https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118344
Bug ID: 118344
Summary: Crash at -O3: internal compiler error: Segmentation
fault
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: yunboni at smail dot nju.edu.cn
Target Milestone: ---
This code crashes at -O3:
```c
int d, e, g, h, i, c, j;
static short k;
char o;
static int *p;
static long *a;
int b[0];
int q(int s, int t, int *u, int *v) {
for (int f = 0; f < s; f++)
if ((t & v[f]) != u[f])
return 0;
return 1;
}
int w(int s, int t) {
int l[] = {t, t, t, t}, m[] = {e, e, 3, 1};
int n = q(s, d, l, m);
return n;
}
int x(unsigned s) {
unsigned r;
if (s >= -1)
return 1;
r = 10000000;
while (s > 1 / r)
r /= 2;
return g ? 2 : 0;
}
void y() {
for (;;) {
b[w(8, *p)] = h;
for (; a + k; j = o)
i &= c = x(6) < 0;
}
}
void main() {}
```
Compiler Explorer: https://godbolt.org/z/6b5d3e6Ej
It seems to be a recent regression.
Crash:
```
during GIMPLE pass: ifcombine
<source>: In function 'y':
<source>:27:6: internal compiler error: Segmentation fault
27 | void y() {
| ^
```
Backtrace:
```
0x261f405 diagnostic_context::diagnostic_impl(rich_location*,
diagnostic_metadata const*, diagnostic_option_id, char const*, __va_list_tag
(*) [1], diagnostic_t)
???:0
0x2636206 internal_error(char const*, ...)
???:0
0x15523ca wi::force_to_size(long*, long const*, unsigned int, unsigned int,
unsigned int, signop)
???:0
0xd0549e wide_int_storage::from(generic_wide_int<wide_int_ref_storage<false,
true> > const&, unsigned int, signop)
???:0
0xd97152 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**)
???:0
```
