| Compiler | Implementations |
| g++ -mcpu=sifive-u54 -O2 -fomit-frame-pointer -fwrapv -fPIC -fPIE | T:ref |
| g++ -mcpu=sifive-u54 -O3 -fomit-frame-pointer -fwrapv -fPIC -fPIE | T:ref |
| g++ -mcpu=sifive-u54 -O -fomit-frame-pointer -fwrapv -fPIC -fPIE | T:ref |
| g++ -mcpu=sifive-u54 -Os -fomit-frame-pointer -fwrapv -fPIC -fPIE | T:ref |