re PR rtl-optimization/57268 (c nested loops hang compiler in sched-deps.c)

	PR rtl-optimization/57268
	* sched-deps.c (sched_analyze_2): Don't flush_pedning_lists
	if DEBUG_INSN_P (insn).

	Reapply
	2013-05-31  Dinar Temirbulatov  <dinar@kugelworks.com>

	PR rtl-optimization/57268
	* sched-deps.c (sched_analyze_2): Flush dependence lists if
	the sum of the read and write lists exceeds MAX_PENDING_LIST_LENGTH.

From-SVN: r199615

gcc/ChangeLog

+2013-06-03  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/57268
+	* sched-deps.c (sched_analyze_2): Don't flush_pedning_lists
+	if DEBUG_INSN_P (insn).
+
+	Reapply
+	2013-05-31  Dinar Temirbulatov  <dinar@kugelworks.com>
+
+	PR rtl-optimization/57268
+	* sched-deps.c (sched_analyze_2): Flush dependence lists if
+	the sum of the read and write lists exceeds MAX_PENDING_LIST_LENGTH.
+
 2013-06-03  Yuri Rumyantsev  <yuri.s.rumyantsev@intel.com>
 
 	* config/i386/i386.c (ix86_lea_outperforms): Fix formatting.

gcc/sched-deps.c

@@ -2690,8 +2690,15 @@ sched_analyze_2 (struct deps_desc *deps, rtx x, rtx insn)
 
 	/* Always add these dependencies to pending_reads, since
 	   this insn may be followed by a write.  */
-        if (!deps->readonly)
-          add_insn_mem_dependence (deps, true, insn, x);
+	if (!deps->readonly)
+	  {
+	    if ((deps->pending_read_list_length
+		 + deps->pending_write_list_length)
+		> MAX_PENDING_LIST_LENGTH
+		&& !DEBUG_INSN_P (insn))
+	      flush_pending_lists (deps, insn, true, true);
+	    add_insn_mem_dependence (deps, true, insn, x);
+	  }
 
 	sched_analyze_2 (deps, XEXP (x, 0), insn);