--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/python-2.5.2/win32/Lib/test/decimaltestdata/subtract.decTest Fri Apr 03 17:19:34 2009 +0100
@@ -0,0 +1,873 @@
+------------------------------------------------------------------------
+-- subtract.decTest -- decimal subtraction --
+-- 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: 2.57
+
+extended: 1
+precision: 9
+rounding: half_up
+maxExponent: 384
+minexponent: -383
+
+-- [first group are 'quick confidence check']
+subx001 subtract 0 0 -> '0'
+subx002 subtract 1 1 -> '0'
+subx003 subtract 1 2 -> '-1'
+subx004 subtract 2 1 -> '1'
+subx005 subtract 2 2 -> '0'
+subx006 subtract 3 2 -> '1'
+subx007 subtract 2 3 -> '-1'
+
+subx011 subtract -0 0 -> '-0'
+subx012 subtract -1 1 -> '-2'
+subx013 subtract -1 2 -> '-3'
+subx014 subtract -2 1 -> '-3'
+subx015 subtract -2 2 -> '-4'
+subx016 subtract -3 2 -> '-5'
+subx017 subtract -2 3 -> '-5'
+
+subx021 subtract 0 -0 -> '0'
+subx022 subtract 1 -1 -> '2'
+subx023 subtract 1 -2 -> '3'
+subx024 subtract 2 -1 -> '3'
+subx025 subtract 2 -2 -> '4'
+subx026 subtract 3 -2 -> '5'
+subx027 subtract 2 -3 -> '5'
+
+subx030 subtract 11 1 -> 10
+subx031 subtract 10 1 -> 9
+subx032 subtract 9 1 -> 8
+subx033 subtract 1 1 -> 0
+subx034 subtract 0 1 -> -1
+subx035 subtract -1 1 -> -2
+subx036 subtract -9 1 -> -10
+subx037 subtract -10 1 -> -11
+subx038 subtract -11 1 -> -12
+
+subx040 subtract '5.75' '3.3' -> '2.45'
+subx041 subtract '5' '-3' -> '8'
+subx042 subtract '-5' '-3' -> '-2'
+subx043 subtract '-7' '2.5' -> '-9.5'
+subx044 subtract '0.7' '0.3' -> '0.4'
+subx045 subtract '1.3' '0.3' -> '1.0'
+subx046 subtract '1.25' '1.25' -> '0.00'
+
+subx050 subtract '1.23456789' '1.00000000' -> '0.23456789'
+subx051 subtract '1.23456789' '1.00000089' -> '0.23456700'
+subx052 subtract '0.5555555559' '0.0000000001' -> '0.555555556' Inexact Rounded
+subx053 subtract '0.5555555559' '0.0000000005' -> '0.555555555' Inexact Rounded
+subx054 subtract '0.4444444444' '0.1111111111' -> '0.333333333' Inexact Rounded
+subx055 subtract '1.0000000000' '0.00000001' -> '0.999999990' Rounded
+subx056 subtract '0.4444444444999' '0' -> '0.444444444' Inexact Rounded
+subx057 subtract '0.4444444445000' '0' -> '0.444444445' Inexact Rounded
+
+subx060 subtract '70' '10000e+9' -> '-1.00000000E+13' Inexact Rounded
+subx061 subtract '700' '10000e+9' -> '-1.00000000E+13' Inexact Rounded
+subx062 subtract '7000' '10000e+9' -> '-9.99999999E+12' Inexact Rounded
+subx063 subtract '70000' '10000e+9' -> '-9.99999993E+12' Rounded
+subx064 subtract '700000' '10000e+9' -> '-9.99999930E+12' Rounded
+ -- symmetry:
+subx065 subtract '10000e+9' '70' -> '1.00000000E+13' Inexact Rounded
+subx066 subtract '10000e+9' '700' -> '1.00000000E+13' Inexact Rounded
+subx067 subtract '10000e+9' '7000' -> '9.99999999E+12' Inexact Rounded
+subx068 subtract '10000e+9' '70000' -> '9.99999993E+12' Rounded
+subx069 subtract '10000e+9' '700000' -> '9.99999930E+12' Rounded
+
+ -- change precision
+subx080 subtract '10000e+9' '70000' -> '9.99999993E+12' Rounded
+precision: 6
+subx081 subtract '10000e+9' '70000' -> '1.00000E+13' Inexact Rounded
+precision: 9
+
+ -- some of the next group are really constructor tests
+subx090 subtract '00.0' '0.0' -> '0.0'
+subx091 subtract '00.0' '0.00' -> '0.00'
+subx092 subtract '0.00' '00.0' -> '0.00'
+subx093 subtract '00.0' '0.00' -> '0.00'
+subx094 subtract '0.00' '00.0' -> '0.00'
+subx095 subtract '3' '.3' -> '2.7'
+subx096 subtract '3.' '.3' -> '2.7'
+subx097 subtract '3.0' '.3' -> '2.7'
+subx098 subtract '3.00' '.3' -> '2.70'
+subx099 subtract '3' '3' -> '0'
+subx100 subtract '3' '+3' -> '0'
+subx101 subtract '3' '-3' -> '6'
+subx102 subtract '3' '0.3' -> '2.7'
+subx103 subtract '3.' '0.3' -> '2.7'
+subx104 subtract '3.0' '0.3' -> '2.7'
+subx105 subtract '3.00' '0.3' -> '2.70'
+subx106 subtract '3' '3.0' -> '0.0'
+subx107 subtract '3' '+3.0' -> '0.0'
+subx108 subtract '3' '-3.0' -> '6.0'
+
+-- the above all from add; massaged and extended. Now some new ones...
+-- [particularly important for comparisons]
+-- NB: -xE-8 below were non-exponents pre-ANSI X3-274, and -1E-7 or 0E-7
+-- with input rounding.
