[Bug middle-end/64242] Longjmp expansion incorrect

[wilco at gcc dot gnu.org]

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

--- Comment #18 from Wilco <wilco at gcc dot gnu.org> ---
(In reply to Jeffrey A. Law from comment #17)
> Or just emit a blockage insn to avoid the undesirable code motion.

I tried that already, it doesn't affect the forward substitution - I guess it
simply assumes it is always valid, and a function never writes to SFP/SP/FP.