Kenneth Zadeck - Re: [dataflow]: PATCH: clear DF_LR_RUN_DCE flag after df_analyze in sch (original) (raw)

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• From: Kenneth Zadeck
• To: Seongbae Park
• Cc: gcc-patches
• Date: Tue, 20 Feb 2007 09:48:23 -0500
• Subject: Re: [dataflow]: PATCH: clear DF_LR_RUN_DCE flag after df_analyze in sched-ebb
• References: <ab3a61990702200646w3b729176ga3c166a4eee86f4a@mail.gmail.com>

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

• References:
  • [dataflow]: PATCH: clear DF_LR_RUN_DCE flag after df_analyze in sched-ebb
    * From: Seongbae Park