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, 14 insertions, 9 deletions

diff --git a/innobase/row/row0sel.c b/innobase/row/row0sel.c
index 7a5e4cb9264..16e2dc69e0b 100644
--- a/innobase/row/row0sel.c
+++ b/innobase/row/row0sel.c
@@ -79,14 +79,15 @@ row_sel_sec_rec_is_for_clust_rec(
         ulint           i;
 	dtype_t*	cur_type;
 	mem_heap_t*	heap		= NULL;
-	ulint		clust_offsets_[100]
-					= { 100, };
-	ulint		sec_offsets_[10]
-					= { 10, };
+	ulint		clust_offsets_[100];
+	ulint		sec_offsets_[10];
 	ulint*		clust_offs	= clust_offsets_;
 	ulint*		sec_offs	= sec_offsets_;
 	ibool		is_equal	= TRUE;
 
+	*clust_offsets_ = (sizeof clust_offsets_) / sizeof *clust_offsets_;
+	*sec_offsets_ = (sizeof sec_offsets_) / sizeof *sec_offsets_;
+
 	clust_offs = rec_get_offsets(clust_rec, clust_index, clust_offs,
 						ULINT_UNDEFINED, &heap);
 	sec_offs = rec_get_offsets(sec_rec, sec_index, sec_offs,
@@ -625,8 +626,9 @@ row_sel_get_clust_rec(
 	rec_t*		old_vers;
 	ulint		err;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	offsets = rec_get_offsets(rec,
 				btr_pcur_get_btr_cur(&plan->pcur)->index,
@@ -990,9 +992,10 @@ row_sel_try_search_shortcut(
 	dict_index_t*	index;
 	rec_t*		rec;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
 	ulint		ret;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	index = plan->index;
 
@@ -1115,8 +1118,9 @@ row_sel(
 	ulint		found_flag;
 	ulint		err;
 	mem_heap_t*	heap				= NULL;
-	ulint		offsets_[100]			= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets				= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	ut_ad(thr->run_node == node);
 
@@ -3035,9 +3039,10 @@ row_search_for_mysql(
 	ulint		next_offs;
 	mtr_t		mtr;
 	mem_heap_t*	heap				= NULL;
-	ulint		offsets_[100]			= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets				= offsets_;
-	
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
+
 	ut_ad(index && pcur && search_tuple);
 	ut_ad(trx->mysql_thread_id == os_thread_get_curr_id());