https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97979
Bug ID: 97979
Summary: internal compiler error: Segmentation fault with "-O3
-fno-toplevel-reorder -fno-tree-ccp"
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: suochenyao at 163 dot com
Target Milestone: ---
*******************************************************************************
OS and Platform:
CentOS Linux release 7.8.2003 (Core), x86_64 GNU/Linux
*******************************************************************************
Program:
short a=0;
int b=0;
void c() {
unsigned short d = b;
a = d >> 18446744073709551614;
}
int main() {}
*******************************************************************************
gcc version:
$ gcc -v
Using built-in specs.
COLLECT_GCC=/home/suocy/bin/gcc-dev/bin/gcc
COLLECT_LTO_WRAPPER=/home/suocy/bin/gcc-dev/libexec/gcc/x86_64-pc-linux-gnu/11.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --prefix=/home/suocy/bin/gcc-dev/
--disable-multilib --enable-languages=c,c++
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 11.0.0 20201124 (experimental) (GCC)
*******************************************************************************
Command Lines:
$ gcc -Wall -Wextra -fno-strict-aliasing -fwrapv -O3 -fno-toplevel-reorder
-fno-tree-ccp a.c
a.c: In function ‘c’:
a.c:5:12: warning: integer constant is so large that it is unsigned
5 | a = d >> 18446744073709551614;
| ^~~~~~~~~~~~~~~~~~~~
a.c:5:9: warning: right shift count >= width of type [-Wshift-count-overflow]
5 | a = d >> 18446744073709551614;
| ^~
during GIMPLE pass: forwprop
a.c:3:6: internal compiler error: Segmentation fault
3 | void c() {
| ^
0xdeaf5f crash_signal
../../gcc/toplev.c:330
0xab3770 tree_swap_operands_p(tree_node const*, tree_node const*)
../../gcc/fold-const.c:7398
0x1224d14 gimple_resimplify2
../../gcc/gimple-match-head.c:298
0x128c1ea gimple_simplify_100
/home/suocy/src/gcc-dev/gcc/build/gcc/gimple-match.c:6581
0x128cedf gimple_simplify_RSHIFT_EXPR
/home/suocy/src/gcc-dev/gcc/build/gcc/gimple-match.c:107758
0x1224dac gimple_resimplify2
../../gcc/gimple-match-head.c:318
0x126535a gimple_simplify(gimple*, gimple_match_op*, gimple**, tree_node*
(*)(tree_node*), tree_node* (*)(tree_node*))
../../gcc/gimple-match-head.c:957
0xb20aee fold_stmt_1
../../gcc/gimple-fold.c:5930
0xf13111 execute
../../gcc/tree-ssa-forwprop.c:3103
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
