https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120870
--- Comment #41 from Steven Sun <StevenSun2021 at hotmail dot com> ---
The following reproduction will also trigger this issue.
runtime segfault when compiled with `-march=znver2 -O0`
```
void ext(long a, long b, long c, long d, long e, long f, long g) {}
__attribute__((preserve_none)) void tail(long a, long b) {}
__attribute__((preserve_none)) void caller(long a, long b, long c, long d,
long e, long f, long g) {
__attribute__((aligned(32))) long x[4]; // for stack alignment
ext(a, b, c, d, e, f, g);
__attribute__((musttail)) return tail(a + b, b + c);
}
int main() { caller(1, 2, 3, 4, 5, 6, 7); }
```
trunk: 06df6148a31106ea0fce777cfe72b4dd5a545b8c
https://godbolt.org/z/GqGaK87Yv