+subx120 subtract '10.23456784' '10.23456789' -> '-5E-8'
+subx121 subtract '10.23456785' '10.23456789' -> '-4E-8'
+subx122 subtract '10.23456786' '10.23456789' -> '-3E-8'
+subx123 subtract '10.23456787' '10.23456789' -> '-2E-8'
+subx124 subtract '10.23456788' '10.23456789' -> '-1E-8'
+subx125 subtract '10.23456789' '10.23456789' -> '0E-8'
+subx126 subtract '10.23456790' '10.23456789' -> '1E-8'
+subx127 subtract '10.23456791' '10.23456789' -> '2E-8'
+subx128 subtract '10.23456792' '10.23456789' -> '3E-8'
+subx129 subtract '10.23456793' '10.23456789' -> '4E-8'
+subx130 subtract '10.23456794' '10.23456789' -> '5E-8'
+subx131 subtract '10.23456781' '10.23456786' -> '-5E-8'
+subx132 subtract '10.23456782' '10.23456786' -> '-4E-8'
+subx133 subtract '10.23456783' '10.23456786' -> '-3E-8'
+subx134 subtract '10.23456784' '10.23456786' -> '-2E-8'
+subx135 subtract '10.23456785' '10.23456786' -> '-1E-8'
+subx136 subtract '10.23456786' '10.23456786' -> '0E-8'
+subx137 subtract '10.23456787' '10.23456786' -> '1E-8'
+subx138 subtract '10.23456788' '10.23456786' -> '2E-8'
+subx139 subtract '10.23456789' '10.23456786' -> '3E-8'
+subx140 subtract '10.23456790' '10.23456786' -> '4E-8'
+subx141 subtract '10.23456791' '10.23456786' -> '5E-8'
+subx142 subtract '1' '0.999999999' -> '1E-9'
+subx143 subtract '0.999999999' '1' -> '-1E-9'
+subx144 subtract '-10.23456780' '-10.23456786' -> '6E-8'
+subx145 subtract '-10.23456790' '-10.23456786' -> '-4E-8'
+subx146 subtract '-10.23456791' '-10.23456786' -> '-5E-8'
+
+precision: 3
+subx150 subtract '12345678900000' '9999999999999' -> 2.35E+12 Inexact Rounded
+subx151 subtract '9999999999999' '12345678900000' -> -2.35E+12 Inexact Rounded
+precision: 6
+subx152 subtract '12345678900000' '9999999999999' -> 2.34568E+12 Inexact Rounded
+subx153 subtract '9999999999999' '12345678900000' -> -2.34568E+12 Inexact Rounded
+precision: 9
+subx154 subtract '12345678900000' '9999999999999' -> 2.34567890E+12 Inexact Rounded
+subx155 subtract '9999999999999' '12345678900000' -> -2.34567890E+12 Inexact Rounded
+precision: 12
+subx156 subtract '12345678900000' '9999999999999' -> 2.34567890000E+12 Inexact Rounded
+subx157 subtract '9999999999999' '12345678900000' -> -2.34567890000E+12 Inexact Rounded
+precision: 15
+subx158 subtract '12345678900000' '9999999999999' -> 2345678900001
+subx159 subtract '9999999999999' '12345678900000' -> -2345678900001
+precision: 9
+
+-- additional scaled arithmetic tests [0.97 problem]
+subx160 subtract '0' '.1' -> '-0.1'
+subx161 subtract '00' '.97983' -> '-0.97983'
+subx162 subtract '0' '.9' -> '-0.9'
+subx163 subtract '0' '0.102' -> '-0.102'
+subx164 subtract '0' '.4' -> '-0.4'
+subx165 subtract '0' '.307' -> '-0.307'
+subx166 subtract '0' '.43822' -> '-0.43822'
+subx167 subtract '0' '.911' -> '-0.911'
+subx168 subtract '.0' '.02' -> '-0.02'
+subx169 subtract '00' '.392' -> '-0.392'
+subx170 subtract '0' '.26' -> '-0.26'
+subx171 subtract '0' '0.51' -> '-0.51'
+subx172 subtract '0' '.2234' -> '-0.2234'
+subx173 subtract '0' '.2' -> '-0.2'
+subx174 subtract '.0' '.0008' -> '-0.0008'
+-- 0. on left
+subx180 subtract '0.0' '-.1' -> '0.1'
+subx181 subtract '0.00' '-.97983' -> '0.97983'
+subx182 subtract '0.0' '-.9' -> '0.9'
+subx183 subtract '0.0' '-0.102' -> '0.102'
+subx184 subtract '0.0' '-.4' -> '0.4'
+subx185 subtract '0.0' '-.307' -> '0.307'
+subx186 subtract '0.0' '-.43822' -> '0.43822'
+subx187 subtract '0.0' '-.911' -> '0.911'
+subx188 subtract '0.0' '-.02' -> '0.02'
+subx189 subtract '0.00' '-.392' -> '0.392'
+subx190 subtract '0.0' '-.26' -> '0.26'
+subx191 subtract '0.0' '-0.51' -> '0.51'
+subx192 subtract '0.0' '-.2234' -> '0.2234'
+subx193 subtract '0.0' '-.2' -> '0.2'
+subx194 subtract '0.0' '-.0008' -> '0.0008'
+-- negatives of same
+subx200 subtract '0' '-.1' -> '0.1'
+subx201 subtract '00' '-.97983' -> '0.97983'
+subx202 subtract '0' '-.9' -> '0.9'
+subx203 subtract '0' '-0.102' -> '0.102'
+subx204 subtract '0' '-.4' -> '0.4'
+subx205 subtract '0' '-.307' -> '0.307'
+subx206 subtract '0' '-.43822' -> '0.43822'
+subx207 subtract '0' '-.911' -> '0.911'
+subx208 subtract '.0' '-.02' -> '0.02'
+subx209 subtract '00' '-.392' -> '0.392'
+subx210 subtract '0' '-.26' -> '0.26'
+subx211 subtract '0' '-0.51' -> '0.51'
+subx212 subtract '0' '-.2234' -> '0.2234'
+subx213 subtract '0' '-.2' -> '0.2'
+subx214 subtract '.0' '-.0008' -> '0.0008'
+
+-- more fixed, LHS swaps [really the same as testcases under add]
+subx220 subtract '-56267E-12' 0 -> '-5.6267E-8'
+subx221 subtract '-56267E-11' 0 -> '-5.6267E-7'
+subx222 subtract '-56267E-10' 0 -> '-0.0000056267'
+subx223 subtract '-56267E-9' 0 -> '-0.000056267'
+subx224 subtract '-56267E-8' 0 -> '-0.00056267'
+subx225 subtract '-56267E-7' 0 -> '-0.0056267'
+subx226 subtract '-56267E-6' 0 -> '-0.056267'
+subx227 subtract '-56267E-5' 0 -> '-0.56267'
+subx228 subtract '-56267E-2' 0 -> '-562.67'
+subx229 subtract '-56267E-1' 0 -> '-5626.7'
+subx230 subtract '-56267E-0' 0 -> '-56267'
+-- symmetry ...
