AppPkg/Applications/Python/Python-2.7.2/Lib/test/decimaltestdata/subtract.decTest

   1 ------------------------------------------------------------------------
   2 -- subtract.decTest -- decimal subtraction                            --
   3 -- Copyright (c) IBM Corporation, 1981, 2008.  All rights reserved.   --
   4 ------------------------------------------------------------------------
   5 -- Please see the document "General Decimal Arithmetic Testcases"     --
   6 -- at http://www2.hursley.ibm.com/decimal for the description of      --
   7 -- these testcases.                                                   --
   8 --                                                                    --
   9 -- These testcases are experimental ('beta' versions), and they       --
  10 -- may contain errors.  They are offered on an as-is basis.  In       --
  11 -- particular, achieving the same results as the tests here is not    --
  12 -- a guarantee that an implementation complies with any Standard      --
  13 -- or specification.  The tests are not exhaustive.                   --
  14 --                                                                    --
  15 -- Please send comments, suggestions, and corrections to the author:  --
  16 --   Mike Cowlishaw, IBM Fellow                                       --
  17 --   IBM UK, PO Box 31, Birmingham Road, Warwick CV34 5JL, UK         --
  18 --   mfc@uk.ibm.com                                                   --
  19 ------------------------------------------------------------------------
  20 version: 2.59
  21
  22 extended:    1
  23 precision:   9
  24 rounding:    half_up
  25 maxExponent: 384
  26 minexponent: -383
  27
  28 -- [first group are 'quick confidence check']
  29 subx001 subtract  0   0  -> '0'
  30 subx002 subtract  1   1  -> '0'
  31 subx003 subtract  1   2  -> '-1'
  32 subx004 subtract  2   1  -> '1'
  33 subx005 subtract  2   2  -> '0'
  34 subx006 subtract  3   2  -> '1'
  35 subx007 subtract  2   3  -> '-1'
  36
  37 subx011 subtract -0   0  -> '-0'
  38 subx012 subtract -1   1  -> '-2'
  39 subx013 subtract -1   2  -> '-3'
  40 subx014 subtract -2   1  -> '-3'
  41 subx015 subtract -2   2  -> '-4'
  42 subx016 subtract -3   2  -> '-5'
  43 subx017 subtract -2   3  -> '-5'
  44
  45 subx021 subtract  0  -0  -> '0'
  46 subx022 subtract  1  -1  -> '2'
  47 subx023 subtract  1  -2  -> '3'
  48 subx024 subtract  2  -1  -> '3'
  49 subx025 subtract  2  -2  -> '4'
  50 subx026 subtract  3  -2  -> '5'
  51 subx027 subtract  2  -3  -> '5'
  52
  53 subx030 subtract  11  1  -> 10
  54 subx031 subtract  10  1  ->  9
  55 subx032 subtract  9   1  ->  8
  56 subx033 subtract  1   1  ->  0
  57 subx034 subtract  0   1  -> -1
  58 subx035 subtract -1   1  -> -2
  59 subx036 subtract -9   1  -> -10
  60 subx037 subtract -10  1  -> -11
  61 subx038 subtract -11  1  -> -12
  62
  63 subx040 subtract '5.75' '3.3'  -> '2.45'
  64 subx041 subtract '5'    '-3'   -> '8'
  65 subx042 subtract '-5'   '-3'   -> '-2'
  66 subx043 subtract '-7'   '2.5'  -> '-9.5'
  67 subx044 subtract '0.7'  '0.3'  -> '0.4'
  68 subx045 subtract '1.3'  '0.3'  -> '1.0'
  69 subx046 subtract '1.25' '1.25' -> '0.00'
  70
  71 subx050 subtract '1.23456789'    '1.00000000' -> '0.23456789'
  72 subx051 subtract '1.23456789'    '1.00000089' -> '0.23456700'
  73 subx052 subtract '0.5555555559'    '0.0000000001' -> '0.555555556' Inexact Rounded
  74 subx053 subtract '0.5555555559'    '0.0000000005' -> '0.555555555' Inexact Rounded
  75 subx054 subtract '0.4444444444'    '0.1111111111' -> '0.333333333' Inexact Rounded
  76 subx055 subtract '1.0000000000'    '0.00000001' -> '0.999999990' Rounded
  77 subx056 subtract '0.4444444444999'    '0' -> '0.444444444' Inexact Rounded
  78 subx057 subtract '0.4444444445000'    '0' -> '0.444444445' Inexact Rounded
  79
  80 subx060 subtract '70'    '10000e+9' -> '-1.00000000E+13' Inexact Rounded
  81 subx061 subtract '700'    '10000e+9' -> '-1.00000000E+13' Inexact Rounded
  82 subx062 subtract '7000'    '10000e+9' -> '-9.99999999E+12' Inexact Rounded
  83 subx063 subtract '70000'    '10000e+9' -> '-9.99999993E+12' Rounded
  84 subx064 subtract '700000'    '10000e+9' -> '-9.99999930E+12' Rounded
  85   -- symmetry:
  86 subx065 subtract '10000e+9'    '70' -> '1.00000000E+13' Inexact Rounded
  87 subx066 subtract '10000e+9'    '700' -> '1.00000000E+13' Inexact Rounded
  88 subx067 subtract '10000e+9'    '7000' -> '9.99999999E+12' Inexact Rounded
  89 subx068 subtract '10000e+9'    '70000' -> '9.99999993E+12' Rounded
  90 subx069 subtract '10000e+9'    '700000' -> '9.99999930E+12' Rounded
  91
  92   -- change precision
  93 subx080 subtract '10000e+9'    '70000' -> '9.99999993E+12' Rounded
  94 precision: 6
  95 subx081 subtract '10000e+9'    '70000' -> '1.00000E+13' Inexact Rounded
  96 precision: 9
  97
  98   -- some of the next group are really constructor tests
  99 subx090 subtract '00.0'    '0.0'  -> '0.0'
 100 subx091 subtract '00.0'    '0.00' -> '0.00'
 101 subx092 subtract '0.00'    '00.0' -> '0.00'
 102 subx093 subtract '00.0'    '0.00' -> '0.00'
 103 subx094 subtract '0.00'    '00.0' -> '0.00'
 104 subx095 subtract '3'    '.3'   -> '2.7'
 105 subx096 subtract '3.'   '.3'   -> '2.7'
 106 subx097 subtract '3.0'  '.3'   -> '2.7'
 107 subx098 subtract '3.00' '.3'   -> '2.70'
 108 subx099 subtract '3'    '3'    -> '0'
 109 subx100 subtract '3'    '+3'   -> '0'
 110 subx101 subtract '3'    '-3'   -> '6'
 111 subx102 subtract '3'    '0.3'  -> '2.7'
 112 subx103 subtract '3.'   '0.3'  -> '2.7'
 113 subx104 subtract '3.0'  '0.3'  -> '2.7'
 114 subx105 subtract '3.00' '0.3'  -> '2.70'
 115 subx106 subtract '3'    '3.0'  -> '0.0'
 116 subx107 subtract '3'    '+3.0' -> '0.0'
 117 subx108 subtract '3'    '-3.0' -> '6.0'
 118
 119 -- the above all from add; massaged and extended.  Now some new ones...
 120 -- [particularly important for comparisons]
 121 -- NB: -xE-8 below were non-exponents pre-ANSI X3-274, and -1E-7 or 0E-7
 122 -- with input rounding.
