https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103813
Bug ID: 103813
Summary: Crash in decompose, at wide-int.h:984 fold-const
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: k.even-mendoza at imperial dot ac.uk
Target Milestone: ---
The following code crashed GCC 11 and 12, with -O1, -O2, -O3 and -Os but -O0
works just fine.
struct a d;
struct a {
int b;
int c[]
} main() {
d.c[268435456] || d.c[1];
}
I tested it with GCC 11.1.0 Ubuntu 20.04 and GCC 12.0.0 20211216 (experimental)
Ubuntu 18. I can see other bugs open but none related to fold-const.
With that trace:
fuzzer-file-159198.c:6:3: internal compiler error: in decompose, at
wide-int.h:984
6 | d.c[268435456] || d.c[1];
| ^
0x6f4748 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-source/gcc/wide-int.h:984
0x6fbea1 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-source/gcc/tree.h:3555
0x6fbea1 wide_int_ref_storage<false,
false>::wide_int_ref_storage<generic_wide_int<wide_int_ref_storage<false,
false> > >(generic_wide_int<wide_int_ref_storage<false, false> > const&,
unsigned int)
.././../gcc-source/gcc/wide-int.h:1034
0x6fbea1 generic_wide_int<wide_int_ref_storage<false, false>
>::generic_wide_int<generic_wide_int<wide_int_ref_storage<false, false> >
>(generic_wide_int<wide_int_ref_storage<false, false> > const&, unsigned int)
.././../gcc-source/gcc/wide-int.h:790
0x6fbea1 unsigned long
wi::extract_uhwi<generic_wide_int<wide_int_ref_storage<false, false> >
>(generic_wide_int<wide_int_ref_storage<false, false> > const&, unsigned int,
unsigned int)
.././../gcc-source/gcc/wide-int.h:3212
0x6fbea1 unextend
.././../gcc-source/gcc/fold-const.c:6110
0xb991ed fold_truth_andor_1
.././../gcc-source/gcc/fold-const.c:6461
0xb9a4bd fold_truth_andor
.././../gcc-source/gcc/fold-const.c:9687
0xb7aaf4 fold_binary_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
.././../gcc-source/gcc/fold-const.c:12036
0xb82629 fold_build2_loc(unsigned int, tree_code, tree_node*, tree_node*,
tree_node*)
.././../gcc-source/gcc/fold-const.c:13781
0x9358b2 c_fully_fold_internal
.././../gcc-source/gcc/c/c-fold.c:545
0x936089 c_fully_fold(tree_node*, bool, bool*, bool)
.././../gcc-source/gcc/c/c-fold.c:125
0x8d00ec c_process_expr_stmt(unsigned int, tree_node*)
.././../gcc-source/gcc/c/c-typeck.c:11320
0x8d03cd c_finish_expr_stmt(unsigned int, tree_node*)
.././../gcc-source/gcc/c/c-typeck.c:11365
0x90409f c_parser_statement_after_labels
.././../gcc-source/gcc/c/c-parser.c:6261
0x9067ac c_parser_compound_statement_nostart
.././../gcc-source/gcc/c/c-parser.c:5798
0x927f75 c_parser_compound_statement
.././../gcc-source/gcc/c/c-parser.c:5607
0x929b2a c_parser_declaration_or_fndef
.././../gcc-source/gcc/c/c-parser.c:2544
0x932583 c_parser_external_declaration
.././../gcc-source/gcc/c/c-parser.c:1779
0x933093 c_parser_translation_unit
.././../gcc-source/gcc/c/c-parser.c:1652
Please submit a full bug report,
