https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90794
Bug ID: 90794
Summary: adding -O3 leads to crash
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: zhonghao at pku dot org.cn
Target Milestone: ---
My gcc is 10.0.0, and my code is:
#include <malloc.h>
int run(int sz)
{
typedef double MAT[sz][sz];
MAT *a;
a = (MAT*) malloc(sizeof(MAT));
return (a==0);
}
int main(int argc, char* argv[])
{
return run(500);
}
I compiles well, but after adding -O3, it crashes:
: In function ‘int main(int, char**)’:
: internal compiler error: Segmentation fault
11 | int main(int argc, char* argv[])
| ^~~~
0xb3badf crash_signal
../../9.1/gcc/toplev.c:326
0xc1660d has_zero_uses
../../9.1/gcc/ssa-iterators.h:389
0xc1660d coalesce_with_default
../../9.1/gcc/tree-ssa-coalesce.c:1019
0xc1660d populate_coalesce_list_for_outofssa
../../9.1/gcc/tree-ssa-coalesce.c:1241
0xc1660d coalesce_ssa_name(_var_map*)
../../9.1/gcc/tree-ssa-coalesce.c:1709
0xbc96eb remove_ssa_form
../../9.1/gcc/tree-outof-ssa.c:1031
0xbc96eb rewrite_out_of_ssa(ssaexpand*)
../../9.1/gcc/tree-outof-ssa.c:1289
0x7b8500 execute
../../9.1/gcc/cfgexpand.c:6327
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.