 123 subx120 subtract  '10.23456784'    '10.23456789'  -> '-5E-8'
 124 subx121 subtract  '10.23456785'    '10.23456789'  -> '-4E-8'
 125 subx122 subtract  '10.23456786'    '10.23456789'  -> '-3E-8'
 126 subx123 subtract  '10.23456787'    '10.23456789'  -> '-2E-8'
 127 subx124 subtract  '10.23456788'    '10.23456789'  -> '-1E-8'
 128 subx125 subtract  '10.23456789'    '10.23456789'  -> '0E-8'
 129 subx126 subtract  '10.23456790'    '10.23456789'  -> '1E-8'
 130 subx127 subtract  '10.23456791'    '10.23456789'  -> '2E-8'
 131 subx128 subtract  '10.23456792'    '10.23456789'  -> '3E-8'
 132 subx129 subtract  '10.23456793'    '10.23456789'  -> '4E-8'
 133 subx130 subtract  '10.23456794'    '10.23456789'  -> '5E-8'
 134 subx131 subtract  '10.23456781'    '10.23456786'  -> '-5E-8'
 135 subx132 subtract  '10.23456782'    '10.23456786'  -> '-4E-8'
 136 subx133 subtract  '10.23456783'    '10.23456786'  -> '-3E-8'
 137 subx134 subtract  '10.23456784'    '10.23456786'  -> '-2E-8'
 138 subx135 subtract  '10.23456785'    '10.23456786'  -> '-1E-8'
 139 subx136 subtract  '10.23456786'    '10.23456786'  -> '0E-8'
 140 subx137 subtract  '10.23456787'    '10.23456786'  -> '1E-8'
 141 subx138 subtract  '10.23456788'    '10.23456786'  -> '2E-8'
 142 subx139 subtract  '10.23456789'    '10.23456786'  -> '3E-8'
 143 subx140 subtract  '10.23456790'    '10.23456786'  -> '4E-8'
 144 subx141 subtract  '10.23456791'    '10.23456786'  -> '5E-8'
 145 subx142 subtract  '1'              '0.999999999'  -> '1E-9'
 146 subx143 subtract  '0.999999999'    '1'            -> '-1E-9'
 147 subx144 subtract  '-10.23456780'   '-10.23456786' -> '6E-8'
 148 subx145 subtract  '-10.23456790'   '-10.23456786' -> '-4E-8'
 149 subx146 subtract  '-10.23456791'   '-10.23456786' -> '-5E-8'
 150
 151 precision: 3
 152 subx150 subtract '12345678900000' '9999999999999'  -> 2.35E+12 Inexact Rounded
 153 subx151 subtract '9999999999999'  '12345678900000' -> -2.35E+12 Inexact Rounded
 154 precision: 6
 155 subx152 subtract '12345678900000' '9999999999999'  -> 2.34568E+12 Inexact Rounded
 156 subx153 subtract '9999999999999'  '12345678900000' -> -2.34568E+12 Inexact Rounded
 157 precision: 9
 158 subx154 subtract '12345678900000' '9999999999999'  -> 2.34567890E+12 Inexact Rounded
 159 subx155 subtract '9999999999999'  '12345678900000' -> -2.34567890E+12 Inexact Rounded
 160 precision: 12
 161 subx156 subtract '12345678900000' '9999999999999'  -> 2.34567890000E+12 Inexact Rounded
 162 subx157 subtract '9999999999999'  '12345678900000' -> -2.34567890000E+12 Inexact Rounded
 163 precision: 15
 164 subx158 subtract '12345678900000' '9999999999999'  -> 2345678900001
 165 subx159 subtract '9999999999999'  '12345678900000' -> -2345678900001
 166 precision: 9
 167
 168 -- additional scaled arithmetic tests [0.97 problem]
 169 subx160 subtract '0'     '.1'      -> '-0.1'
 170 subx161 subtract '00'    '.97983'  -> '-0.97983'
 171 subx162 subtract '0'     '.9'      -> '-0.9'
 172 subx163 subtract '0'     '0.102'   -> '-0.102'
 173 subx164 subtract '0'     '.4'      -> '-0.4'
 174 subx165 subtract '0'     '.307'    -> '-0.307'
 175 subx166 subtract '0'     '.43822'  -> '-0.43822'
 176 subx167 subtract '0'     '.911'    -> '-0.911'
 177 subx168 subtract '.0'    '.02'     -> '-0.02'
 178 subx169 subtract '00'    '.392'    -> '-0.392'
 179 subx170 subtract '0'     '.26'     -> '-0.26'
 180 subx171 subtract '0'     '0.51'    -> '-0.51'
 181 subx172 subtract '0'     '.2234'   -> '-0.2234'
 182 subx173 subtract '0'     '.2'      -> '-0.2'
 183 subx174 subtract '.0'    '.0008'   -> '-0.0008'
 184 -- 0. on left
 185 subx180 subtract '0.0'     '-.1'      -> '0.1'
 186 subx181 subtract '0.00'    '-.97983'  -> '0.97983'
 187 subx182 subtract '0.0'     '-.9'      -> '0.9'
 188 subx183 subtract '0.0'     '-0.102'   -> '0.102'
 189 subx184 subtract '0.0'     '-.4'      -> '0.4'
 190 subx185 subtract '0.0'     '-.307'    -> '0.307'
 191 subx186 subtract '0.0'     '-.43822'  -> '0.43822'
 192 subx187 subtract '0.0'     '-.911'    -> '0.911'
 193 subx188 subtract '0.0'     '-.02'     -> '0.02'
 194 subx189 subtract '0.00'    '-.392'    -> '0.392'
 195 subx190 subtract '0.0'     '-.26'     -> '0.26'
 196 subx191 subtract '0.0'     '-0.51'    -> '0.51'
 197 subx192 subtract '0.0'     '-.2234'   -> '0.2234'
 198 subx193 subtract '0.0'     '-.2'      -> '0.2'
 199 subx194 subtract '0.0'     '-.0008'   -> '0.0008'
 200 -- negatives of same
 201 subx200 subtract '0'     '-.1'      -> '0.1'
 202 subx201 subtract '00'    '-.97983'  -> '0.97983'
 203 subx202 subtract '0'     '-.9'      -> '0.9'
 204 subx203 subtract '0'     '-0.102'   -> '0.102'
 205 subx204 subtract '0'     '-.4'      -> '0.4'
 206 subx205 subtract '0'     '-.307'    -> '0.307'
 207 subx206 subtract '0'     '-.43822'  -> '0.43822'
 208 subx207 subtract '0'     '-.911'    -> '0.911'
 209 subx208 subtract '.0'    '-.02'     -> '0.02'
 210 subx209 subtract '00'    '-.392'    -> '0.392'
 211 subx210 subtract '0'     '-.26'     -> '0.26'
 212 subx211 subtract '0'     '-0.51'    -> '0.51'
 213 subx212 subtract '0'     '-.2234'   -> '0.2234'
 214 subx213 subtract '0'     '-.2'      -> '0.2'
 215 subx214 subtract '.0'    '-.0008'   -> '0.0008'
 216
 217 -- more fixed, LHS swaps [really the same as testcases under add]
 218 subx220 subtract '-56267E-12' 0  -> '-5.6267E-8'
 219 subx221 subtract '-56267E-11' 0  -> '-5.6267E-7'
 220 subx222 subtract '-56267E-10' 0  -> '-0.0000056267'
 221 subx223 subtract '-56267E-9'  0  -> '-0.000056267'
 222 subx224 subtract '-56267E-8'  0  -> '-0.00056267'
 223 subx225 subtract '-56267E-7'  0  -> '-0.0056267'
 224 subx226 subtract '-56267E-6'  0  -> '-0.056267'
 225 subx227 subtract '-56267E-5'  0  -> '-0.56267'
 226 subx228 subtract '-56267E-2'  0  -> '-562.67'
 227 subx229 subtract '-56267E-1'  0  -> '-5626.7'
 228 subx230 subtract '-56267E-0'  0  -> '-56267'
 229 -- symmetry ...
