[dataflow]: PATCH: clear DF_LR_RUN_DCE flag after df_analyze in sched-ebb

[Kenneth Zadeck]

Seongbae Park wrote:
> Hi,
>
> This is to fix a regression on ia64 - ia64 machine reorg pass
> inserts many nops, which then get deleted by
> df_analyze() call within ia64_mach_reorg.
> Clear the flag here to prevent any df_analyze() calls
> after sched_ebbs() from accidently triggering DCE.
>
> The same change has been bootstraped and regtested
> before the latest merge with the mainline on dataflow,
> on ia64 and i686.
>
> I've restarted the bootstrap and regtest on ia64.
> OK ?
>
> ChangeLog.dataflow
>
> 2007-02-20  Seongbae Park <seongbae.park@gmail.com>
>
>        * sched-ebb.c (schedule_ebbs): Clear DF_LR_RUN_DCE flag
>        after df_analyze.
>
>
> Index: sched-ebb.c
> ===================================================================
> --- sched-ebb.c (revision 122164)
> +++ sched-ebb.c (working copy)
> @@ -541,6 +541,7 @@ schedule_ebbs (void)
>   df_set_flags (DF_LR_RUN_DCE);
>   df_ri_add_problem (DF_RI_LIFE);
>   df_analyze ();
> +  df_clear_flags (DF_LR_RUN_DCE);
>   sched_init ();
>
>   compute_bb_for_insn ();
ok to check into the dataflow branch.

kenny