[Bug rtl-optimization/89435] [7/8/9 Regression] wrong code with -O1 -march=armv4 -fno-forward-propagate with __builtin_sub_overflow()

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89435

--- Comment #7 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
*** Bug 89815 has been marked as a duplicate of this bug. ***