 230 subx240 subtract 0 '-56267E-12'  -> '5.6267E-8'
 231 subx241 subtract 0 '-56267E-11'  -> '5.6267E-7'
 232 subx242 subtract 0 '-56267E-10'  -> '0.0000056267'
 233 subx243 subtract 0 '-56267E-9'   -> '0.000056267'
 234 subx244 subtract 0 '-56267E-8'   -> '0.00056267'
 235 subx245 subtract 0 '-56267E-7'   -> '0.0056267'
 236 subx246 subtract 0 '-56267E-6'   -> '0.056267'
 237 subx247 subtract 0 '-56267E-5'   -> '0.56267'
 238 subx248 subtract 0 '-56267E-2'   -> '562.67'
 239 subx249 subtract 0 '-56267E-1'   -> '5626.7'
 240 subx250 subtract 0 '-56267E-0'   -> '56267'
 241
 242 -- now some more from the 'new' add
 243 precision: 9
 244 subx301 subtract '1.23456789'  '1.00000000' -> '0.23456789'
 245 subx302 subtract '1.23456789'  '1.00000011' -> '0.23456778'
 246
 247 subx311 subtract '0.4444444444'  '0.5555555555' -> '-0.111111111' Inexact Rounded
 248 subx312 subtract '0.4444444440'  '0.5555555555' -> '-0.111111112' Inexact Rounded
 249 subx313 subtract '0.4444444444'  '0.5555555550' -> '-0.111111111' Inexact Rounded
 250 subx314 subtract '0.44444444449'    '0' -> '0.444444444' Inexact Rounded
 251 subx315 subtract '0.444444444499'   '0' -> '0.444444444' Inexact Rounded
 252 subx316 subtract '0.4444444444999'  '0' -> '0.444444444' Inexact Rounded
 253 subx317 subtract '0.4444444445000'  '0' -> '0.444444445' Inexact Rounded
 254 subx318 subtract '0.4444444445001'  '0' -> '0.444444445' Inexact Rounded
 255 subx319 subtract '0.444444444501'   '0' -> '0.444444445' Inexact Rounded
 256 subx320 subtract '0.44444444451'    '0' -> '0.444444445' Inexact Rounded
 257
 258 -- some carrying effects
 259 subx321 subtract '0.9998'  '0.0000' -> '0.9998'
 260 subx322 subtract '0.9998'  '0.0001' -> '0.9997'
 261 subx323 subtract '0.9998'  '0.0002' -> '0.9996'
 262 subx324 subtract '0.9998'  '0.0003' -> '0.9995'
 263 subx325 subtract '0.9998'  '-0.0000' -> '0.9998'
 264 subx326 subtract '0.9998'  '-0.0001' -> '0.9999'
 265 subx327 subtract '0.9998'  '-0.0002' -> '1.0000'
 266 subx328 subtract '0.9998'  '-0.0003' -> '1.0001'
 267
 268 subx330 subtract '70'  '10000e+9' -> '-1.00000000E+13' Inexact Rounded
 269 subx331 subtract '700'  '10000e+9' -> '-1.00000000E+13' Inexact Rounded
 270 subx332 subtract '7000'  '10000e+9' -> '-9.99999999E+12' Inexact Rounded
 271 subx333 subtract '70000'  '10000e+9' -> '-9.99999993E+12' Rounded
 272 subx334 subtract '700000'  '10000e+9' -> '-9.99999930E+12' Rounded
 273 subx335 subtract '7000000'  '10000e+9' -> '-9.99999300E+12' Rounded
 274 -- symmetry:
 275 subx340 subtract '10000e+9'  '70' -> '1.00000000E+13' Inexact Rounded
 276 subx341 subtract '10000e+9'  '700' -> '1.00000000E+13' Inexact Rounded
 277 subx342 subtract '10000e+9'  '7000' -> '9.99999999E+12' Inexact Rounded
 278 subx343 subtract '10000e+9'  '70000' -> '9.99999993E+12' Rounded
 279 subx344 subtract '10000e+9'  '700000' -> '9.99999930E+12' Rounded
 280 subx345 subtract '10000e+9'  '7000000' -> '9.99999300E+12' Rounded
 281
 282 -- same, higher precision
 283 precision: 15
 284 subx346 subtract '10000e+9'  '7'   -> '9999999999993'
 285 subx347 subtract '10000e+9'  '70'   -> '9999999999930'
 286 subx348 subtract '10000e+9'  '700'   -> '9999999999300'
 287 subx349 subtract '10000e+9'  '7000'   -> '9999999993000'
 288 subx350 subtract '10000e+9'  '70000'   -> '9999999930000'
 289 subx351 subtract '10000e+9'  '700000'   -> '9999999300000'
 290 subx352 subtract '7' '10000e+9'   -> '-9999999999993'
 291 subx353 subtract '70' '10000e+9'   -> '-9999999999930'
 292 subx354 subtract '700' '10000e+9'   -> '-9999999999300'
 293 subx355 subtract '7000' '10000e+9'   -> '-9999999993000'
 294 subx356 subtract '70000' '10000e+9'   -> '-9999999930000'
 295 subx357 subtract '700000' '10000e+9'   -> '-9999999300000'
 296
 297 -- zero preservation
 298 precision: 6
 299 subx360 subtract '10000e+9'  '70000' -> '1.00000E+13' Inexact Rounded
 300 subx361 subtract 1 '0.0001' -> '0.9999'
 301 subx362 subtract 1 '0.00001' -> '0.99999'
 302 subx363 subtract 1 '0.000001' -> '0.999999'
 303 subx364 subtract 1 '0.0000001' -> '1.00000' Inexact Rounded
 304 subx365 subtract 1 '0.00000001' -> '1.00000' Inexact Rounded
 305
 306 -- some funny zeros [in case of bad signum]
 307 subx370 subtract 1  0  -> 1
 308 subx371 subtract 1 0.  -> 1
 309 subx372 subtract 1  .0 -> 1.0
 310 subx373 subtract 1 0.0 -> 1.0
 311 subx374 subtract  0  1 -> -1
 312 subx375 subtract 0.  1 -> -1
 313 subx376 subtract  .0 1 -> -1.0
 314 subx377 subtract 0.0 1 -> -1.0
 315
 316 precision: 9
 317
 318 -- leading 0 digit before round
 319 subx910 subtract -103519362 -51897955.3 -> -51621406.7
 320 subx911 subtract 159579.444 89827.5229 -> 69751.9211
 321
 322 subx920 subtract 333.123456 33.1234566 -> 299.999999 Inexact Rounded
 323 subx921 subtract 333.123456 33.1234565 -> 300.000000 Inexact Rounded
 324 subx922 subtract 133.123456 33.1234565 ->  99.9999995
 325 subx923 subtract 133.123456 33.1234564 ->  99.9999996
 326 subx924 subtract 133.123456 33.1234540 -> 100.000002 Rounded
 327 subx925 subtract 133.123456 43.1234560 ->  90.0000000
 328 subx926 subtract 133.123456 43.1234561 ->  89.9999999
 329 subx927 subtract 133.123456 43.1234566 ->  89.9999994
 330 subx928 subtract 101.123456 91.1234566 ->   9.9999994
 331 subx929 subtract 101.123456 99.1234566 ->   1.9999994
 332
 333 -- more of the same; probe for cluster boundary problems
 334 precision: 1
 335 subx930 subtract  11 2           -> 9
 336 precision: 2
 337 subx932 subtract 101 2           -> 99
 338 precision: 3
 339 subx934 subtract 101 2.1         -> 98.9
 340 subx935 subtract 101 92.01       ->  8.99
 341 precision: 4
 342 subx936 subtract 101 2.01        -> 98.99
 343 subx937 subtract 101 92.01       ->  8.99
 344 subx938 subtract 101 92.006      ->  8.994
 345 precision: 5
 346 subx939 subtract 101 2.001       -> 98.999
 347 subx940 subtract 101 92.001      ->  8.999
 348 subx941 subtract 101 92.0006     ->  8.9994
 349 precision: 6
 350 subx942 subtract 101 2.0001      -> 98.9999
 351 subx943 subtract 101 92.0001     ->  8.9999
 352 subx944 subtract 101 92.00006    ->  8.99994
 353 precision: 7
 354 subx945 subtract 101 2.00001     -> 98.99999
 355 subx946 subtract 101 92.00001    ->  8.99999
 356 subx947 subtract 101 92.000006   ->  8.999994
 357 precision: 8
 358 subx948 subtract 101 2.000001    -> 98.999999
 359 subx949 subtract 101 92.000001   ->  8.999999
 360 subx950 subtract 101 92.0000006  ->  8.9999994
 361 precision: 9
 362 subx951 subtract 101 2.0000001   -> 98.9999999
