[Bug middle-end/64242] Longjmp expansion incorrect

[wilco at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64242

--- Comment #16 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Christophe Lyon from comment #9)
> Created attachment 45138 [details]
> QEMU traces for --with-cpu=cortex-m3 / QEMU --cpu cortex-m3

Thanks, I can reproduce this now. It fails due to sched1 scheduling the move
before the sp restore (correct at this point since it doesn't use a frame
pointer) and reload then forward propagates a frame pointer use into it. Even
if I add additional clobbers for sfp it won't block the substitution.

So maybe we need an unspec around the address generation to be safe.