+subx240 subtract 0 '-56267E-12' -> '5.6267E-8'
+subx241 subtract 0 '-56267E-11' -> '5.6267E-7'
+subx242 subtract 0 '-56267E-10' -> '0.0000056267'
+subx243 subtract 0 '-56267E-9' -> '0.000056267'
+subx244 subtract 0 '-56267E-8' -> '0.00056267'
+subx245 subtract 0 '-56267E-7' -> '0.0056267'
+subx246 subtract 0 '-56267E-6' -> '0.056267'
+subx247 subtract 0 '-56267E-5' -> '0.56267'
+subx248 subtract 0 '-56267E-2' -> '562.67'
+subx249 subtract 0 '-56267E-1' -> '5626.7'
+subx250 subtract 0 '-56267E-0' -> '56267'
+
+-- now some more from the 'new' add
+precision: 9
+subx301 subtract '1.23456789' '1.00000000' -> '0.23456789'
+subx302 subtract '1.23456789' '1.00000011' -> '0.23456778'
+
+subx311 subtract '0.4444444444' '0.5555555555' -> '-0.111111111' Inexact Rounded
+subx312 subtract '0.4444444440' '0.5555555555' -> '-0.111111112' Inexact Rounded
+subx313 subtract '0.4444444444' '0.5555555550' -> '-0.111111111' Inexact Rounded
+subx314 subtract '0.44444444449' '0' -> '0.444444444' Inexact Rounded
+subx315 subtract '0.444444444499' '0' -> '0.444444444' Inexact Rounded
+subx316 subtract '0.4444444444999' '0' -> '0.444444444' Inexact Rounded
+subx317 subtract '0.4444444445000' '0' -> '0.444444445' Inexact Rounded
+subx318 subtract '0.4444444445001' '0' -> '0.444444445' Inexact Rounded
+subx319 subtract '0.444444444501' '0' -> '0.444444445' Inexact Rounded
+subx320 subtract '0.44444444451' '0' -> '0.444444445' Inexact Rounded
+
+-- some carrying effects
+subx321 subtract '0.9998' '0.0000' -> '0.9998'
+subx322 subtract '0.9998' '0.0001' -> '0.9997'
+subx323 subtract '0.9998' '0.0002' -> '0.9996'
+subx324 subtract '0.9998' '0.0003' -> '0.9995'
+subx325 subtract '0.9998' '-0.0000' -> '0.9998'
+subx326 subtract '0.9998' '-0.0001' -> '0.9999'
+subx327 subtract '0.9998' '-0.0002' -> '1.0000'
+subx328 subtract '0.9998' '-0.0003' -> '1.0001'
+
+subx330 subtract '70' '10000e+9' -> '-1.00000000E+13' Inexact Rounded
+subx331 subtract '700' '10000e+9' -> '-1.00000000E+13' Inexact Rounded
+subx332 subtract '7000' '10000e+9' -> '-9.99999999E+12' Inexact Rounded
+subx333 subtract '70000' '10000e+9' -> '-9.99999993E+12' Rounded
+subx334 subtract '700000' '10000e+9' -> '-9.99999930E+12' Rounded
+subx335 subtract '7000000' '10000e+9' -> '-9.99999300E+12' Rounded
+-- symmetry:
+subx340 subtract '10000e+9' '70' -> '1.00000000E+13' Inexact Rounded
+subx341 subtract '10000e+9' '700' -> '1.00000000E+13' Inexact Rounded
+subx342 subtract '10000e+9' '7000' -> '9.99999999E+12' Inexact Rounded
+subx343 subtract '10000e+9' '70000' -> '9.99999993E+12' Rounded
+subx344 subtract '10000e+9' '700000' -> '9.99999930E+12' Rounded
+subx345 subtract '10000e+9' '7000000' -> '9.99999300E+12' Rounded
+
+-- same, higher precision
+precision: 15
+subx346 subtract '10000e+9' '7' -> '9999999999993'
+subx347 subtract '10000e+9' '70' -> '9999999999930'
+subx348 subtract '10000e+9' '700' -> '9999999999300'
+subx349 subtract '10000e+9' '7000' -> '9999999993000'
+subx350 subtract '10000e+9' '70000' -> '9999999930000'
+subx351 subtract '10000e+9' '700000' -> '9999999300000'
+subx352 subtract '7' '10000e+9' -> '-9999999999993'
+subx353 subtract '70' '10000e+9' -> '-9999999999930'
+subx354 subtract '700' '10000e+9' -> '-9999999999300'
+subx355 subtract '7000' '10000e+9' -> '-9999999993000'
+subx356 subtract '70000' '10000e+9' -> '-9999999930000'
+subx357 subtract '700000' '10000e+9' -> '-9999999300000'
+
+-- zero preservation
+precision: 6
+subx360 subtract '10000e+9' '70000' -> '1.00000E+13' Inexact Rounded
+subx361 subtract 1 '0.0001' -> '0.9999'
+subx362 subtract 1 '0.00001' -> '0.99999'
+subx363 subtract 1 '0.000001' -> '0.999999'
+subx364 subtract 1 '0.0000001' -> '1.00000' Inexact Rounded
+subx365 subtract 1 '0.00000001' -> '1.00000' Inexact Rounded
+
+-- some funny zeros [in case of bad signum]
+subx370 subtract 1 0 -> 1
+subx371 subtract 1 0. -> 1
+subx372 subtract 1 .0 -> 1.0
+subx373 subtract 1 0.0 -> 1.0
+subx374 subtract 0 1 -> -1
+subx375 subtract 0. 1 -> -1
+subx376 subtract .0 1 -> -1.0
+subx377 subtract 0.0 1 -> -1.0
+
+precision: 9
+
+-- leading 0 digit before round
+subx910 subtract -103519362 -51897955.3 -> -51621406.7
+subx911 subtract 159579.444 89827.5229 -> 69751.9211
+
+subx920 subtract 333.123456 33.1234566 -> 299.999999 Inexact Rounded
+subx921 subtract 333.123456 33.1234565 -> 300.000000 Inexact Rounded
+subx922 subtract 133.123456 33.1234565 -> 99.9999995
+subx923 subtract 133.123456 33.1234564 -> 99.9999996
+subx924 subtract 133.123456 33.1234540 -> 100.000002 Rounded
+subx925 subtract 133.123456 43.1234560 -> 90.0000000
+subx926 subtract 133.123456 43.1234561 -> 89.9999999
+subx927 subtract 133.123456 43.1234566 -> 89.9999994
+subx928 subtract 101.123456 91.1234566 -> 9.9999994
+subx929 subtract 101.123456 99.1234566 -> 1.9999994
+
+-- more of the same; probe for cluster boundary problems
+precision: 1
+subx930 subtract 11 2 -> 9
+precision: 2
+subx932 subtract 101 2 -> 99
+precision: 3
+subx934 subtract 101 2.1 -> 98.9
+subx935 subtract 101 92.01 -> 8.99
+precision: 4
+subx936 subtract 101 2.01 -> 98.99
+subx937 subtract 101 92.01 -> 8.99
+subx938 subtract 101 92.006 -> 8.994
+precision: 5
+subx939 subtract 101 2.001 -> 98.999
+subx940 subtract 101 92.001 -> 8.999
+subx941 subtract 101 92.0006 -> 8.9994
+precision: 6
+subx942 subtract 101 2.0001 -> 98.9999
+subx943 subtract 101 92.0001 -> 8.9999
+subx944 subtract 101 92.00006 -> 8.99994
+precision: 7
+subx945 subtract 101 2.00001 -> 98.99999
+subx946 subtract 101 92.00001 -> 8.99999
+subx947 subtract 101 92.000006 -> 8.999994
+precision: 8
+subx948 subtract 101 2.000001 -> 98.999999
+subx949 subtract 101 92.000001 -> 8.999999
+subx950 subtract 101 92.0000006 -> 8.9999994
+precision: 9
+subx951 subtract 101 2.0000001 -> 98.9999999
+subx952 subtract 101 92.0000001 -> 8.9999999
+subx953 subtract 101 92.00000006 -> 8.99999994
+
+precision: 9
+
+-- more LHS swaps [were fixed]
+subx390 subtract '-56267E-10' 0 -> '-0.0000056267'
+subx391 subtract '-56267E-6' 0 -> '-0.056267'
+subx392 subtract '-56267E-5' 0 -> '-0.56267'
+subx393 subtract '-56267E-4' 0 -> '-5.6267'
+subx394 subtract '-56267E-3' 0 -> '-56.267'
+subx395 subtract '-56267E-2' 0 -> '-562.67'
+subx396 subtract '-56267E-1' 0 -> '-5626.7'
+subx397 subtract '-56267E-0' 0 -> '-56267'
