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List:       gcc-bugs
Subject:    [Bug middle-end/112321] New: [14 Regression] ICE during GIMPLE pass: dse: : Segmentation fault
From:       "slyfox at gcc dot gnu.org via Gcc-bugs" <gcc-bugs () gcc ! gnu ! org>
Date:       2023-10-31 19:27:07
Message-ID: bug-112321-4 () http ! gcc ! gnu ! org/bugzilla/
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112321

            Bug ID: 112321
           Summary: [14 Regression] ICE during GIMPLE pass: dse: :
                    Segmentation fault
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: slyfox at gcc dot gnu.org
  Target Milestone: ---

Noticed ICE on today's gcc-master at r14-5043-g2b19c387696b0d. There it fails
to build binutils' gold. Extracted sample:

// $ cat bug.cc

void writeval(unsigned char *, long);
unsigned do_write_count;
void do_write() {
  unsigned char *pov;
  int limit(do_write_count > 8 ? true : do_write_count);
  for (int i = 0; i < limit; ++i)
    pov += 2;
  int ext_cnt = do_write_count - 8;
  for (; 0 < ext_cnt;) {
    writeval(pov, 0);
    pov += 4;
    ext_cnt--;
  }
}

Crashing:

$ gcc/xg++ -B./gcc -g -O1 -c bug.cc -o a.o
during GIMPLE pass: dse
bug.cc: In function ‘void do_write()':
bug.cc:3:6: internal compiler error: Segmentation fault
    3 | void do_write() {
      |      ^~~~~~~~
0x8ebef5a crash_signal
        gcc/toplev.cc:315
0x8b42800 phi_nodes_ptr(basic_block_def*)
        gcc/gimple.h:4700
0x8b42800 gsi_start_phis(basic_block_def*)
        gcc/gimple-iterator.cc:935
0x8b42800 gsi_for_stmt(gimple*)
        gcc/gimple-iterator.cc:620
0x9121a03 insert_debug_temp_for_var_def(gimple_stmt_iterator*, tree_node*)
        gcc/tree-ssa.cc:471
0x9121f2e insert_debug_temps_for_defs(gimple_stmt_iterator*)
        gcc/tree-ssa.cc:506
0x8b42690 gsi_remove(gimple_stmt_iterator*, bool)
        gcc/gimple-iterator.cc:567
0x8ffe08b execute
        gcc/tree-ssa-dse.cc:1685

$ gcc/xg++ -Bgcc -v
Reading specs from ./gcc/specs
COLLECT_GCC=./gcc/xg++
COLLECT_LTO_WRAPPER=./gcc/lto-wrapper
Target: i686-pc-linux-gnu
Configured with: ../gcc/configure --disable-bootstrap
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20231031 (experimental) (GCC)=
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