> I found a weird piece of code that was added by kenner in a really early
> revision. It checks for VAR_DECLs with frame or stack pointers as
> DECL_RTL, and the comment in front of it mentions strength reduction.
> Presumably this was for the old loop optimizer? I can't think of
> anything that would require this in a modern version of gcc.
I think such a VAR_DECL would occur in cases of alloca. I don't understand
the comment about strength reduction (despite obviously having written it!)
because the old loop optimizer ran on RTL and this is talking about trees.
My guess is that this isn't dead.