1 dnl PSPP - a program for statistical analysis.
2 dnl Copyright (C) 2017 Free Software Foundation, Inc.
4 dnl This program is free software: you can redistribute it and/or modify
5 dnl it under the terms of the GNU General Public License as published by
6 dnl the Free Software Foundation, either version 3 of the License, or
7 dnl (at your option) any later version.
9 dnl This program is distributed in the hope that it will be useful,
10 dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
11 dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 dnl GNU General Public License for more details.
14 dnl You should have received a copy of the GNU General Public License
15 dnl along with this program. If not, see <http://www.gnu.org/licenses/>.
17 AT_BANNER([floating point formats])
19 AT_SETUP([floating point format conversions])
20 AT_DATA([float-format.txt], [dnl
21 # Each of the tests below checks that conversion between
22 # floating-point formats works correctly. Comparisons that use ==
23 # require that conversion from any format on the line to any other
24 # format on the line work losslessly. Comparisons that use => only
25 # check that conversions work losslessly in the given direction.
27 # Key to format names:
28 # isl: IEEE single-precision, little endian
29 # isb: IEEE single-precision, big endian
30 # idl: IEEE double-precision, little endian
31 # idb: IEEE double-precision, big endian
35 # zs: Z architecture short
36 # zl: Z architecture long
37 # x: hexadecimal digits
39 # IEEE special values.
41 x('Infinity') == isb('7f800000')
42 x('-Infinity') == isb('ff800000')
43 x('NaN:') => isb('7f800001') # NaN requires nonzero fraction.
44 x('NaN:e000000000000000') == isb('7ff00000') == idb('7ffe000000000000')
45 x('NaN:5a5a5e0000000000') == isb('7fad2d2f') == idb('7ff5a5a5e0000000')
46 x('NaN:975612abcdef4000') == idb('7ff975612abcdef4')
47 x('-NaN:e000000000000000') == isb('fff00000') == idb('fffe000000000000')
48 x('-NaN:5a5a5e0000000000') == isb('ffad2d2f') == idb('fff5a5a5e0000000')
49 x('-NaN:975612abcdef4000') == idb('fff975612abcdef4')
51 # PSPP special values.
52 x('Missing') == isb('ff7fffff') == idb('ffefffffffffffff') == isl('ffff7fff') == idl('ffffffffffffefff') == vf('ffffffff') == vd('ffffffffffffffff') == vg('ffffffffffffffff') == zs('ffffffff') == zl('ffffffffffffffff')
53 x('Lowest') == isb('ff7ffffe') == idb('ffeffffffffffffe') == isl('feff7fff') == idl('feffffffffffefff') == vf('fffffeff') == vd('fffffeffffffffff') == vg('fffffeffffffffff') == zs('fffffffe') == zl('fffffffffffffffe')
54 x('Highest') == isb('7f7fffff') == idb('7fefffffffffffff') == isl('ffff7f7f') == idl('ffffffffffffef7f') == vf('ff7fffff') == vd('ffffffffff7fffff') == vg('ffffffffff7fffff') == zs('7fffffff') == zl('7fffffffffffffff')
57 0.15625 == isb('3e200000')
58 -118.625 == isb('c2ed4000')
60 # http://www.psc.edu/general/software/packages/ieee/ieee.html
61 x('NaN:0400000000000000') == isb('7f820000')
62 x('-NaN:2225540000000000') == isb('ff9112aa')
64 6.5 == isb('40d00000')
65 -6.5 == isb('c0d00000')
66 x('.4p-124') == isb('00800000')
67 x('.2p-124') == isb('00400000')
69 # Using converter at http://babbage.cs.qc.edu/IEEE-754/Decimal.html
70 # plus Emacs 'calc' to convert decimal to hexadecimal
71 x('.7b74bc6a7ef9db23p8') => isb('42f6e979') # 123.456
72 x('.7b74bc6a7ef9db23p8') => idb('405edd2f1a9fbe77')
73 x('.817427d2d4642004p-12') => isb('39017428') # .0001234567
74 x('.817427d2d4642004p-12') => idb('3f202e84fa5a8c84')
75 x('.446c3b15f9926688p168') => isb('7f800000') # 1e50; overflow
76 x('.446c3b15f9926688p168') => idb('4a511b0ec57e649a')
78 # From multiple editions of the z/Architecture Principles of Operation
80 1.0 == zs('41100000') == isb('3f800000')
81 0.5 == zs('40800000') == isb('3f000000')
82 x('.4p-4') == zs('3f400000') == isb('3c800000')
83 0 == zs('00000000') == isb('00000000')
84 zs('80000000') == isb('80000000')
85 -15 == zs('c1f00000') == isb('c1700000')
86 # x('.ffffffp252') == zs('7fffffff')
87 x('.3b4p8') == zs('423b4000')
88 x('.1p-256') == zs('00100000')
89 x('.4p-124') == zs('21400000') == isb('00800000')
90 x('.8p-148') == zs('1b800000') == isb('00000001')
91 # x('.ffffffp128') == zs('60ffffff') == isb('7f7fffff')
92 x('.1p-256') == zs('00100000')
93 x('.1p-256') => isb('00000000') # Underflow to zero.
94 x('.ffffffp248') == zs('7effffff')
95 x('.ffffffp248') => isb('7f800000') # Overflow to +Infinity.
97 x('.4p-1020') => zl('0000000000000000') # Underflow to zero.
98 x('.4p-1020') == idb('0010000000000000')
99 x('.4p-1072') => zl('0000000000000000') # Underflow to zero.
100 x('.4p-1072') => idb('0000000000000001')
101 x('.fffffffffffff8p1024') => zl('7fffffffffffffff') # Overflow to maxval.
102 x('.fffffffffffff8p1024') => idb('7fefffffffffffff')
103 x('.1p-256') == zl('0010000000000000') == idb('2fb0000000000000')
104 x('.ffffffffffffffp248') == zl('7effffffffffffff')
105 x('.ffffffffffffffp248') => idb('4f70000000000000') # Loses precision.
112 s/^\(..*\)$/DEBUG FLOAT FORMAT \1./' < float-format.txt > float-format.sps])
113 AT_CHECK([pspp --testing-mode -O format=csv float-format.sps])