+subx398 subtract '-5E-10' 0 -> '-5E-10'
+subx399 subtract '-5E-7' 0 -> '-5E-7'
+subx400 subtract '-5E-6' 0 -> '-0.000005'
+subx401 subtract '-5E-5' 0 -> '-0.00005'
+subx402 subtract '-5E-4' 0 -> '-0.0005'
+subx403 subtract '-5E-1' 0 -> '-0.5'
+subx404 subtract '-5E0' 0 -> '-5'
+subx405 subtract '-5E1' 0 -> '-50'
+subx406 subtract '-5E5' 0 -> '-500000'
+subx407 subtract '-5E8' 0 -> '-500000000'
+subx408 subtract '-5E9' 0 -> '-5.00000000E+9' Rounded
+subx409 subtract '-5E10' 0 -> '-5.00000000E+10' Rounded
+subx410 subtract '-5E11' 0 -> '-5.00000000E+11' Rounded
+subx411 subtract '-5E100' 0 -> '-5.00000000E+100' Rounded
+
+-- more RHS swaps [were fixed]
+subx420 subtract 0 '-56267E-10' -> '0.0000056267'
+subx421 subtract 0 '-56267E-6' -> '0.056267'
+subx422 subtract 0 '-56267E-5' -> '0.56267'
+subx423 subtract 0 '-56267E-4' -> '5.6267'
+subx424 subtract 0 '-56267E-3' -> '56.267'
+subx425 subtract 0 '-56267E-2' -> '562.67'
+subx426 subtract 0 '-56267E-1' -> '5626.7'
+subx427 subtract 0 '-56267E-0' -> '56267'
+subx428 subtract 0 '-5E-10' -> '5E-10'
+subx429 subtract 0 '-5E-7' -> '5E-7'
+subx430 subtract 0 '-5E-6' -> '0.000005'
+subx431 subtract 0 '-5E-5' -> '0.00005'
+subx432 subtract 0 '-5E-4' -> '0.0005'
+subx433 subtract 0 '-5E-1' -> '0.5'
+subx434 subtract 0 '-5E0' -> '5'
+subx435 subtract 0 '-5E1' -> '50'
+subx436 subtract 0 '-5E5' -> '500000'
+subx437 subtract 0 '-5E8' -> '500000000'
+subx438 subtract 0 '-5E9' -> '5.00000000E+9' Rounded
+subx439 subtract 0 '-5E10' -> '5.00000000E+10' Rounded
+subx440 subtract 0 '-5E11' -> '5.00000000E+11' Rounded
+subx441 subtract 0 '-5E100' -> '5.00000000E+100' Rounded
+
+
+-- try borderline precision, with carries, etc.
+precision: 15
+subx461 subtract '1E+12' '1' -> '999999999999'
+subx462 subtract '1E+12' '-1.11' -> '1000000000001.11'
+subx463 subtract '1.11' '-1E+12' -> '1000000000001.11'
+subx464 subtract '-1' '-1E+12' -> '999999999999'
+subx465 subtract '7E+12' '1' -> '6999999999999'
+subx466 subtract '7E+12' '-1.11' -> '7000000000001.11'
+subx467 subtract '1.11' '-7E+12' -> '7000000000001.11'
+subx468 subtract '-1' '-7E+12' -> '6999999999999'
+
+-- 123456789012345 123456789012345 1 23456789012345
+subx470 subtract '0.444444444444444' '-0.555555555555563' -> '1.00000000000001' Inexact Rounded
+subx471 subtract '0.444444444444444' '-0.555555555555562' -> '1.00000000000001' Inexact Rounded
+subx472 subtract '0.444444444444444' '-0.555555555555561' -> '1.00000000000001' Inexact Rounded
+subx473 subtract '0.444444444444444' '-0.555555555555560' -> '1.00000000000000' Inexact Rounded
+subx474 subtract '0.444444444444444' '-0.555555555555559' -> '1.00000000000000' Inexact Rounded
+subx475 subtract '0.444444444444444' '-0.555555555555558' -> '1.00000000000000' Inexact Rounded
+subx476 subtract '0.444444444444444' '-0.555555555555557' -> '1.00000000000000' Inexact Rounded
+subx477 subtract '0.444444444444444' '-0.555555555555556' -> '1.00000000000000' Rounded
+subx478 subtract '0.444444444444444' '-0.555555555555555' -> '0.999999999999999'
+subx479 subtract '0.444444444444444' '-0.555555555555554' -> '0.999999999999998'
+subx480 subtract '0.444444444444444' '-0.555555555555553' -> '0.999999999999997'
+subx481 subtract '0.444444444444444' '-0.555555555555552' -> '0.999999999999996'
+subx482 subtract '0.444444444444444' '-0.555555555555551' -> '0.999999999999995'
+subx483 subtract '0.444444444444444' '-0.555555555555550' -> '0.999999999999994'
+
+-- and some more, including residue effects and different roundings
+precision: 9
+rounding: half_up
+subx500 subtract '123456789' 0 -> '123456789'
+subx501 subtract '123456789' 0.000000001 -> '123456789' Inexact Rounded
+subx502 subtract '123456789' 0.000001 -> '123456789' Inexact Rounded
+subx503 subtract '123456789' 0.1 -> '123456789' Inexact Rounded
+subx504 subtract '123456789' 0.4 -> '123456789' Inexact Rounded
+subx505 subtract '123456789' 0.49 -> '123456789' Inexact Rounded
+subx506 subtract '123456789' 0.499999 -> '123456789' Inexact Rounded
+subx507 subtract '123456789' 0.499999999 -> '123456789' Inexact Rounded
+subx508 subtract '123456789' 0.5 -> '123456789' Inexact Rounded
+subx509 subtract '123456789' 0.500000001 -> '123456788' Inexact Rounded
+subx510 subtract '123456789' 0.500001 -> '123456788' Inexact Rounded
+subx511 subtract '123456789' 0.51 -> '123456788' Inexact Rounded
+subx512 subtract '123456789' 0.6 -> '123456788' Inexact Rounded
+subx513 subtract '123456789' 0.9 -> '123456788' Inexact Rounded
+subx514 subtract '123456789' 0.99999 -> '123456788' Inexact Rounded
+subx515 subtract '123456789' 0.999999999 -> '123456788' Inexact Rounded
+subx516 subtract '123456789' 1 -> '123456788'
+subx517 subtract '123456789' 1.000000001 -> '123456788' Inexact Rounded
+subx518 subtract '123456789' 1.00001 -> '123456788' Inexact Rounded
+subx519 subtract '123456789' 1.1 -> '123456788' Inexact Rounded
+
+rounding: half_even
+subx520 subtract '123456789' 0 -> '123456789'
+subx521 subtract '123456789' 0.000000001 -> '123456789' Inexact Rounded
+subx522 subtract '123456789' 0.000001 -> '123456789' Inexact Rounded
+subx523 subtract '123456789' 0.1 -> '123456789' Inexact Rounded
+subx524 subtract '123456789' 0.4 -> '123456789' Inexact Rounded
+subx525 subtract '123456789' 0.49 -> '123456789' Inexact Rounded
+subx526 subtract '123456789' 0.499999 -> '123456789' Inexact Rounded
+subx527 subtract '123456789' 0.499999999 -> '123456789' Inexact Rounded
+subx528 subtract '123456789' 0.5 -> '123456788' Inexact Rounded
+subx529 subtract '123456789' 0.500000001 -> '123456788' Inexact Rounded
+subx530 subtract '123456789' 0.500001 -> '123456788' Inexact Rounded
+subx531 subtract '123456789' 0.51 -> '123456788' Inexact Rounded
+subx532 subtract '123456789' 0.6 -> '123456788' Inexact Rounded
+subx533 subtract '123456789' 0.9 -> '123456788' Inexact Rounded
+subx534 subtract '123456789' 0.99999 -> '123456788' Inexact Rounded
+subx535 subtract '123456789' 0.999999999 -> '123456788' Inexact Rounded
+subx536 subtract '123456789' 1 -> '123456788'
+subx537 subtract '123456789' 1.00000001 -> '123456788' Inexact Rounded
+subx538 subtract '123456789' 1.00001 -> '123456788' Inexact Rounded
+subx539 subtract '123456789' 1.1 -> '123456788' Inexact Rounded
+-- critical few with even bottom digit...
