[Bug target/92573] New: [10 Regression] ICE in extract_insn, at recog.c:2311

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92573

            Bug ID: 92573
           Summary: [10 Regression] ICE in extract_insn, at recog.c:2311
           Product: gcc
           Version: 10.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
                CC: jakub at gcc dot gnu.org, segher at gcc dot gnu.org
  Target Milestone: ---
            Target: powerpc-*-linux-gnu

gcc-10.0.0-alpha20191117 snapshot (r278376) ICEs when compiling
gcc/testsuite/gcc.target/powerpc/dfp/dtstsfi-71.c w/ -mcpu=power9 -O1
-ffast-math, this time w/ _Decimal64:

% powerpc-e300c3-linux-gnu-gcc-10.0.0-alpha20191117 -mcpu=power9 -O1
-ffast-math gcc/testsuite/gcc.target/powerpc/dfp/dtstsfi-71.c
gcc/testsuite/gcc.target/powerpc/dfp/dtstsfi-71.c: In function
'doTestBCDSignificance':
gcc/testsuite/gcc.target/powerpc/dfp/dtstsfi-71.c:13:1: error: unrecognizable
insn:
   13 | }
      | ^
(insn 8 7 12 2 (set (reg:SI 118 [ <retval> ])
        (unordered:SI (reg:CCFP 121)
            (const_int 0 [0])))
"gcc/testsuite/gcc.target/powerpc/dfp/dtstsfi-71.c":12:10 -1
     (nil))
during RTL pass: vregs
gcc/testsuite/gcc.target/powerpc/dfp/dtstsfi-71.c:13:1: internal compiler
error: in extract_insn, at recog.c:2311
0x667f54 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-10.0.0_alpha20191117/work/gcc-10-20191117/gcc/rtl-error.c:108
0x667f74 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-10.0.0_alpha20191117/work/gcc-10-20191117/gcc/rtl-error.c:116
0x66618f extract_insn(rtx_insn*)
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-10.0.0_alpha20191117/work/gcc-10-20191117/gcc/recog.c:2311
0xac4ce3 instantiate_virtual_regs_in_insn
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-10.0.0_alpha20191117/work/gcc-10-20191117/gcc/function.c:1607
0xac4ce3 instantiate_virtual_regs
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-10.0.0_alpha20191117/work/gcc-10-20191117/gcc/function.c:1977
0xac4ce3 execute
       
/var/tmp/portage/cross-powerpc-e300c3-linux-gnu/gcc-10.0.0_alpha20191117/work/gcc-10-20191117/gcc/function.c:2026