[Bug target/110843] New: ICE in convert_insn, at config/i386/i386-features.cc:1438 since r14-2405-g4814b63c3c2326

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110843

            Bug ID: 110843
           Summary: ICE in convert_insn, at
                    config/i386/i386-features.cc:1438 since
                    r14-2405-g4814b63c3c2326
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jamborm at gcc dot gnu.org
                CC: sayle at gcc dot gnu.org
  Target Milestone: ---
              Host: x86_64-linux
            Target: x86_64-linux

Since r14-2405-g4814b63c3c2326 (i386: Add AVX512 support for STV of
SI/DImode rotation by constant), I can see an ICE when compiling
testcase gcc.target/i386/pr70007.c with options -Oz -mavx512ifma:

mjambor@scala:/tmp$ ~/gcc/mine/inst/bin/gcc
~/gcc/mine/src/gcc/testsuite/gcc.target/i386/pr70007.c -Oz -mavx512ifma
/home/mjambor/gcc/mine/src/gcc/testsuite/gcc.target/i386/pr70007.c: In function
‘foo’:
/home/mjambor/gcc/mine/src/gcc/testsuite/gcc.target/i386/pr70007.c:22:1: error:
unrecognizable insn:
   22 | }
      | ^
(insn 11 10 86 3 (set (subreg:V2DI (reg:DI 160) 0)
        (rotatert:V2DI (subreg:V2DI (reg:DI 106) 0)
            (const_int 19 [0x13])))
"/home/mjambor/gcc/mine/src/gcc/testsuite/gcc.target/i386/pr70007.c":17:55 -1
     (expr_list:REG_DEAD (reg:DI 106)
        (expr_list:REG_UNUSED (reg:CC 17 flags)
            (nil))))
during RTL pass: stv
/home/mjambor/gcc/mine/src/gcc/testsuite/gcc.target/i386/pr70007.c:22:1:
internal compiler error: in convert_insn, at config/i386/i386-features.cc:1438
0x7cc810 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
        /home/mjambor/gcc/mine/src/gcc/rtl-error.cc:108
0x7cc82c _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
        /home/mjambor/gcc/mine/src/gcc/rtl-error.cc:116
0x86e6d4 convert_insn
        /home/mjambor/gcc/mine/src/gcc/config/i386/i386-features.cc:1438
0x141e59e convert
        /home/mjambor/gcc/mine/src/gcc/config/i386/i386-features.cc:1975
0x141e59e convert_scalars_to_vector
        /home/mjambor/gcc/mine/src/gcc/config/i386/i386-features.cc:2515
0x141e59e execute
        /home/mjambor/gcc/mine/src/gcc/config/i386/i386-features.cc:2678
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