 363 subx952 subtract 101 92.0000001  ->  8.9999999
 364 subx953 subtract 101 92.00000006 ->  8.99999994
 365
 366 precision: 9
 367
 368 -- more LHS swaps [were fixed]
 369 subx390 subtract '-56267E-10'   0 ->  '-0.0000056267'
 370 subx391 subtract '-56267E-6'    0 ->  '-0.056267'
 371 subx392 subtract '-56267E-5'    0 ->  '-0.56267'
 372 subx393 subtract '-56267E-4'    0 ->  '-5.6267'
 373 subx394 subtract '-56267E-3'    0 ->  '-56.267'
 374 subx395 subtract '-56267E-2'    0 ->  '-562.67'
 375 subx396 subtract '-56267E-1'    0 ->  '-5626.7'
 376 subx397 subtract '-56267E-0'    0 ->  '-56267'
 377 subx398 subtract '-5E-10'       0 ->  '-5E-10'
 378 subx399 subtract '-5E-7'        0 ->  '-5E-7'
 379 subx400 subtract '-5E-6'        0 ->  '-0.000005'
 380 subx401 subtract '-5E-5'        0 ->  '-0.00005'
 381 subx402 subtract '-5E-4'        0 ->  '-0.0005'
 382 subx403 subtract '-5E-1'        0 ->  '-0.5'
 383 subx404 subtract '-5E0'         0 ->  '-5'
 384 subx405 subtract '-5E1'         0 ->  '-50'
 385 subx406 subtract '-5E5'         0 ->  '-500000'
 386 subx407 subtract '-5E8'         0 ->  '-500000000'
 387 subx408 subtract '-5E9'         0 ->  '-5.00000000E+9'   Rounded
 388 subx409 subtract '-5E10'        0 ->  '-5.00000000E+10'  Rounded
 389 subx410 subtract '-5E11'        0 ->  '-5.00000000E+11'  Rounded
 390 subx411 subtract '-5E100'       0 ->  '-5.00000000E+100' Rounded
 391
 392 -- more RHS swaps [were fixed]
 393 subx420 subtract 0  '-56267E-10' ->  '0.0000056267'
 394 subx421 subtract 0  '-56267E-6'  ->  '0.056267'
 395 subx422 subtract 0  '-56267E-5'  ->  '0.56267'
 396 subx423 subtract 0  '-56267E-4'  ->  '5.6267'
 397 subx424 subtract 0  '-56267E-3'  ->  '56.267'
 398 subx425 subtract 0  '-56267E-2'  ->  '562.67'
 399 subx426 subtract 0  '-56267E-1'  ->  '5626.7'
 400 subx427 subtract 0  '-56267E-0'  ->  '56267'
 401 subx428 subtract 0  '-5E-10'     ->  '5E-10'
 402 subx429 subtract 0  '-5E-7'      ->  '5E-7'
 403 subx430 subtract 0  '-5E-6'      ->  '0.000005'
 404 subx431 subtract 0  '-5E-5'      ->  '0.00005'
 405 subx432 subtract 0  '-5E-4'      ->  '0.0005'
 406 subx433 subtract 0  '-5E-1'      ->  '0.5'
 407 subx434 subtract 0  '-5E0'       ->  '5'
 408 subx435 subtract 0  '-5E1'       ->  '50'
 409 subx436 subtract 0  '-5E5'       ->  '500000'
 410 subx437 subtract 0  '-5E8'       ->  '500000000'
 411 subx438 subtract 0  '-5E9'       ->  '5.00000000E+9'    Rounded
 412 subx439 subtract 0  '-5E10'      ->  '5.00000000E+10'   Rounded
 413 subx440 subtract 0  '-5E11'      ->  '5.00000000E+11'   Rounded
 414 subx441 subtract 0  '-5E100'     ->  '5.00000000E+100'  Rounded
 415
 416
 417 -- try borderline precision, with carries, etc.
 418 precision: 15
 419 subx461 subtract '1E+12' '1'       -> '999999999999'
 420 subx462 subtract '1E+12' '-1.11'   -> '1000000000001.11'
 421 subx463 subtract '1.11'  '-1E+12'  -> '1000000000001.11'
 422 subx464 subtract '-1'    '-1E+12'  -> '999999999999'
 423 subx465 subtract '7E+12' '1'       -> '6999999999999'
 424 subx466 subtract '7E+12' '-1.11'   -> '7000000000001.11'
 425 subx467 subtract '1.11'  '-7E+12'  -> '7000000000001.11'
 426 subx468 subtract '-1'    '-7E+12'  -> '6999999999999'
 427
 428 --                 123456789012345       123456789012345      1 23456789012345
 429 subx470 subtract '0.444444444444444'  '-0.555555555555563' -> '1.00000000000001' Inexact Rounded
 430 subx471 subtract '0.444444444444444'  '-0.555555555555562' -> '1.00000000000001' Inexact Rounded
 431 subx472 subtract '0.444444444444444'  '-0.555555555555561' -> '1.00000000000001' Inexact Rounded
 432 subx473 subtract '0.444444444444444'  '-0.555555555555560' -> '1.00000000000000' Inexact Rounded
 433 subx474 subtract '0.444444444444444'  '-0.555555555555559' -> '1.00000000000000' Inexact Rounded
 434 subx475 subtract '0.444444444444444'  '-0.555555555555558' -> '1.00000000000000' Inexact Rounded
 435 subx476 subtract '0.444444444444444'  '-0.555555555555557' -> '1.00000000000000' Inexact Rounded
 436 subx477 subtract '0.444444444444444'  '-0.555555555555556' -> '1.00000000000000' Rounded
 437 subx478 subtract '0.444444444444444'  '-0.555555555555555' -> '0.999999999999999'
 438 subx479 subtract '0.444444444444444'  '-0.555555555555554' -> '0.999999999999998'
 439 subx480 subtract '0.444444444444444'  '-0.555555555555553' -> '0.999999999999997'
 440 subx481 subtract '0.444444444444444'  '-0.555555555555552' -> '0.999999999999996'
 441 subx482 subtract '0.444444444444444'  '-0.555555555555551' -> '0.999999999999995'
 442 subx483 subtract '0.444444444444444'  '-0.555555555555550' -> '0.999999999999994'
 443
 444 -- and some more, including residue effects and different roundings
 445 precision: 9
 446 rounding: half_up
 447 subx500 subtract '123456789' 0             -> '123456789'
 448 subx501 subtract '123456789' 0.000000001   -> '123456789' Inexact Rounded
 449 subx502 subtract '123456789' 0.000001      -> '123456789' Inexact Rounded
 450 subx503 subtract '123456789' 0.1           -> '123456789' Inexact Rounded
 451 subx504 subtract '123456789' 0.4           -> '123456789' Inexact Rounded
 452 subx505 subtract '123456789' 0.49          -> '123456789' Inexact Rounded
 453 subx506 subtract '123456789' 0.499999      -> '123456789' Inexact Rounded
 454 subx507 subtract '123456789' 0.499999999   -> '123456789' Inexact Rounded
 455 subx508 subtract '123456789' 0.5           -> '123456789' Inexact Rounded
 456 subx509 subtract '123456789' 0.500000001   -> '123456788' Inexact Rounded
 457 subx510 subtract '123456789' 0.500001      -> '123456788' Inexact Rounded
 458 subx511 subtract '123456789' 0.51          -> '123456788' Inexact Rounded
 459 subx512 subtract '123456789' 0.6           -> '123456788' Inexact Rounded
 460 subx513 subtract '123456789' 0.9           -> '123456788' Inexact Rounded
 461 subx514 subtract '123456789' 0.99999       -> '123456788' Inexact Rounded
 462 subx515 subtract '123456789' 0.999999999   -> '123456788' Inexact Rounded
 463 subx516 subtract '123456789' 1             -> '123456788'
 464 subx517 subtract '123456789' 1.000000001   -> '123456788' Inexact Rounded
 465 subx518 subtract '123456789' 1.00001       -> '123456788' Inexact Rounded
 466 subx519 subtract '123456789' 1.1           -> '123456788' Inexact Rounded
 467
 468 rounding: half_even
 469 subx520 subtract '123456789' 0             -> '123456789'
 470 subx521 subtract '123456789' 0.000000001   -> '123456789' Inexact Rounded
