* df-core.c (df_set_blocks): Use bitmap_head instead of bitmap.

	(df_compact_blocks): Likewise.
	* df.h (struct df): Turn hardware_regs_used,
	regular_block_artificial_uses, eh_block_artificial_uses,
	insns_to_delete, insns_to_rescan, insns_to_notes_rescan into
	bitmap_head.
	* df-problems.c (df_lr_local_compute, df_lr_confluence_0,
	df_byte_lr_alloc, df_simulate_fixup_sets): Update.
	* df-scan.c (df_scan_free_internal, df_scan_alloc, df_scan_start_dump,
	df_scan_blocks, df_insn_delete, df_insn_rescan,
	df_insn_rescan_debug_internal, df_insn_rescan_all,
	df_process_deferred_rescans, df_process_deferred_rescans,
	df_notes_rescan, df_get_call_refs, df_get_call_refs,
	regs_invalidated_by_call_regset, df_get_call_refs, df_bb_refs_collect,
	df_record_entry_block_defs, df_record_exit_block_uses,
	df_update_exit_block_uses, df_bb_verify, df_entry_block_bitmap_verify,
	df_scan_verify): Update.


git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@160348 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 7 insertions, 1 deletions

diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c
index 7139e3a7bce..67e5632e6cb 100644
--- a/gcc/cfgcleanup.c
+++ b/gcc/cfgcleanup.c
@@ -2367,7 +2367,13 @@ cleanup_cfg (int mode)
 	    break;
 	  else if ((mode & CLEANUP_CROSSJUMP)
 		   && crossjumps_occured)
-	    run_fast_dce ();
+	    {
+	      /* Fast DCE is expensive, we really want to be sure we don't
+		 re-run it just because crossjumping cascade.  */
+	      while (try_optimize_cfg (mode))
+		delete_unreachable_blocks ();
+	      run_fast_dce ();
+	    }
 	}
       else
 	break;