pa reload problem

[Alan Modra]

On Mon, 4 Dec 2000, John David Anglin wrote:

> > On Mon, 4 Dec 2000, Richard Hirst wrote:
> > 
> > > > Note that all of the above applies to 32-bit modutils too.
> > > 
> > > Shouldn't be an issue with 32 bit, as kernel and modules all have
> > > the same dp there.
> > 
> > Yes, silly me.  32 bit is non-pic, so you don't need to worry about
> > it.  (%r19 in 32 bit case)
> 
> However, it may be an issue for 32 bit pic code under hpux.  It is not
> clear to me why this didn't show up before with 32 bit pic code.  For
> some reason, the circumstances which caused combine to delete the set
> restoring dp after function calls didn't seem to occur.

Hi Dave,
  Richard and I had wandered off-topic in the above exchange, and were
talking about modutils and stubs, in particular stub calls to millicode.

Getting back on topic, the reload problem _does_ affect 32 bit hppa code.
Compiling my testcase with -O2 -fPIC -S, gives

        copy %r19,%r4
        bl foo,%r2
        stw %r19,-32(%r30)
        addil LT'cpu_hz,%r4
        copy %r1,%r21
        addil LT'.LC0,%r19		! oops
        ldw RT'cpu_hz(%r21),%r21
        ldw RT'.LC0(%r1),%r1

Alan
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