[Bug target/104839] [12 Regression] ppc64 regression of GCC 12: conditional long += long becomes unconditional SUBFC

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104839

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The test fails with -O1 and passes with -O1 -fno-forward-propagate

Also, the test passes with -Og and fails with -Og -fif-conversion