 471 subx522 subtract '123456789' 0.000001      -> '123456789' Inexact Rounded
 472 subx523 subtract '123456789' 0.1           -> '123456789' Inexact Rounded
 473 subx524 subtract '123456789' 0.4           -> '123456789' Inexact Rounded
 474 subx525 subtract '123456789' 0.49          -> '123456789' Inexact Rounded
 475 subx526 subtract '123456789' 0.499999      -> '123456789' Inexact Rounded
 476 subx527 subtract '123456789' 0.499999999   -> '123456789' Inexact Rounded
 477 subx528 subtract '123456789' 0.5           -> '123456788' Inexact Rounded
 478 subx529 subtract '123456789' 0.500000001   -> '123456788' Inexact Rounded
 479 subx530 subtract '123456789' 0.500001      -> '123456788' Inexact Rounded
 480 subx531 subtract '123456789' 0.51          -> '123456788' Inexact Rounded
 481 subx532 subtract '123456789' 0.6           -> '123456788' Inexact Rounded
 482 subx533 subtract '123456789' 0.9           -> '123456788' Inexact Rounded
 483 subx534 subtract '123456789' 0.99999       -> '123456788' Inexact Rounded
 484 subx535 subtract '123456789' 0.999999999   -> '123456788' Inexact Rounded
 485 subx536 subtract '123456789' 1             -> '123456788'
 486 subx537 subtract '123456789' 1.00000001    -> '123456788' Inexact Rounded
 487 subx538 subtract '123456789' 1.00001       -> '123456788' Inexact Rounded
 488 subx539 subtract '123456789' 1.1           -> '123456788' Inexact Rounded
 489 -- critical few with even bottom digit...
 490 subx540 subtract '123456788' 0.499999999   -> '123456788' Inexact Rounded
 491 subx541 subtract '123456788' 0.5           -> '123456788' Inexact Rounded
 492 subx542 subtract '123456788' 0.500000001   -> '123456787' Inexact Rounded
 493
 494 rounding: down
 495 subx550 subtract '123456789' 0             -> '123456789'
 496 subx551 subtract '123456789' 0.000000001   -> '123456788' Inexact Rounded
 497 subx552 subtract '123456789' 0.000001      -> '123456788' Inexact Rounded
 498 subx553 subtract '123456789' 0.1           -> '123456788' Inexact Rounded
 499 subx554 subtract '123456789' 0.4           -> '123456788' Inexact Rounded
 500 subx555 subtract '123456789' 0.49          -> '123456788' Inexact Rounded
 501 subx556 subtract '123456789' 0.499999      -> '123456788' Inexact Rounded
 502 subx557 subtract '123456789' 0.499999999   -> '123456788' Inexact Rounded
 503 subx558 subtract '123456789' 0.5           -> '123456788' Inexact Rounded
 504 subx559 subtract '123456789' 0.500000001   -> '123456788' Inexact Rounded
 505 subx560 subtract '123456789' 0.500001      -> '123456788' Inexact Rounded
 506 subx561 subtract '123456789' 0.51          -> '123456788' Inexact Rounded
 507 subx562 subtract '123456789' 0.6           -> '123456788' Inexact Rounded
 508 subx563 subtract '123456789' 0.9           -> '123456788' Inexact Rounded
 509 subx564 subtract '123456789' 0.99999       -> '123456788' Inexact Rounded
 510 subx565 subtract '123456789' 0.999999999   -> '123456788' Inexact Rounded
 511 subx566 subtract '123456789' 1             -> '123456788'
 512 subx567 subtract '123456789' 1.00000001    -> '123456787' Inexact Rounded
 513 subx568 subtract '123456789' 1.00001       -> '123456787' Inexact Rounded
 514 subx569 subtract '123456789' 1.1           -> '123456787' Inexact Rounded
 515
 516 -- symmetry...
 517 rounding: half_up
 518 subx600 subtract 0             '123456789' -> '-123456789'
 519 subx601 subtract 0.000000001   '123456789' -> '-123456789' Inexact Rounded
 520 subx602 subtract 0.000001      '123456789' -> '-123456789' Inexact Rounded
 521 subx603 subtract 0.1           '123456789' -> '-123456789' Inexact Rounded
 522 subx604 subtract 0.4           '123456789' -> '-123456789' Inexact Rounded
 523 subx605 subtract 0.49          '123456789' -> '-123456789' Inexact Rounded
 524 subx606 subtract 0.499999      '123456789' -> '-123456789' Inexact Rounded
 525 subx607 subtract 0.499999999   '123456789' -> '-123456789' Inexact Rounded
 526 subx608 subtract 0.5           '123456789' -> '-123456789' Inexact Rounded
 527 subx609 subtract 0.500000001   '123456789' -> '-123456788' Inexact Rounded
 528 subx610 subtract 0.500001      '123456789' -> '-123456788' Inexact Rounded
 529 subx611 subtract 0.51          '123456789' -> '-123456788' Inexact Rounded
 530 subx612 subtract 0.6           '123456789' -> '-123456788' Inexact Rounded
 531 subx613 subtract 0.9           '123456789' -> '-123456788' Inexact Rounded
 532 subx614 subtract 0.99999       '123456789' -> '-123456788' Inexact Rounded
 533 subx615 subtract 0.999999999   '123456789' -> '-123456788' Inexact Rounded
 534 subx616 subtract 1             '123456789' -> '-123456788'
 535 subx617 subtract 1.000000001   '123456789' -> '-123456788' Inexact Rounded
 536 subx618 subtract 1.00001       '123456789' -> '-123456788' Inexact Rounded
 537 subx619 subtract 1.1           '123456789' -> '-123456788' Inexact Rounded
 538
 539 rounding: half_even
 540 subx620 subtract 0             '123456789' -> '-123456789'
 541 subx621 subtract 0.000000001   '123456789' -> '-123456789' Inexact Rounded
 542 subx622 subtract 0.000001      '123456789' -> '-123456789' Inexact Rounded
 543 subx623 subtract 0.1           '123456789' -> '-123456789' Inexact Rounded
 544 subx624 subtract 0.4           '123456789' -> '-123456789' Inexact Rounded
 545 subx625 subtract 0.49          '123456789' -> '-123456789' Inexact Rounded
 546 subx626 subtract 0.499999      '123456789' -> '-123456789' Inexact Rounded
 547 subx627 subtract 0.499999999   '123456789' -> '-123456789' Inexact Rounded
 548 subx628 subtract 0.5           '123456789' -> '-123456788' Inexact Rounded
 549 subx629 subtract 0.500000001   '123456789' -> '-123456788' Inexact Rounded
 550 subx630 subtract 0.500001      '123456789' -> '-123456788' Inexact Rounded
 551 subx631 subtract 0.51          '123456789' -> '-123456788' Inexact Rounded
 552 subx632 subtract 0.6           '123456789' -> '-123456788' Inexact Rounded
 553 subx633 subtract 0.9           '123456789' -> '-123456788' Inexact Rounded
 554 subx634 subtract 0.99999       '123456789' -> '-123456788' Inexact Rounded
 555 subx635 subtract 0.999999999   '123456789' -> '-123456788' Inexact Rounded
 556 subx636 subtract 1             '123456789' -> '-123456788'
 557 subx637 subtract 1.00000001    '123456789' -> '-123456788' Inexact Rounded
 558 subx638 subtract 1.00001       '123456789' -> '-123456788' Inexact Rounded
 559 subx639 subtract 1.1           '123456789' -> '-123456788' Inexact Rounded
 560 -- critical few with even bottom digit...
