[Bug ipa/121519] New: ICE on valid code at -O3 on x86_64-linux-gnu: in upper_bound, at value-range.h:1186

[zhendong.su at inf dot ethz.ch via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121519

            Bug ID: 121519
           Summary: ICE on valid code at -O3 on x86_64-linux-gnu: in
                    upper_bound, at value-range.h:1186
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: ipa
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhendong.su at inf dot ethz.ch
  Target Milestone: ---

Compiler Explorer: https://godbolt.org/z/PPo93z5bo

Note:
- fails: trunk
- works: 15.2 and earlier

[571] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/home/suz/suz-local/software/local/gcc-trunk/bin/../libexec/gcc/x86_64-pc-linux-gnu/16.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-trunk/configure --disable-bootstrap
--enable-checking=yes --prefix=/local/suz-local/software/local/gcc-trunk
--enable-sanitizers --enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 16.0.0 20250811 (experimental) (GCC)
[572] %
[572] % gcctk -O3 -c small.c
during GIMPLE pass: thread
small.c: In function ‘main’:
small.c:23:5: internal compiler error: in upper_bound, at value-range.h:1186
   23 | int main() {
      |     ^~~~
0x254a046 internal_error(char const*, ...)
        ../../gcc-trunk/gcc/diagnostic-global-context.cc:534
0xa05900 fancy_abort(char const*, int, char const*)
        ../../gcc-trunk/gcc/diagnostics/context.cc:1687
0xea2fd8 irange::upper_bound() const
        ../../gcc-trunk/gcc/value-range.h:1186
0xea2fd8 irange::upper_bound() const
        ../../gcc-trunk/gcc/value-range.h:1183
0x10c4329 operator_lshift::op1_range(irange&, tree_node*, irange const&, irange
const&, relation_trio) const
        ../../gcc-trunk/gcc/range-op.cc:2868
0xdf89ed gori_compute::compute_operand1_range(vrange&,
gimple_range_op_handler&, vrange const&, fur_source&, value_relation*)
        ../../gcc-trunk/gcc/gimple-range-gori.cc:1162
0xdfb34b gori_compute::compute_operand_range(vrange&, gimple*, vrange const&,
tree_node*, fur_source&, value_relation*)
        ../../gcc-trunk/gcc/gimple-range-gori.cc:754
0xdfaae9 gori_compute::compute_operand_range(vrange&, gimple*, vrange const&,
tree_node*, fur_source&, value_relation*)
        ../../gcc-trunk/gcc/gimple-range-gori.cc:769
0xdfaae9 gori_compute::compute_operand_range(vrange&, gimple*, vrange const&,
tree_node*, fur_source&, value_relation*)
        ../../gcc-trunk/gcc/gimple-range-gori.cc:769
0xdfca0b gori_compute::edge_range_p(vrange&, edge_def*, tree_node*,
range_query&)
        ../../gcc-trunk/gcc/gimple-range-gori.cc:1420
0xde7ba0 ranger_cache::edge_range(vrange&, edge_def*, tree_node*,
ranger_cache::rfd_mode)
        ../../gcc-trunk/gcc/gimple-range-cache.cc:1235
0xde6b7d ranger_cache::resolve_dom(vrange&, tree_node*, basic_block_def*)
        ../../gcc-trunk/gcc/gimple-range-cache.cc:1689
0xde7350 ranger_cache::range_from_dom(vrange&, tree_node*, basic_block_def*,
ranger_cache::rfd_mode)
        ../../gcc-trunk/gcc/gimple-range-cache.cc:1800
0xde906c ranger_cache::range_from_dom(vrange&, tree_node*, basic_block_def*,
ranger_cache::rfd_mode)
        ../../gcc-trunk/gcc/gimple-range-cache.cc:1703
0xde906c ranger_cache::fill_block_cache(tree_node*, basic_block_def*,
basic_block_def*)
        ../../gcc-trunk/gcc/gimple-range-cache.cc:1486
0xdeaa7a ranger_cache::block_range(vrange&, basic_block_def*, tree_node*, bool)
        ../../gcc-trunk/gcc/gimple-range-cache.cc:1313
0xdddd99 gimple_ranger::range_on_entry(vrange&, basic_block_def*, tree_node*)
        ../../gcc-trunk/gcc/gimple-range.cc:174
0xde0f47 gimple_ranger::range_of_expr(vrange&, tree_node*, gimple*)
        ../../gcc-trunk/gcc/gimple-range.cc:146
0xddd987 gimple_ranger::range_on_exit(vrange&, basic_block_def*, tree_node*)
        ../../gcc-trunk/gcc/gimple-range.cc:211
0xde152a gimple_ranger::range_on_edge(vrange&, edge_def*, tree_node*)
        ../../gcc-trunk/gcc/gimple-range.cc:258
Please submit a full bug report, with preprocessed source (by using
-freport-bug).
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
[573] %
[573] % cat small.c
extern int g(void);
int a, b, c;
int e(int f) {
  int d = 0;
  for (; d < 6; d++) {
    a = f <<= 1;
    if (f & 64)
      f ^= 67;
  }
  return a;
}
void h() {
  int i = 0;
  if (c)
    goto j;
  i = -32644994;
k:
  b = 0;
j:
  if (g() - 508050053 + e(i + 79))
    goto k;
}
int main() {
  while (a)
    h();
  return 0;
}