[PATCH] Come up with debug counter for store-merging.

[Martin Liška]

Hi.

After I spent quite some time with PR91758, I would like
to see a debug counter in store merging for the next time.

Ready to be installed?
Thanks,
Martin

gcc/ChangeLog:

2019-09-18  Martin Liska  <mli...@suse.cz>

        * dbgcnt.def (store_merging): New counter.
        * gimple-ssa-store-merging.c 
(imm_store_chain_info::output_merged_stores):
        Use it in store merging.
---
 gcc/dbgcnt.def                 | 1 +
 gcc/gimple-ssa-store-merging.c | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)



diff --git a/gcc/dbgcnt.def b/gcc/dbgcnt.def
index 230072f7bb5..ef981aa6967 100644
--- a/gcc/dbgcnt.def
+++ b/gcc/dbgcnt.def
@@ -196,3 +196,4 @@ DEBUG_COUNTER (vect_loop)
 DEBUG_COUNTER (vect_slp)
 DEBUG_COUNTER (dom_unreachable_edges)
 DEBUG_COUNTER (match)
+DEBUG_COUNTER (store_merging)
diff --git a/gcc/gimple-ssa-store-merging.c b/gcc/gimple-ssa-store-merging.c
index 0bf64b314d6..5abaa7d18d8 100644
--- a/gcc/gimple-ssa-store-merging.c
+++ b/gcc/gimple-ssa-store-merging.c
@@ -166,6 +166,7 @@
 #include "rtl.h"
 #include "expr.h"	/* For get_bit_range.  */
 #include "optabs-tree.h"
+#include "dbgcnt.h"
 #include "selftest.h"
 
 /* The maximum size (in bits) of the stores this pass should generate.  */
@@ -4195,7 +4196,8 @@ imm_store_chain_info::output_merged_stores ()
   bool ret = false;
   FOR_EACH_VEC_ELT (m_merged_store_groups, i, merged_store)
     {
-      if (output_merged_store (merged_store))
+      if (dbg_cnt (store_merging)
+	  && output_merged_store (merged_store))
 	{
 	  unsigned int j;
 	  store_immediate_info *store;