This is the mail archive of the
gcc@gcc.gnu.org
mailing list for the GCC project.
Re: Help with define_insn and constraints
Richard Henderson <rth@redhat.com> writes:
> On Thu, Dec 23, 2004 at 04:37:40PM -0500, Ian Lance Taylor wrote:
> > > ?? In your first post, you said you had 19 hard regs. Does this not imply
> > > you're trying to keep your frame pointer in a pseudo ??
> >
> > In gcc, it's normal for the frame pointer to be a pseudo which is
> > eliminated to the stack pointer, or, in the case of a function which
> > calls alloca, to be eliminated to some hard register which serves as
> > the so-called hard frame pointer. See FRAME_POINTER_REGNUM and
> > HARD_FRAME_POINTER_REGNUM.
>
> No. The frame pointer is *never* a pseudo. Sometimes a fake
> hard register, but never a pseudo.
Right, sorry. I did mean to say a fake register.
Ian