Passes uses rather than defs to df_set_dead_notes_for_mw

[Kenneth Zadeck]

this looks right to me.  ok for commit.



On 08/26/2011 09:54 AM, Richard Sandiford wrote:
> As described here:
>
>      http://gcc.gnu.org/ml/gcc/2011-08/msg00294.html
>
> df is currently failing to create REG_DEAD notes for the last use
> of a multi-reg hard register.  This appears to be a typo:
> df_set_dead_notes_for_mw is supposed to handle uses, and the comment
> above it says so, but df_note_bb_compute is passing defs instead.
>
> Bootstrapped&  regression-tested on x86_64-linux-gnu.  OK to install?
>
> Richard
>
>
> gcc/
> 	* df-problems.c (df_note_bb_compute): Pass uses rather than defs
> 	to df_set_dead_notes_for_mw.
>
> Index: gcc/df-problems.c
> ===================================================================
> --- gcc/df-problems.c	2011-08-16 16:27:24.641037124 +0100
> +++ gcc/df-problems.c	2011-08-26 14:48:48.521897439 +0100
> @@ -3376,7 +3376,7 @@ df_note_bb_compute (unsigned int bb_inde
>         while (*mws_rec)
>   	{
>   	  struct df_mw_hardreg *mws = *mws_rec;
> -	  if ((DF_MWS_REG_DEF_P (mws))
> +	  if (DF_MWS_REG_USE_P (mws)
>   	&&  !df_ignore_stack_reg (mws->start_regno))
>   	    {
>   	      bool really_add_notes = debug_insn != 0;