An alpha egcs bug

[H.J. Lu]

> 
> On Wed, Oct 22, 1997 at 04:35:07PM -0600, Jeffrey A Law wrote:
> > I didn't read this thread real close, but it might be worth
> > looking at CLASS_CANNOT_CHANGE_SIZE.
> 
> No, I've seen this problem before in another form. 
> 
> The problem, IMO, is that somewhere in all the myriad SUBREG's that the
> alpha backend generates, reload looses track of what width a pseudo
> actually needs across a spill/reload.  It winds up storing 32 bits
> and reading back 64.
> 

That is what happened in my test case. One feature on alpha is
when you load a 32 bit int into a register, you always fill
64 bit. If you only deal with registers, it is ok to load 32 bit
and read 64 bit. The problem is memory access.

H.J.