[Bug target/94494] gcc-10 unrecognizable insn

[abrahm.scully at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94494

--- Comment #2 from Abrahm Scully <abrahm.scully at gmail dot com> ---
Created attachment 48255
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48255&action=edit
preprocessed source file

With gcc-10-20200329, "g++ -Wall -ftree-vectorize -march=pentium3 -O2 -m32 -c
illegal-insn.cpp.ii -o illegal-insn.cpp.o" prints the following:

illegal-insn.cpp: In function 'void illegal_insn(float*, float*, float*, int,
int, int, int, int)':
illegal-insn.cpp:16:1: error: unrecognizable insn:
   16 | }
      | ^
(insn 80 79 81 13 (set (reg:V1TI 144)
        (lshiftrt:V1TI (subreg:V1TI (reg:V4SI 113 [ vect_found_18.20 ]) 0)
            (const_int 64 [0x40]))) -1
     (nil))
during RTL pass: vregs
illegal-insn.cpp:16:1: internal compiler error: in extract_insn, at
recog.c:2294
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