[PATCH] Debug counter for IVOPTs

[Richard Biener <rguenther@suse.de>]

Bootstrapped / tested on x86_64-unknwon-linux-gnu, applied.

Richard.

2019-11-08  Richard Biener  <rguenther@suse.de>

	* dbgcnt.def (ivopts_loop): Add.
	* tree-ssa-loop-ivopts.c (tree_ssa_iv_optimize): Check
	ivopts_loop before optimizing a loop.

Index: gcc/dbgcnt.def
===================================================================
--- gcc/dbgcnt.def	(revision 277965)
+++ gcc/dbgcnt.def	(working copy)
@@ -199,3 +199,4 @@ DEBUG_COUNTER (dom_unreachable_edges)
 DEBUG_COUNTER (match)
 DEBUG_COUNTER (store_merging)
 DEBUG_COUNTER (gimple_unroll)
+DEBUG_COUNTER (ivopts_loop)
Index: gcc/tree-ssa-loop-ivopts.c
===================================================================
--- gcc/tree-ssa-loop-ivopts.c	(revision 277965)
+++ gcc/tree-ssa-loop-ivopts.c	(working copy)
@@ -131,6 +131,7 @@ along with GCC; see the file COPYING3.
 #include "tree-ssa-address.h"
 #include "builtins.h"
 #include "tree-vectorizer.h"
+#include "dbgcnt.h"
 
 /* FIXME: Expressions are expanded to RTL in this pass to determine the
    cost of different addressing modes.  This should be moved to a TBD
@@ -8043,6 +8044,9 @@ tree_ssa_iv_optimize (void)
   /* Optimize the loops starting with the innermost ones.  */
   FOR_EACH_LOOP (loop, LI_FROM_INNERMOST)
     {
+      if (!dbg_cnt (ivopts_loop))
+	continue;
+
       if (dump_file && (dump_flags & TDF_DETAILS))
 	flow_loop_dump (loop, dump_file, NULL, 1);