PATCH: [4.1/4.2 Regression]: Miscompiled FORTRAN program

[H. J. Lu]

On Tue, Feb 14, 2006 at 01:59:21PM -0800, Jim Wilson wrote:
> H. J. Lu wrote:
> >        PR rtl-optimization/25603
> >        * reload.c (reg_inc_found_and_valid_p): New.
> >	(regno_clobbered_p): Handle REG_INC as 25603 workaround.
> 
> I don't believe this is safe.  If you look at the uses of 
> regno_clobbered_p in reload.c, the comments clearly indicate that we are 
> looking for registers used in clobbers.  So unconditionally adding code 
> that handles REG_INC notes will break these uses.  You have to add the 
> REG_INC support the same way that the sets support was added, by adding 
> another argument (or reusing the sets argument), and then modifying the 
> one place we know is broken (choose_reload_regs) to use the new argument 
> (or new sets argument value).

I see. We will add a new argument to regno_clobbered_p. 


H.J.