Merged the decimal-branch (revisions 54886 to 58140). Decimal is now
fully updated to the latests Decimal Specification (v1.66) and the
latests test cases (v2.56).
Thanks to Mark Dickinson for all his help during this process.
diff --git a/Lib/test/decimaltestdata/copysign.decTest b/Lib/test/decimaltestdata/copysign.decTest
new file mode 100644
index 0000000..6b20fda
--- /dev/null
+++ b/Lib/test/decimaltestdata/copysign.decTest
@@ -0,0 +1,177 @@
+------------------------------------------------------------------------
+-- copysign.decTest -- quiet copy with sign from rhs --
+-- Copyright (c) IBM Corporation, 1981, 2007. All rights reserved. --
+------------------------------------------------------------------------
+-- Please see the document "General Decimal Arithmetic Testcases" --
+-- at http://www2.hursley.ibm.com/decimal for the description of --
+-- these testcases. --
+-- --
+-- These testcases are experimental ('beta' versions), and they --
+-- may contain errors. They are offered on an as-is basis. In --
+-- particular, achieving the same results as the tests here is not --
+-- a guarantee that an implementation complies with any Standard --
+-- or specification. The tests are not exhaustive. --
+-- --
+-- Please send comments, suggestions, and corrections to the author: --
+-- Mike Cowlishaw, IBM Fellow --
+-- IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK --
+-- mfc@uk.ibm.com --
+------------------------------------------------------------------------
+version: 2.56
+
+extended: 1
+precision: 9
+rounding: half_up
+maxExponent: 999
+minExponent: -999
+
+-- Sanity check, and examples from decArith
+cpsx001 copysign +7.50 11 -> 7.50
+cpsx002 copysign '1.50' '7.33' -> 1.50
+cpsx003 copysign '-1.50' '7.33' -> 1.50
+cpsx004 copysign '1.50' '-7.33' -> -1.50
+cpsx005 copysign '-1.50' '-7.33' -> -1.50
+
+-- Infinities
+cpsx011 copysign Infinity 11 -> Infinity
+cpsx012 copysign -Infinity 11 -> Infinity
+
+-- NaNs, 0 payload
+cpsx021 copysign NaN 11 -> NaN
+cpsx022 copysign -NaN 11 -> NaN
+cpsx023 copysign sNaN 11 -> sNaN
+cpsx024 copysign -sNaN 11 -> sNaN
+
+-- NaNs, non-0 payload
+cpsx031 copysign NaN10 11 -> NaN10
+cpsx032 copysign -NaN10 11 -> NaN10
+cpsx033 copysign sNaN10 11 -> sNaN10
+cpsx034 copysign -sNaN10 11 -> sNaN10
+cpsx035 copysign NaN7 11 -> NaN7
+cpsx036 copysign -NaN7 11 -> NaN7
+cpsx037 copysign sNaN101 11 -> sNaN101
+cpsx038 copysign -sNaN101 11 -> sNaN101
+
+-- finites
+cpsx101 copysign 7 11 -> 7
+cpsx102 copysign -7 11 -> 7
+cpsx103 copysign 75 11 -> 75
+cpsx104 copysign -75 11 -> 75
+cpsx105 copysign 7.50 11 -> 7.50
+cpsx106 copysign -7.50 11 -> 7.50
+cpsx107 copysign 7.500 11 -> 7.500
+cpsx108 copysign -7.500 11 -> 7.500
+
+-- zeros
+cpsx111 copysign 0 11 -> 0
+cpsx112 copysign -0 11 -> 0
+cpsx113 copysign 0E+4 11 -> 0E+4
+cpsx114 copysign -0E+4 11 -> 0E+4
+cpsx115 copysign 0.0000 11 -> 0.0000
+cpsx116 copysign -0.0000 11 -> 0.0000
+cpsx117 copysign 0E-141 11 -> 0E-141
+cpsx118 copysign -0E-141 11 -> 0E-141
+
+-- full coefficients, alternating bits
+cpsx121 copysign 268268268 11 -> 268268268
+cpsx122 copysign -268268268 11 -> 268268268
+cpsx123 copysign 134134134 11 -> 134134134
