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, 9 insertions, 6 deletions

diff --git a/innobase/row/row0ins.c b/innobase/row/row0ins.c
index 87ed497ba1e..99a74501ade 100644
--- a/innobase/row/row0ins.c
+++ b/innobase/row/row0ins.c
@@ -1134,8 +1134,9 @@ row_ins_check_foreign_constraint(
 	mtr_t		mtr;
 	trx_t*		trx		= thr_get_trx(thr);
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 run_again:
 #ifdef UNIV_SYNC_DEBUG
@@ -1558,8 +1559,9 @@ row_ins_scan_sec_index_for_duplicate(
 	mtr_t		mtr;
 	trx_t*		trx;
 	mem_heap_t*	heap		= NULL;
-	ulint		offsets_[100]	= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets		= offsets_;
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	n_unique = dict_index_get_n_unique(index);
 
@@ -1695,9 +1697,9 @@ row_ins_duplicate_error_in_clust(
 	ulint	n_unique;
 	trx_t*	trx		= thr_get_trx(thr);
 	mem_heap_t*heap		= NULL;
-	ulint	offsets_[100]	= { 100, };
+	ulint	offsets_[100];
 	ulint*	offsets		= offsets_;
-
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
 
 	UT_NOT_USED(mtr);
 	
@@ -1897,9 +1899,10 @@ row_ins_index_entry_low(
 	big_rec_t*	big_rec			= NULL;
 	mtr_t		mtr;
 	mem_heap_t*	heap			= NULL;
-	ulint		offsets_[100]		= { 100, };
+	ulint		offsets_[100];
 	ulint*		offsets			= offsets_;
-	
+	*offsets_ = (sizeof offsets_) / sizeof *offsets_;
+
 	log_free_check();
 
 	mtr_start(&mtr);