[Bug tree-optimization/126889] New: ICE: Segmentation fault in path_range_query::ssa_range_in_phi during back_threader pass

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126889

            Bug ID: 126889
           Summary: ICE: Segmentation fault in
                    path_range_query::ssa_range_in_phi during
                    back_threader pass
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: defsyn at gmail dot com
  Target Milestone: ---

Created attachment 65341
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=65341&action=edit
preprocessed source (dwarf.c)

GCC version: 17.0.0 (experimental unreleased master branch)
System: Debian x86_64
Building: binutils (dwarf.c) (close to latest pull (binutils-gdb, August
14,2026)
Building on x86_64-pc-linux-gnu AMD Debian Trixie
Host: x86_64-pc-linux-gnu
Binutils target: x86_64-w64-mingw32 

../../configure --prefix=/opt/mingw-gcc-17 --disable-gdb
--{build,host}=x86_64-pc-linux-gnu --target=x86_64-w64-mingw32
--with-{gmp,mpfr,mpc,isl}=/opt/gcc-depends
--enable-targets=x86_64-64-mingw32,i686-w64-mingw32

An internal compiler error occurs during the backward jump threading
optimization pass when compiling dwarf.c at -O2 with -march=broadwell.

Command line used to trigger the ICE:
gcc -c -I . -D HAVE_CONFIG_H ../../../src/binutils-gdb/binutils/dwarf.c
-mtune=broadwell -march=broadwell -g -O2

Stack trace:
internal compiler error: Segmentation fault
process_cu_tu_index (struct dwarf_section *section, int do_display)
path_range_query::ssa_range_in_phi(vrange&, gphi*)
path_range_query::range_defined_in_block(vrange&, tree_node*, basic_block_def*)
path_range_query::internal_range_of_expr(vrange&, tree_node*, gimple*)
back_threader::maybe_register_path

relevant error message: " ../../../src/binutils-gdb/binutils/dwarf.c:12639:1:
internal compiler error: Segmentation fault
12639 | process_cu_tu_index (struct dwarf_section *section, int do_display)"