https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116856
--- Comment #6 from Robert Hölzl <robert.hoelzl at posteo dot de> ---
Sorry I oversimplified the Problem. Here is the self contained C-file that
allows to reproduce the Problem:
```
#include <stdint.h>
void f()
{
static uint8_t array[64];
for (uint8_t i = 0; i < sizeof(array); i++)
{
*(uint32_t __attribute__ ((__aligned__(1)))*) &array[i + 4] ^=
*(uint32_t __attribute__ ((__aligned__(1)))*)
&array[i];
}
}
```
Please note that you can neither remove the for loop nor the refactor the type
case into a typedef without making the issue vanish.
My command line was like
```
"C:\Program Files (x86)\Arm GNU Toolchain arm-none-eabi\13.3
rel1\bin\arm-none-eabi-gcc.exe" -Os -mcpu=cortex-m33 -S -c demo.c
```
Please note that the parameter "-Os" (or "-Oz") is required to reproduce the
problem.
