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.
