[Bug target/109069] Vector truncation test program produces incorrect result on big-endian powerpc64-linux-gnu with -mcpu=power10 -O2

[john_platts at hotmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109069

--- Comment #1 from John Platts <john_platts at hotmail dot com> ---
The C++ test program below does generate the correct results when compiled with
the -mcpu=power10 -O0 options.