[Bug c/71801] New: ice in fix_debug_reg_uses

[dcb314 at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71801

            Bug ID: 71801
           Summary: ice in fix_debug_reg_uses
           Product: gcc
           Version: 7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dcb314 at hotmail dot com
  Target Milestone: ---

Created attachment 38858
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=38858&action=edit
C source code

The attached code, when compiled by gcc trunk dated 20160706, and
compiler flags -g -O2, does this:

$ ../results/bin/gcc -c -O2 -g bug296.c
bylabel.c: In function ‘uuidcache_init’:
bylabel.c:197:1: internal compiler error: in fix_debug_reg_uses, at
config/i386/i386.c:3818
0xfa7d15 timode_scalar_chain::fix_debug_reg_uses(rtx_def*)
        ../../src/trunk/gcc/config/i386/i386.c:3817
0xfaba12 timode_scalar_chain::fix_debug_reg_uses(rtx_def*)
        ../../src/trunk/gcc/config/i386/i386.c:3799
0xfaba12 timode_scalar_chain::convert_insn(rtx_insn*)
        ../../src/trunk/gcc/config/i386/i386.c:3844
0xfd1b10 scalar_chain::convert()
        ../../src/trunk/gcc/config/i386/i386.c:3932