[Bug target/79804] New: ICE in print_reg, at config/i386/i386.c:17637

["marxin at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79804

            Bug ID: 79804
           Summary: ICE in print_reg, at config/i386/i386.c:17637
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Keywords: ice-on-invalid-code
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
  Target Milestone: ---
            Target: x86_64-*-*, i?86-*-*

This is small spin-off of PR79729, we ICE on a ppc test-case:

$ gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/shrink-wrap-separate-0.c
 -O2
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/shrink-wrap-separate-0.c:
In function ‘f’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/shrink-wrap-separate-0.c:22:1:
internal compiler error: in print_reg, at config/i386/i386.c:17637
 }
 ^
0xf5db63 print_reg(rtx_def*, int, _IO_FILE*)
        ../../gcc/config/i386/i386.c:17634
0xf82984 ix86_print_operand(_IO_FILE*, rtx_def*, int)
        ../../gcc/config/i386/i386.c:18343
0x8e999c output_operand(rtx_def*, int)
        ../../gcc/final.c:3891
0x8ea25e output_asm_insn(char const*, rtx_def**)
        ../../gcc/final.c:3807
0x8eb7ff final_scan_insn(rtx_insn*, _IO_FILE*, int, int, int*)
        ../../gcc/final.c:3058
0x8ec8b2 final(rtx_insn*, _IO_FILE*, int)
        ../../gcc/final.c:2051
0x8ed069 rest_of_handle_final
        ../../gcc/final.c:4489
0x8ed069 execute
        ../../gcc/final.c:4562