+subx540 subtract '123456788' 0.499999999 -> '123456788' Inexact Rounded
+subx541 subtract '123456788' 0.5 -> '123456788' Inexact Rounded
+subx542 subtract '123456788' 0.500000001 -> '123456787' Inexact Rounded
+
+rounding: down
+subx550 subtract '123456789' 0 -> '123456789'
+subx551 subtract '123456789' 0.000000001 -> '123456788' Inexact Rounded
+subx552 subtract '123456789' 0.000001 -> '123456788' Inexact Rounded
+subx553 subtract '123456789' 0.1 -> '123456788' Inexact Rounded
+subx554 subtract '123456789' 0.4 -> '123456788' Inexact Rounded
+subx555 subtract '123456789' 0.49 -> '123456788' Inexact Rounded
+subx556 subtract '123456789' 0.499999 -> '123456788' Inexact Rounded
+subx557 subtract '123456789' 0.499999999 -> '123456788' Inexact Rounded
+subx558 subtract '123456789' 0.5 -> '123456788' Inexact Rounded
+subx559 subtract '123456789' 0.500000001 -> '123456788' Inexact Rounded
+subx560 subtract '123456789' 0.500001 -> '123456788' Inexact Rounded
+subx561 subtract '123456789' 0.51 -> '123456788' Inexact Rounded
+subx562 subtract '123456789' 0.6 -> '123456788' Inexact Rounded
+subx563 subtract '123456789' 0.9 -> '123456788' Inexact Rounded
+subx564 subtract '123456789' 0.99999 -> '123456788' Inexact Rounded
+subx565 subtract '123456789' 0.999999999 -> '123456788' Inexact Rounded
+subx566 subtract '123456789' 1 -> '123456788'
+subx567 subtract '123456789' 1.00000001 -> '123456787' Inexact Rounded
+subx568 subtract '123456789' 1.00001 -> '123456787' Inexact Rounded
+subx569 subtract '123456789' 1.1 -> '123456787' Inexact Rounded
+
+-- symmetry...
+rounding: half_up
+subx600 subtract 0 '123456789' -> '-123456789'
+subx601 subtract 0.000000001 '123456789' -> '-123456789' Inexact Rounded
+subx602 subtract 0.000001 '123456789' -> '-123456789' Inexact Rounded
+subx603 subtract 0.1 '123456789' -> '-123456789' Inexact Rounded
+subx604 subtract 0.4 '123456789' -> '-123456789' Inexact Rounded
+subx605 subtract 0.49 '123456789' -> '-123456789' Inexact Rounded
+subx606 subtract 0.499999 '123456789' -> '-123456789' Inexact Rounded
+subx607 subtract 0.499999999 '123456789' -> '-123456789' Inexact Rounded
+subx608 subtract 0.5 '123456789' -> '-123456789' Inexact Rounded
+subx609 subtract 0.500000001 '123456789' -> '-123456788' Inexact Rounded
+subx610 subtract 0.500001 '123456789' -> '-123456788' Inexact Rounded
+subx611 subtract 0.51 '123456789' -> '-123456788' Inexact Rounded
+subx612 subtract 0.6 '123456789' -> '-123456788' Inexact Rounded
+subx613 subtract 0.9 '123456789' -> '-123456788' Inexact Rounded
+subx614 subtract 0.99999 '123456789' -> '-123456788' Inexact Rounded
+subx615 subtract 0.999999999 '123456789' -> '-123456788' Inexact Rounded
+subx616 subtract 1 '123456789' -> '-123456788'
+subx617 subtract 1.000000001 '123456789' -> '-123456788' Inexact Rounded
+subx618 subtract 1.00001 '123456789' -> '-123456788' Inexact Rounded
+subx619 subtract 1.1 '123456789' -> '-123456788' Inexact Rounded
+
+rounding: half_even
+subx620 subtract 0 '123456789' -> '-123456789'
+subx621 subtract 0.000000001 '123456789' -> '-123456789' Inexact Rounded
+subx622 subtract 0.000001 '123456789' -> '-123456789' Inexact Rounded
+subx623 subtract 0.1 '123456789' -> '-123456789' Inexact Rounded
+subx624 subtract 0.4 '123456789' -> '-123456789' Inexact Rounded
+subx625 subtract 0.49 '123456789' -> '-123456789' Inexact Rounded
+subx626 subtract 0.499999 '123456789' -> '-123456789' Inexact Rounded
+subx627 subtract 0.499999999 '123456789' -> '-123456789' Inexact Rounded
+subx628 subtract 0.5 '123456789' -> '-123456788' Inexact Rounded
+subx629 subtract 0.500000001 '123456789' -> '-123456788' Inexact Rounded
+subx630 subtract 0.500001 '123456789' -> '-123456788' Inexact Rounded
+subx631 subtract 0.51 '123456789' -> '-123456788' Inexact Rounded
+subx632 subtract 0.6 '123456789' -> '-123456788' Inexact Rounded
+subx633 subtract 0.9 '123456789' -> '-123456788' Inexact Rounded
+subx634 subtract 0.99999 '123456789' -> '-123456788' Inexact Rounded
+subx635 subtract 0.999999999 '123456789' -> '-123456788' Inexact Rounded
+subx636 subtract 1 '123456789' -> '-123456788'
+subx637 subtract 1.00000001 '123456789' -> '-123456788' Inexact Rounded
+subx638 subtract 1.00001 '123456789' -> '-123456788' Inexact Rounded
+subx639 subtract 1.1 '123456789' -> '-123456788' Inexact Rounded
+-- critical few with even bottom digit...