 561 subx640 subtract 0.499999999   '123456788' -> '-123456788' Inexact Rounded
 562 subx641 subtract 0.5           '123456788' -> '-123456788' Inexact Rounded
 563 subx642 subtract 0.500000001   '123456788' -> '-123456787' Inexact Rounded
 564
 565 rounding: down
 566 subx650 subtract 0             '123456789' -> '-123456789'
 567 subx651 subtract 0.000000001   '123456789' -> '-123456788' Inexact Rounded
 568 subx652 subtract 0.000001      '123456789' -> '-123456788' Inexact Rounded
 569 subx653 subtract 0.1           '123456789' -> '-123456788' Inexact Rounded
 570 subx654 subtract 0.4           '123456789' -> '-123456788' Inexact Rounded
 571 subx655 subtract 0.49          '123456789' -> '-123456788' Inexact Rounded
 572 subx656 subtract 0.499999      '123456789' -> '-123456788' Inexact Rounded
 573 subx657 subtract 0.499999999   '123456789' -> '-123456788' Inexact Rounded
 574 subx658 subtract 0.5           '123456789' -> '-123456788' Inexact Rounded
 575 subx659 subtract 0.500000001   '123456789' -> '-123456788' Inexact Rounded
 576 subx660 subtract 0.500001      '123456789' -> '-123456788' Inexact Rounded
 577 subx661 subtract 0.51          '123456789' -> '-123456788' Inexact Rounded
 578 subx662 subtract 0.6           '123456789' -> '-123456788' Inexact Rounded
 579 subx663 subtract 0.9           '123456789' -> '-123456788' Inexact Rounded
 580 subx664 subtract 0.99999       '123456789' -> '-123456788' Inexact Rounded
 581 subx665 subtract 0.999999999   '123456789' -> '-123456788' Inexact Rounded
 582 subx666 subtract 1             '123456789' -> '-123456788'
 583 subx667 subtract 1.00000001    '123456789' -> '-123456787' Inexact Rounded
 584 subx668 subtract 1.00001       '123456789' -> '-123456787' Inexact Rounded
 585 subx669 subtract 1.1           '123456789' -> '-123456787' Inexact Rounded
 586
 587
 588 -- lots of leading zeros in intermediate result, and showing effects of
 589 -- input rounding would have affected the following
 590 precision: 9
 591 rounding: half_up
 592 subx670 subtract '123456789' '123456788.1' -> 0.9
 593 subx671 subtract '123456789' '123456788.9' -> 0.1
 594 subx672 subtract '123456789' '123456789.1' -> -0.1
 595 subx673 subtract '123456789' '123456789.5' -> -0.5
 596 subx674 subtract '123456789' '123456789.9' -> -0.9
 597
 598 rounding: half_even
 599 subx680 subtract '123456789' '123456788.1' -> 0.9
 600 subx681 subtract '123456789' '123456788.9' -> 0.1
 601 subx682 subtract '123456789' '123456789.1' -> -0.1
 602 subx683 subtract '123456789' '123456789.5' -> -0.5
 603 subx684 subtract '123456789' '123456789.9' -> -0.9
 604
 605 subx685 subtract '123456788' '123456787.1' -> 0.9
 606 subx686 subtract '123456788' '123456787.9' -> 0.1
 607 subx687 subtract '123456788' '123456788.1' -> -0.1
 608 subx688 subtract '123456788' '123456788.5' -> -0.5
 609 subx689 subtract '123456788' '123456788.9' -> -0.9
 610
 611 rounding: down
 612 subx690 subtract '123456789' '123456788.1' -> 0.9
 613 subx691 subtract '123456789' '123456788.9' -> 0.1
 614 subx692 subtract '123456789' '123456789.1' -> -0.1
 615 subx693 subtract '123456789' '123456789.5' -> -0.5
 616 subx694 subtract '123456789' '123456789.9' -> -0.9
 617
 618 -- input preparation tests
 619 rounding: half_up
 620 precision: 3
 621
 622 subx700 subtract '12345678900000'  -9999999999999 ->  '2.23E+13' Inexact Rounded
 623 subx701 subtract  '9999999999999' -12345678900000 ->  '2.23E+13' Inexact Rounded
 624 subx702 subtract '12E+3'  '-3456' ->  '1.55E+4' Inexact Rounded
 625 subx703 subtract '12E+3'  '-3446' ->  '1.54E+4' Inexact Rounded
 626 subx704 subtract '12E+3'  '-3454' ->  '1.55E+4' Inexact Rounded
 627 subx705 subtract '12E+3'  '-3444' ->  '1.54E+4' Inexact Rounded
 628
 629 subx706 subtract '3456'  '-12E+3' ->  '1.55E+4' Inexact Rounded
 630 subx707 subtract '3446'  '-12E+3' ->  '1.54E+4' Inexact Rounded
 631 subx708 subtract '3454'  '-12E+3' ->  '1.55E+4' Inexact Rounded
 632 subx709 subtract '3444'  '-12E+3' ->  '1.54E+4' Inexact Rounded
 633
 634 -- overflow and underflow tests [subnormals now possible]
 635 maxexponent: 999999999
 636 minexponent: -999999999
 637 precision: 9
 638 rounding: down
 639 subx710 subtract 1E+999999999    -9E+999999999   -> 9.99999999E+999999999 Overflow Inexact Rounded
 640 subx711 subtract 9E+999999999    -1E+999999999   -> 9.99999999E+999999999 Overflow Inexact Rounded
 641 rounding: half_up
 642 subx712 subtract 1E+999999999    -9E+999999999   -> Infinity Overflow Inexact Rounded
 643 subx713 subtract 9E+999999999    -1E+999999999   -> Infinity Overflow Inexact Rounded
 644 subx714 subtract -1.1E-999999999 -1E-999999999   -> -1E-1000000000 Subnormal
 645 subx715 subtract 1E-999999999    +1.1e-999999999 -> -1E-1000000000 Subnormal
 646 subx716 subtract -1E+999999999   +9E+999999999   -> -Infinity Overflow Inexact Rounded
 647 subx717 subtract -9E+999999999   +1E+999999999   -> -Infinity Overflow Inexact Rounded
 648 subx718 subtract +1.1E-999999999 +1E-999999999   -> 1E-1000000000 Subnormal
 649 subx719 subtract -1E-999999999   -1.1e-999999999 -> 1E-1000000000 Subnormal
 650
 651 precision: 3
 652 subx720 subtract 1  9.999E+999999999   -> -Infinity Inexact Overflow Rounded
 653 subx721 subtract 1 -9.999E+999999999   ->  Infinity Inexact Overflow Rounded
 654 subx722 subtract    9.999E+999999999 1 ->  Infinity Inexact Overflow Rounded
 655 subx723 subtract   -9.999E+999999999 1 -> -Infinity Inexact Overflow Rounded
 656 subx724 subtract 1  9.999E+999999999   -> -Infinity Inexact Overflow Rounded
 657 subx725 subtract 1 -9.999E+999999999   ->  Infinity Inexact Overflow Rounded
 658 subx726 subtract    9.999E+999999999 1 ->  Infinity Inexact Overflow Rounded
 659 subx727 subtract   -9.999E+999999999 1 -> -Infinity Inexact Overflow Rounded
