https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122797
--- Comment #3 from Kacper Michajłow <kasper93 at gmail dot com> ---
I've reduced the above function to standalone testcase. You can compare result
value with any other working compiler. {src,dst}_stride is set to 0 in global
variable, just so things are not optimized out.
```
#include <stdio.h>
int src_stride = 0;
int dst_stride = 0;
int main() {
char src[12] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12};
char dst[16];
char *s = src;
char *d = dst;
for (int i = 0; i < 2; i++) {
d[0] = s[0] + s[1] + s[2] + s[3] + s[4];
d[1] = s[1] + s[2] + s[3] + s[4] + s[5];
d[2] = s[2] + s[3] + s[4] + s[5] + s[6];
d[3] = s[3] + s[4] + s[5] + s[6] + s[7];
d[4] = s[4] + s[5] + s[6] + s[7] + s[8];
d[5] = s[5] + s[6] + s[7] + s[8] + s[9];
d[6] = s[6] + s[7] + s[8] + s[9] + s[10];
d[7] = s[7] + s[8] + s[9] + s[10] + s[11];
s += src_stride;
d += dst_stride;
}
printf("%d", d[0]);
}
```
