Ltac jmstep_inv :=
match goal with
| H : JuicyMachine.start_thread _ _ _ _  |- _ => inversion H
| H : JuicyMachine.resume_thread _ _ _   |- _ => inversion H
| H : JuicyMachine.threadStep _ _ _ _ _           |- _ => inversion H
| H : JuicyMachine.suspend_thread _ _ _ |- _ => inversion H
| H : JuicyMachine.syncStep _ _ _ _ _ _           |- _ => inversion H
(*  | H : JuicyMachine.threadHalted _                   |- _ => inversion H*)
| H : JuicyMachine.schedfail _         |- _ => inversion H
end; try subst.
Ltac getThread_inv :=
match goal with
| [ H : getThreadC ?i _ _ = _ ,
H2 : getThreadC ?i _ _ = _ |- _ ] =>
pose proof (getThreadC_fun _ _ _ _ _ _ _ H H2)
| [ H : getThreadR ?i _ _ = _ ,
H2 : getThreadR ?i _ _ = _ |- _ ] =>
pose proof (getThreadR_fun _ _ _ _ _ _ _ H H2)
end.
Ltac substwith x y := assert (x = y) by apply proof_irr; subst x.

Lemma access_at_fold m b ofs k :
(mem_access m) !! b ofs k = access_at m (b, ofs) k.