 660
 661 -- [more below]
 662
 663 -- long operand checks
 664 maxexponent: 999
 665 minexponent: -999
 666 precision: 9
 667 sub731 subtract 12345678000 0 ->  1.23456780E+10 Rounded
 668 sub732 subtract 0 12345678000 -> -1.23456780E+10 Rounded
 669 sub733 subtract 1234567800  0 ->  1.23456780E+9 Rounded
 670 sub734 subtract 0 1234567800  -> -1.23456780E+9 Rounded
 671 sub735 subtract 1234567890  0 ->  1.23456789E+9 Rounded
 672 sub736 subtract 0 1234567890  -> -1.23456789E+9 Rounded
 673 sub737 subtract 1234567891  0 ->  1.23456789E+9 Inexact Rounded
 674 sub738 subtract 0 1234567891  -> -1.23456789E+9 Inexact Rounded
 675 sub739 subtract 12345678901 0 ->  1.23456789E+10 Inexact Rounded
 676 sub740 subtract 0 12345678901 -> -1.23456789E+10 Inexact Rounded
 677 sub741 subtract 1234567896  0 ->  1.23456790E+9 Inexact Rounded
 678 sub742 subtract 0 1234567896  -> -1.23456790E+9 Inexact Rounded
 679
 680 precision: 15
 681 sub751 subtract 12345678000 0 ->  12345678000
 682 sub752 subtract 0 12345678000 -> -12345678000
 683 sub753 subtract 1234567800  0 ->  1234567800
 684 sub754 subtract 0 1234567800  -> -1234567800
 685 sub755 subtract 1234567890  0 ->  1234567890
 686 sub756 subtract 0 1234567890  -> -1234567890
 687 sub757 subtract 1234567891  0 ->  1234567891
 688 sub758 subtract 0 1234567891  -> -1234567891
 689 sub759 subtract 12345678901 0 ->  12345678901
 690 sub760 subtract 0 12345678901 -> -12345678901
 691 sub761 subtract 1234567896  0 ->  1234567896
 692 sub762 subtract 0 1234567896  -> -1234567896
 693
 694 -- Specials
 695 subx780 subtract -Inf   Inf   -> -Infinity
 696 subx781 subtract -Inf   1000  -> -Infinity
 697 subx782 subtract -Inf   1     -> -Infinity
 698 subx783 subtract -Inf  -0     -> -Infinity
 699 subx784 subtract -Inf  -1     -> -Infinity
 700 subx785 subtract -Inf  -1000  -> -Infinity
 701 subx787 subtract -1000  Inf   -> -Infinity
 702 subx788 subtract -Inf   Inf   -> -Infinity
 703 subx789 subtract -1     Inf   -> -Infinity
 704 subx790 subtract  0     Inf   -> -Infinity
 705 subx791 subtract  1     Inf   -> -Infinity
 706 subx792 subtract  1000  Inf   -> -Infinity
 707
 708 subx800 subtract  Inf   Inf   ->  NaN  Invalid_operation
 709 subx801 subtract  Inf   1000  ->  Infinity
 710 subx802 subtract  Inf   1     ->  Infinity
 711 subx803 subtract  Inf   0     ->  Infinity
 712 subx804 subtract  Inf  -0     ->  Infinity
 713 subx805 subtract  Inf  -1     ->  Infinity
 714 subx806 subtract  Inf  -1000  ->  Infinity
 715 subx807 subtract  Inf  -Inf   ->  Infinity
 716 subx808 subtract -1000 -Inf   ->  Infinity
 717 subx809 subtract -Inf  -Inf   ->  NaN  Invalid_operation
 718 subx810 subtract -1    -Inf   ->  Infinity
 719 subx811 subtract -0    -Inf   ->  Infinity
 720 subx812 subtract  0    -Inf   ->  Infinity
 721 subx813 subtract  1    -Inf   ->  Infinity
 722 subx814 subtract  1000 -Inf   ->  Infinity
 723 subx815 subtract  Inf  -Inf   ->  Infinity
 724
 725 subx821 subtract  NaN   Inf   ->  NaN
 726 subx822 subtract -NaN   1000  -> -NaN
 727 subx823 subtract  NaN   1     ->  NaN
 728 subx824 subtract  NaN   0     ->  NaN
 729 subx825 subtract  NaN  -0     ->  NaN
 730 subx826 subtract  NaN  -1     ->  NaN
 731 subx827 subtract  NaN  -1000  ->  NaN
 732 subx828 subtract  NaN  -Inf   ->  NaN
 733 subx829 subtract -NaN   NaN   -> -NaN
 734 subx830 subtract -Inf   NaN   ->  NaN
 735 subx831 subtract -1000  NaN   ->  NaN
 736 subx832 subtract -1     NaN   ->  NaN
 737 subx833 subtract -0     NaN   ->  NaN
 738 subx834 subtract  0     NaN   ->  NaN
 739 subx835 subtract  1     NaN   ->  NaN
 740 subx836 subtract  1000 -NaN   -> -NaN
 741 subx837 subtract  Inf   NaN   ->  NaN
 742
 743 subx841 subtract  sNaN  Inf   ->  NaN  Invalid_operation
 744 subx842 subtract -sNaN  1000  -> -NaN  Invalid_operation
 745 subx843 subtract  sNaN  1     ->  NaN  Invalid_operation
 746 subx844 subtract  sNaN  0     ->  NaN  Invalid_operation
 747 subx845 subtract  sNaN -0     ->  NaN  Invalid_operation
 748 subx846 subtract  sNaN -1     ->  NaN  Invalid_operation
 749 subx847 subtract  sNaN -1000  ->  NaN  Invalid_operation
 750 subx848 subtract  sNaN  NaN   ->  NaN  Invalid_operation
 751 subx849 subtract  sNaN sNaN   ->  NaN  Invalid_operation
 752 subx850 subtract  NaN  sNaN   ->  NaN  Invalid_operation
 753 subx851 subtract -Inf -sNaN   -> -NaN  Invalid_operation
 754 subx852 subtract -1000 sNaN   ->  NaN  Invalid_operation
 755 subx853 subtract -1    sNaN   ->  NaN  Invalid_operation
 756 subx854 subtract -0    sNaN   ->  NaN  Invalid_operation
 757 subx855 subtract  0    sNaN   ->  NaN  Invalid_operation
 758 subx856 subtract  1    sNaN   ->  NaN  Invalid_operation
 759 subx857 subtract  1000 sNaN   ->  NaN  Invalid_operation
 760 subx858 subtract  Inf  sNaN   ->  NaN  Invalid_operation
 761 subx859 subtract  NaN  sNaN   ->  NaN  Invalid_operation
 762
 763 -- propagating NaNs
 764 subx861 subtract  NaN01   -Inf     ->  NaN1
 765 subx862 subtract -NaN02   -1000    -> -NaN2
 766 subx863 subtract  NaN03    1000    ->  NaN3
 767 subx864 subtract  NaN04    Inf     ->  NaN4
 768 subx865 subtract  NaN05    NaN61   ->  NaN5
 769 subx866 subtract -Inf     -NaN71   -> -NaN71
 770 subx867 subtract -1000     NaN81   ->  NaN81
 771 subx868 subtract  1000     NaN91   ->  NaN91
 772 subx869 subtract  Inf      NaN101  ->  NaN101
 773 subx871 subtract  sNaN011  -Inf    ->  NaN11  Invalid_operation
 774 subx872 subtract  sNaN012  -1000   ->  NaN12  Invalid_operation
 775 subx873 subtract -sNaN013   1000   -> -NaN13  Invalid_operation
 776 subx874 subtract  sNaN014   NaN171 ->  NaN14  Invalid_operation
 777 subx875 subtract  sNaN015  sNaN181 ->  NaN15  Invalid_operation
 778 subx876 subtract  NaN016   sNaN191 ->  NaN191 Invalid_operation
