[Bug c/107609] New: ice in extract_insn, at recog.cc:2791

["dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107609

            Bug ID: 107609
           Summary: ice in extract_insn, at recog.cc:2791
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

For C testsuite file ./gcc.target/i386/prefetchi-1.c, compiled
with recent gcc, does this:


$ ~/gcc/results/bin/gcc -c w ./gcc.target/i386/prefetchi-1.c
./gcc.target/i386/prefetchi-1.c: In function ‘foo1’:
./gcc.target/i386/prefetchi-1.c:19:1: error: unrecognizable insn:
   19 | }
      | ^
(insn 6 3 7 2 (unspec_volatile [
            (symbol_ref:DI ("bar") [flags 0x3] <function_decl 0x7f6856732800
bar>)
            (const_int 3 [0x3])
        ] UNSPECV_PREFETCHI) "./gcc.target/i386/prefetchi-1.c":17:3 -1
     (nil))
during RTL pass: vregs
./gcc.target/i386/prefetchi-1.c:19:1: internal compiler error: in extract_insn,
at recog.cc:2791

The bug first seems to occur sometime between git hash e3b10249119fb425
and 9aa1b63a5554563b.