[ColdFire 36/63] Use RTL for prologues and epilogues

[Roman Zippel]

Hi,

On Tue, 23 Jan 2007, Richard Sandiford wrote:

> > Considering the possibility we generate a movem pattern before reload, the 
> > pattern would be readonly anyway and would only have informational value 
> > and could be optional. The predicate check would then simply verify that 
> > this extra information matches the information in the unspec.
> >
> > OTOH considering that there is currently no use for this detailed 
> > information, I'd rather keep it simple (and the unspec doesn't preclude 
> > adding this information later).
> 
> I simply don't understand this argument.  The patch I posted
> describes what the pattern does in ordinary RTL, and verifies
> that the pattern is a valid h/w instruction.  That seems exactly
> the right thing to do.  Why go out of your way to introduce an
> unspec when a patch that doesn't need it already exists?

The point is that I think that all the verification/extraction code is 
wasteful for something we know is static.

bye, Roman