It seems that just commenting out this check in fwprop.c should work.
/* Do not propagate loop invariant definitions inside the loop. */
/* if (DF_REF_BB (def)->loop_father != DF_REF_BB (use)->loop_father)
return;*/
Bingfeng
> -----Original Message-----
> From: Paolo Bonzini [mailto:paolo.bonz...@gmail.com] On
> Behalf Of Paolo Bonzini
> Sent: 23 December 2009 15:01
> To: Bingfeng Mei
> Cc: Steven Bosscher; gcc@gcc.gnu.org; dber...@dberlin.org
> Subject: Re: Unnecessary PRE optimization
>
> On 12/23/2009 03:27 PM, Bingfeng Mei wrote:
> > Do you mean if TARGET_ADDRES_COST (non-x86) is defined properly,
> > this should be fixed? Or it requires extra patch?
>
> No, if TARGET_ADDRESS_COST was fixed for x86 (and of course defined
> properly for your target), we could fix this very easily.
>
> Paolo
>
>
