Test cases from Cowlishaw, v2.57. All are pased cleanly.
diff --git a/Lib/test/decimaltestdata/ddMultiply.decTest b/Lib/test/decimaltestdata/ddMultiply.decTest
index 01e0ffe..f506ea2 100644
--- a/Lib/test/decimaltestdata/ddMultiply.decTest
+++ b/Lib/test/decimaltestdata/ddMultiply.decTest
@@ -17,7 +17,7 @@
-- IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK --
-- mfc@uk.ibm.com --
------------------------------------------------------------------------
-version: 2.56
+version: 2.57
-- This set of tests are for decDoubles only; all arguments are
-- representable in a decDouble
@@ -454,9 +454,92 @@
-- hugest
ddmul909 multiply 9999999999999999 9999999999999999 -> 9.999999999999998E+31 Inexact Rounded
+-- power-of-ten edge cases
+ddmul1001 multiply 1 10 -> 10
+ddmul1002 multiply 1 100 -> 100
+ddmul1003 multiply 1 1000 -> 1000
+ddmul1004 multiply 1 10000 -> 10000
+ddmul1005 multiply 1 100000 -> 100000
+ddmul1006 multiply 1 1000000 -> 1000000
+ddmul1007 multiply 1 10000000 -> 10000000
+ddmul1008 multiply 1 100000000 -> 100000000
+ddmul1009 multiply 1 1000000000 -> 1000000000
+ddmul1010 multiply 1 10000000000 -> 10000000000
+ddmul1011 multiply 1 100000000000 -> 100000000000
+ddmul1012 multiply 1 1000000000000 -> 1000000000000
+ddmul1013 multiply 1 10000000000000 -> 10000000000000
+ddmul1014 multiply 1 100000000000000 -> 100000000000000
+ddmul1015 multiply 1 1000000000000000 -> 1000000000000000
+ddmul1021 multiply 10 1 -> 10
+ddmul1022 multiply 10 10 -> 100
+ddmul1023 multiply 10 100 -> 1000
+ddmul1024 multiply 10 1000 -> 10000
+ddmul1025 multiply 10 10000 -> 100000
+ddmul1026 multiply 10 100000 -> 1000000
+ddmul1027 multiply 10 1000000 -> 10000000
+ddmul1028 multiply 10 10000000 -> 100000000
+ddmul1029 multiply 10 100000000 -> 1000000000
+ddmul1030 multiply 10 1000000000 -> 10000000000
+ddmul1031 multiply 10 10000000000 -> 100000000000
+ddmul1032 multiply 10 100000000000 -> 1000000000000
+ddmul1033 multiply 10 1000000000000 -> 10000000000000
+ddmul1034 multiply 10 10000000000000 -> 100000000000000
+ddmul1035 multiply 10 100000000000000 -> 1000000000000000
+ddmul1041 multiply 100 0.1 -> 10.0
+ddmul1042 multiply 100 1 -> 100
+ddmul1043 multiply 100 10 -> 1000
+ddmul1044 multiply 100 100 -> 10000
+ddmul1045 multiply 100 1000 -> 100000
+ddmul1046 multiply 100 10000 -> 1000000
+ddmul1047 multiply 100 100000 -> 10000000
+ddmul1048 multiply 100 1000000 -> 100000000
+ddmul1049 multiply 100 10000000 -> 1000000000
+ddmul1050 multiply 100 100000000 -> 10000000000
+ddmul1051 multiply 100 1000000000 -> 100000000000
+ddmul1052 multiply 100 10000000000 -> 1000000000000
+ddmul1053 multiply 100 100000000000 -> 10000000000000
+ddmul1054 multiply 100 1000000000000 -> 100000000000000
+ddmul1055 multiply 100 10000000000000 -> 1000000000000000
+ddmul1061 multiply 1000 0.01 -> 10.00
+ddmul1062 multiply 1000 0.1 -> 100.0
+ddmul1063 multiply 1000 1 -> 1000
+ddmul1064 multiply 1000 10 -> 10000
+ddmul1065 multiply 1000 100 -> 100000
+ddmul1066 multiply 1000 1000 -> 1000000
+ddmul1067 multiply 1000 10000 -> 10000000
+ddmul1068 multiply 1000 100000 -> 100000000
+ddmul1069 multiply 1000 1000000 -> 1000000000
+ddmul1070 multiply 1000 10000000 -> 10000000000
+ddmul1071 multiply 1000 100000000 -> 100000000000
+ddmul1072 multiply 1000 1000000000 -> 1000000000000
+ddmul1073 multiply 1000 10000000000 -> 10000000000000
+ddmul1074 multiply 1000 100000000000 -> 100000000000000
+ddmul1075 multiply 1000 1000000000000 -> 1000000000000000
+ddmul1081 multiply 10000 0.001 -> 10.000
+ddmul1082 multiply 10000 0.01 -> 100.00
+ddmul1083 multiply 10000 0.1 -> 1000.0
+ddmul1084 multiply 10000 1 -> 10000
+ddmul1085 multiply 10000 10 -> 100000
+ddmul1086 multiply 10000 100 -> 1000000
+ddmul1087 multiply 10000 1000 -> 10000000
+ddmul1088 multiply 10000 10000 -> 100000000
+ddmul1089 multiply 10000 100000 -> 1000000000
+ddmul1090 multiply 10000 1000000 -> 10000000000
+ddmul1091 multiply 10000 10000000 -> 100000000000
+ddmul1092 multiply 10000 100000000 -> 1000000000000
+ddmul1093 multiply 10000 1000000000 -> 10000000000000
+ddmul1094 multiply 10000 10000000000 -> 100000000000000
+ddmul1095 multiply 10000 100000000000 -> 1000000000000000
+
+ddmul1097 multiply 10000 99999999999 -> 999999999990000
+ddmul1098 multiply 10000 99999999999 -> 999999999990000
+
+
+
+
-- Null tests
-ddmul990 multiply 10 # -> NaN Invalid_operation
-ddmul991 multiply # 10 -> NaN Invalid_operation
+ddmul9990 multiply 10 # -> NaN Invalid_operation
+ddmul9991 multiply # 10 -> NaN Invalid_operation