[Bug target/63347] m68k misoptimisation with -fschedule-insns

[mikpelinux at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63347

--- Comment #9 from Mikael Pettersson <mikpelinux at gmail dot com> ---
This wrong-code started with Bernd's r171845, possibly by exposing a latent
issue.