Faster compilation speed

[Richard Kenner]

    Or am I wrong?

Yes.

    Basically, what I'm saying is that it _does_ have everything to do with
    allocation efficiency. The gcc allocators have just always been bad.

No, it doesn't.  As I said, it has to do with *correctness* issues.  For
example, GCC assumes that there is exactly one copy of the RTL for each
pseudo-register so that when the pseudo is forced to memory, only that
RTL needs to be changed.

It also assumes that certain other RTL is *not* shared, so that it can
be changed without affecting any others insns.

Nothing whatsoever to do with memory management.