+subx640 subtract 0.499999999 '123456788' -> '-123456788' Inexact Rounded
+subx641 subtract 0.5 '123456788' -> '-123456788' Inexact Rounded
+subx642 subtract 0.500000001 '123456788' -> '-123456787' Inexact Rounded
+
+rounding: down
+subx650 subtract 0 '123456789' -> '-123456789'
+subx651 subtract 0.000000001 '123456789' -> '-123456788' Inexact Rounded
+subx652 subtract 0.000001 '123456789' -> '-123456788' Inexact Rounded
+subx653 subtract 0.1 '123456789' -> '-123456788' Inexact Rounded
+subx654 subtract 0.4 '123456789' -> '-123456788' Inexact Rounded
+subx655 subtract 0.49 '123456789' -> '-123456788' Inexact Rounded
+subx656 subtract 0.499999 '123456789' -> '-123456788' Inexact Rounded
+subx657 subtract 0.499999999 '123456789' -> '-123456788' Inexact Rounded
+subx658 subtract 0.5 '123456789' -> '-123456788' Inexact Rounded
+subx659 subtract 0.500000001 '123456789' -> '-123456788' Inexact Rounded
+subx660 subtract 0.500001 '123456789' -> '-123456788' Inexact Rounded
+subx661 subtract 0.51 '123456789' -> '-123456788' Inexact Rounded
+subx662 subtract 0.6 '123456789' -> '-123456788' Inexact Rounded
+subx663 subtract 0.9 '123456789' -> '-123456788' Inexact Rounded
+subx664 subtract 0.99999 '123456789' -> '-123456788' Inexact Rounded
+subx665 subtract 0.999999999 '123456789' -> '-123456788' Inexact Rounded
+subx666 subtract 1 '123456789' -> '-123456788'
+subx667 subtract 1.00000001 '123456789' -> '-123456787' Inexact Rounded
+subx668 subtract 1.00001 '123456789' -> '-123456787' Inexact Rounded
+subx669 subtract 1.1 '123456789' -> '-123456787' Inexact Rounded
+
+
+-- lots of leading zeros in intermediate result, and showing effects of
+-- input rounding would have affected the following
+precision: 9
+rounding: half_up
+subx670 subtract '123456789' '123456788.1' -> 0.9
+subx671 subtract '123456789' '123456788.9' -> 0.1
+subx672 subtract '123456789' '123456789.1' -> -0.1
+subx673 subtract '123456789' '123456789.5' -> -0.5
+subx674 subtract '123456789' '123456789.9' -> -0.9
+
+rounding: half_even
+subx680 subtract '123456789' '123456788.1' -> 0.9
+subx681 subtract '123456789' '123456788.9' -> 0.1
+subx682 subtract '123456789' '123456789.1' -> -0.1
+subx683 subtract '123456789' '123456789.5' -> -0.5
+subx684 subtract '123456789' '123456789.9' -> -0.9
+
+subx685 subtract '123456788' '123456787.1' -> 0.9
+subx686 subtract '123456788' '123456787.9' -> 0.1
+subx687 subtract '123456788' '123456788.1' -> -0.1
+subx688 subtract '123456788' '123456788.5' -> -0.5
+subx689 subtract '123456788' '123456788.9' -> -0.9
+
+rounding: down
+subx690 subtract '123456789' '123456788.1' -> 0.9
+subx691 subtract '123456789' '123456788.9' -> 0.1
+subx692 subtract '123456789' '123456789.1' -> -0.1
+subx693 subtract '123456789' '123456789.5' -> -0.5
+subx694 subtract '123456789' '123456789.9' -> -0.9
+
+-- input preparation tests
+rounding: half_up
+precision: 3
+
+subx700 subtract '12345678900000' -9999999999999 -> '2.23E+13' Inexact Rounded
+subx701 subtract '9999999999999' -12345678900000 -> '2.23E+13' Inexact Rounded
+subx702 subtract '12E+3' '-3456' -> '1.55E+4' Inexact Rounded
+subx703 subtract '12E+3' '-3446' -> '1.54E+4' Inexact Rounded
+subx704 subtract '12E+3' '-3454' -> '1.55E+4' Inexact Rounded
+subx705 subtract '12E+3' '-3444' -> '1.54E+4' Inexact Rounded
+
+subx706 subtract '3456' '-12E+3' -> '1.55E+4' Inexact Rounded
+subx707 subtract '3446' '-12E+3' -> '1.54E+4' Inexact Rounded
+subx708 subtract '3454' '-12E+3' -> '1.55E+4' Inexact Rounded
+subx709 subtract '3444' '-12E+3' -> '1.54E+4' Inexact Rounded
+
+-- overflow and underflow tests [subnormals now possible]
+maxexponent: 999999999
+minexponent: -999999999
+precision: 9
+rounding: down
+subx710 subtract 1E+999999999 -9E+999999999 -> 9.99999999E+999999999 Overflow Inexact Rounded
+subx711 subtract 9E+999999999 -1E+999999999 -> 9.99999999E+999999999 Overflow Inexact Rounded
+rounding: half_up
+subx712 subtract 1E+999999999 -9E+999999999 -> Infinity Overflow Inexact Rounded
+subx713 subtract 9E+999999999 -1E+999999999 -> Infinity Overflow Inexact Rounded
+subx714 subtract -1.1E-999999999 -1E-999999999 -> -1E-1000000000 Subnormal
+subx715 subtract 1E-999999999 +1.1e-999999999 -> -1E-1000000000 Subnormal
+subx716 subtract -1E+999999999 +9E+999999999 -> -Infinity Overflow Inexact Rounded
+subx717 subtract -9E+999999999 +1E+999999999 -> -Infinity Overflow Inexact Rounded
+subx718 subtract +1.1E-999999999 +1E-999999999 -> 1E-1000000000 Subnormal
+subx719 subtract -1E-999999999 -1.1e-999999999 -> 1E-1000000000 Subnormal
+
+precision: 3
+subx720 subtract 1 9.999E+999999999 -> -Infinity Inexact Overflow Rounded
+subx721 subtract 1 -9.999E+999999999 -> Infinity Inexact Overflow Rounded
+subx722 subtract 9.999E+999999999 1 -> Infinity Inexact Overflow Rounded
+subx723 subtract -9.999E+999999999 1 -> -Infinity Inexact Overflow Rounded
+subx724 subtract 1 9.999E+999999999 -> -Infinity Inexact Overflow Rounded
+subx725 subtract 1 -9.999E+999999999 -> Infinity Inexact Overflow Rounded
