=== modified file 'mysql-test/r/func_math.result'
--- mysql-test/r/func_math.result	2013-09-14 01:09:36 +0000
+++ mysql-test/r/func_math.result	2014-03-14 09:54:50 +0000
@@ -728,6 +728,21 @@ select (1.175494351E-37 div 1.7976931348
 Warnings:
 Warning	1916	Got overflow when converting '' to DECIMAL. Value truncated.
 #
+# Bug#12744991 - DECIMAL_ROUND(X,D) GIVES WRONG RESULTS WHEN D == N*(-9)
+#
+select round(999999999, -9);
+round(999999999, -9)
+1000000000
+select round(999999999.0, -9);
+round(999999999.0, -9)
+1000000000
+select round(999999999999999999, -18);
+round(999999999999999999, -18)
+1000000000000000000
+select round(999999999999999999.0, -18);
+round(999999999999999999.0, -18)
+1000000000000000000
+#
 # Bug#12537160 ASSERTION FAILED:
 # STOP0 <= &TO->BUF[TO->LEN] WITH LARGE NUMBER.
 #

=== modified file 'mysql-test/t/func_math.test'
--- mysql-test/t/func_math.test	2012-05-04 12:02:35 +0000
+++ mysql-test/t/func_math.test	2014-03-14 09:53:36 +0000
@@ -539,6 +539,16 @@ SELECT 1 div null;
 select (1.175494351E-37 div 1.7976931348623157E+308);
 
 --echo #
+--echo # Bug#12744991 - DECIMAL_ROUND(X,D) GIVES WRONG RESULTS WHEN D == N*(-9)
+--echo #
+
+select round(999999999, -9);
+select round(999999999.0, -9);
+select round(999999999999999999, -18);
+select round(999999999999999999.0, -18);
+
+
+--echo #
 --echo # Bug#12537160 ASSERTION FAILED:
 --echo # STOP0 <= &TO->BUF[TO->LEN] WITH LARGE NUMBER.
 --echo #