InnoDB: Improve performance by about 10% by removing implicit

memcpy() calls, by not initializing the offsets_[] arrays.
InnoDB: Remove a Microsoft compiler warning in page0page.c.


innobase/btr/btr0btr.c:
  Only initialize the first element of offsets_[]
innobase/btr/btr0cur.c:
  Only initialize the first element of offsets_[]
innobase/btr/btr0sea.c:
  Only initialize the first element of offsets_[]
innobase/lock/lock0lock.c:
  Only initialize the first element of offsets_[]
innobase/page/page0cur.c:
  Only initialize the first element of offsets_[]
innobase/page/page0page.c:
  page_validate(): Silence a warning about unsigned/signed comparison.
  Other places: Only initialize the first element of offsets_[].
innobase/rem/rem0rec.c:
  Only initialize the first element of offsets_[]
innobase/row/row0ins.c:
  Only initialize the first element of offsets_[]
innobase/row/row0mysql.c:
  Only initialize the first element of offsets_[]
innobase/row/row0purge.c:
  Only initialize the first element of offsets_[]
innobase/row/row0row.c:
  Only initialize the first element of offsets_[]
innobase/row/row0sel.c:
  Only initialize the first element of offsets_[]
innobase/row/row0undo.c:
  Only initialize the first element of offsets_[]
innobase/row/row0upd.c:
  Only initialize the first element of offsets_[]
innobase/trx/trx0rec.c:
  Only initialize the first element of offsets_[]

1 files changed, 12 insertions, 6 deletions

diff --git a/innobase/btr/btr0sea.c b/innobase/btr/btr0sea.c
index dc712f650e7..5f95937a2cb 100644
--- a/innobase/btr/btr0sea.c
+++ b/innobase/btr/btr0sea.c
@@ -420,7 +420,8 @@ btr_search_update_hash_ref(
 	    && (block->curr_n_bytes == info->n_bytes)
 	    && (block->curr_side == info->side)) {
 		mem_heap_t*	heap		= NULL;
-		ulint		offsets_[100]	= { 100, };
+		ulint		offsets_[100];
+		*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	    	rec = btr_cur_get_rec(cursor);
 
@@ -552,9 +553,10 @@ btr_search_check_guess(
 	ulint		bytes;
 	int		cmp;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
 	ibool		success		= FALSE;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	n_unique = dict_index_get_n_unique_in_tree(cursor->index);
 	
@@ -1098,8 +1100,9 @@ btr_search_build_page_hash_index(
 	rec_t**		recs;
 	ulint		i;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	ut_ad(index);
 
@@ -1341,8 +1344,9 @@ btr_search_update_hash_on_delete(
 	ulint		fold;
 	dulint		tree_id;
 	ibool		found;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	mem_heap_t*	heap		= NULL;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	rec = btr_cur_get_rec(cursor);
 
@@ -1452,8 +1456,9 @@ btr_search_update_hash_on_insert(
 	ulint		side;
 	ibool		locked		= FALSE;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	table = btr_search_sys->hash_index;
 
@@ -1591,8 +1596,9 @@ btr_search_validate(void)
 	ibool		ok		= TRUE;
 	ulint		i;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 	
 	rw_lock_x_lock(&btr_search_latch);