/seurer/gcc/gcc-test/gcc/lower-subreg.c:1467
0x1121150b execute
        /home/seurer/gcc/gcc-test/gcc/lower-subreg.c:1734
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