[Bug target/83964] New: [8 Regression] ICE in extract_insn, at recog.c:2304

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83964

            Bug ID: 83964
           Summary: [8 Regression] ICE in extract_insn, at recog.c:2304
           Product: gcc
           Version: unknown
            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
  Target Milestone: ---
              Host: x86_64-linux-gnu
            Target: ppc64-linux-gnu

We ICE on:

$ ppc64-linux-gnu-gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/builtin-fctid-fctiw-runnable.c
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/builtin-fctid-fctiw-runnable.c:
In function ‘test_bi_lrint_1’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/builtin-fctid-fctiw-runnable.c:14:1:
error: unrecognizable insn:
 }
 ^
(insn 7 6 10 2 (set (reg:DI 122 [ _3 ])
        (unspec:DI [
                (reg:DF 121 [ _1 ])
            ] UNSPEC_FCTID))
"/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/builtin-fctid-fctiw-runnable.c":13
-1
     (nil))
during RTL pass: vregs
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/builtin-fctid-fctiw-runnable.c:14:1:
internal compiler error: in extract_insn, at recog.c:2304
0x573082 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        .././../gcc/rtl-error.c:108
0x5730a1 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        .././../gcc/rtl-error.c:116
0xae3f87 extract_insn(rtx_insn*)
        .././../gcc/recog.c:2304
0x887cfa instantiate_virtual_regs_in_insn
        .././../gcc/function.c:1599
0x887cfa instantiate_virtual_regs
        .././../gcc/function.c:1969
0x887cfa execute
        .././../gcc/function.c:2018