> -Original Message-
> From: Eric Botcazou [mailto:ebotca...@adacore.com]
> Sent: 28 November 2013 11:27
> To: Paulo Matos
> Cc: gcc@gcc.gnu.org
> Subject: Re: reg_nonzero_bits_for_combine misunderstood
>
> > Right, didn't notice nonzero_sign_valid
> Right, didn't notice nonzero_sign_valid below. I think restricting mode ==
> last_set_mode is too restrictive.
>
> nonzero_bits is still valid if the new mode has less precision than the old
> mode.
Sure, but I'm not suggesting to restrict anything, quite the contrary:
{
unsigned HOS
> -Original Message-
> From: Eric Botcazou [mailto:ebotca...@adacore.com]
> Sent: 27 November 2013 18:27
> To: Paulo Matos
> Cc: gcc@gcc.gnu.org
> Subject: Re: reg_nonzero_bits_for_combine misunderstood
>
> > But the problem is that if the mode of the regis
> But the problem is that if the mode of the register is larger than the mode
> of the register when last set then we can't know anything about
> nonzero_bits.
Right, this case is handled for nonzero_sign_valid a few lines below.
> Fixed the problem. Any comments?
Why not duplicate the treatmen
