[Bug middle-end/121509] [16 Regression] runtime differences with -march=znver3

[dcb314 at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121509

--- Comment #4 from David Binderman <dcb314 at hotmail dot com> ---
Created attachment 62101
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=62101&action=edit
C source code

After more than two hours of reduction, I attach 
the partially reduced code.