Sharing hard registers
Thu Jun 13 19:09:00 GMT 2002
At 4:27 PM -0600 6/13/02, firstname.lastname@example.org wrote:
>In message <200206132203.g5DM3lv24315@potter.sfbay.redhat.com>,
> > On Thu, 13 Jun 2002 13:27:39 -0700, law wrote:
> > > It may be necessary to back out the last patch which makes gen_rtx_REG
> > > share hard registers in some circumstances.
> > >
The porting guide's "Structure Sharing Assumptions" needs to
be updated to
explicitly indicate that hard registers are "shared". Right
now, it just says
that pseudos are always shared.
Also, I'm curious about the issue of a hard-register with
more than one mode.
How does that work if R1 can be a SF or a SI mode value???
Doesn't the mode get in the way of sharing the hard register?
Or is this cached
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