 779 subx877 subtract -Inf      sNaN201 ->  NaN201 Invalid_operation
 780 subx878 subtract -1000     sNaN211 ->  NaN211 Invalid_operation
 781 subx879 subtract  1000    -sNaN221 -> -NaN221 Invalid_operation
 782 subx880 subtract  Inf      sNaN231 ->  NaN231 Invalid_operation
 783 subx881 subtract  NaN025   sNaN241 ->  NaN241 Invalid_operation
 784
 785 -- edge case spills
 786 subx901 subtract  2.E-3  1.002  -> -1.000
 787 subx902 subtract  2.0E-3  1.002  -> -1.0000
 788 subx903 subtract  2.00E-3  1.0020  -> -1.00000
 789 subx904 subtract  2.000E-3  1.00200  -> -1.000000
 790 subx905 subtract  2.0000E-3  1.002000  -> -1.0000000
 791 subx906 subtract  2.00000E-3  1.0020000  -> -1.00000000
 792 subx907 subtract  2.000000E-3  1.00200000  -> -1.000000000
 793 subx908 subtract  2.0000000E-3  1.002000000  -> -1.0000000000
 794
 795 -- subnormals and underflows
 796 precision: 3
 797 maxexponent: 999
 798 minexponent: -999
 799 subx1010 subtract  0  1.00E-999       ->  -1.00E-999
 800 subx1011 subtract  0  0.1E-999        ->  -1E-1000   Subnormal
 801 subx1012 subtract  0  0.10E-999       ->  -1.0E-1000 Subnormal
 802 subx1013 subtract  0  0.100E-999      ->  -1.0E-1000 Subnormal Rounded
 803 subx1014 subtract  0  0.01E-999       ->  -1E-1001   Subnormal
 804 -- next is rounded to Emin
 805 subx1015 subtract  0  0.999E-999      ->  -1.00E-999 Inexact Rounded Subnormal Underflow
 806 subx1016 subtract  0  0.099E-999      ->  -1.0E-1000 Inexact Rounded Subnormal Underflow
 807 subx1017 subtract  0  0.009E-999      ->  -1E-1001   Inexact Rounded Subnormal Underflow
 808 subx1018 subtract  0  0.001E-999      ->  -0E-1001   Inexact Rounded Subnormal Underflow Clamped
 809 subx1019 subtract  0  0.0009E-999     ->  -0E-1001   Inexact Rounded Subnormal Underflow Clamped
 810 subx1020 subtract  0  0.0001E-999     ->  -0E-1001   Inexact Rounded Subnormal Underflow Clamped
 811
 812 subx1030 subtract  0 -1.00E-999       ->   1.00E-999
 813 subx1031 subtract  0 -0.1E-999        ->   1E-1000   Subnormal
 814 subx1032 subtract  0 -0.10E-999       ->   1.0E-1000 Subnormal
 815 subx1033 subtract  0 -0.100E-999      ->   1.0E-1000 Subnormal Rounded
 816 subx1034 subtract  0 -0.01E-999       ->   1E-1001   Subnormal
 817 -- next is rounded to Emin
 818 subx1035 subtract  0 -0.999E-999      ->   1.00E-999 Inexact Rounded Subnormal Underflow
 819 subx1036 subtract  0 -0.099E-999      ->   1.0E-1000 Inexact Rounded Subnormal Underflow
 820 subx1037 subtract  0 -0.009E-999      ->   1E-1001   Inexact Rounded Subnormal Underflow
 821 subx1038 subtract  0 -0.001E-999      ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
 822 subx1039 subtract  0 -0.0009E-999     ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
 823 subx1040 subtract  0 -0.0001E-999     ->   0E-1001   Inexact Rounded Subnormal Underflow Clamped
 824
 825 -- some non-zero subnormal subtracts
 826 -- subx1056 is a tricky case
 827 rounding: half_up
 828 subx1050 subtract  1.00E-999   0.1E-999  ->   9.0E-1000  Subnormal
 829 subx1051 subtract  0.1E-999    0.1E-999  ->   0E-1000
 830 subx1052 subtract  0.10E-999   0.1E-999  ->   0E-1001
 831 subx1053 subtract  0.100E-999  0.1E-999  ->   0E-1001    Clamped
 832 subx1054 subtract  0.01E-999   0.1E-999  ->   -9E-1001   Subnormal
 833 subx1055 subtract  0.999E-999  0.1E-999  ->   9.0E-1000  Inexact Rounded Subnormal Underflow
 834 subx1056 subtract  0.099E-999  0.1E-999  ->   -0E-1001   Inexact Rounded Subnormal Underflow Clamped
 835 subx1057 subtract  0.009E-999  0.1E-999  ->   -9E-1001   Inexact Rounded Subnormal Underflow
 836 subx1058 subtract  0.001E-999  0.1E-999  ->   -1.0E-1000 Inexact Rounded Subnormal Underflow
 837 subx1059 subtract  0.0009E-999 0.1E-999  ->   -1.0E-1000 Inexact Rounded Subnormal Underflow
 838 subx1060 subtract  0.0001E-999 0.1E-999  ->   -1.0E-1000 Inexact Rounded Subnormal Underflow
 839
 840
 841 -- check for double-rounded subnormals
 842 precision:   5
 843 maxexponent: 79
 844 minexponent: -79
 845 subx1101 subtract  0 1.52444E-80 -> -1.524E-80 Inexact Rounded Subnormal Underflow
 846 subx1102 subtract  0 1.52445E-80 -> -1.524E-80 Inexact Rounded Subnormal Underflow
 847 subx1103 subtract  0 1.52446E-80 -> -1.524E-80 Inexact Rounded Subnormal Underflow
 848 subx1104 subtract  1.52444E-80 0 ->  1.524E-80 Inexact Rounded Subnormal Underflow
 849 subx1105 subtract  1.52445E-80 0 ->  1.524E-80 Inexact Rounded Subnormal Underflow
 850 subx1106 subtract  1.52446E-80 0 ->  1.524E-80 Inexact Rounded Subnormal Underflow
 851
 852 subx1111 subtract  1.2345678E-80  1.2345671E-80 ->  0E-83 Inexact Rounded Subnormal Underflow Clamped
 853 subx1112 subtract  1.2345678E-80  1.2345618E-80 ->  0E-83 Inexact Rounded Subnormal Underflow Clamped
 854 subx1113 subtract  1.2345678E-80  1.2345178E-80 ->  0E-83 Inexact Rounded Subnormal Underflow Clamped
 855 subx1114 subtract  1.2345678E-80  1.2341678E-80 ->  0E-83 Inexact Rounded Subnormal Underflow Clamped
 856 subx1115 subtract  1.2345678E-80  1.2315678E-80 ->  3E-83         Rounded Subnormal
 857 subx1116 subtract  1.2345678E-80  1.2145678E-80 ->  2.0E-82       Rounded Subnormal
 858 subx1117 subtract  1.2345678E-80  1.1345678E-80 ->  1.00E-81      Rounded Subnormal
 859 subx1118 subtract  1.2345678E-80  0.2345678E-80 ->  1.000E-80     Rounded Subnormal
 860
 861 precision:   34
 862 rounding:    half_up
 863 maxExponent: 6144
 864 minExponent: -6143
 865 -- Examples from SQL proposal (Krishna Kulkarni)
 866 subx1125  subtract 130E-2  120E-2 -> 0.10
 867 subx1126  subtract 130E-2  12E-1  -> 0.10
 868 subx1127  subtract 130E-2  1E0    -> 0.30
 869 subx1128  subtract 1E2     1E4    -> -9.9E+3
 870
 871 -- Null tests
 872 subx9990 subtract 10  # -> NaN Invalid_operation
 873 subx9991 subtract  # 10 -> NaN Invalid_operation