+subx726 subtract 9.999E+999999999 1 -> Infinity Inexact Overflow Rounded
+subx727 subtract -9.999E+999999999 1 -> -Infinity Inexact Overflow Rounded
+
+-- [more below]
+
+-- long operand checks
+maxexponent: 999
+minexponent: -999
+precision: 9
+sub731 subtract 12345678000 0 -> 1.23456780E+10 Rounded
+sub732 subtract 0 12345678000 -> -1.23456780E+10 Rounded
+sub733 subtract 1234567800 0 -> 1.23456780E+9 Rounded
+sub734 subtract 0 1234567800 -> -1.23456780E+9 Rounded
+sub735 subtract 1234567890 0 -> 1.23456789E+9 Rounded
+sub736 subtract 0 1234567890 -> -1.23456789E+9 Rounded
+sub737 subtract 1234567891 0 -> 1.23456789E+9 Inexact Rounded
+sub738 subtract 0 1234567891 -> -1.23456789E+9 Inexact Rounded
+sub739 subtract 12345678901 0 -> 1.23456789E+10 Inexact Rounded
+sub740 subtract 0 12345678901 -> -1.23456789E+10 Inexact Rounded
+sub741 subtract 1234567896 0 -> 1.23456790E+9 Inexact Rounded
+sub742 subtract 0 1234567896 -> -1.23456790E+9 Inexact Rounded
+
+precision: 15
+sub751 subtract 12345678000 0 -> 12345678000
+sub752 subtract 0 12345678000 -> -12345678000
+sub753 subtract 1234567800 0 -> 1234567800
+sub754 subtract 0 1234567800 -> -1234567800
+sub755 subtract 1234567890 0 -> 1234567890
+sub756 subtract 0 1234567890 -> -1234567890
+sub757 subtract 1234567891 0 -> 1234567891
+sub758 subtract 0 1234567891 -> -1234567891
+sub759 subtract 12345678901 0 -> 12345678901
+sub760 subtract 0 12345678901 -> -12345678901
+sub761 subtract 1234567896 0 -> 1234567896
+sub762 subtract 0 1234567896 -> -1234567896
+
+-- Specials
+subx780 subtract -Inf Inf -> -Infinity
+subx781 subtract -Inf 1000 -> -Infinity
+subx782 subtract -Inf 1 -> -Infinity
+subx783 subtract -Inf -0 -> -Infinity
+subx784 subtract -Inf -1 -> -Infinity
+subx785 subtract -Inf -1000 -> -Infinity
+subx787 subtract -1000 Inf -> -Infinity
+subx788 subtract -Inf Inf -> -Infinity
+subx789 subtract -1 Inf -> -Infinity
+subx790 subtract 0 Inf -> -Infinity
+subx791 subtract 1 Inf -> -Infinity
+subx792 subtract 1000 Inf -> -Infinity
+
+subx800 subtract Inf Inf -> NaN Invalid_operation
+subx801 subtract Inf 1000 -> Infinity
+subx802 subtract Inf 1 -> Infinity
+subx803 subtract Inf 0 -> Infinity
+subx804 subtract Inf -0 -> Infinity
+subx805 subtract Inf -1 -> Infinity
+subx806 subtract Inf -1000 -> Infinity
+subx807 subtract Inf -Inf -> Infinity
+subx808 subtract -1000 -Inf -> Infinity
+subx809 subtract -Inf -Inf -> NaN Invalid_operation
+subx810 subtract -1 -Inf -> Infinity
+subx811 subtract -0 -Inf -> Infinity
+subx812 subtract 0 -Inf -> Infinity
+subx813 subtract 1 -Inf -> Infinity
+subx814 subtract 1000 -Inf -> Infinity
+subx815 subtract Inf -Inf -> Infinity
+
+subx821 subtract NaN Inf -> NaN
+subx822 subtract -NaN 1000 -> -NaN
+subx823 subtract NaN 1 -> NaN
+subx824 subtract NaN 0 -> NaN
+subx825 subtract NaN -0 -> NaN
+subx826 subtract NaN -1 -> NaN
+subx827 subtract NaN -1000 -> NaN
+subx828 subtract NaN -Inf -> NaN
+subx829 subtract -NaN NaN -> -NaN
+subx830 subtract -Inf NaN -> NaN
+subx831 subtract -1000 NaN -> NaN
+subx832 subtract -1 NaN -> NaN
+subx833 subtract -0 NaN -> NaN
+subx834 subtract 0 NaN -> NaN
+subx835 subtract 1 NaN -> NaN
+subx836 subtract 1000 -NaN -> -NaN
+subx837 subtract Inf NaN -> NaN
+
+subx841 subtract sNaN Inf -> NaN Invalid_operation
+subx842 subtract -sNaN 1000 -> -NaN Invalid_operation
+subx843 subtract sNaN 1 -> NaN Invalid_operation
+subx844 subtract sNaN 0 -> NaN Invalid_operation
+subx845 subtract sNaN -0 -> NaN Invalid_operation
+subx846 subtract sNaN -1 -> NaN Invalid_operation
+subx847 subtract sNaN -1000 -> NaN Invalid_operation
+subx848 subtract sNaN NaN -> NaN Invalid_operation
+subx849 subtract sNaN sNaN -> NaN Invalid_operation
+subx850 subtract NaN sNaN -> NaN Invalid_operation
+subx851 subtract -Inf -sNaN -> -NaN Invalid_operation
+subx852 subtract -1000 sNaN -> NaN Invalid_operation
+subx853 subtract -1 sNaN -> NaN Invalid_operation
+subx854 subtract -0 sNaN -> NaN Invalid_operation
+subx855 subtract 0 sNaN -> NaN Invalid_operation
+subx856 subtract 1 sNaN -> NaN Invalid_operation
+subx857 subtract 1000 sNaN -> NaN Invalid_operation
+subx858 subtract Inf sNaN -> NaN Invalid_operation
+subx859 subtract NaN sNaN -> NaN Invalid_operation
+
+-- propagating NaNs
+subx861 subtract NaN01 -Inf -> NaN1
+subx862 subtract -NaN02 -1000 -> -NaN2
+subx863 subtract NaN03 1000 -> NaN3
+subx864 subtract NaN04 Inf -> NaN4
+subx865 subtract NaN05 NaN61 -> NaN5
+subx866 subtract -Inf -NaN71 -> -NaN71
+subx867 subtract -1000 NaN81 -> NaN81
+subx868 subtract 1000 NaN91 -> NaN91
+subx869 subtract Inf NaN101 -> NaN101
+subx871 subtract sNaN011 -Inf -> NaN11 Invalid_operation
+subx872 subtract sNaN012 -1000 -> NaN12 Invalid_operation
+subx873 subtract -sNaN013 1000 -> -NaN13 Invalid_operation
+subx874 subtract sNaN014 NaN171 -> NaN14 Invalid_operation
+subx875 subtract sNaN015 sNaN181 -> NaN15 Invalid_operation
+subx876 subtract NaN016 sNaN191 -> NaN191 Invalid_operation
+subx877 subtract -Inf sNaN201 -> NaN201 Invalid_operation
