Reload problem on ppc64 (was: Analysis of high priority PR c/2454)

[Geoff Keating]

David Edelsohn <dje@watson.ibm.com> writes:

> 	GCC seems to be confused by the DImode values in FPRs.  I think
> that maybe the constraints for the DImode operands should add the "*"
> modifier so that the FPR only is used as a constraint and not register
> preferences.  The register preferencing is what seems to be confusing the
> compiler.  Does that seem like a useful approach?

It would depend on why the register preferences are being confusing.
I would suspect a bug elsewhere (perhaps wrong ordering of operands or
insufficient union classes or just a plain bug in regpref).

-- 
- Geoffrey Keating <geoffk@geoffk.org> <geoffk@redhat.com>