Add likely/unlikely to speed up execution

Added to:
- if (error)
- Lex
- sql_yacc.yy and sql_yacc_ora.yy
- In header files to alloc() calls
- Added thd argument to thd_net_is_killed()

1 files changed, 3 insertions, 3 deletions

diff --git a/sql/group_by_handler.cc b/sql/group_by_handler.cc
index e75800d8986..c92df8922ce 100644
--- a/sql/group_by_handler.cc
+++ b/sql/group_by_handler.cc
@@ -63,7 +63,7 @@ int Pushdown_query::execute(JOIN *join)
 
   while (!(err= handler->next_row()))
   {
-    if (thd->check_killed())
+    if (unlikely(thd->check_killed()))
     {
       thd->send_kill_message();
       handler->end_scan();
@@ -78,7 +78,7 @@ int Pushdown_query::execute(JOIN *join)
         if ((err= table->file->ha_write_tmp_row(table->record[0])))
         {
           bool is_duplicate;
-          if (!table->file->is_fatal_error(err, HA_CHECK_DUP))
+          if (likely(!table->file->is_fatal_error(err, HA_CHECK_DUP)))
             continue;                           // Distinct elimination
 
           if (create_internal_tmp_table_from_heap(thd, table,
@@ -98,7 +98,7 @@ int Pushdown_query::execute(JOIN *join)
         {
           int error;
           /* result < 0 if row was not accepted and should not be counted */
-          if ((error= join->result->send_data(*join->fields)))
+          if (unlikely((error= join->result->send_data(*join->fields))))
           {
             handler->end_scan();
             DBUG_RETURN(error < 0 ? 0 : -1);