https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115758
Bug ID: 115758
Summary: Segmentation fault with -O2
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: luwei6 at nuaa dot edu.cn
Target Milestone: ---
fail.c:
#include <stdio.h>
#include<stdint.h>
int32_t a[10][10][10] = {0};
int32_t b = 0;
uint64_t **c;
uint64_t ***d = &c;
int16_t e = 1;
int16_t *f = &e;
uint64_t g;
uint64_t h;
uint64_t l[1];
const uint64_t **m;
void n() {
int32_t *o = &b;
if (*f) {
const uint64_t *p[] = {&l[1], &l[1], &l[1], &g, &h, &g, &l[1]};
const uint64_t **q = &p[3];
int32_t r[6][3][4];
r[0][0][0] = ++*d != (m = q);
}
*o = **m;
}
int main() {
int i = 1;
int j = 1;
int k = 1;
n();
for (; i < 5; i++)
for (j = 0; j < 5; j++)
for (k = 0; k < 5; k++)
printf("a[%d][%d][%d] = %d\n", i, j, k, a[i][j][k]);
return 0;
}
$ gcc-trunk fail.c -w -O2 && ./a.out
Segmentation fault
$ gcc-trunk fail.c -w -O3 && ./a.out
Segmentation fault
And this is This is the link to Compiler Explorer：
https://godbolt.org/z/7fjef489q