+cpsx124 copysign -134134134 11 -> 134134134
+
+-- Nmax, Nmin, Ntiny
+cpsx131 copysign 9.99999999E+999 11 -> 9.99999999E+999
+cpsx132 copysign 1E-999 11 -> 1E-999
+cpsx133 copysign 1.00000000E-999 11 -> 1.00000000E-999
+cpsx134 copysign 1E-1007 11 -> 1E-1007
+
+cpsx135 copysign -1E-1007 11 -> 1E-1007
+cpsx136 copysign -1.00000000E-999 11 -> 1.00000000E-999
+cpsx137 copysign -1E-999 11 -> 1E-999
+cpsx138 copysign -9.99999999E+999 11 -> 9.99999999E+999
+
+-- repeat with negative RHS
+
+-- Infinities
+cpsx211 copysign Infinity -34 -> -Infinity
+cpsx212 copysign -Infinity -34 -> -Infinity
+
+-- NaNs, 0 payload
+cpsx221 copysign NaN -34 -> -NaN
+cpsx222 copysign -NaN -34 -> -NaN
+cpsx223 copysign sNaN -34 -> -sNaN
+cpsx224 copysign -sNaN -34 -> -sNaN
+
+-- NaNs, non-0 payload
+cpsx231 copysign NaN10 -34 -> -NaN10
+cpsx232 copysign -NaN10 -34 -> -NaN10
+cpsx233 copysign sNaN10 -34 -> -sNaN10
+cpsx234 copysign -sNaN10 -34 -> -sNaN10
+cpsx235 copysign NaN7 -34 -> -NaN7
+cpsx236 copysign -NaN7 -34 -> -NaN7
+cpsx237 copysign sNaN101 -34 -> -sNaN101
+cpsx238 copysign -sNaN101 -34 -> -sNaN101
+
+-- finites
+cpsx301 copysign 7 -34 -> -7
+cpsx302 copysign -7 -34 -> -7
+cpsx303 copysign 75 -34 -> -75
+cpsx304 copysign -75 -34 -> -75
+cpsx305 copysign 7.50 -34 -> -7.50
+cpsx306 copysign -7.50 -34 -> -7.50
+cpsx307 copysign 7.500 -34 -> -7.500
+cpsx308 copysign -7.500 -34 -> -7.500
+
+-- zeros
+cpsx311 copysign 0 -34 -> -0
+cpsx312 copysign -0 -34 -> -0
+cpsx313 copysign 0E+4 -34 -> -0E+4
+cpsx314 copysign -0E+4 -34 -> -0E+4
+cpsx315 copysign 0.0000 -34 -> -0.0000
+cpsx316 copysign -0.0000 -34 -> -0.0000
+cpsx317 copysign 0E-141 -34 -> -0E-141
+cpsx318 copysign -0E-141 -34 -> -0E-141
+
+-- full coefficients, alternating bits
+cpsx321 copysign 268268268 -18 -> -268268268
+cpsx322 copysign -268268268 -18 -> -268268268
+cpsx323 copysign 134134134 -18 -> -134134134
+cpsx324 copysign -134134134 -18 -> -134134134
+
+-- Nmax, Nmin, Ntiny
+cpsx331 copysign 9.99999999E+999 -18 -> -9.99999999E+999
+cpsx332 copysign 1E-999 -18 -> -1E-999
+cpsx333 copysign 1.00000000E-999 -18 -> -1.00000000E-999
+cpsx334 copysign 1E-1007 -18 -> -1E-1007
+
+cpsx335 copysign -1E-1007 -18 -> -1E-1007
+cpsx336 copysign -1.00000000E-999 -18 -> -1.00000000E-999
+cpsx337 copysign -1E-999 -18 -> -1E-999
+cpsx338 copysign -9.99999999E+999 -18 -> -9.99999999E+999
+
+-- Other kinds of RHS
+cpsx401 copysign 701 -34 -> -701
+cpsx402 copysign -720 -34 -> -720
+cpsx403 copysign 701 -0 -> -701
+cpsx404 copysign -720 -0 -> -720
+cpsx405 copysign 701 +0 -> 701
+cpsx406 copysign -720 +0 -> 720
+cpsx407 copysign 701 +34 -> 701
+cpsx408 copysign -720 +34 -> 720
+
+cpsx413 copysign 701 -Inf -> -701
+cpsx414 copysign -720 -Inf -> -720
+cpsx415 copysign 701 +Inf -> 701
+cpsx416 copysign -720 +Inf -> 720
+
+cpsx420 copysign 701 -NaN -> -701
+cpsx421 copysign -720 -NaN -> -720
+cpsx422 copysign 701 +NaN -> 701
+cpsx423 copysign -720 +NaN -> 720
+cpsx425 copysign -720 +NaN8 -> 720
+
+cpsx426 copysign 701 -sNaN -> -701
+cpsx427 copysign -720 -sNaN -> -720
+cpsx428 copysign 701 +sNaN -> 701
+cpsx429 copysign -720 +sNaN -> 720
+cpsx430 copysign -720 +sNaN3 -> 720
+