dbgcnt.def (hoist_insn): New debug counter.

	* dbgcnt.def (hoist_insn): New debug counter.
	* gcse.c (hoist_code): Use it.

From-SVN: r162586

gcc/ChangeLog

+2010-07-27  Maxim Kuvyrkov  <maxim@codesourcery.com>
+
+	* dbgcnt.def (hoist_insn): New debug counter.
+	* gcse.c (hoist_code): Use it.
+
 2010-07-27  Xinliang David Li  <davidxl@google.com>
 
 	* tree-ssa-loop-ivopts.c (niter_for_exit): New parameter.

gcc/dbgcnt.def

@@ -158,6 +158,7 @@ DEBUG_COUNTER (gcse2_delete)
 DEBUG_COUNTER (global_alloc_at_func)
 DEBUG_COUNTER (global_alloc_at_reg)
 DEBUG_COUNTER (hoist)
+DEBUG_COUNTER (hoist_insn)
 DEBUG_COUNTER (ia64_sched2)
 DEBUG_COUNTER (if_conversion)
 DEBUG_COUNTER (if_conversion_tree)

gcc/gcse.c

@@ -4330,7 +4330,7 @@ hoist_code (void)
 		 the vast majority of hoistable expressions are only movable
 		 from two successors, so raising this threshold is likely
 		 to nullify any benefit we get from code hoisting.  */
-	      if (hoistable > 1)
+	      if (hoistable > 1 && dbg_cnt (hoist_insn))
 		{
 		  SET_BIT (hoist_exprs[bb->index], i);
 		  found = 1;