Re: SIMPLE: A language-independent tree IR

[Diego Novillo <dnovillo at redhat dot com>]

On Mon, 07 Jan 2002, Alexandre Oliva wrote:

> However, the similarity between SIMPLE and RTL makes me wonder how
> much of gain we're really going to have by introducing such
> optimizations on trees, instead of just converting to a MI RTL and
> applying optimizations there.
> 
The kind of symbolic information and structured control flow
available in trees is lost as soon as you go down to RTL.
Re-creating in RTL the information that we already have in trees
is a waste of effort.

Instead, we should use IRs at their appropriate level of
abstraction.  We will most probably benefit from having both a
lower-level tree IR and a higher-level register IR.


Diego.