+subx878 subtract -1000 sNaN211 -> NaN211 Invalid_operation
+subx879 subtract 1000 -sNaN221 -> -NaN221 Invalid_operation
+subx880 subtract Inf sNaN231 -> NaN231 Invalid_operation
+subx881 subtract NaN025 sNaN241 -> NaN241 Invalid_operation
+
+-- edge case spills
+subx901 subtract 2.E-3 1.002 -> -1.000
+subx902 subtract 2.0E-3 1.002 -> -1.0000
+subx903 subtract 2.00E-3 1.0020 -> -1.00000
+subx904 subtract 2.000E-3 1.00200 -> -1.000000
+subx905 subtract 2.0000E-3 1.002000 -> -1.0000000
+subx906 subtract 2.00000E-3 1.0020000 -> -1.00000000
+subx907 subtract 2.000000E-3 1.00200000 -> -1.000000000
+subx908 subtract 2.0000000E-3 1.002000000 -> -1.0000000000
+
+-- subnormals and underflows
+precision: 3
+maxexponent: 999
+minexponent: -999
+subx1010 subtract 0 1.00E-999 -> -1.00E-999
+subx1011 subtract 0 0.1E-999 -> -1E-1000 Subnormal
+subx1012 subtract 0 0.10E-999 -> -1.0E-1000 Subnormal
+subx1013 subtract 0 0.100E-999 -> -1.0E-1000 Subnormal Rounded
+subx1014 subtract 0 0.01E-999 -> -1E-1001 Subnormal
+-- next is rounded to Emin
+subx1015 subtract 0 0.999E-999 -> -1.00E-999 Inexact Rounded Subnormal Underflow
+subx1016 subtract 0 0.099E-999 -> -1.0E-1000 Inexact Rounded Subnormal Underflow
+subx1017 subtract 0 0.009E-999 -> -1E-1001 Inexact Rounded Subnormal Underflow
+subx1018 subtract 0 0.001E-999 -> -0E-1001 Inexact Rounded Subnormal Underflow Clamped
+subx1019 subtract 0 0.0009E-999 -> -0E-1001 Inexact Rounded Subnormal Underflow Clamped
+subx1020 subtract 0 0.0001E-999 -> -0E-1001 Inexact Rounded Subnormal Underflow Clamped
+
+subx1030 subtract 0 -1.00E-999 -> 1.00E-999
+subx1031 subtract 0 -0.1E-999 -> 1E-1000 Subnormal
+subx1032 subtract 0 -0.10E-999 -> 1.0E-1000 Subnormal
+subx1033 subtract 0 -0.100E-999 -> 1.0E-1000 Subnormal Rounded
+subx1034 subtract 0 -0.01E-999 -> 1E-1001 Subnormal
+-- next is rounded to Emin
+subx1035 subtract 0 -0.999E-999 -> 1.00E-999 Inexact Rounded Subnormal Underflow
+subx1036 subtract 0 -0.099E-999 -> 1.0E-1000 Inexact Rounded Subnormal Underflow
+subx1037 subtract 0 -0.009E-999 -> 1E-1001 Inexact Rounded Subnormal Underflow
+subx1038 subtract 0 -0.001E-999 -> 0E-1001 Inexact Rounded Subnormal Underflow Clamped
+subx1039 subtract 0 -0.0009E-999 -> 0E-1001 Inexact Rounded Subnormal Underflow Clamped
+subx1040 subtract 0 -0.0001E-999 -> 0E-1001 Inexact Rounded Subnormal Underflow Clamped
+
+-- some non-zero subnormal subtracts
+-- subx1056 is a tricky case
+rounding: half_up
+subx1050 subtract 1.00E-999 0.1E-999 -> 9.0E-1000 Subnormal
+subx1051 subtract 0.1E-999 0.1E-999 -> 0E-1000
+subx1052 subtract 0.10E-999 0.1E-999 -> 0E-1001
+subx1053 subtract 0.100E-999 0.1E-999 -> 0E-1001 Clamped
+subx1054 subtract 0.01E-999 0.1E-999 -> -9E-1001 Subnormal
+subx1055 subtract 0.999E-999 0.1E-999 -> 9.0E-1000 Inexact Rounded Subnormal Underflow
+subx1056 subtract 0.099E-999 0.1E-999 -> -0E-1001 Inexact Rounded Subnormal Underflow Clamped
+subx1057 subtract 0.009E-999 0.1E-999 -> -9E-1001 Inexact Rounded Subnormal Underflow
+subx1058 subtract 0.001E-999 0.1E-999 -> -1.0E-1000 Inexact Rounded Subnormal Underflow
+subx1059 subtract 0.0009E-999 0.1E-999 -> -1.0E-1000 Inexact Rounded Subnormal Underflow
+subx1060 subtract 0.0001E-999 0.1E-999 -> -1.0E-1000 Inexact Rounded Subnormal Underflow
+
+
+-- check for double-rounded subnormals
+precision: 5
+maxexponent: 79
+minexponent: -79
+subx1101 subtract 0 1.52444E-80 -> -1.524E-80 Inexact Rounded Subnormal Underflow
+subx1102 subtract 0 1.52445E-80 -> -1.524E-80 Inexact Rounded Subnormal Underflow
+subx1103 subtract 0 1.52446E-80 -> -1.524E-80 Inexact Rounded Subnormal Underflow
+subx1104 subtract 1.52444E-80 0 -> 1.524E-80 Inexact Rounded Subnormal Underflow
+subx1105 subtract 1.52445E-80 0 -> 1.524E-80 Inexact Rounded Subnormal Underflow
+subx1106 subtract 1.52446E-80 0 -> 1.524E-80 Inexact Rounded Subnormal Underflow
+
+subx1111 subtract 1.2345678E-80 1.2345671E-80 -> 0E-83 Inexact Rounded Subnormal Underflow Clamped
+subx1112 subtract 1.2345678E-80 1.2345618E-80 -> 0E-83 Inexact Rounded Subnormal Underflow Clamped
+subx1113 subtract 1.2345678E-80 1.2345178E-80 -> 0E-83 Inexact Rounded Subnormal Underflow Clamped
+subx1114 subtract 1.2345678E-80 1.2341678E-80 -> 0E-83 Inexact Rounded Subnormal Underflow Clamped
+subx1115 subtract 1.2345678E-80 1.2315678E-80 -> 3E-83 Rounded Subnormal
+subx1116 subtract 1.2345678E-80 1.2145678E-80 -> 2.0E-82 Rounded Subnormal
+subx1117 subtract 1.2345678E-80 1.1345678E-80 -> 1.00E-81 Rounded Subnormal
+subx1118 subtract 1.2345678E-80 0.2345678E-80 -> 1.000E-80 Rounded Subnormal
+
+precision: 34
+rounding: half_up
+maxExponent: 6144
+minExponent: -6143
+-- Examples from SQL proposal (Krishna Kulkarni)
+subx1125 subtract 130E-2 120E-2 -> 0.10
+subx1126 subtract 130E-2 12E-1 -> 0.10
+subx1127 subtract 130E-2 1E0 -> 0.30
+subx1128 subtract 1E2 1E4 -> -9.9E+3
+
+-- Null tests
+subx9990 subtract 10 # -> NaN Invalid_operation
+subx9991 subtract # 10 -> NaN Invalid_operation