https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120074
Bug ID: 120074
Summary: ICE on valid code at -O1 with "-fno-tree-copy-prop
-fno-tree-forwprop -fno-tree-ccp" on x86_64-linux-gnu:
in decompose, at wide-int.h:1049
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: zhendong.su at inf dot ethz.ch
Target Milestone: ---
Compiler Explorer: https://godbolt.org/z/1MeYKeG1Y
It appears to be a recent regression as it only affects 15.1 and later.
[638] % gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/local/suz-local/software/local/gcc-trunk/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 20250502 (experimental) (GCC)
[639] %
[639] % gcctk -O1 small.c; ./a.out
0
[640] % gcctk -O1 -fno-tree-copy-prop -fno-tree-forwprop -fno-tree-ccp small.c
during GIMPLE pass: ifcombine
small.c: In function ‘main’:
small.c:5:5: internal compiler error: in decompose, at wide-int.h:1049
5 | int main() {
| ^~~~
0x2701d06 internal_error(char const*, ...)
../../gcc-trunk/gcc/diagnostic-global-context.cc:517
0xacb494 fancy_abort(char const*, int, char const*)
../../gcc-trunk/gcc/diagnostic.cc:1748
0x820f6e wi::int_traits<generic_wide_int<wide_int_ref_storage<false, false> >
>::decompose(long*, unsigned int, generic_wide_int<wide_int_ref_storage<false,
false> > const&)
../../gcc-trunk/gcc/wide-int.h:1049
0xe3adb7 wi::int_traits<generic_wide_int<wide_int_storage> >::decompose(long*,
unsigned int, generic_wide_int<wide_int_storage> const&)
../../gcc-trunk/gcc/wide-int.h:1272
0xe3adb7 wide_int_ref_storage<true,
false>::wide_int_ref_storage<generic_wide_int<wide_int_storage>
>(generic_wide_int<wide_int_storage> const&, unsigned int)
../../gcc-trunk/gcc/wide-int.h:1099
0xe3adb7 generic_wide_int<wide_int_ref_storage<true, false>
>::generic_wide_int<generic_wide_int<wide_int_storage>
>(generic_wide_int<wide_int_storage> const&, unsigned int)
../../gcc-trunk/gcc/wide-int.h:855
0xe3adb7 wi::binary_traits<generic_wide_int<wide_int_storage>,
generic_wide_int<wide_int_storage>,
wi::int_traits<generic_wide_int<wide_int_storage> >::precision_type,
wi::int_traits<generic_wide_int<wide_int_storage>
>::precision_type>::result_type wi::bit_and<generic_wide_int<wide_int_storage>,
generic_wide_int<wide_int_storage> >(generic_wide_int<wide_int_storage> const&,
generic_wide_int<wide_int_storage> const&)
../../gcc-trunk/gcc/wide-int.h:2756
0xe3adb7 generic_wide_int<wide_int_storage>&
generic_wide_int<wide_int_storage>::operator&=<generic_wide_int<wide_int_storage>
>(generic_wide_int<wide_int_storage> const&)
../../gcc-trunk/gcc/wide-int.h:817
0xe8208b fold_truth_andor_for_ifcombine(tree_code, tree_node*, unsigned long,
tree_code, tree_node*, tree_node*, unsigned long, tree_code, tree_node*,
tree_node*, tree_node**)
../../gcc-trunk/gcc/gimple-fold.cc:8340
0x13cc035 ifcombine_ifandif
../../gcc-trunk/gcc/tree-ssa-ifcombine.cc:976
0x13cc3ac tree_ssa_ifcombine_bb_1
../../gcc-trunk/gcc/tree-ssa-ifcombine.cc:1107
0x13cc86a tree_ssa_ifcombine_bb
../../gcc-trunk/gcc/tree-ssa-ifcombine.cc:1207
0x13cc86a execute
../../gcc-trunk/gcc/tree-ssa-ifcombine.cc:1400
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.
[641] %
[641] % cat small.c
int printf(const char *, ...);
short a;
int b;
int c(int d, int e) { return d < 0 || d > 2147483647 >> e; }
int main() {
int f = c((b ^ a) & 3, 30);
printf("%d\n", f);
return 0;
}
